New Measurements Confirm Faster-Than-Expected Expansion of the Universe
đ° Original title: The Universe is expanding too fast and scientists still canât explain it
đ€ IA: It's clickbait â ïž
đ„ Usuarios: It's clickbait â ïž
View full AI summary: https://killbait.com/en/new-measurements-confirm-faster-than-expected-expansion-of-the-universe/?redirpost=e32909de-08c7-492f-bb86-8ff9b27bc169
New Measurements Confirm Faster-Than-Expected Expansion of the Universe
đ° Original title: The Universe is expanding too fast and scientists still canât explain it
đ€ IA: It's clickbait â ïž
đ„ Usuarios: It's clickbait â ïž
View full AI summary: https://killbait.com/en/new-measurements-confirm-faster-than-expected-expansion-of-the-universe/?redirpost=e32909de-08c7-492f-bb86-8ff9b27bc169
Primordial Magnetic Fields (PMFs), long studied as relics of the early Universe, accelerate recombination and have been proposed as a way to relieve the Hubble tension. However, previous studies relied on simplified toy models. Here we use recent evaluations of recombination with PMFs, incorporating full magnetohydrodynamic (MHD) simulations and detailed Lyman-alpha radiative transfer, to test PMF-enhanced recombination ($bÎ$CDM) against observational data from the cosmic microwave background (CMB), baryon acoustic oscillations (BAO), and Type Ia supernovae (SN). Focusing on non-helical PMFs with a Batchelor spectrum, we find a preference for present-day total field strengths of approximately 5-10 pico-Gauss. Depending on the dataset combination, this preference ranges from mild ($\sim 1.8Ï$ with Planck + DESI) to moderate ($\sim 3Ï$ with Planck + DESI + SH0ES-calibrated SN) significance. The $bÎ$CDM has Planck + DESI $Ï^2$ values equal to or better than $Î$CDM while predicting a higher Hubble constant. Future high-resolution CMB temperature and polarization measurements will be crucial for confirming or further constraining PMFs at recombination. Field strengths of 5-10 pico-Gauss align closely with those required for cluster magnetic fields to originate entirely from primordial sources, without the need for additional dynamo amplification.
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
Le télescope spatial James Webb a repéré un trou noir supermassif pas comme les autres : au lieu de rester bien sagement au centre d'une galaxie, il erre dans l'espace, seul. Autre mystÚre : il se déplace à une vitesse impressionnante. Le phénomÚne est difficile à imaginer : un trou noir supermassif 10 millions de
Les derniĂšres donnĂ©es issues du tĂ©lescope cosmologique dâAtacama ont Ă©tĂ© publiĂ©es. Les rĂ©sultats des chercheurs permettent de mettre en lumiĂšre plusieurs avancĂ©es dans l'Ă©tude de la formation, la composition et lâĂ©volution de lâunivers.
Everyone wants something better than ÎCDM
Thereâs a nice short review article on arXiv today by Mike Turner. I wasnât going to share it because it hasnât got any pictures in it, but changed my mind.
Here is the abstract
The current cosmological paradigm, ÎCDM, 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, ÎCDMâs 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 ÎCDM, provide my views of the path forward, and discuss the role that the âHubble tensionâ might play.
arXiv:2510.05483
To make up for the lack of pictures in the article, hereâs the first image that came up when I did a search for âÎCDMâ:
#arXiv251005483 #Cosmology #HubbleTension #LambdaCDM #MikeTurner
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