#darkenergy — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #darkenergy, aggregated by home.social.
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💁🏻♀️ TIL: 🌌🔭 Ethan Siegel traces 20 decades of cosmic #discovery, from #Einstein’s 1919 #eclipse test to #JWST’s “Little Red Dot” #galaxies in the #2020s.
Each decade gets one hallmark finding, including #darkmatter’s first hint, the #BigBang’s theoretical development, and the 1998 discovery of #darkenergy.
👉 https://bigthink.com/starts-with-a-bang/20-biggest-cosmic-discoveries-20-decades/
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💁🏻♀️ TIL: 🌌🔭 Ethan Siegel traces 20 decades of cosmic #discovery, from #Einstein’s 1919 #eclipse test to #JWST’s “Little Red Dot” #galaxies in the #2020s.
Each decade gets one hallmark finding, including #darkmatter’s first hint, the #BigBang’s theoretical development, and the 1998 discovery of #darkenergy.
👉 https://bigthink.com/starts-with-a-bang/20-biggest-cosmic-discoveries-20-decades/
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One number, two universes
Physics' biggest headache: quantum vacuum predicts 10^{122} times more energy than we observe
My approach:
- Standard Model fermion spin degrees of freedom: 90
- Same number derived from dark energy / Planck density ratio: 90.077
They match with 0.086% accuracy.
No new particles. No extra dimensions. No fine-tuning.
Coincidence or clue?
Link + Preprint:
#Physics #Cosmology #DarkEnergy #StandardModel #ParticlePhysics #particlephysics
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One number, two universes
Physics' biggest headache: quantum vacuum predicts 10^{122} times more energy than we observe
My approach:
- Standard Model fermion spin degrees of freedom: 90
- Same number derived from dark energy / Planck density ratio: 90.077
They match with 0.086% accuracy.
No new particles. No extra dimensions. No fine-tuning.
Coincidence or clue?
Link + Preprint:
#Physics #Cosmology #DarkEnergy #StandardModel #ParticlePhysics #particlephysics
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One number, two universes
Physics' biggest headache: quantum vacuum predicts 10^{122} times more energy than we observe
My approach:
- Standard Model fermion spin degrees of freedom: 90
- Same number derived from dark energy / Planck density ratio: 90.077
They match with 0.086% accuracy.
No new particles. No extra dimensions. No fine-tuning.
Coincidence or clue?
Link + Preprint:
#Physics #Cosmology #DarkEnergy #StandardModel #ParticlePhysics #particlephysics
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One number, two universes
Physics' biggest headache: quantum vacuum predicts 10^{122} times more energy than we observe
My approach:
- Standard Model fermion spin degrees of freedom: 90
- Same number derived from dark energy / Planck density ratio: 90.077
They match with 0.086% accuracy.
No new particles. No extra dimensions. No fine-tuning.
Coincidence or clue?
Link + Preprint:
#Physics #Cosmology #DarkEnergy #StandardModel #ParticlePhysics #particlephysics
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One number that could change physics: 90
That’s exactly how many independent spin degrees of freedom exist in the Standard Model.
No new physics. No fine-tuning.
Full derivation here:
Determination of the Cosmological Constant
Magnitude via Phase-Space Suppression
from the Standard Model Fermionic Spin Degrees of Freedomhttps://doi.org/10.5281/zenodo.21515348
#physics #quantumphysics #cosmology #science #darkenergy #vacuum #StandardModel #quantumfield
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One number that could change physics: 90
That’s exactly how many independent spin degrees of freedom exist in the Standard Model.
No new physics. No fine-tuning.
Full derivation here:
Determination of the Cosmological Constant
Magnitude via Phase-Space Suppression
from the Standard Model Fermionic Spin Degrees of Freedomhttps://doi.org/10.5281/zenodo.21515348
#physics #quantumphysics #cosmology #science #darkenergy #vacuum #StandardModel #quantumfield
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One number that could change physics: 90
That’s exactly how many independent spin degrees of freedom exist in the Standard Model.
No new physics. No fine-tuning.
Full derivation here:
Determination of the Cosmological Constant
Magnitude via Phase-Space Suppression
from the Standard Model Fermionic Spin Degrees of Freedom -
One number that could change physics: 90
That’s exactly how many independent spin degrees of freedom exist in the Standard Model.
No new physics. No fine-tuning.
Full derivation here:
Determination of the Cosmological Constant
Magnitude via Phase-Space Suppression
from the Standard Model Fermionic Spin Degrees of Freedom -
"Through fresh analysis of supernovae data, a team of astronomers has discredited a recent study that suggested that dark energy has weakened since the early universe.
Led by Phil Wiseman at the UK’s University of Southampton, the team showed that the apparent weakening almost disappears after accounting for a known correlation between supernova brightness and galaxy mass."
https://physicsworld.com/a/cosmic-crisis-averted-as-supernovae-put-dark-energy-back-on-track/
#DarkEnergy #soton -
A new AI-powered framework could transform how astronomers measure the expansion of the Universe. By analyzing images of Type Ia supernovae and modeling their environments in unprecedented detail,… #science #darkenergy #astronomy
Posted into FLIPBOARD EXCHANGE FEED 🗞️ @flipboard-exchange-feed-Econopass
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NASA’s Nancy Grace Roman Space Telescope's ‘Spy Mirror’ Could Transform How We Map The Universe
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https://www.discovermagazine.com/nasa-s-nancy-grace-roman-space-telescope-s-spy-mirror-could-transform-how-we-map-the-universe-49239 <-- shared technical article
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https://www.mos.org/article/ready-roman-nancy-grace-roman-space-telescope <-- shared technical article
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https://www.space.com/space-exploration/the-nancy-grace-roman-space-telescope-nasas-next-great-observatory-is-finally-complete <-- shared technical article
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https://youtu.be/TcjuucVEB5g?si=I93BjarghNcYKKqj <-- shared NASA Goddard technical overview video
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https://youtu.be/lBAuc057pVA?si=IghhCWC915FO3y3C <-- shared media video
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“… Roman is set to launch on August 30, 2026, and will help us gain a wider view of the universe and collect data faster than its predecessors, such as the Hubble Space Telescope. The telescope will do so thanks to the incredible equipment and instruments built into it.
These instruments include the primary mirror, which was gifted to NASA by a U.S. intelligence agency, the Wide Field Instrument, and an advanced coronograph. Altogether, these instruments could help us map out more of the universe than we ever imagined.
“It is an incredible feat of precision engineering. It's quite possibly the most complex scientific instrument that NASA has ever built,” Dominic Benford, …program scientist for the Nancy Grace Roman Space Telescope…”
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“Named after NASA’s first chief astronomer, the ‘mother of the Hubble Space Telescope,’ the Nancy Grace Roman Space Telescope will have a field of view at least 100 times larger than Hubble's, potentially measuring light from a billion galaxies in its lifetime. This observatory will also be able to block starlight to directly see exoplanets and planet-forming disks, complete a statistical census of planetary systems in our galaxy, and settle essential questions in the areas of dark energy, exoplanets, and infrared astrophysics…”
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The Roman Space Telescope is engineered to investigate the biggest mysteries in astrophysics:
• Dark Energy & Dark Matter: By surveying billions of galaxies and mapping their distribution, Roman will explore why the universe's expansion is accelerating and trace cosmic history.
• Exoplanets: It will utilize gravitational microlensing to complete a statistical census of planetary systems in our galaxy, aiming to find thousands of exoplanets, including elusive rogue planets.
• Infrared Astrophysics: The telescope's deep, crisp infrared vision will help astronomers measure light from up to a billion galaxies over its lifetime.
#coronograph #astronomy #mapping #exoplanets #universe #telescope #spacetelescope #darkenergy #darkmatter #NancyGrace #NASA #Roman #astrophysics #cosmic #infrared #launch #WideFieldInstrument #instumentation #exploration extraterrestrial observatory #space #remotesensing #galacticbulge #spatialanalysis #spatiotemporal #supernova
@nasa @nasa Goddard @Discover Magazine -
NASA’s Nancy Grace Roman Space Telescope's ‘Spy Mirror’ Could Transform How We Map The Universe
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https://www.discovermagazine.com/nasa-s-nancy-grace-roman-space-telescope-s-spy-mirror-could-transform-how-we-map-the-universe-49239 <-- shared technical article
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https://www.mos.org/article/ready-roman-nancy-grace-roman-space-telescope <-- shared technical article
--
https://www.space.com/space-exploration/the-nancy-grace-roman-space-telescope-nasas-next-great-observatory-is-finally-complete <-- shared technical article
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https://youtu.be/TcjuucVEB5g?si=I93BjarghNcYKKqj <-- shared NASA Goddard technical overview video
--
https://youtu.be/lBAuc057pVA?si=IghhCWC915FO3y3C <-- shared media video
--
“… Roman is set to launch on August 30, 2026, and will help us gain a wider view of the universe and collect data faster than its predecessors, such as the Hubble Space Telescope. The telescope will do so thanks to the incredible equipment and instruments built into it.
These instruments include the primary mirror, which was gifted to NASA by a U.S. intelligence agency, the Wide Field Instrument, and an advanced coronograph. Altogether, these instruments could help us map out more of the universe than we ever imagined.
“It is an incredible feat of precision engineering. It's quite possibly the most complex scientific instrument that NASA has ever built,” Dominic Benford, …program scientist for the Nancy Grace Roman Space Telescope…”
--
“Named after NASA’s first chief astronomer, the ‘mother of the Hubble Space Telescope,’ the Nancy Grace Roman Space Telescope will have a field of view at least 100 times larger than Hubble's, potentially measuring light from a billion galaxies in its lifetime. This observatory will also be able to block starlight to directly see exoplanets and planet-forming disks, complete a statistical census of planetary systems in our galaxy, and settle essential questions in the areas of dark energy, exoplanets, and infrared astrophysics…”
--
The Roman Space Telescope is engineered to investigate the biggest mysteries in astrophysics:
• Dark Energy & Dark Matter: By surveying billions of galaxies and mapping their distribution, Roman will explore why the universe's expansion is accelerating and trace cosmic history.
• Exoplanets: It will utilize gravitational microlensing to complete a statistical census of planetary systems in our galaxy, aiming to find thousands of exoplanets, including elusive rogue planets.
• Infrared Astrophysics: The telescope's deep, crisp infrared vision will help astronomers measure light from up to a billion galaxies over its lifetime.
#coronograph #astronomy #mapping #exoplanets #universe #telescope #spacetelescope #darkenergy #darkmatter #NancyGrace #NASA #Roman #astrophysics #cosmic #infrared #launch #WideFieldInstrument #instumentation #exploration extraterrestrial observatory #space #remotesensing #galacticbulge #spatialanalysis #spatiotemporal #supernova
@nasa @nasa Goddard @Discover Magazine -
The instability of critical and underdense Friedmann spacetimes at the Big Bang as an alternative to dark energy: https://royalsocietypublishing.org/rspa/article/482/2338/20250912/481920/The-instability-of-critical-and-underdense -> Taking #DarkEnergy Out of the Equation: https://www.ucdavis.edu/blog/taking-dark-energy-out-equation - UC Davis Mathematicians Challenge the Standard Cosmological Model of the Universe.
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The instability of critical and underdense Friedmann spacetimes at the Big Bang as an alternative to dark energy: https://royalsocietypublishing.org/rspa/article/482/2338/20250912/481920/The-instability-of-critical-and-underdense -> Taking #DarkEnergy Out of the Equation: https://www.ucdavis.edu/blog/taking-dark-energy-out-equation - UC Davis Mathematicians Challenge the Standard Cosmological Model of the Universe.
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Cosmic Voids May Contain the Universe’s Best Secrets
https://web.brid.gy/r/https://www.wired.com/story/cosmic-voids-might-contain-universes-best-secrets/
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Cosmic Voids May Contain the Universe’s Best Secrets
https://fed.brid.gy/r/https://www.wired.com/story/cosmic-voids-might-contain-universes-best-secrets/
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#cosmology, #darkmatter, #darkenergy, #science, #physivs, #Universe
“Beyond ΛCDM: How the SLRPS Field Replaces Dark Matter and Dark Energy Through Present‑Tense Electromagnetic Propagation in NACM Cosmology.”
This paper introduces SLRPS — a structural EM signature that replaces the photon‑centric assumptions behind dark matter and dark energy.
I built this model independently.
https://doi.org/10.5281/zenodo.20347374 -
New 3D map of Universe by Dark Energy Spectroscopic Instrument (#DESI) could solve #darkenergy mystery
Analyses of DESI data from earlier runs have already produced exciting hints of new physics—namely that the Universe’s dark energy, rather than being constant, might vary over time. The latest data must still be analyzed but could help definitively confirm or disprove those hints within the next couple of years.
https://arstechnica.com/science/2026/04/desi-completes-its-3d-map-of-universe-right-on-schedule/ -
New 3D map of Universe by Dark Energy Spectroscopic Instrument (#DESI) could solve #darkenergy mystery
Analyses of DESI data from earlier runs have already produced exciting hints of new physics—namely that the Universe’s dark energy, rather than being constant, might vary over time. The latest data must still be analyzed but could help definitively confirm or disprove those hints within the next couple of years.
https://arstechnica.com/science/2026/04/desi-completes-its-3d-map-of-universe-right-on-schedule/ -
NASA Interview Opportunity: Catch Last Look at NASA’s Newest Space Telescope
#DarkEnergy #NancyGraceRomanSpaceTelescope
▶️ 1 new picture from NASA (SVS) https://commons.wikimedia.org/wiki/File:NASA_Interview_Opportunity-_Catch_Last_Look_at_NASA%E2%80%99s_Newest_Space_Telescope_%28SVS15040%29.jpg
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NASA Interview Opportunity: Catch Last Look at NASA’s Newest Space Telescope
#DarkEnergy #NancyGraceRomanSpaceTelescope
▶️ 1 new picture from NASA (SVS) https://commons.wikimedia.org/wiki/File:NASA_Interview_Opportunity-_Catch_Last_Look_at_NASA%E2%80%99s_Newest_Space_Telescope_%28SVS15040%29.jpg
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#KnowledgeByte: Combining the #DarkEnergy Spectroscopic Instrument (#DESI) data with other experiments shows signs that the impact of dark energy may be weakening over time — and the standard model of how the #Universe works may need an update.
https://knowledgezone.co.in/posts/Is-Dark-Energy-Getting-Weaker-67f3f552da225d23b99cb17a
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#KnowledgeByte: Combining the #DarkEnergy Spectroscopic Instrument (#DESI) data with other experiments shows signs that the impact of dark energy may be weakening over time — and the standard model of how the #Universe works may need an update.
https://knowledgezone.co.in/posts/Is-Dark-Energy-Getting-Weaker-67f3f552da225d23b99cb17a
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A DESI Milestone
Yesterday the Open Journal of Astrophysics published a paper by Porredon et al which will feature in the usual Saturday round-up. That paper, which is based on the First Data Release from the Dark Energy Spectroscopic Instrument (DESI) reminded me that I should mention that DESI recently reached an amazing milestone – it has now mapped the positions and redshifts of 47 million galaxies and quasars! There is a full press-release about this achievement here.
Here’s a little video showing how the survey works:
https://www.youtube.com/watch?v=6H3diAK_KIc
There are more videos and other graphics in the press release.
Here’s a nice picture showing a thin slice through the full survey that reveals the characteristic “cosmic web” of the large-scale structure of the Universe in all its glory:
This progress is great, but it really makes me feel old. Forty years ago, in 1986, I had just started my PhD. The state-of-the-art galaxy redshift survey slice then is shown in this plot, from de Lapparent et al 1986 (ApJLett 302, L1), one of the first papers I read as a research student (I got it in 1985 as a preprint), which contains just 1,100 galaxies:
It is worth mentioning that although DESI has now covered its original target area, it will continue until 2028. You can never have too many galaxy redshifts!
#CosmicWeb #Cosmology #DarkEnergy #DarkEnergySpectroscopicInstrument #DESI #GalaxyRedshiftSurveys -
A DESI Milestone
Yesterday the Open Journal of Astrophysics published a paper by Porredon et al which will feature in the usual Saturday round-up. That paper, which is based on the First Data Release from the Dark Energy Spectroscopic Instrument (DESI) reminded me that I should mention that DESI recently reached an amazing milestone – it has now mapped the positions and redshifts of 47 million galaxies and quasars! There is a full press-release about this achievement here.
Here’s a little video showing how the survey works:
https://www.youtube.com/watch?v=6H3diAK_KIc
There are more videos and other graphics in the press release.
Here’s a nice picture showing a thin slice through the full survey that reveals the characteristic “cosmic web” of the large-scale structure of the Universe in all its glory:
This progress is great, but it really makes me feel old. Forty years ago, in 1986, I had just started my PhD. The state-of-the-art galaxy redshift survey slice then is shown in this plot, from de Lapparent et al 1986 (ApJLett 302, L1), one of the first papers I read as a research student (I got it in 1985 as a preprint), which contains just 1,100 galaxies:
It is worth mentioning that although DESI has now covered its original target area, it will continue until 2028. You can never have too many galaxy redshifts!
#CosmicWeb #Cosmology #DarkEnergy #DarkEnergySpectroscopicInstrument #DESI #GalaxyRedshiftSurveys -
NASA Scientist Investigates the Possibility of a Hidden Fifth Force in Our Solar System
📰 Original title: NASA scientist says a "fifth force" may be hiding in our solar system
🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅View full AI summary: https://killbait.com/en/nasa-scientist-investigates-the-possibility-of-a-hidden-fifth-force-in-our-solar-system/?redirpost=cb61d7a8-a8bc-45c6-94f5-3fab35cf134b
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NASA Scientist Investigates the Possibility of a Hidden Fifth Force in Our Solar System
📰 Original title: NASA scientist says a "fifth force" may be hiding in our solar system
🤖 IA: It's not clickbait ✅
👥 Usuarios: It's not clickbait ✅View full AI summary: https://killbait.com/en/nasa-scientist-investigates-the-possibility-of-a-hidden-fifth-force-in-our-solar-system/?redirpost=cb61d7a8-a8bc-45c6-94f5-3fab35cf134b
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Roman, Hubble’s 300-Megapixel Successor, Will Map the Universe https://petapixel.com/2026/04/22/roman-hubbles-300-megapixel-successor-will-map-the-universe/ #nancygraceromanspacetelescope #spacetelescope #astrophysics #darkenergy #darkmatter #astronomy #telescope #universe #hubble #Space #NGRST #roman #News #NASA
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Roman, Hubble’s 300-Megapixel Successor, Will Map the Universe https://petapixel.com/2026/04/22/roman-hubbles-300-megapixel-successor-will-map-the-universe/ #nancygraceromanspacetelescope #spacetelescope #astrophysics #darkenergy #darkmatter #astronomy #telescope #universe #hubble #Space #NGRST #roman #News #NASA
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#science #physics #darkmatter #darkenergy
Pretty cool stuff here for anyone interested in cosmology.
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The flimsy case for evolving dark energy There's been a lot of talk about evolving dark energy, and how DESI data demands it. But the case for this remains somewhat weak, while the true underlying puzzles remain unsolved. bigthink.com/starts-with-... #physics #astro #space #darkenergy
The flimsy case for evolving d...
