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#astrophysics

39 posts16 participants11 posts today
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Gravity Grinch

Here is a new review paper that I am also part of on the tensions in cosmology:
arxiv.org/abs/2504.01669

As one of my dear collaborators phrased it: 500+ authors wrote 400+ pages on the issues with the cosmological concordance model. So can we still say that LCDM is fine?!
I also contributed because I think that the sum of all issues should make us rethink the 100-yo model.

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arXiv.orgThe CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physicsThe 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. [Abridged]
#astronomy#astrophysics#Cosmology
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UniversoMagico

#UMPlus - Lyman-alpha emission from GS-Z13-1

universomagico.net/2025/04/emi

Observations from the James Webb Space Telescope have found JADES-GS-Z13-1, an incredibly distant galaxy observed just 330 million years after the Big Bang. Its distance from Earth has also been estimated at 33 billion light-years. Initially discovered through deep imaging by an international team of.....
#astronomy #space #astrophysics #astrophotography

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