#quantumfieldtheory — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #quantumfieldtheory, aggregated by home.social.
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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 -
#paperOfTheDay is "Comparison between large-order estimates and perturbation series in a scalar field theory with Gaussian propagator" from 1978.
The perturbation series for small coupling in #quantumFieldTheory is usually divergent (because the theory with negative coupling describes different #physics and is not "smoothly" connected with the case of positive coupling). To obtain finite physical predictions for the positive coupling case, a #resummation is needed. In the 1970s and 1980s, the computational techniques were for the first time sufficient to reach, say, order 4 in perturbation series computed with #FeynmanDiagram s, and the question arose how to actually do the resummation in practice.
The present paper studies a model quantum field theory, where the propagator is exp(-p^2). This is not physically accurate, but it allows to compute perturbation series to very high order (order 8 here) because the #FeynmanIntegral s are easier. Secondly, one can carry out an #instanton calculation to determine the leading large-order growth. This allows to study whether or not the series coefficients match the expected growth rate, and how to use various different methods of resummation. In particular, the instanton analysis predicts the location and algebraic exponent for the leading singularity in the Borel plane, and this can be used as an additional input: Either, compute the Borel transform directly with a shifted-gamma function to account for the singularity, or make an ansatz of the type (known singularity)x(Pade approximant) for the Borel transformed function. The numerical data shows that this gives substantially higher accuracy for the resummation. https://journals.aps.org/prd/abstract/10.1103/PhysRevD.17.2144 -
Registration is open for the #academicConference "Effective Theories for Nonperturbative #physics " 24 August-4 September in Durham, UK. This conference continues a programme to connect and build a community of researchers in #effectiveFieldTheory and #quantumFieldTheory with emphasis on #nonperturbative aspects, that has been begun with a 2024 conference at the #MITP and a 2025 theory workshop at #CERN
Deadline is 24 June.
https://conference.ippp.dur.ac.uk/event/1546/ -
On March 17-19, there will be a hybrid #HUBerlin /online workshop on theoretical #physics with a special emphasis on fostering collaboration with Ukrainian researchers. Topics are #quantumFieldTheory, #integrability, and #mathematics in theoretical physics. There are several rather high-profile speakers, it could be interesting to watch online even if you can't make it in person. Registration ends today.
Schedule: https://indico.desy.de/event/52099/
Signup : https://forms.cloud.microsoft/pages/responsepage.aspx?id=aTCtyIa26kCyIS9CnXNlGeD0AooaoWlIoGxvStWJhz5UMlI1OFBPSlA1SklBUlNCVEo5VlZVU0pBWS4u&route=shorturl -
#DeanRickles - Is #Time #Fundamental?
https://www.youtube.com/watch?v=1TkPn-QNYtk
#Philosophy #PhilosophyOfTime #Logic #Metaphysics #PhilosophyOfScience #Science #Emergence #Physics #Entropy #StatisticalMechanics #GR #GeneralRelativity #SpecialRelativity #Newton #Einstein #QM #QuantumMechanics #QuantumTheory #FieldTheory #Space #SpaceTime #QuantumFieldTheory #CloserToTruth #RobertKuhn