#quantummechanics — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #quantummechanics, aggregated by home.social.
-
Put together a sourced timeline: AI and Quantum Computing: The Complete History and Roadmap.
https://aitimeline.in/artificial-intelligence-quantum-computing-timeline-3550/?utm_source=mastodon&utm_medium=social&utm_campaign=artificial-intelligence-quantum
#AI #QuantumComputing #MachineLearning #DeepLearning #QuantumMechanics #Superposition -
Put together a sourced timeline: AI and Quantum Computing: The Complete History and Roadmap.
https://aitimeline.in/artificial-intelligence-quantum-computing-timeline-3550/?utm_source=mastodon&utm_medium=social&utm_campaign=artificial-intelligence-quantum
#AI #QuantumComputing #MachineLearning #DeepLearning #QuantumMechanics #Superposition -
Researchers image molecular orbitals in 3D using advanced techniques
📰 Original title: Molecular orbitals imaged in 3D, opening path to femtosecond videos
🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️View full AI summary https://en.killbait.com/researchers-image-molecular-orbitals-in-3d-using-advanced-techniques.html?utm_source=mastodon_world&utm_medium=social&utm_campaign=killbait.mastodon_world
#science #molecularorbitals #quantummechanics #femtosecondimaging
-
How to image a #wavefunction?
Fundamental particles, such as electrons, cannot be pinned down to one single location. Instead, a particle is described by its “wavefunction” – but imaging the wavefunction is a major challenge. Researchers @ our Uni managed to image the 3D wavefunction of a nanometer-sized organic molecule by combining state-of-the-art photoelectron spectroscopy with powerful mathematical algorithms: https://www.uni-goettingen.de/en/3240.html?id=8252
Research in #NatureCommunications: https://doi.org/10.1038/s41467-026-74308-1
-
How to image a #wavefunction?
Fundamental particles, such as electrons, cannot be pinned down to one single location. Instead, a particle is described by its “wavefunction” – but imaging the wavefunction is a major challenge. Researchers @ our Uni managed to image the 3D wavefunction of a nanometer-sized organic molecule by combining state-of-the-art photoelectron spectroscopy with powerful mathematical algorithms: https://www.uni-goettingen.de/en/3240.html?id=8252
Research in #NatureCommunications: https://doi.org/10.1038/s41467-026-74308-1
-
This technique captures and maps the complete three-dimensional wavefunctions, or molecular orbitals, of a nanometer-sized organic molecule. It provides a visual mathematical map of an electron's probability distribution regarding its specific position and momentum.
#QuantumMechanics #MolecularPhysics #PhysicalChemistry #sflorg
https://www.sflorg.com/2026/08/qs08042601.html -
This technique captures and maps the complete three-dimensional wavefunctions, or molecular orbitals, of a nanometer-sized organic molecule. It provides a visual mathematical map of an electron's probability distribution regarding its specific position and momentum.
#QuantumMechanics #MolecularPhysics #PhysicalChemistry #sflorg
https://www.sflorg.com/2026/08/qs08042601.html -
АНТРОПОЛОГИЯ, ANTHROPOLOGY, АНТРОПОЛОГІЯ
#АНТРОПОЛОГИЯ, #ANTHROPOLOGY, #АНТРОПОЛОГІЯ
t.me/scilib_yura15cbx/542Thermodynamics, statistical physics
Термодинамика, статистическая физика
Термодинаміка, статистична фізика
#Thermodynamics, #statistical physics
#Термодинамика, #статистическаяфизика
#Термодинаміка, #статистичнафізика
t.me/scilib_yura15cbx/541PQm Quantum mechanics
Квантовая механика
Квантова механіка
#Quantum mechanics
#Квантоваямеханика
#Квантовамеханіка
t.me/scilib_yura15cbx/540PQft Quantum field theory
Квантовая теория поля
Квантова теорія поля
#Quantum field theory
t.me/scilib_yura15cbx/539Фазовые переходы
Phase_transitions, Фазовіпереходи
#Фазовые переходы
#Phase transitions, #Фазовіпереходи
t.me/scilib_yura15cbx/538Пиротехника, Піротехніка, Pyrotechnics
#Пиротехника, #Піротехніка, #Pyrotechnics
t.me/scilib_yura15cbx/537Астрономия, Астрономія, Astronomy
#Астрономия, #Астрономія, #Astronomy
t.me/scilib_yura15cbx/536PPop Popular-level
Популярная физика
Популярна Фізика
t.me/scilib_yura15cbx/535PG General courses
Общие курсы
Загальні курси
t.me/scilib_yura15cbx/534PPl Plasma Плазма
Физика плазмы
#Plasma #Плазма
#Физика плазмы
t.me/scilib_yura15cbx/533PPh Philosophy of Physics
Философия физики,
Філософія фізики
t.me/scilib_yura15cbx/532POs Oscillations and waves
Колебания и волны
Коливання і хвилі
t.me/scilib_yura15cbx/531PNu Nuclear Physics
Ядерна фізика
Ядерная физика
#Nuclear Physics
#Ядернафізика
#Ядернаяфизика
t.me/scilib_yura15cbx/530PNc Nonlinear chaos
Нелинейный хаос
Нелінійний хаос
#Nonlinear chaos
#Нелинейныйхаос
#Нелінійнийхаос
t.me/scilib_yura15cbx/529PM Atomic Molecular and Optical Physics
Атомна молекулярна та оптична Фізика
Атомная молекулярная и оптическая физика
t.me/scilib_yura15cbx/528PGrc Cosmology
Космология
Космологія
#Cosmology
#Космология
#Космологія
t.me/scilib_yura15cbx/527PGr Gravitation
Гравитация
Гравітація
#Gravitation
#Гравитация
#Гравітація
t.me/scilib_yura15cbx/526PGe Encyclopaediae physics
Енциклопедія
Энциклопедии
t.me/scilib_yura15cbx/525PE Electromagnetism
Електромагнетизм
Электромагнетизм
#Electromagnetism
#Електромагнетизм
#Электромагнетизм
t.me/scilib_yura15cbx/523PD Dynamical systems
Динамические системы
Динамічна система
t.me/scilib_yura15cbx/522PCh Chemical physics
Хімічна фізика
Химическая физика
#Chemical physics
#Хімічнафізика
#Химическаяфизика
t.me/scilib_yura15cbx/521PCtm Theoretical mechanics
Теоретическая механика
Теоретична механіка
t.me/scilib_yura15cbx/520PCstr Special relativity
Спеціальна теорія відносності
Специальная теория относительности
t.me/scilib_yura15cbx/519PCft Classical fields
Классические поля, классическая теория поля, класична теорія поля
t.me/scilib_yura15cbx/518 -
АНТРОПОЛОГИЯ, ANTHROPOLOGY, АНТРОПОЛОГІЯ
#АНТРОПОЛОГИЯ, #ANTHROPOLOGY, #АНТРОПОЛОГІЯ
t.me/scilib_yura15cbx/542Thermodynamics, statistical physics
Термодинамика, статистическая физика
Термодинаміка, статистична фізика
#Thermodynamics, #statistical physics
#Термодинамика, #статистическаяфизика
#Термодинаміка, #статистичнафізика
t.me/scilib_yura15cbx/541PQm Quantum mechanics
Квантовая механика
Квантова механіка
#Quantum mechanics
#Квантоваямеханика
#Квантовамеханіка
t.me/scilib_yura15cbx/540PQft Quantum field theory
Квантовая теория поля
Квантова теорія поля
#Quantum field theory
t.me/scilib_yura15cbx/539Фазовые переходы
Phase_transitions, Фазовіпереходи
#Фазовые переходы
#Phase transitions, #Фазовіпереходи
t.me/scilib_yura15cbx/538Пиротехника, Піротехніка, Pyrotechnics
#Пиротехника, #Піротехніка, #Pyrotechnics
t.me/scilib_yura15cbx/537Астрономия, Астрономія, Astronomy
#Астрономия, #Астрономія, #Astronomy
t.me/scilib_yura15cbx/536PPop Popular-level
Популярная физика
Популярна Фізика
t.me/scilib_yura15cbx/535PG General courses
Общие курсы
Загальні курси
t.me/scilib_yura15cbx/534PPl Plasma Плазма
Физика плазмы
#Plasma #Плазма
#Физика плазмы
t.me/scilib_yura15cbx/533PPh Philosophy of Physics
Философия физики,
Філософія фізики
t.me/scilib_yura15cbx/532POs Oscillations and waves
Колебания и волны
Коливання і хвилі
t.me/scilib_yura15cbx/531PNu Nuclear Physics
Ядерна фізика
Ядерная физика
#Nuclear Physics
#Ядернафізика
#Ядернаяфизика
t.me/scilib_yura15cbx/530PNc Nonlinear chaos
Нелинейный хаос
Нелінійний хаос
#Nonlinear chaos
#Нелинейныйхаос
#Нелінійнийхаос
t.me/scilib_yura15cbx/529PM Atomic Molecular and Optical Physics
Атомна молекулярна та оптична Фізика
Атомная молекулярная и оптическая физика
t.me/scilib_yura15cbx/528PGrc Cosmology
Космология
Космологія
#Cosmology
#Космология
#Космологія
t.me/scilib_yura15cbx/527PGr Gravitation
Гравитация
Гравітація
#Gravitation
#Гравитация
#Гравітація
t.me/scilib_yura15cbx/526PGe Encyclopaediae physics
Енциклопедія
Энциклопедии
t.me/scilib_yura15cbx/525PE Electromagnetism
Електромагнетизм
Электромагнетизм
#Electromagnetism
#Електромагнетизм
#Электромагнетизм
t.me/scilib_yura15cbx/523PD Dynamical systems
Динамические системы
Динамічна система
t.me/scilib_yura15cbx/522PCh Chemical physics
Хімічна фізика
Химическая физика
#Chemical physics
#Хімічнафізика
#Химическаяфизика
t.me/scilib_yura15cbx/521PCtm Theoretical mechanics
Теоретическая механика
Теоретична механіка
t.me/scilib_yura15cbx/520PCstr Special relativity
Спеціальна теорія відносності
Специальная теория относительности
t.me/scilib_yura15cbx/519PCft Classical fields
Классические поля, классическая теория поля, класична теорія поля
t.me/scilib_yura15cbx/518 -
Scientific Explanations For Deja Vu And The Paranormal
Most of us at some point in our lives have experienced Deja vu, that is we feel as though an experience we’re having or seeing has happened before. Most of us have also had the experience of seeing something out of the corner of our eye, or the sensation of having chills for no known reason. Some people also report that they’ve seen ghosts, spirits or aliens. Some of these phenomena such as ghosts or spirits are quite often associated with people who have passed away, sometimes in […]https://johnbronze.wordpress.com/2026/07/30/scientific-explanations-for-deja-vu-and-the-paranormal/
-
Scientific Explanations For Deja Vu And The Paranormal
Most of us at some point in our lives have experienced Deja vu, that is we feel as though an experience we’re having or seeing has happened before. Most of us have also had the experience of seeing something out of the corner of our eye, or the sensation of having chills for no known reason. Some people also report that they’ve seen ghosts, spirits or aliens. Some of these phenomena such as ghosts or spirits are quite often associated with people who have passed away, sometimes in […]https://johnbronze.wordpress.com/2026/07/30/scientific-explanations-for-deja-vu-and-the-paranormal/
-
But is the captain alive or dead?
-
But is the captain alive or dead?
-
The mirror world hypothesis postulates a hidden universe composed of corresponding mirror particles that interact with ordinary matter almost exclusively through gravity or rare neutral particle oscillations.
#ParticlePhysics #TheoreticalPhysics #QuantumMechanics #sflorg
https://www.sflorg.com/2026/07/phy07282601.html -
The mirror world hypothesis postulates a hidden universe composed of corresponding mirror particles that interact with ordinary matter almost exclusively through gravity or rare neutral particle oscillations.
#ParticlePhysics #TheoreticalPhysics #QuantumMechanics #sflorg
https://www.sflorg.com/2026/07/phy07282601.html -
COW DISTINGUISHES SQPR FROM PENROSE’s Gravitational Localization:
COW Experiment Potentially DISTINGUISHES SQPR
In the 1970s I told Sir Roger Penrose (among others at Stanford) about the basic idea of SQPR. Penrose published in the 1980s the Gravitationally Induced Spontaneous Localization theory which applies the time-energy uncertainty (TEU) relation to spacetime. The two Objective Reduction theories are very different, because they have different collapse mechanisms.
In particular at cosmological scale, SQPR predicts observed facts, such as Dark Matter and Dark Energy, whereas the Penrose theory does not.
The theories also make very different predictions in the lab relative to Quantum Mechanics, and also relative to each other. Let’s explore.
***
Diósi-Penrose Objective Reduction (DPOR) model is a hypothesis proposing that quantum wavefunctions collapse spontaneously due to gravitational instabilities caused by mass superposition. It has the advantage of tying in gravity and Quantum Mechanics (QM) in the simplest manner.
Core Concepts
- Gravity and Superposition: When a massive object exists in a superposition of two different locations, the distribution of its mass creates a simultaneous superposition of two distinct spacetime geometries. (At least that’s what the formalism of Quantum Mechanics predicts!) [1, 2]
- Spacetime Conflict: General relativity requires a single, well-defined spacetime metric, creating a fundamental clash with quantum superposition. [1]
- Objective Reduction: Rather than needing an external observer or measurement to trigger a collapse, gravity forces the system to resolve itself into a single state. [1, 2]
- Timescale: The lifetime of the superposition is inversely proportional to the gravitational self-energy difference between the states. The exact expression obtained by applying the TEU. The duration until collapse is inversely proportional to the difference in gravitational energy between the two different locations (and proportional to Planck constant, of course! It’s direct TEU!)
***
In the Colella-Overhauser-Werner (COW) experiment, realized in 1975, thermal neutrons enter a silicon crystal Mach–Zehnder interferometer. When the interferometer is tilted by an angle theta relative to the horizontal, one arm (Path A) is at a higher gravitational potential than the lower arm (Path B).
It turns out that the energy of the quantum state in the upper branch, Path A, is different in composition from that of the lower branch, Path B. This can be physically demonstrated through the apparition of shifting interference fringes. The effect has been observed.
The reasoning is fascinating: one makes a number of assumptions, simplest and most natural. Those assumptions bring us to a shifting interference pattern shifting in a peculiar way, which is observed. Therefore one is entitled to deduce that the assumptions made were correct, and this tells us many things about matter waves.and in particular how long the guiding waves are. It may also enable to demonstrate in the lab the existence of Objective Reduction theories, which extend understanding beyond Quantum Mechanics.
***
Penrose’s Model Makes Experimental Predictions:
If one plugs the usual numbers in, considering self-gravitation of the neutron, one gets millions of years for Penrose collapse to happen.
However for a single neutron interacting with Earth’s massive gravitational field, going both down a ground branch of the interferometer (B) and the elevated one (A), the difference in gravitational energy is mgh, where g is the usual gravitational acceleration at sea level, m is the mass of the neutron, and h is how high A is above B.
If we extend the COW experiment using large molecules (like fullerenes or 10^4 atoms macromolecular clusters) or Bose–Einstein Condensates (BECs) instead of single neutrons, mgh scales up by 10^4 to $10^6. Then the collapse time drops precipitously from millions of years to milliseconds or microseconds—falling right inside the passage duration of the experiment!
https://quantumnano.at/research/universal-matter-waves/why-matter-waves
***
Penrose does not suggest a plausible mechanism to cause collapse.
DPOR is a particular case of Objective Reduction (OR) models, where one does away with the silliness of an observer and “measurements”.
The other model is SQPR, which ignores gravity, but not matter abundance and the QM state (for example Quantum amplitudes) it is in…
***.
The SQPR Shift:
- If localization is independent of the background gravitational field g and depends instead on the density of surrounding matter fields (and the probability of guiding-wave truncation/shedding), then tilting the interferometer or placing it in a deep gravitational potential well will not alter the intrinsic collapse rate.
- An extended COW experiment conducted at sea level versus one conducted in microgravity (e.g., on the ISS) or on the Moon would yield the exact same decoherence rate in SQPR.
- Under Penrose, microgravity suppresses collapse; under SQPR, space microgravity leaves the collapse rate unchanged because matter-field interactions and guiding-wave limits remain invariant.
[Camping in Sierra Nevada; Post will be improved in future and computations made explicit…]
Patrice Ayme
#Consciousness #COWExperiment #Founndations #Interferometry #Localization #Neutrons #Penrrose #Philosophy #Physics #QuantumMechanics #Science #SQPR -
COW DISTINGUISHES SQPR FROM PENROSE’s Gravitational Localization:
COW Experiment Potentially DISTINGUISHES SQPR
In the 1970s I told Sir Roger Penrose (among others at Stanford) about the basic idea of SQPR. Penrose published in the 1980s the Gravitationally Induced Spontaneous Localization theory which applies the time-energy uncertainty (TEU) relation to spacetime. The two Objective Reduction theories are very different, because they have different collapse mechanisms.
In particular at cosmological scale, SQPR predicts observed facts, such as Dark Matter and Dark Energy, whereas the Penrose theory does not.
The theories also make very different predictions in the lab relative to Quantum Mechanics, and also relative to each other. Let’s explore.
***
Diósi-Penrose Objective Reduction (DPOR) model is a hypothesis proposing that quantum wavefunctions collapse spontaneously due to gravitational instabilities caused by mass superposition. It has the advantage of tying in gravity and Quantum Mechanics (QM) in the simplest manner.
Core Concepts
- Gravity and Superposition: When a massive object exists in a superposition of two different locations, the distribution of its mass creates a simultaneous superposition of two distinct spacetime geometries. (At least that’s what the formalism of Quantum Mechanics predicts!) [1, 2]
- Spacetime Conflict: General relativity requires a single, well-defined spacetime metric, creating a fundamental clash with quantum superposition. [1]
- Objective Reduction: Rather than needing an external observer or measurement to trigger a collapse, gravity forces the system to resolve itself into a single state. [1, 2]
- Timescale: The lifetime of the superposition is inversely proportional to the gravitational self-energy difference between the states. The exact expression obtained by applying the TEU. The duration until collapse is inversely proportional to the difference in gravitational energy between the two different locations (and proportional to Planck constant, of course! It’s direct TEU!)
***
In the Colella-Overhauser-Werner (COW) experiment, realized in 1975, thermal neutrons enter a silicon crystal Mach–Zehnder interferometer. When the interferometer is tilted by an angle theta relative to the horizontal, one arm (Path A) is at a higher gravitational potential than the lower arm (Path B).
It turns out that the energy of the quantum state in the upper branch, Path A, is different in composition from that of the lower branch, Path B. This can be physically demonstrated through the apparition of shifting interference fringes. The effect has been observed.
The reasoning is fascinating: one makes a number of assumptions, simplest and most natural. Those assumptions bring us to a shifting interference pattern shifting in a peculiar way, which is observed. Therefore one is entitled to deduce that the assumptions made were correct, and this tells us many things about matter waves.and in particular how long the guiding waves are. It may also enable to demonstrate in the lab the existence of Objective Reduction theories, which extend understanding beyond Quantum Mechanics.
***
Penrose’s Model Makes Experimental Predictions:
If one plugs the usual numbers in, considering self-gravitation of the neutron, one gets millions of years for Penrose collapse to happen.
However for a single neutron interacting with Earth’s massive gravitational field, going both down a ground branch of the interferometer (B) and the elevated one (A), the difference in gravitational energy is mgh, where g is the usual gravitational acceleration at sea level, m is the mass of the neutron, and h is how high A is above B.
If we extend the COW experiment using large molecules (like fullerenes or 10^4 atoms macromolecular clusters) or Bose–Einstein Condensates (BECs) instead of single neutrons, mgh scales up by 10^4 to $10^6. Then the collapse time drops precipitously from millions of years to milliseconds or microseconds—falling right inside the passage duration of the experiment!
https://quantumnano.at/research/universal-matter-waves/why-matter-waves
***
Penrose does not suggest a plausible mechanism to cause collapse.
DPOR is a particular case of Objective Reduction (OR) models, where one does away with the silliness of an observer and “measurements”.
The other model is SQPR, which ignores gravity, but not matter abundance and the QM state (for example Quantum amplitudes) it is in…
***.
The SQPR Shift:
- If localization is independent of the background gravitational field g and depends instead on the density of surrounding matter fields (and the probability of guiding-wave truncation/shedding), then tilting the interferometer or placing it in a deep gravitational potential well will not alter the intrinsic collapse rate.
- An extended COW experiment conducted at sea level versus one conducted in microgravity (e.g., on the ISS) or on the Moon would yield the exact same decoherence rate in SQPR.
- Under Penrose, microgravity suppresses collapse; under SQPR, space microgravity leaves the collapse rate unchanged because matter-field interactions and guiding-wave limits remain invariant.
[Camping in Sierra Nevada; Post will be improved in future and computations made explicit…]
Patrice Ayme
#Consciousness #COWExperiment #Founndations #Interferometry #Localization #Neutrons #Penrrose #Philosophy #Physics #QuantumMechanics #Science #SQPR -
Theory Of Stellar Spectra by V.V. Sobolev
The only source of our information on stars is their radiation. From stellar spectra we judge the structure of stellar atmospheres, their chemical composition, and physical processes taking place there. Spectrograms are interpreted on the basis of the theory of stellar spectra, wherein lies its enormous value for astrophysics. Until recently astronomers could observe stellar radiation only in a very small range of frequencies making up the visible region of the spectrum. However, about 20 years ago radio astronomy came into being which permits investigating the radiation of celestial bodies in a completely different spectral region.
Quite recently, in connection with the launching of satellites and rockets, there arose the theoretical possibility of obtaining stellar spectra in any frequency range. So far, highly useful spectrograms of stars and the sun have been obtained in the so-called rocket ultraviolet. It is obvious that this broadening of observational data will even further increase the significance of the theory of stellar spectra. At the same time it is necessary to improve and extend this theory.
The surface layers of stars, out of which their spectra arise, represent
strongly ionized gases, i.e., plasma. Plasma studies are also being carried out in physics laboratories, having increased in intensity of late. Methods used by physicists in studying plasmas are in many respects similar to methods used by astrophysicists in studying stellar atmospheres. Therefore, the theory of stellar spectra is of interest not only to astrophysicists but also to physicists.An excellent example of the broad interest in the theory of stellar spectra is the summer seminary on problems of this theory, organized by the
Astronomical Council of the Academy of Sciences of the USSR and the Leningrad University and held in Leningrad in June 1964* About 150 young astrophysicists and physicists of the Soviet Union participated in the sessions. This book was written on the basis of the lectures given at that time.
The first part of the book examines atomic processes associated with the
formation of spectra, with special emphasis on calculation of the energy levels of the atom and the probability of transitions between these levels. The second part deals with the theory of radiation transfer, which forms an important aspect of the theory of stellar spectra. The next two parts discuss the most essential problems in the formation of spectra of different types of stars and nebulae. The last part, devoted to ultraviolet spectra of celestial bodies, mainly gives a review of observational data and their qualitative interpretation (since, as yet, no quantitative theory of these spectra has been established).
The diversity of the problems of the modern theory of stellar spectra makes it impossible to present them with sufficient completeness in a single monograph.
The authors of this book have endeavored to acquaint the reader with the most important of these problems.You can get the book here and here
Follow us on
Twitter https://x.com/MirTitles
Mastadon https://mastodon.social/@mirtitles
Bluesky https://bsky.app/profile/mirtitles.bsky.social
Tumblr https://www.tumblr.com/mirtitles
Internet Archive https://archive.org/details/mir-titles
Fork us on gitlab https://gitlab.com/mirtitles
Preface …………………………………………… iii
PART I. PHYSICAL PROCESSES CONNECTED WITH THE FORMATION OF SPECTRA ………… 1
Plasma Spectroscopy (S.E. Frish) …………………….. 1
Calculations of Atomic Energy Levels (A.P. Yutsis and Ya.I. Vizbarayte) …………… 23
Theory of Atomic Transitions (G.F. Drukarev) ……….. 35PART II. THEORY OF RADIATIVE TRANSFER ……………………… 64
Certain Nonlinear Problems of the Theory of Radiative Transfer (V.A. Ambartsumyan) ……. 64
Radiative Diffusion in Gases (V.V. Sobolev) …………. 75
Determination of the Populations of Excited Levels in an Optically Thick Gas Layer (V.V. Ivanov) ……….. 92
Nonstationary Radiation Field (I.N. Minin) …………. 116
Randomized Problem of Diffuse Reflection (R.V. Ambartsumyan) ………… 135PART III. SPECTRA OF FIXED STARS ……………………….. 140
Models of Stellar Atmospheres (V.V. Sobolev) ………. 140
Continuous Spectra of Hot White Dwarfs (A.K. Kolesov) ……. 147
Model Atmospheres of Main-Sequence Stars of Class M (V.G. Buslavskiy) …….. 152
Determination of the Chemical Composition of Stellar Atmospheres (A.A. Boyarchuk) ……….. 160PART IV. SPECTRA OF NONSTATIONARY STARS AND INTERSTELLAR MATTER ………… 170
Spectra of Nonstationary (Variable) Stars (V.G. Gorbatskiy) ……….. 170
Analysis of the Emission Spectra of Nonstationary Stars (A.A. Boyarchuk) ………… 194
Spectra of Interstellar Matter (S.A. Kaplan) ………… 203
Radio Observations of Planetary Nebulae (Yu. N. Pariyskiy) ………. 216PART V. SPECTRA OF CELESTIAL BODIES IN THE FAR ULTRAVIOLET REGION ……….. 220
#astronomy #astrophysics #physics #quantumMechanics #radiativeTransfer #sovietLiterature #stellarSpectra #stellarStructure
Spectra of Celestial Bodies in the Far Ultraviolet Region (G.A. Gurzadyan) ………. 220 -
Theory Of Stellar Spectra by V.V. Sobolev
The only source of our information on stars is their radiation. From stellar spectra we judge the structure of stellar atmospheres, their chemical composition, and physical processes taking place there. Spectrograms are interpreted on the basis of the theory of stellar spectra, wherein lies its enormous value for astrophysics. Until recently astronomers could observe stellar radiation only in a very small range of frequencies making up the visible region of the spectrum. However, about 20 years ago radio astronomy came into being which permits investigating the radiation of celestial bodies in a completely different spectral region.
Quite recently, in connection with the launching of satellites and rockets, there arose the theoretical possibility of obtaining stellar spectra in any frequency range. So far, highly useful spectrograms of stars and the sun have been obtained in the so-called rocket ultraviolet. It is obvious that this broadening of observational data will even further increase the significance of the theory of stellar spectra. At the same time it is necessary to improve and extend this theory.
The surface layers of stars, out of which their spectra arise, represent
strongly ionized gases, i.e., plasma. Plasma studies are also being carried out in physics laboratories, having increased in intensity of late. Methods used by physicists in studying plasmas are in many respects similar to methods used by astrophysicists in studying stellar atmospheres. Therefore, the theory of stellar spectra is of interest not only to astrophysicists but also to physicists.An excellent example of the broad interest in the theory of stellar spectra is the summer seminary on problems of this theory, organized by the
Astronomical Council of the Academy of Sciences of the USSR and the Leningrad University and held in Leningrad in June 1964* About 150 young astrophysicists and physicists of the Soviet Union participated in the sessions. This book was written on the basis of the lectures given at that time.
The first part of the book examines atomic processes associated with the
formation of spectra, with special emphasis on calculation of the energy levels of the atom and the probability of transitions between these levels. The second part deals with the theory of radiation transfer, which forms an important aspect of the theory of stellar spectra. The next two parts discuss the most essential problems in the formation of spectra of different types of stars and nebulae. The last part, devoted to ultraviolet spectra of celestial bodies, mainly gives a review of observational data and their qualitative interpretation (since, as yet, no quantitative theory of these spectra has been established).
The diversity of the problems of the modern theory of stellar spectra makes it impossible to present them with sufficient completeness in a single monograph.
The authors of this book have endeavored to acquaint the reader with the most important of these problems.You can get the book here and here
Follow us on
Twitter https://x.com/MirTitles
Mastadon https://mastodon.social/@mirtitles
Bluesky https://bsky.app/profile/mirtitles.bsky.social
Tumblr https://www.tumblr.com/mirtitles
Internet Archive https://archive.org/details/mir-titles
Fork us on gitlab https://gitlab.com/mirtitles
Preface …………………………………………… iii
PART I. PHYSICAL PROCESSES CONNECTED WITH THE FORMATION OF SPECTRA ………… 1
Plasma Spectroscopy (S.E. Frish) …………………….. 1
Calculations of Atomic Energy Levels (A.P. Yutsis and Ya.I. Vizbarayte) …………… 23
Theory of Atomic Transitions (G.F. Drukarev) ……….. 35PART II. THEORY OF RADIATIVE TRANSFER ……………………… 64
Certain Nonlinear Problems of the Theory of Radiative Transfer (V.A. Ambartsumyan) ……. 64
Radiative Diffusion in Gases (V.V. Sobolev) …………. 75
Determination of the Populations of Excited Levels in an Optically Thick Gas Layer (V.V. Ivanov) ……….. 92
Nonstationary Radiation Field (I.N. Minin) …………. 116
Randomized Problem of Diffuse Reflection (R.V. Ambartsumyan) ………… 135PART III. SPECTRA OF FIXED STARS ……………………….. 140
Models of Stellar Atmospheres (V.V. Sobolev) ………. 140
Continuous Spectra of Hot White Dwarfs (A.K. Kolesov) ……. 147
Model Atmospheres of Main-Sequence Stars of Class M (V.G. Buslavskiy) …….. 152
Determination of the Chemical Composition of Stellar Atmospheres (A.A. Boyarchuk) ……….. 160PART IV. SPECTRA OF NONSTATIONARY STARS AND INTERSTELLAR MATTER ………… 170
Spectra of Nonstationary (Variable) Stars (V.G. Gorbatskiy) ……….. 170
Analysis of the Emission Spectra of Nonstationary Stars (A.A. Boyarchuk) ………… 194
Spectra of Interstellar Matter (S.A. Kaplan) ………… 203
Radio Observations of Planetary Nebulae (Yu. N. Pariyskiy) ………. 216PART V. SPECTRA OF CELESTIAL BODIES IN THE FAR ULTRAVIOLET REGION ……….. 220
#astronomy #astrophysics #physics #quantumMechanics #radiativeTransfer #sovietLiterature #stellarSpectra #stellarStructure
Spectra of Celestial Bodies in the Far Ultraviolet Region (G.A. Gurzadyan) ………. 220 -
Quantum Shuttle Mechanism Enhances Triplet Energy Transfer in Materials
📰 Original title: A strange quantum effect dramatically boosts energy transfer
🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️View full AI summary https://en.killbait.com/quantum-shuttle-mechanism-enhances-triplet-energy-transfer-in-materials.html?utm_source=mastodon_world&utm_medium=social&utm_campaign=killbait.mastodon_world
-
A paper arguing that the Many Worlds Interpretation of Quantum Mechanics fails to explain the Born Rule.
I haven’t read it all yet. And I may not have the mental tools to judge their argument. I don’t think the Everettian MWI is the answer anyway. So I’m going to be a receptive audience for this paper.
Against Many Worlds https://arxiv.org/html/2607.17086v1
-
A paper arguing that the Many Worlds Interpretation of Quantum Mechanics fails to explain the Born Rule.
I haven’t read it all yet. And I may not have the mental tools to judge their argument. I don’t think the Everettian MWI is the answer anyway. So I’m going to be a receptive audience for this paper.
Against Many Worlds https://arxiv.org/html/2607.17086v1
-
In a quantum physics shocker, light has been transformed into a "supersolid" for the first time! This bizarre state defies physics, acting as both solid and fluid. It's a groundbreaking leap, poised to revolutionize quantum computing and our understanding of matter.
#Fluid #Italy #Light #Liquid #news #Physics #Pisa #Quantum #QuantumMechanics #quantumphysics #science #scie...
https://theaegisalliance.com/2025/03/11/light-transformed-into-a-supersolid-a-quantum-physics-breakthrough/?fsp_sid=2770 -
In a quantum physics shocker, light has been transformed into a "supersolid" for the first time! This bizarre state defies physics, acting as both solid and fluid. It's a groundbreaking leap, poised to revolutionize quantum computing and our understanding of matter.
#Fluid #Italy #Light #Liquid #news #Physics #Pisa #Quantum #QuantumMechanics #quantumphysics #science #scie...
https://theaegisalliance.com/2025/03/11/light-transformed-into-a-supersolid-a-quantum-physics-breakthrough/?fsp_sid=2770 -
Sometimes folks will hang their hats on some tiny, ridiculous thing and you have to remind them that , actually no. Tiny ridiculous things on average tend to scale as tiny ridiculous things.If your searching for ground truth it would be ridiculous to start with those. Start at the top level and work down. Start with #Gravity, not #QuantumMechanics. The rule first, not the exception. As above, so below. Old School.
There is a reason. Scammers all over the place
#Physics -
Long unsolved problems in (place favorite discipline here) are always going to evolve camps that believe some other camp has screwed up big time. The #StandardModel has problems. #QuantumMechanics has problems. #Cosmology has issues. #Relativity has...okay you do you.
At the boundary of our abilities things always get a bit wonky,. For #QuantumMechanics things get pretty weird almost immediately.
Our theory and knowledge have limits. We push them and then complain incessantly.
Onward march -
Researchers at Aalto University have successfully built the world's first cyclic quantum heat engine inside a superconducting circuit, operating near absolute zero. The microscopic device harnesses the minuscule amount of heat present in ultracold quantum conditions to cyclically output positive work.
#QuantumMechanics #QuantumThermodynamics #Cryogenics (low-temperature physics) #AppliedPhysics #sflorg
https://www.sflorg.com/2026/07/qs07132601.html -
Researchers at Aalto University have successfully built the world's first cyclic quantum heat engine inside a superconducting circuit, operating near absolute zero. The microscopic device harnesses the minuscule amount of heat present in ultracold quantum conditions to cyclically output positive work.
#QuantumMechanics #QuantumThermodynamics #Cryogenics (low-temperature physics) #AppliedPhysics #sflorg
https://www.sflorg.com/2026/07/qs07132601.html -
Wow. Sabine gave a study a 0 on the Bullshit Meter. Is this the first time? A rare event has occurred. Give these people a Nobel.
-
Wow. Sabine gave a study a 0 on the Bullshit Meter. Is this the first time? A rare event has occurred. Give these people a Nobel.
-
Why Feynman’s famous declaration that "nobody understands quantum mechanics" remains relevant today. https://hackernoon.com/quantum-mechanics-and-the-psychology-of-uncertainty #quantummechanics
-
Why Feynman’s famous declaration that "nobody understands quantum mechanics" remains relevant today. https://hackernoon.com/quantum-mechanics-and-the-psychology-of-uncertainty #quantummechanics
-
Releyendo "El orden del tiempo", de Carlo Rovelli
#quantumphysics #quantummechanics #thermodynamics -
Releyendo "El orden del tiempo", de Carlo Rovelli
#quantumphysics #quantummechanics #thermodynamics -
If you ask a number of smart and well-studied Physicists whether you can write quantum mechanics using only real numbers, they will nicely split 50-50 into a group answering "Obviously yes!" and another answering "Obviously no!", with only a tiny fraction admitting that this is a non-trivial question.
Which is why I love this kind of papers: https://physics.aps.org/articles/v19/85 -
If you ask a number of smart and well-studied Physicists whether you can write quantum mechanics using only real numbers, they will nicely split 50-50 into a group answering "Obviously yes!" and another answering "Obviously no!", with only a tiny fraction admitting that this is a non-trivial question.
Which is why I love this kind of papers: https://physics.aps.org/articles/v19/85 -
[en] Moore’s Law? When #computer chips can't get smaller (can they?)
"... in the last 15 years, transistors have gotten close to the point where #quantum mechanics starts to interfere with their function: just a few dozen nanometers in size. They can’t get smaller."
"... approach familiar to urban planners: build up. On Thursday, #IBM announced it has created a #chip that uses this strategy. The new #architecture, known as a #nanostack, vertically stacks transistors in two layers on a #silicon chip."
https://www.technologyreview.com/2026/06/25/1139696/ibm-unveils-sub1nm-chip/
-
[en] Moore’s Law? When #computer chips can't get smaller (can they?)
"... in the last 15 years, transistors have gotten close to the point where #quantum mechanics starts to interfere with their function: just a few dozen nanometers in size. They can’t get smaller."
"... approach familiar to urban planners: build up. On Thursday, #IBM announced it has created a #chip that uses this strategy. The new #architecture, known as a #nanostack, vertically stacks transistors in two layers on a #silicon chip."
https://www.technologyreview.com/2026/06/25/1139696/ibm-unveils-sub1nm-chip/
-
Max Planck won the Nobel Prize in Physics in 1918. He is considered the father of quantum mechanics. So why were two of his papers retracted?
https://www.plagiarismtoday.com/2026/06/29/the-mystery-of-the-max-planck-retractions/
-
Max Planck won the Nobel Prize in Physics in 1918. He is considered the father of quantum mechanics. So why were two of his papers retracted?
https://www.plagiarismtoday.com/2026/06/29/the-mystery-of-the-max-planck-retractions/
-
as anyone who's read Wilkinson's famous monograph carefully enough would tell you ;)
`In this Letter we show that a physically motivated postulate about composite quantum systems allows us to construct quantum mechanics based on real numbers that reproduces predictions for all multipartite quantum experiments. Thus, we argue that real-valued quantum mechanics cannot be falsified, and therefore the use of complex numbers is a matter of convenience.`
-
as anyone who's read Wilkinson's famous monograph carefully enough would tell you ;)
`In this Letter we show that a physically motivated postulate about composite quantum systems allows us to construct quantum mechanics based on real numbers that reproduces predictions for all multipartite quantum experiments. Thus, we argue that real-valued quantum mechanics cannot be falsified, and therefore the use of complex numbers is a matter of convenience.`
-
like schrödinger’s cat,
like schrödinger’s cat,
#allAtOnce #bittersweet #both #bounded #dailyPost #gone #haiku #happy #hereAndGone #joy #parallel #parallelUniverse #parallelUniverses #physics #poem #poetry #postaday #quantumMechanics #sad #saudade #schrödinger #schrödingerSCat #science #sehnsucht
all at once, we are both here and
gone, a bounded joy
.
20260626:2043
y -
like schrödinger’s cat,
like schrödinger’s cat,
#allAtOnce #bittersweet #both #bounded #dailyPost #gone #haiku #happy #hereAndGone #joy #parallel #parallelUniverse #parallelUniverses #physics #poem #poetry #postaday #quantumMechanics #sad #saudade #schrödinger #schrödingerSCat #science #sehnsucht
all at once, we are both here and
gone, a bounded joy
.
20260626:2043
y -
This is how quantum mechanics is illustrated in physics textbooks
#book #books #science
#math #physics #chemistry #quantummechanicshttps://www.youtube.com/watch?v=v0zBCUUM76o&list=UULF52kszkc08-acFOuogFl5jw&index=2
-
This is how quantum mechanics is illustrated in physics textbooks
#book #books #science
#math #physics #chemistry #quantummechanicshttps://www.youtube.com/watch?v=v0zBCUUM76o&list=UULF52kszkc08-acFOuogFl5jw&index=2
