#darkenergy — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #darkenergy, aggregated by home.social.
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Whoever discovers dark matter or dark energy controls unlock the Universe.
https://www.sciencealert.com/breaking-physicists-may-have-found-the-best-evidence-of-dark-matter-yet
#DarkMatter #DarkEnergy #Particle #Breakthrough #WIMP #Space #Science #Physics #Astrophysics #NobelPrize
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Whoever discovers dark matter or dark energy controls the Universe.
https://www.sciencealert.com/breaking-physicists-may-have-found-the-best-evidence-of-dark-matter-yet
#DarkMatter #DarkEnergy #Particle #Breakthrough #WIMP #Space #Science #Physics #Astrophysics #NobelPrize
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Whoever discovers dark matter or dark energy controls the Universe.
https://www.sciencealert.com/breaking-physicists-may-have-found-the-best-evidence-of-dark-matter-yet
#DarkMatter #DarkEnergy #Particle #Breakthrough #WIMP #Space #Science #Physics #Astrophysics #NobelPrize
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https://www.europesays.com/at/373509/ Nancy Grace Roman Telescope: 100-fach größeres Sichtfeld für KI-gestützte Datenflüsse #AI #ARTIFICIALINTELLIGENCE #Astronomie #AT #Austria #CloudStorage #DarkEnergy #DarkMatter #DataDownlink #Exoplanets #FieldOfView #Hubble #JamesWebbSpaceTelescope #KI #KünstlicheIntelligenz #L2Point #LuftUndRaumfahrt #NASA #Österreich #Raumfahrt #RomanSpaceTelescope #Science #Science&Technology #Space #Technik #Technology #Weltraum #Wissenschaft #Wissenschaft&Technik
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Nancy Grace Roman Telescope: What NASA’s New Observatory Will Be Searching For
The newly launched Nancy Grace Roman Space Telescope has finally attained orbit. Over the ensuing months, it will…
#Italy #Europe #Europa #EU #Rome #DarkEnergy #DarkMatter #Exoplanets #NASA. #Roman #telescope
https://www.europesays.com/italy/44838/ -
https://www.europesays.com/at/373397/ Nancy Grace Roman Telescope: Start klappt – jetzt beginnt die Exoplaneten- und Dunkle-Materie-Phase #AI #ARTIFICIALINTELLIGENCE #AT #Austria #Coronagraph #DarkEnergy #DarkMatter #Exoplanets #InfraredCamera #KI #KünstlicheIntelligenz #LagrangeL2 #NASA #Österreich #RomanTelescope #Science #Science&Technology #SpaceTelescope #Technik #Technology #Wissenschaft #Wissenschaft&Technik
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The Beginnings of Man -Part 1
The nature of Man has evolved over millions of years, changed by environmental conditions, by the response of his instinctual nature and by the actions of his ego. Man’s inner characteristics are altogether different from the ancestral root which governs other species. Why then is he so different?https://tonyaholisticblog.com/2026/08/31/the-beginnings-of-man-part-1/
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Congratulations to all the teams involved in developing the Nancy Grace Roman Space Telescope and a successful launch this morning.
https://www.youtube.com/live/9wq3VHsL_bE
https://science.nasa.gov/mission/roman-space-telescope/
https://en.wikipedia.org/wiki/Nancy_Roman
#Astrodon #NASA #NancyGraceRomanSpaceTelescope #NancyGraceRoman #DarkMatter #DarkEnergy #Exoplanets #Coronovraph
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Nancy Grace Roman Space Telescope Launches this Sunday
Comments: https://news.ycombinator.com/item?id=49482833
#HackerNews #NancyGraceRomanSpaceTelescope #Launch #NASA #SpaceExploration #DarkEnergy #Astronomy
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NASA’s Nancy Grace Roman Space Telescope set to explore the universe
This weekend, NASA plans to launch its next flagship mission into deep space. The Nancy Grace Roman Space…
#NewsBeep #News #Science #Astronomy #AU #Australia #Darkenergy #darkmatter #hubble #Jameswebbspacetelescope #JWST #NancyGraceRoman #NancyGraceRomanSpaceTelescope #NASA #RomanSpaceTelescope
https://www.newsbeep.com/au/870797/ -
NASA's Nancy Grace Roman Space Telescope: Official Mission Trailer
#DarkEnergy #DarkMatter #Exoplanet #NancyGraceRomanSpaceTelescope #Trailer
▶️ 1 new video from NASA (SVS) https://commons.wikimedia.org/wiki/File:NASA%27s_Nancy_Grace_Roman_Space_Telescope-_Official_Mission_Trailer_%28SVS15081-_Roman_Mission_Trailer_-_Long%29.webm
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NASA’s New Space Telescope Is Poised to Discover Hidden Facets of the Universe
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Significance of Nancy Grace Roman Space Telescope
#Coronagraph #DarkEnergy #DarkMatter #Exoplanet #HubbleSpaceTelescope #JamesWebb #JamesWebbSpaceTelescope #JWST #NancyGraceRoman #NancyGraceRomanSpaceTelescope #NGRST #NASA #Roman #RomanTelescope #WFI #WideFieldInstrument
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"[S]tanding inside a New York defense contractor’s clean room in 2012, Dressler faced an assembly line of Hubble clones. They weren’t astronomy telescopes. They were spy satellites of equal capability. And one of them was being given to NASA for free.
So begins the saga of the Nancy Grace Roman Space Telescope, which now sits in Florida, ready to launch on a SpaceX Falcon Heavy rocket within weeks."
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Scientists Release Biggest 2D Map of the Universe | NOIRLab
https://noirlab.edu/public/news/noirlab2620/
The new DESI Legacy Imaging Surveys map serves as the foundation for the largest-ever 3D map of the Universe, used to investigate dark energy
"The newest DESI Legacy Imaging Surveys map, 13 years in the making, covers three-quarters of the sky and catalogs nearly four billion objects. This treasure trove is available to all and contains stars, galaxies, supernovae, gravitational lenses, and much more. Two NSF NOIRLab facilities contributed data to the map: the U.S. National Science Foundation (NSF) Mayall telescope and the NSF Blanco telescope, equipped with the U.S. Department of Energy-fabricated DECam. …
"The Legacy Surveys’ data will also help scientists train artificial intelligence tools to analyze petabytes of astronomical data and accelerate new discoveries. It will be among the datasets used in an astrophysics pilot project within the American Science Cloud, part of the DOE’s Genesis Mission. ..."
#AI #DESI #LegacySurveys #DarkEnergy #Astronomy #Astrophysics #Cosmology #SpaceScience #MapOfTheUniverse #NightSky #DeepSky #SkySurvey #Universe #Cosmos
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Can a #Lumpy #Universe explain #DarkEnergy? : Medium
The #Emerging Link Between #Microplastics and #HeartDisease : Time
#Supplement that #Binds to #Microplastics may remove them from our #Body : New Sci
Latest #KnowledgeLinks
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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 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 -
"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 -
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 -
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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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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Weekly Update from the Open Journal of Astrophysics – 16/05/2026
It’s Saturday once again, so time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further five papers, bringing the number in Volume 9 (2026) to 104 and the total so far published by OJAp up to 552. It took us until late July to pass 100 last year.
I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter (which nobody should be using); these announcements also show the DOI for each paper.
The first paper to report this week, published on Monday 11th May in the folder High-Energy Astrophysical Phenomena is “Triaxial magnetars as sources of fast radio bursts” by Jonathan I Katz (Washington University, USA). This paper suggests that the mysterious properties of Fast Radio Bursts (FRB) could be explained by triaxial magnetars, with their activity levels influenced by precessional time scales.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
https://fediscience.org/@OJ_Astro/116554775791392800
The second paper for this week, published on Tuesday 12th May in the folder Astrophysics of Galaxies, is “The Abundance of Thin Dwarf Galaxies: a Challenge for Cosmological Simulations” by Jose Benavides & Laura V. Sales (UC Riverside, USA), Julio F. Navarro (U. Victoria, Canada), Simon D. M. White (MPA Garching, Germany), and Carlos S. Frenk, Kyle A. Oman & Shaun Cole (U. Durham, UK). Depending on mass up to 40% of galaxies are intrinsically flat, a fraction that numerical models of galaxy formation struggle to reproduce suggesting the models are incomplete.
The overlay for this one is here:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
https://fediscience.org/@OJ_Astro/116560106342500157
Next one up, the third paper of the week, also published on Tuesday 12th May but in the folder Cosmology and Nongalactic Astrophysics is “Cosmological peculiar velocities in general relativity” by Chris Clarkson (Queen Mary, University of London, UK) and Roy Maartens (U. Western Cape, South Africa). This paper refutes claims that the 1+3 covariant approach to cosmological perturbation theory predicts stronger growth of galaxy peculiar velocities, arguing that standard treatments are correct and fully relativistic.
The overlay for this one is here:
The final, accepted version can be found on arXiv here and the Mastodon announcement is here:
https://fediscience.org/@OJ_Astro/116560224426499932
The fourth paper this week, published on Wednesday May 13th “Possible evidence for a pair-instability supernova nature of ultra-early JWST sources” by Andrea Ferrara & Stefano Carniani (Scuola Normale Superiore, Pisa, Italy), Takahiro Morishita (California Institute of Technology, USA), and Massimo Stiavelli (Space Telescope Science Institute, USA). Published in the section Astrophysics of Galaxies. This paper argues that recent observations challenge early galaxy formation models, suggesting that the bright source, Capotauro, could be a supernova from a massive, metal-free star, not a luminous galaxy as initially thought.
The overlay is here:
The officially accepted version can be found on arXiv here and here is the Mastodon announcement:
https://fediscience.org/@OJ_Astro/116566147448743997
The fifth and final article of this week was also published on Wednesday 13th May but in the folder Cosmology and Nongalactic Astrophysics. The title is “Evolving and interacting dark energy: photometric and spectroscopic synergy with DES Y3 and DESI DR2” and it is by Maria Tsedrik and Benjamin Bose (University of Edinburgh, UK). The study investigates the Dark Scattering interacting dark energy scenario, using data from various sources. Results show no evidence of dark-sector interaction and a preference for the Chevallier-Polarski-Linder parametrisation.
The overlay is here:
You can find the authorized version of this paper on arXiv here and the Fediverse announcement is here:
https://fediscience.org/@OJ_Astro/116566165139100860
And that concludes this week’s update. I’ll do another next Saturday.
#arXiv251211035v3 #arXiv260104953v3 #arXiv260107374v3 #arXiv260314511v2 #AstrophysicsOfGalaxies #Capotauro #ChevallierPolarskiLinder #cosmicShear #cosmologicalSimulations #CosmologyAndNonGalacticAstrophysics #DarkEnergy #DarkEnergySpectroscopicInstrument #DarkEnergySurvey #DarkScattering #DiamondOpenAccess #DiamondOpenAccessPublishing #dwarfGalaxies #fastRadioBursts #galaxyFormation #generalRelativity #HighEnergyAstrophysicalPhenomena #JWST #Magnetars #OpenAccess #OpenAccessPublishing #peculiarVelocities #supernova -
Weekly Update from the Open Journal of Astrophysics – 16/05/2026
It’s Saturday once again, so time for another update of activity at the Open Journal of Astrophysics. Since the last update we have published a further five papers, bringing the number in Volume 9 (2026) to 104 and the total so far published by OJAp up to 552. It took us until late July to pass 100 last year.
I will continue to include the posts made on our Mastodon account (on Fediscience) to encourage you to visit it. Mastodon is a really excellent service, and a more than adequate replacement for X/Twitter (which nobody should be using); these announcements also show the DOI for each paper.
The first paper to report this week, published on Monday 11th May in the folder High-Energy Astrophysical Phenomena is “Triaxial magnetars as sources of fast radio bursts” by Jonathan I Katz (Washington University, USA). This paper suggests that the mysterious properties of Fast Radio Bursts (FRB) could be explained by triaxial magnetars, with their activity levels influenced by precessional time scales.
The overlay for this paper is here
You can find the officially accepted version on arXiv here and the announcement on Fediverse here:
https://fediscience.org/@OJ_Astro/116554775791392800
The second paper for this week, published on Tuesday 12th May in the folder Astrophysics of Galaxies, is “The Abundance of Thin Dwarf Galaxies: a Challenge for Cosmological Simulations” by Jose Benavides & Laura V. Sales (UC Riverside, USA), Julio F. Navarro (U. Victoria, Canada), Simon D. M. White (MPA Garching, Germany), and Carlos S. Frenk, Kyle A. Oman & Shaun Cole (U. Durham, UK). Depending on mass up to 40% of galaxies are intrinsically flat, a fraction that numerical models of galaxy formation struggle to reproduce suggesting the models are incomplete.
The overlay for this one is here:
The official version of the paper can be found on arXiv here and the Fediverse announcement here:
https://fediscience.org/@OJ_Astro/116560106342500157
Next one up, the third paper of the week, also published on Tuesday 12th May but in the folder Cosmology and Nongalactic Astrophysics is “Cosmological peculiar velocities in general relativity” by Chris Clarkson (Queen Mary, University of London, UK) and Roy Maartens (U. Western Cape, South Africa). This paper refutes claims that the 1+3 covariant approach to cosmological perturbation theory predicts stronger growth of galaxy peculiar velocities, arguing that standard treatments are correct and fully relativistic.
The overlay for this one is here:
The final, accepted version can be found on arXiv here and the Mastodon announcement is here:
https://fediscience.org/@OJ_Astro/116560224426499932
The fourth paper this week, published on Wednesday May 13th “Possible evidence for a pair-instability supernova nature of ultra-early JWST sources” by Andrea Ferrara & Stefano Carniani (Scuola Normale Superiore, Pisa, Italy), Takahiro Morishita (California Institute of Technology, USA), and Massimo Stiavelli (Space Telescope Science Institute, USA). Published in the section Astrophysics of Galaxies. This paper argues that recent observations challenge early galaxy formation models, suggesting that the bright source, Capotauro, could be a supernova from a massive, metal-free star, not a luminous galaxy as initially thought.
The overlay is here:
The officially accepted version can be found on arXiv here and here is the Mastodon announcement:
https://fediscience.org/@OJ_Astro/116566147448743997
The fifth and final article of this week was also published on Wednesday 13th May but in the folder Cosmology and Nongalactic Astrophysics. The title is “Evolving and interacting dark energy: photometric and spectroscopic synergy with DES Y3 and DESI DR2” and it is by Maria Tsedrik and Benjamin Bose (University of Edinburgh, UK). The study investigates the Dark Scattering interacting dark energy scenario, using data from various sources. Results show no evidence of dark-sector interaction and a preference for the Chevallier-Polarski-Linder parametrisation.
The overlay is here:
You can find the authorized version of this paper on arXiv here and the Fediverse announcement is here:
https://fediscience.org/@OJ_Astro/116566165139100860
And that concludes this week’s update. I’ll do another next Saturday.
#arXiv251211035v3 #arXiv260104953v3 #arXiv260107374v3 #arXiv260314511v2 #AstrophysicsOfGalaxies #Capotauro #ChevallierPolarskiLinder #cosmicShear #cosmologicalSimulations #CosmologyAndNonGalacticAstrophysics #DarkEnergy #DarkEnergySpectroscopicInstrument #DarkEnergySurvey #DarkScattering #DiamondOpenAccess #DiamondOpenAccessPublishing #dwarfGalaxies #fastRadioBursts #galaxyFormation #generalRelativity #HighEnergyAstrophysicalPhenomena #JWST #Magnetars #OpenAccess #OpenAccessPublishing #peculiarVelocities #supernova -
#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 -
https://www.europesays.com/ie/381941/ Astronomers Created the Largest 3D Map of the Early Universe Revealing Thousands of Hidden Galaxies #cosmology #DarkEnergy #EarlyUniverse #Éire #Galaxy #GalaxyFormation #HETDEX #Hydrogen #IE #Ireland #LineIntensityMapping #LymanAlpha #Science
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https://www.europesays.com/ie/373687/ Enormous 3D map of the universe shows brilliant ‘sea of light’ near the cosmic dawn #BrightGalaxies #CosmicStructure #CosmologicalModels #DarkEnergy #Éire #HobbyEberlyTelescope #HydrogenAtoms #IE #Ireland #light #Science #StarsAndGalaxies #TheUniverse #WavelengthOfLight
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While the holy grail of #InhomogeneousCosmology is to explain #DarkEnergy as an epiphenomenon of the cosmologically recent formation epoch of #CosmicVoids and other #LargeScaleStructure, #YonadavBarryGinat and #PedroGFerreira have gone for a more modest goal: keeping the #CosmologicalConstant but tacking on void formation to get a sort-of #BeyondLCDM inhomogeneous model that better matches #DES and #DESI results [1].
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Cosmology Results from DESI
Yesterday evening (10pm Irish Time) saw the release of new results from the Dark Energy Spectroscopic Instrument (DESI), completing a trio of major announcements of cosmological results in the space of two days (the Atacama Cosmology Telescope and the Euclid Q1 release being the others). I didn’t see the DESI press conference but you can read the press release here.
There were no fewer than eight DESI papers on the astro-ph section of the arXiv this morning. Here are the titles with links:
- DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest
- DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints;
- Construction of the Damped Lyα Absorber Catalog for DESI DR2 Lyα BAO;
- Validation of the DESI DR2 Lyα BAO analysis using synthetic datasets;
- Validation of the DESI DR2 Measurements of Baryon Acoustic Oscillations from Galaxies and Quasars;
- Extended Dark Energy analysis using DESI DR2 BAO measurements;
- Constraints on Neutrino Physics from DESI DR2 BAO and DR1 Full Shape;
- Data Release 1 of the Dark Energy Spectroscopic Instrument.
You can see from the titles that the first seven of these relate to the second data release (DR2; three years of data) from DESI; the last one listed here is a description of the first data release (DR1), which is now publicly available.
Obviously there is a lot of information to digest in these papers so here are two members of the DESI collaboration talking with Shaun Hotchkiss on Cosmology Talks about the key messages from the analysis of Baryon Acoustic Oscillations (the BAO in the titles of the new papers):
https://www.youtube.com/watch?v=YiRaDtslycE
A lot has been made in the press coverage of these results about the evidence that the standard cosmological model is incomplete; see, e.g., here. Here are a few comments.
As I see it, taken on their own, the DESI BAO results are broadly consistent with the ΛCDM model as specified by the parameters determined by the Cosmic Microwave Background (CMB) inferred from Planck. Issues do emerge, however, when these results are combined with other data sets. The most intriguing of these arises with the dark energy contribution. The simplest interpretation of dark energy is that it is a cosmological constant (usually called Λ) which – as explained here – corresponds to a perfect fluid with an equation-of-state p=wρc2 with w=-1. In this case the effective mass density of the dark energy ρ remains constant as the universe expands. To parametrise departures from this constant behaviour, cosmologists have replaced this form with the form w(a)=w0+wa(1-a) where a(t) is the cosmic scale factor. A cosmological constant Λ would correspond to a point (w0=-1, wa=0) in the plane defined by these parameters, but the only requirement for dark energy to result in cosmic acceleration is that w<0 not that w=-1.
The DESI team allow (w0, wa) to act as free parameters and let the DESI data constrain them, either alone or in combinations with other data sets, finding evidence for departures from the “standard values”. Here’s an example plot:
The DESI data don’t include the standard point (at the intersection of the two dashed lines) but the discrepancy gets worse when other data (such as supernovae and CMB) are folded in, as in this picture. The weight of evidence suggests a dark energy contribution which is decreasing with time.
These results are certainly intriguing, and a lot of credit is due to the DESI collaboration for working so hard to identify and remove possible systematics in the analysis (see the papers above) but what do they tell us about ΛCDM?
My view is that we’ve never known what the dark energy actually is or why it is so large that it represents 70% of the overall energy density of the Universe. The Λ in ΛCDM is really just a place-holder, not there for any compelling physical reason but because it is the simplest way of accounting for the observations. In other words, it’s what it is because of Occam’s Razor and nothing more. As with any working hypothesis, the standard cosmological model will get updated whenever new information comes to light (as it is doing now) and/or if we get new physical insights into the origin of dark energy.
Do the latest observations cast doubt on the standard model? I’d say no. We’re seeing an evolutionary change from “We have no idea what the dark energy is but we think it might be a cosmological constant” to “We still have no idea what the dark energy is but we think it might not be a cosmological constant”.
#baryonAcousticOscillations #cosmologicalConstant #Cosmology #DarkEnergy #DarkEnergySpectroscopicInstrument #OccamSRazor #ShaunHotchkiss
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#TimeTravel (#retrograde) is transporting anything into the #past: a #person, a #quantum #signal, a #thought.Resulting from some combination of:
• #QuantumEntanglement
• #Wormholes
• #DarkEnergy & #DarkMatter
• #ManyWorlds & #Multiverse
• #Tachyons & faster-than-light (superluminal) #particles
• #Consciousness may involve quantum processes in the #brain
• Rotating cylinders or gyroscopes (after #HGWells)
• Higher #dimensional #geometries, folding or looping #SpaceTime
• & c … -
#TheMetalDogArticleList
#MetalSucks
Review: Black Tusk Move Ahead with The Way Forward
The comeback is real.https://www.metalsucks.net/2024/04/22/review-black-tusk-move-ahead-with-emthe-way-forward-em/
#blacktusk #doom #savannah #seasonofmist #sludge #thewayforward #reinvention #pushingforward #darkenergy #hope
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#AlanGuth - How Does #DarkEnergy Drive the #Universe?
https://www.youtube.com/watch?v=uTj9qHNoyAQ
#Philosophy #PhilosophyOfScience #Science #PhilosophyOfCosmology #Cosmology #BigBang #Inflation #Expansion #HubbleExpansion #GR #GeneralRelativity #QM #QuantumMechanics #Astrophysics #CosmologicalConstant #CloserToTruth #RobertKuhn
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#SaulPerlmutter - Why Did Our #Universe Begin?
https://www.youtube.com/watch?v=xMu4xFgucJs
#Philosophy #PhilosophyOfScience #Science #PhilosophyOfCosmology #Cosmology #Astrophysics #Astronomy #BigBang #Inflation #CMB #CosmicMicrowaveBackground #Expansion #DarkEnergy #CosmologicalConstant #Space #SpaceTime #DarkMatter #Gravity #CloserToTruth #RobertKuhn
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#RaphaelBousso - Why #Believe in #MultipleUniverses?
https://www.youtube.com/watch?v=qWMX950Fexo
#Philosophy #PhilosophyOfScience #Science #PhilosophyOfCosmology #Cosmology #Astrophysics #Physics #Universe #Multiverse #LawsOfPhysics #LawsOfNature #StringTheory #StringTheoryLandscape #Dimensions #CosmologicalConstant #DarkEnergy #CloserToTruth #RobertKuhn
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#BrianKeating - What Does an #Expanding #Universe Mean?
https://www.youtube.com/watch?v=qoRkUzBeJsU&t=10s&ab_channel=CloserToTruth
#Philosophy #PhilosophyOfCosmology #Cosmology #PhilosophyOfScience #Science #Astronomy #Astrophysics #BigBang #Expansion #ExpandingUniverse #ScalarFields #Gravity #Einstein #GR #GeneralRelativity #CosmologicalConstant #DarkEnergy #DarkMatter #CrisisInCosmology #BigRip #BigCrunch #CloserToTruth #RobertKuhn
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The state of the #DarkEnergy #EquationOfState circa 2023: https://arxiv.org/abs/2307.14802 -> "We deem the combination of Planck CMB, Baryon Acoustic Oscillations, Type Ia Supernovae, and Cosmic Chronometers data to be particularly trustworthy, inferring from this final consensus dataset w=−1.013+0.038/−0.043, in excellent agreement with the #CosmologicalConstant value. Overall, despite a few scattered hints, we find no compelling evidence forcing us away from the cosmological constant (yet)."
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CW: Long List of Space-related Hashtags & Handles
Space
Physical Sciences
#Astronomy #AstroPhysics #CosmologyGeneral
#AsteroidMining #Asteroids #AsteroidThreat #Astrodon #Astronomers #AstronomyMastodon #AstroPhotography #AstroTuesday #BlackHole #BlackHoles #CelestialBodyLanding #ClearSkies #Comet #Comets #DarkEnergy #DarkMatter #DeepSky #DSOC (Deep Space Optical Communications) #Exoplanets #Galaxy #Galaxies #Gravity #GravitationalWaves #HallEffectThruster #HumanSpaceflight #HumanSpaceflightBasics #HumanSpaceflightHealth #HumanSpaceflightSecurity #ISRU (in situ resource utilization) #LaunchCost #Lunar3dPrinting #MoonMining #NightSky #Observatory #Planetarium #PlanetsryScience #PrivateSpaceflight #Pulsars #Quasars #ReusableLaunchVehicle #RocketEngine #RocketScience #SatelliteImprovement #SatelliteInternetAccess #Satellites #SBSP (Space-based Solar Power) #SmallSat #SolarPhysics #Space #SpaceAgency #SpaceCommunication #SpaceCompany #SpaceCraft #SpaceColonization #SpacecraftComparison #SpacecraftPropulsion #SpaceDebris #Spacedon #SpaceEnergy #SpaceEvent #SpaceExploration #SpaceFood #SpaceForce #SpaceHabitat #SpaceHistory #SpaceHotel #SpaceIndustry #SpaceInfrastructure #SpaceLogistics #SpaceMaintenance #SpaceMastodon #SpaceMining #SpaceNavigation #SpacePhotography #SpacePlants #SpacePolitics #SpacePort #SpaceRegulation #SpaceRobot #SpaceScience #SpaceSciFi #SpaceShip #SpaceScience #SpaceStation #SpaceSuit #SpaceTelescope #SpaceTourism #SpaceWelding #SpaceX #StarGazing @starrytimepod #TimeToOrbit #UniverseOrganisations
Canadian Space Agency (CSA) 🇨🇦
#EuropeanSpaceAgency (#ESA) 🇪🇺
European Space Research Organisation (ESRO) 🇪🇺
Japan Aerospace Exploration Agency (#JAXA) 🇯🇵
Jet Propulsion Laboratory (#JPL) 🇺🇸
National Aeronautics and Space Administration (#NASA) 🇺🇸
Space Telescope Science Institute (STSciI) 🇪🇺Missions
#Artemis (#NASAArtemis) #BepiColombo #Cassini COBE #Euclid #EuclidMission #EuropaClipper #Hayabusa2 #InternationalSpaceStation (#ISS) JupiterIcyMoonExplorer (#Juice) #JuiceMission #Juno #Gaia #MMX #Magellan #Voyager1 #Voyager2Space Telescopes
#SpaceTelescope #Telescope#ChandraXRay (#Chandra) #ESAEuclid #EventHorizonTelescope #Hubble #HubbleSpaceTelescope (#HST) #IXPE #JamesWebbSpaceTelescope #JWST (#Webb) #Kepler #MIRI #NIRcam #NIRISS #NIRSpec #Spitzer
Earth Observatories
#Arecibo 🇵🇷 #AtacamaLargeMillimeterArray (#ALMA) 🇨🇱 #CerroTololo 🇨🇱 #EuropeanSouthernObservatory (#ESO) 🇩🇪 #Haleakala 🇺🇸 #Herschel (#WHT) 🇮🇨 #Keck 🇺🇸 #KittPeak 🇺🇸 #LIGO 🇺🇸 #MaunaKea 🇺🇸 #Paranal 🇨🇱 #Parkes 🇦🇺 #RoqueDeLosMuchachos 🇪🇸 #SquareKilometreArrayObservatory (#SKAO) 🇦🇺 #VeryLargeTelescope (#VLT) 🇨🇱Mastodon Observatories
Abbey Ridge Observatory 🇨🇦 @abbeyridgeobs
Burke-Gaffney Observatory 🇨🇦 @BGO
Hamburg Observatory 🇩🇪 @HambObs
Las Cumbres Observatory 🇦🇺 🇿🇦 🇮🇨 🇨🇱 🇺🇸 🇮🇱 🇨🇳 @lco
Mount Burnett Observatory 🇦🇺 @mbo
Rubin Observatory 🇨🇱 @VRubinObs
Stella-Luna Observatory 🇺🇸 @StellaLunaObs
Westport Observatory 🇺🇸 @WestportObservatoryAstrophotography
Andrea Luck @andrealuck
Astronomy Picture of the Day @APoD
Cathie LeBlank @cathieleblanc
Craig Kolb @cek
Dan Kagelmacher @[email protected]
David Blanchflower @DavidBflower
DGMc @Astrobum
Frank Adler @adfr
jdsoubeyran @jdsoubeyran
Kreegan99 @kreegan99
Landru79 @Landru79
Loran Hughes @WestwoodAstro
Mollenberg Observatory @MollenbergSky
Naztronomy @naz
Noom @noom
Philo @philo
Roger Sliva @[email protected]
Simeon Schmauß @stim3on
UniversoMagico @UniversoMagicoSolar System
#Sun #SolarCorona
#KuiperBeltPlanets
#Mercury
#Venus
#Earth
• #Moon #Lunar
#Mars
• #Phobos #Deimos
#Jupiter
• #Callisto #Ganymede #Europa #Io
#Saturn
• #Enceladus #Mimas #Titan
#Uranus
• #Ariel #Miranda Titania
#Neptune
• #TritonDwarf Planets
#Pluto
• #Charon
#Ceres
Makemake
Haumea
#ErisHypothetical
#PlanetXBeyond
OortCloud
#ProximaCentauri
#SagittariusA*
#MilkyWay
#Andromeda (#M31)
#Pleiades (#M45) -
#PaulSteinhardt - How Does #DarkEnergy Drive the #Universe?
https://www.youtube.com/watch?v=VcACmz53LpU&ab_channel=CloserToTruth
#Physics #Science #Cosmology #PhilosophyOfScience #PhilosophyOfCosmology #BigBang #MassEnergy #CosmologicalConstant #GR #GeneralRelativity #GalaxyFormation #CloserToTruth #RobertKuhn
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And talking about the #CosmologicalConstant and its revival 25 years ago ... here comes the paper "Casimir Self-Interaction Energy Density of Quantum Electrodynamic Fields": https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.041601#fulltext -> A new approach for solving the #darkenergy mystery: https://wwwen.uni.lu/universitaet/aktuelles/topthema/ein_neuer_ansatz_zur_loesung_des_raetsels_um_die_dunkle_energie
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#AlanGuth - What Happens in the Far Far #Future ?
https://www.youtube.com/watch?v=0dOiOgr57iU&ab_channel=CloserToTruth
#Science #Physics #Cosmology #Astrophysics #Astronomy #BigBang #Inflation #BigBangTheory #InflationTheory #EternalInflation #ChaoticInflation #FarFuture #PocketUniverse #PocketUniverses #Multiverse #DarkEnergy #CosmologicalConstant #CloserToTruth #RobertKuhn
