#hubbletension — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #hubbletension, aggregated by home.social.
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Is #EarlyDarkEnergy a solution for the #HubbleTension? At #ag2026garching Esra Bulbul today highlighted the brand-new paper https://arxiv.org/abs/2609.07834
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Is #EarlyDarkEnergy a solution for the #HubbleTension? At #ag2026garching Esra Bulbul today highlighted the brand-new paper https://arxiv.org/abs/2609.07834
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Is #EarlyDarkEnergy a solution for the #HubbleTension? At #ag2026garching Esra Bulbul today highlighted the brand-new paper https://arxiv.org/abs/2609.07834
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Is #EarlyDarkEnergy a solution for the #HubbleTension? At #ag2026garching Esra Bulbul today highlighted the brand-new paper https://arxiv.org/abs/2609.07834
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‘Cosmic Glitch’ could explain why gravity acts differently across the Universe
Einstein’s theor…
#NewsBeep #News #Physics #AlbertEinstein #Astronomy #Astrophysics #AU #Australia #cosmicglitchingravity #cosmicmicrowavebackground #Cosmology #DarkEnergySurvey #desi #Euclid #generalrelativity #gravity #Hubbleconstant #Hubbletension #NewDiscoveries #PerimeterInstitute #Plancksatellite #research #Science #SpaceNews #UniversityofBritishColumbia #UniversityofWaterloo
https://www.newsbeep.com/au/867344/ -
‘Cosmic Glitch’ could explain why gravity acts differently across the Universe
Einstein’s t…
#NewsBeep #News #Physics #alberteinstein #astronomy #Astrophysics #cosmicglitchingravity #cosmicmicrowavebackground #Cosmology #DarkEnergySurvey #DESI #Euclid #generalrelativity #gravity #HubbleConstant #Hubbletension #NewDiscoveries #PerimeterInstitute #Plancksatellite #research #Science #SpaceNews #UK #UnitedKingdom #UniversityofBritishColumbia #UniversityofWaterloo
https://www.newsbeep.com/uk/748693/ -
https://www.europesays.com/uk/1167515/ ‘Cosmic Glitch’ could explain why gravity acts differently across the Universe #AlbertEinstein #Astronomy #Astrophysics #CosmicGlitchInGravity #CosmicMicrowaveBackground #Cosmology #DarkEnergySurvey #DESI #euclid #GeneralRelativity #gravity #HubbleConstant #HubbleTension #NewDiscoveries #PerimeterInstitute #Physics #PlanckSatellite #Research #Science #SpaceNews #UK #UnitedKingdom #UniversityOfBritishColumbia #UniversityOfWaterloo
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Or if you prefer to read: #AI #research to help those of us that aren't #physicists, and don't want to be! 😹😹😹 #physics #muon #hubbletension #darkmatter #standardmodel
Particle Anomaly and Dark Ener... -
#AI #research to help those of us that aren't #physicists, and don't want to be! 😹😹😹 #physics #muon #hubbletension #darkmatter #standardmodel
RE: https://bsky.app/profile/did:plc:hc7tndm7gduompba65aps75k/post/3mkgwjq4emy2a
How Supercomputers Fixed the M... -
Our local universe’s expansion rate doesn’t add up, astronomers find
A difference of a few kilometers per second might not sound like much. In cosmology, it has become…
#NewsBeep #News #Physics #Astronomy #Astrophysics #AU #Australia #Cepheidstars #cosmicmicrowavebackground #Cosmology #Darkenergy #expandingUniverse #Hubbleconstant #Hubbletension #localUniverse #NSFNOIRLab #research #Science #SpaceNews #TypeIasupernovae
https://www.newsbeep.com/au/604955/ -
New Measurements Confirm Faster-Than-Expected Expansion of the Universe
📰 Original title: The Universe is expanding too fast and scientists still can’t explain it
🤖 IA: It's clickbait ⚠️
👥 Usuarios: It's clickbait ⚠️View full AI summary: https://killbait.com/en/new-measurements-confirm-faster-than-expected-expansion-of-the-universe/?redirpost=e32909de-08c7-492f-bb86-8ff9b27bc169
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New Measurements Confirm Faster-Than-Expected Expansion of the Universe
📰 Original title: The Universe is expanding too fast and scientists still can’t explain it
🤖 IA: It's clickbait ⚠️
👥 Usuarios: It's clickbait ⚠️View full AI summary: https://killbait.com/en/new-measurements-confirm-faster-than-expected-expansion-of-the-universe/?redirpost=e32909de-08c7-492f-bb86-8ff9b27bc169
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New Measurements Confirm Faster-Than-Expected Expansion of the Universe
📰 Original title: The Universe is expanding too fast and scientists still can’t explain it
🤖 IA: It's clickbait ⚠️
👥 Usuarios: It's clickbait ⚠️View full AI summary: https://killbait.com/en/new-measurements-confirm-faster-than-expected-expansion-of-the-universe/?redirpost=e32909de-08c7-492f-bb86-8ff9b27bc169
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Hints of Primordial Magnetic Fields at Recombination and Implications for the Hubble Tension: https://arxiv.org/abs/2503.09599 -> Primordial magnetic fields could resolve the #HubbleTension and other cosmic mysteries: https://www6.slac.stanford.edu/news/2026-03-13-primordial-magnetic-fields-could-resolve-hubble-tension-and-other-cosmic-mysteries - an international team of researchers simulated magnetic forces in the early universe and found they could bridge the gap between the observed and calculated rates of the universe’s expansion.
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Hints of Primordial Magnetic Fields at Recombination and Implications for the Hubble Tension: https://arxiv.org/abs/2503.09599 -> Primordial magnetic fields could resolve the #HubbleTension and other cosmic mysteries: https://www6.slac.stanford.edu/news/2026-03-13-primordial-magnetic-fields-could-resolve-hubble-tension-and-other-cosmic-mysteries - an international team of researchers simulated magnetic forces in the early universe and found they could bridge the gap between the observed and calculated rates of the universe’s expansion.
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Hints of Primordial Magnetic Fields at Recombination and Implications for the Hubble Tension: https://arxiv.org/abs/2503.09599 -> Primordial magnetic fields could resolve the #HubbleTension and other cosmic mysteries: https://www6.slac.stanford.edu/news/2026-03-13-primordial-magnetic-fields-could-resolve-hubble-tension-and-other-cosmic-mysteries - an international team of researchers simulated magnetic forces in the early universe and found they could bridge the gap between the observed and calculated rates of the universe’s expansion.
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Hints of Primordial Magnetic Fields at Recombination and Implications for the Hubble Tension: https://arxiv.org/abs/2503.09599 -> Primordial magnetic fields could resolve the #HubbleTension and other cosmic mysteries: https://www6.slac.stanford.edu/news/2026-03-13-primordial-magnetic-fields-could-resolve-hubble-tension-and-other-cosmic-mysteries - an international team of researchers simulated magnetic forces in the early universe and found they could bridge the gap between the observed and calculated rates of the universe’s expansion.
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https://www.europesays.com/ie/374106/ Ancient Milky Way stars challenge the age of the universe and the Hubble tension #AgeOfTheUniverse #Astronomy #Cepheids #CosmicMicrowaveBackground #cosmology #Éire #GaiaMission #HubbleConstant #HubbleTension #IE #Ireland #MilkyWayStars #Research #Science #Space #SpaceNews #StellarAges #Supernovae
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Ancient Milky Way stars challenge the age of the universe and the Hubble tension
The oldest stars in the Milky Way are forcing a fresh look at one of cosmology’s biggest arguments.…
#NewsBeep #News #Space #ageoftheuniverse #astronomy #Cepheids #cosmicmicrowavebackground #Cosmology #Gaiamission #HubbleConstant #Hubbletension #MilkyWaystars #research #Science #SpaceNews #stellarages #Supernovae #UK #UnitedKingdom
https://www.newsbeep.com/uk/463808/ -
The latest episode of #TheSupermassivePodcast is a great summary of the #HubbleTension. Is it just an experimental problem or a matter of the cosmological model?
https://shows.acast.com/the-supermassive-podcast/episodes/what-is-the-hubble-tension
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https://www.europesays.com/uk/790998/ Scientists develop a new way to measure the expansion rate of the universe #Astronomy #Astrophysics #BlackHoleMergers #Cosmology #GravitationalWaves #HubbleConstant #HubbleTension #LIGOVirgoKAGRA #Physics #Research #Science #SpaceNews #StandardSirens #StochasticGravitationalWaveBackground #UK #UnitedKingdom #UniversityOfIllinoisUrbanaChampaign
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https://www.europesays.com/ie/357745/ Scientists develop a new way to measure the expansion rate of the universe #Astronomy #astrophysics #BlackHoleMergers #cosmology #Éire #GravitationalWaves #HubbleConstant #HubbleTension #IE #Ireland #LIGOVirgoKAGRA #Physics #Research #Science #SpaceNews #StandardSirens #StochasticGravitationalWaveBackground #UniversityOfIllinoisUrbanaChampaign
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Scientists develop a new way to measure the expansion rate of the universe
For years, cosmologists have argued over a simple question with an awkward answer: How fast is the universe…
#NewsBeep #News #Science #Astronomy #Astrophysics #AU #Australia #blackholemergers #Cosmology #Gravitationalwaves #Hubbleconstant #Hubbletension #LIGOVirgoKAGRA #research #SpaceNews #standardsirens #stochasticgravitational-wavebackground #UniversityofIllinoisUrbana-Champaign
https://www.newsbeep.com/au/503270/ -
https://www.europesays.com/ie/354979/ Illinois and UChicago Physicists Develop a New Method to Measure the Expansion Rate of the Universe #Éire #Energy #HighEnergyPhysics #HubbleTension;UniverseExpansionRate;CosmologyResearch;Astrophysics;DarkEnergy;ObservationalAstronomy #IE #Ireland #Newswise #Physics #Science #SpaceAndAstronomy #UniversityOfIllinoisGraingerCollegeOfEngineering
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What a rare lensed supernova could mean for measuring cosmic expansion
A burst of light in the deep sky is doing something it should not be able to do.…
#NewsBeep #News #Science #Astronomy #AU #Australia #Cosmology #gravitationallensing #Hubbleconstant #Hubbletension #MaxPlanckInstitute #research #SN2025wny #SNWinny #SpaceNews #superluminoussupernova #time-delaycosmography #TUM #ZwickyTransientFacility
https://www.newsbeep.com/au/502211/ -
https://www.europesays.com/uk/724470/ A cosmic anomaly suggests we need to rethink the shape of our universe #Cosmology #DarkEnergy #HubbleTension #Physics #Science #UK #UnitedKingdom
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https://www.europesays.com/ie/305072/ A cosmic anomaly suggests we need to rethink the shape of our universe #cosmology #DarkEnergy #Éire #HubbleTension #IE #Ireland #Physics #Science
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Astronomy is facing a real #Cosmology crisis. New observations clash with theory: vast structures defy the #CosmologicalPrinciple, the #HubbleTension persists, and #JWST reveals mature galaxies far earlier than expected. Combined with puzzles in #DarkMatter and #DarkEnergy, the evidence suggests our standard model is incomplete. Rather than doom, this may be a historic “#MercuryMoment” — a rare phase where contradictions drive breakthroughs and reshape our view of the universe.
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https://www.europesays.com/ie/261025/ The universe could very well be lopsided #EdwinHubble #Éire #EuclidSatellite #GaiaSatellite #HubbleTension #IE #Ireland #LambdaCDMModel #Science #Space #SPHERExSatellite #TheConversation #TheUniverse #VeraRubinObservatory
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Everyone wants something better than ΛCDM
There’s a nice short review article on arXiv today by Mike Turner. I wasn’t going to share it because it hasn’t got any pictures in it, but changed my mind.
Here is the abstract
The current cosmological paradigm, ΛCDM, is characterized (b) its expansive description of the history of the Universe, its deep connections to particle physics and the large amounts of data that support it. Nonetheless, ΛCDM’s critics argue that it has been falsified or must be discarded for various reasons. Critics and boosters alike do agree on one thing: it is the not the final cosmological theory and they are anxious to see it replaced by something better! I review the status of ΛCDM, provide my views of the path forward, and discuss the role that the “Hubble tension” might play.
arXiv:2510.05483
To make up for the lack of pictures in the article, here’s the first image that came up when I did a search for “ΛCDM”:
#arXiv251005483 #Cosmology #HubbleTension #LambdaCDM #MikeTurner
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Everyone wants something better than ΛCDM
There’s a nice short review article on arXiv today by Mike Turner. I wasn’t going to share it because it hasn’t got any pictures in it, but changed my mind.
Here is the abstract
The current cosmological paradigm, ΛCDM, is characterized (b) its expansive description of the history of the Universe, its deep connections to particle physics and the large amounts of data that support it. Nonetheless, ΛCDM’s critics argue that it has been falsified or must be discarded for various reasons. Critics and boosters alike do agree on one thing: it is the not the final cosmological theory and they are anxious to see it replaced by something better! I review the status of ΛCDM, provide my views of the path forward, and discuss the role that the “Hubble tension” might play.
arXiv:2510.05483
To make up for the lack of pictures in the article, here’s the first image that came up when I did a search for “ΛCDM”:
#arXiv251005483 #Cosmology #HubbleTension #LambdaCDM #MikeTurner
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Fun to work out with #UCIrvine graduate fellow Helena Garcia Escudero the details of why extra, sterile neutrinos are preferred (!!) by cosmology when adopting the local Cepheid measurement of the Hubble expansion rate. It ties into why baryon acoustic oscillations allow for simultaneous increase in relativistic energy density and neutrino mass, and it’s nontrivial why that happens. The paper will appear tomorrow on the arXiv, following up on a lead in our previous work https://arxiv.org/abs/2412.05451
#physics #astronomy #HubbleTension #cosmology #neutrinos #particlephysics -
Fun to work out with #UCIrvine graduate fellow Helena Garcia Escudero the details of why extra, sterile neutrinos are preferred (!!) by cosmology when adopting the local Cepheid measurement of the Hubble expansion rate. It ties into why baryon acoustic oscillations allow for simultaneous increase in relativistic energy density and neutrino mass, and it’s nontrivial why that happens. The paper will appear tomorrow on the arXiv, following up on a lead in our previous work https://arxiv.org/abs/2412.05451
#physics #astronomy #HubbleTension #cosmology #neutrinos #particlephysics -
Fun to work out with #UCIrvine graduate fellow Helena Garcia Escudero the details of why extra, sterile neutrinos are preferred (!!) by cosmology when adopting the local Cepheid measurement of the Hubble expansion rate. It ties into why baryon acoustic oscillations allow for simultaneous increase in relativistic energy density and neutrino mass, and it’s nontrivial why that happens. The paper will appear tomorrow on the arXiv, following up on a lead in our previous work https://arxiv.org/abs/2412.05451
#physics #astronomy #HubbleTension #cosmology #neutrinos #particlephysics -
The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements
by Adam Riess and co-authors
https://arxiv.org/abs/2509.01667 -
The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements
by Adam Riess and co-authors
https://arxiv.org/abs/2509.01667 -
The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements
by Adam Riess and co-authors
https://arxiv.org/abs/2509.01667 -
The Perfect Host: JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements
by Adam Riess and co-authors
https://arxiv.org/abs/2509.01667 -
in the #arXiv
Prior-free cosmological parameter estimation of Cosmicflows-4
The analysis suggests a Hubble constant value of 75.8±0.4 km/s /Mpc, exacerbating (or independently confirming) the existing "Hubble Tension".
by Chaimongkol Duangchan and co-authors
https://arxiv.org/abs/2507.22236#Cosmology #Cosmicflows #HubbleConstant #HubbleTension #Astrophysics #Astrodon #galaxies #physics #science
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in the #arXiv
Prior-free cosmological parameter estimation of Cosmicflows-4
The analysis suggests a Hubble constant value of 75.8±0.4 km/s /Mpc, exacerbating (or independently confirming) the existing "Hubble Tension".
by Chaimongkol Duangchan and co-authors
https://arxiv.org/abs/2507.22236#Cosmology #Cosmicflows #HubbleConstant #HubbleTension #Astrophysics #Astrodon #galaxies #physics #science
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in the #arXiv
Prior-free cosmological parameter estimation of Cosmicflows-4
The analysis suggests a Hubble constant value of 75.8±0.4 km/s /Mpc, exacerbating (or independently confirming) the existing "Hubble Tension".
by Chaimongkol Duangchan and co-authors
https://arxiv.org/abs/2507.22236#Cosmology #Cosmicflows #HubbleConstant #HubbleTension #Astrophysics #Astrodon #galaxies #physics #science
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in the #arXiv
Prior-free cosmological parameter estimation of Cosmicflows-4
The analysis suggests a Hubble constant value of 75.8±0.4 km/s /Mpc, exacerbating (or independently confirming) the existing "Hubble Tension".
by Chaimongkol Duangchan and co-authors
https://arxiv.org/abs/2507.22236#Cosmology #Cosmicflows #HubbleConstant #HubbleTension #Astrophysics #Astrodon #galaxies #physics #science
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Hubble bubble
I wrote a poem once about God blowing bubbles as a take on creation and cosmology - not that I'm claiming anything or anything - so ... interesting
#HubbleTension #cosmicBubble #localUniverse #redShift #universeExpansion #cosmology
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The CosmoVerse White Paper - Addressing observational tensions in cosmology with systematics and fundamental physics: https://arxiv.org/abs/2504.01669 (hundreds of pages, 4293 references) -> Cosmic conflict continues - new data fuel the #HubbleTension debate: https://physicsworld.com/a/cosmic-conflict-continues-new-data-fuel-the-hubble-tension-debate/. Also A Tale of Many H0: https://www.annualreviews.org/content/journals/10.1146/annurev-astro-052622-033813
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The CosmoVerse White Paper - Addressing observational tensions in cosmology with systematics and fundamental physics: https://arxiv.org/abs/2504.01669 (hundreds of pages, 4293 references) -> Cosmic conflict continues - new data fuel the #HubbleTension debate: https://physicsworld.com/a/cosmic-conflict-continues-new-data-fuel-the-hubble-tension-debate/. Also A Tale of Many H0: https://www.annualreviews.org/content/journals/10.1146/annurev-astro-052622-033813
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The CosmoVerse White Paper - Addressing observational tensions in cosmology with systematics and fundamental physics: https://arxiv.org/abs/2504.01669 (hundreds of pages, 4293 references) -> Cosmic conflict continues - new data fuel the #HubbleTension debate: https://physicsworld.com/a/cosmic-conflict-continues-new-data-fuel-the-hubble-tension-debate/. Also A Tale of Many H0: https://www.annualreviews.org/content/journals/10.1146/annurev-astro-052622-033813
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#HubbleTension
Measuring an intermediate value between two disagreeing values does not solve the tension between those numbers!"Webb telescope helps refine Hubble constant, suggesting resolution to long-standing expansion rate debate"
🔗https://phys.org/news/2025-05-webb-telescope-refines-hubble-constant.html -
#HubbleTension
Measuring an intermediate value between two disagreeing values does not solve the tension between those numbers!"Webb telescope helps refine Hubble constant, suggesting resolution to long-standing expansion rate debate"
🔗https://phys.org/news/2025-05-webb-telescope-refines-hubble-constant.html -
New measure of the universe’s expansion suggests resolution of a conflict | University of Chicago News #hubbletension
https://news.uchicago.edu/story/new-measure-universes-expansion-suggests-resolution-conflict
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New measure of the universe’s expansion suggests resolution of a conflict | University of Chicago News #hubbletension
https://news.uchicago.edu/story/new-measure-universes-expansion-suggests-resolution-conflict
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New measure of the universe’s expansion suggests resolution of a conflict | University of Chicago News #hubbletension
https://news.uchicago.edu/story/new-measure-universes-expansion-suggests-resolution-conflict
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The CosmoVerse: The White Paper
Newly announced on arXiv there is a review article with the title The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics. The abridged form of the abstract reads:
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades. This concordance model is constructed by a universal cosmological constant and supported by a matter sector described by the standard model of particle physics and a cold dark matter contribution, as well as very early-time inflationary physics, and underpinned by gravitation through general relativity. There have always been open questions about the soundness of the foundations of the standard model. However, recent years have shown that there may also be questions from the observational sector with the emergence of differences between certain cosmological probes. In this White Paper, we identify the key objectives that need to be addressed over the coming decade together with the core science projects that aim to meet these challenges. These discordances primarily rest on the divergence in the measurement of core cosmological parameters with varying levels of statistical confidence. These possible statistical tensions may be partially accounted for by systematics in various measurements or cosmological probes but there is also a growing indication of potential new physics beyond the standard model. After reviewing the principal probes used in the measurement of cosmological parameters, as well as potential systematics, we discuss the most promising array of potential new physics that may be observable in upcoming surveys. We also discuss the growing set of novel data analysis approaches that go beyond traditional methods to test physical models.
arXiv:2504.01669v2
Here’s a plot demonstrating one of the tensions discussed in this paper, and widely on this blog, the Hubble Tension:
This is a very comprehensive review article consisting of over 400 pages and having over 400 authors. I expect all of you to read it over the weekend. There will be a test on Monday.
*One of whom happens to be a PhD student of mine.
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The CosmoVerse: The White Paper
Newly announced on arXiv there is a review article with the title The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics. The abridged form of the abstract reads:
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades. This concordance model is constructed by a universal cosmological constant and supported by a matter sector described by the standard model of particle physics and a cold dark matter contribution, as well as very early-time inflationary physics, and underpinned by gravitation through general relativity. There have always been open questions about the soundness of the foundations of the standard model. However, recent years have shown that there may also be questions from the observational sector with the emergence of differences between certain cosmological probes. In this White Paper, we identify the key objectives that need to be addressed over the coming decade together with the core science projects that aim to meet these challenges. These discordances primarily rest on the divergence in the measurement of core cosmological parameters with varying levels of statistical confidence. These possible statistical tensions may be partially accounted for by systematics in various measurements or cosmological probes but there is also a growing indication of potential new physics beyond the standard model. After reviewing the principal probes used in the measurement of cosmological parameters, as well as potential systematics, we discuss the most promising array of potential new physics that may be observable in upcoming surveys. We also discuss the growing set of novel data analysis approaches that go beyond traditional methods to test physical models.
arXiv:2504.01669v2
Here’s a plot demonstrating one of the tensions discussed in this paper, and widely on this blog, the Hubble Tension:
This is a very comprehensive review article consisting of over 400 pages and having over 400 authors. I expect all of you to read it over the weekend. There will be a test on Monday.
*One of whom happens to be a PhD student of mine.
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Nice read again from Triton Station.
"... that perhaps the reason we have to invoke the twin tooth fairies of dark matter and dark energy is to get FLRW to approximate some deeper, underlying theory.
https://tritonstation.com/2025/04/17/some-persistent-cosmic-tensions/
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Nice read again from Triton Station.
"... that perhaps the reason we have to invoke the twin tooth fairies of dark matter and dark energy is to get FLRW to approximate some deeper, underlying theory.
https://tritonstation.com/2025/04/17/some-persistent-cosmic-tensions/
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Do ongoing tensions leave room for new physics?
One century after Edwin Hubble revealed his astonishing discovery of a cosmos beyond the Milky Way, the most precise measurements still can’t agree on how fast galaxies are moving.
By Wendy Freedman
https://www.nature.com/articles/d41586-025-00896-5#HubbleTension #HubbleConstant #Physics #Astronomy #Astrophysics #Astrodon #Science #STEM
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Do ongoing tensions leave room for new physics?
One century after Edwin Hubble revealed his astonishing discovery of a cosmos beyond the Milky Way, the most precise measurements still can’t agree on how fast galaxies are moving.
By Wendy Freedman
https://www.nature.com/articles/d41586-025-00896-5#HubbleTension #HubbleConstant #Physics #Astronomy #Astrophysics #Astrodon #Science #STEM
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Do ongoing tensions leave room for new physics?
One century after Edwin Hubble revealed his astonishing discovery of a cosmos beyond the Milky Way, the most precise measurements still can’t agree on how fast galaxies are moving.
By Wendy Freedman
https://www.nature.com/articles/d41586-025-00896-5#HubbleTension #HubbleConstant #Physics #Astronomy #Astrophysics #Astrodon #Science #STEM
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Results from the Atacama Cosmology Telescope
Today is going to be a very busy day on the cosmology front – with the Euclid Q1 Data Release coming out at 11am GMT – but I’ll start off by sharing news of final data release (DR6) by the Atacama Cosmology Telescope. This was announced yesterday and includes former colleagues at Cardiff University, so congratulations to them and all concerned. Here is a pretty picture showing one of the beautiful cosmic microwave background polarization and intensity maps:
Intensity and Polarization maps from ACT: arXiv:2503.14451There are three related preprints on the arXiv today:
- The Atacama Cosmology Telescope: DR6 Maps (from which the above picture was taken).
- The Atacama Cosmology Telescope: DR6 Power Spectra, Likelihoods and ΛCDM Parameters
- The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models
There’s a lot to digest in these papers but a quick skim of the abstracts gives two pertinent points. First, from the second paper:
We find that the ACT angular power spectra estimated over 10,000 deg2, and measured to arcminute scales in TT, TE and EE, are well fit by the sum of CMB and foregrounds, where the CMB spectra are described by the ΛCDM model. Combining ACT with larger-scale Planck data, the joint P-ACT dataset provides tight limits on the ingredients, expansion rate, and initial conditions of the universe.
They also find that, when combined with CMB lensing from ACT and Planck, and baryon acoustic oscillation data from the Dark Energy Spectroscopic Instrument (DESI Y1), the ACT data give a “low” value for the Hubble constant: H0=68.22 ± 0.36 km s-1 Mpc-1.
The third paper also says
In general, models introduced to increase the Hubble constant or to decrease the amplitude of density fluctuations inferred from the primary CMB are not favored by our data.
The “Hubble tension” remains!
#ACT #arXiv250314451 #arXiv250314452 #arXiv250314454 #AtacamaCosmologyTelescope #CosmicMicrowaveBackground #Cosmology #HubbleTension