#hubble-tension — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #hubble-tension, aggregated by home.social.
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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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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 -
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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#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 -
A nice piece in The Atlantic about Adam Reiss, who helped establish the standard model of cosmology and now anticipates its overthrow:
https://www.theatlantic.com/science/archive/2025/05/adam-riess-hubble-tension/682980/?gift=TCdGb93Qc4nVepj3DCKKPrRLXx3DY6pzZkmwCujaCg4&utm_source=copy-link&utm_medium=social&utm_campaign=shareAnd a summary of new data from the Web Telescope that further supports the standard model:
Original paper: https://iopscience.iop.org/article/10.3847/1538-4357/adce78
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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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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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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
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#HubbleTension #HubleCrisis
"Turning the Hubble tension into a crisis: New measurement confirms universe is expanding too fast for current models"Time to add another epicycle to LCDM!
🔗https://phys.org/news/2025-01-hubble-tension-crisis-universe-fast.html
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How fast is the Universe expanding? This astronomer took cosmology closer to an answer
Wendy Freedman is part of Nature’s 10, a list of people who shaped science in 2024.
https://www.nature.com/articles/d41586-024-03899-w
#Cosmology #HubbleTension #HubbleConstant #Science #Nature #astronomer #astronomi #astrophysics #STEM #WomeninSTEM #Womeninscience #Universe
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#HubbleTension #Cosmology #JWST #HST
"Measuring the Hubble constant through the galaxy pairwise peculiar velocity"
<Our results yield H0 = 75.5±1.4 km/s/Mpc>A new method for measuring the Hubble constant.
Their value is at 5.8σ tension with Planck!Accepted for publication in ApJL
🔗https://arxiv.org/abs/2412.04660 -
Webb Researchers Discover Lensed Supernova, Confirm Hubble Tension
#Cosmology #JWST #HubbleConstant #HubbleTension #Universe #Astrodon #science #news
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SN H0pe - the First Measurement of H0 from a Multiply-Imaged Type Ia Supernova, Discovered by JWST: https://arxiv.org/abs/2403.18902 -> Webb Researchers Discover Lensed Supernova, Confirm #HubbleTension: https://webbtelescope.org/contents/early-highlights/webb-researchers-discover-lensed-supernova-confirm-hubble-tension and https://esawebb.org/images/H0pe/
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The #HubbleTension in our own Backyard - #DESI and the Nearness of the #ComaCluster: https://arxiv.org/abs/2409.14546 -> Cool to see the tension being shown also for such "nearby" cosmic objects: https://scicomm.xyz/@franco_vazza@mastodon.social/113191219407119200
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On France Culture today: The Hubble Tension
... in an interview by the excellent Celine Loozen I talk about our Cosmicflows-4 measurement of the Hubble Constant, as well as the value inferred from Ho'oleilana, that are both exacerbating the tension.
▶ at t=33:30 https://www.radiofrance.fr/franceculture/podcasts/la-science-cqfd/constante-de-hubble-la-tension-monte-7710009
#Cosmology #Hubble #HubbleConstant #HubbleTension #Hooleilana #science #Astrodon
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Early galaxies and early dark energy - a unified solution to the #hubbletension and puzzles of massive bright galaxies revealed by JWST: https://academic.oup.com/mnras/article/533/4/3923/7750120?login=false -> Early dark energy could resolve cosmology’s two biggest puzzles: https://news.mit.edu/2024/study-early-dark-energy-could-resolve-cosmologys-two-biggest-puzzles-0913 - in the universe’s first billion years, this brief and mysterious force could have produced more bright galaxies than theory predicts.
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#SH0ES team respond to the paper by Wendy Freedman et al (arXiv:2408.06153) that suggested the #HubbleTension may be over. TLDR: nope not yet. 🧵 with paper at https://bsky.app/profile/styrofoamplates.bsky.social/post/3l2cten7dip2f , and see also this, compiled from the bad place https://threadreaderapp.com/thread/1826593092901712201.html #astrodon
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@michaelgemar Ever since the low H0 from Planck was first published in 2013 with the paper boldy claiming everyone else had to be wrong emotions have been attached to this issue (as they had been to earlier H0 controversies going back decades). I for one am pretty sure - from past experience alone - that https://arxiv.org/abs/2408.06153 does not remove the #HubbleTension ... and its "69.96 +/- 1.05 (stat) +/- 1.12 (sys) km/s/Mpc" sits squarely *between* the two camps anyway. Oh, and H0 is 74 ... ;-)
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Back in April I posted about a meeting at the Royal Society in London called Challenging the Standard Cosmological Model, some of which I attended virtually. In that post I mentioned that Wendy Freedman gave a talk related to the ongoing issue of the Hubble Tension, i.e. the discrepancy between different types of measurement of the Hubble Constant, usually characterized as local measurements (using stellar distance indicators) and larger-scale measurements (chiefly Planck). There are quite a few posts about this issue on this blog. Anyway, Wendy Freedman mention in her talk that her latest work on stellar distances suggested a value of 69.1 ± km s-1 Mpc-1, which reduces the tension with Planck significantly. At the time, however, there was no paper explaining how this number was derived.
Yesterday there appeared on arXiv a preprint by Freedman et al. which summarizes the recent results. The abstract is here:
We present the latest results from the Chicago Carnegie Hubble Program ( CCHP) to measure the Hubble constant using data from the James Webb Space Telescope (JWST). This program is based upon three independent methods: (1) Tip of the Red Giant Branch (TRGB) stars, (2) JAGB (J-Region Asymptotic Giant Branch) stars, and (3) Cepheids. Our program includes 10 nearby galaxies, each hosting Type Ia supernovae (SNe Ia), suitable for measuring the Hubble constant (H0). It also includes NGC 4258, which has a geometric distance, setting the zero point for all three methods. The JWST observations have significantly higher signal-to-noise and finer angular resolution than previous observations with the Hubble Space Telescope (HST). We find three independent values of H0 = 69.85 ± 1.75 (stat) ± 1.54 (sys) for the TRGB, H0 = 67.96 ± 1.85 (stat) ± 1.90 (sys) km s-1 Mpc-1 for the JAGB, and H0 = 72.05 ± 1.86 (stat) ± 3.10 (sys) for Cepheids. Tying into SNe Ia, and combining these methods adopting a flat prior, yields our current estimate of H0 = 69.96 ± 1.05 (stat) ± 1.12 (sys) km s-1 Mpc-1. The distances measured using the TRGB and the JAGB method agree at the 1% level, but differ from the Cepheid distances at the 2.5-4% level. The value of H0 based on these two methods with JWST data alone is H0 = 69.03 ± 1.75 (total error) km s-1 Mpc-1. These numbers are consistent with the current standard ΛCDM model, without the need for the inclusion of additional new physics. Future JWST data will be required to increase the precision and accuracy of the local distance scale.
You can read the full paper on arXiv here. A summary of the summary is that of the three methods they use, two give lower values of the Hubble constant and one (Cepheids) gives a higher value but with larger errors. The number quoted in the Royal Society talk was presumably preliminary as it doesn’t match any of the numbers in the abstract, but the point remains.
You can see the reduction in scatter in the new JWST measurements in this Figure (old on the left and new on the right).
On the face of it, these results suggest that the Hubble tension is greatly reduced. I am sure, however, that advocates of a higher value will have been preparing their ripostes and it’s just a matter of time before they arrive on the arXiv too!
https://telescoper.blog/2024/08/14/hubble-tension-reduced/
#arXiv240806153 #HubbleConstant #HubbleTension #JWST #WendyFreedman