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Keyword: background cosmology ×Clear all

3 claims from 1 paper

1. Physics and Astronomy › Cosmology and Gravitation Theories

   ΛCDM Tensions: Localising Missing Physics through Consistency Checks

   Akarsu, Colgáin, Sen and Sheikh-Jabbari · Universe · 2024

   A review of the assumptions behind the ΛCDM model, arguing that redshift-dependent consistency checks can show whether the H0 and S8 tensions point to systematics or new physics.

   Unchecked3 claims
   Show 3 claims

   1. UncheckedThe authors argue that resolving ΛCDM tensions requires testing the model's internal consistency to find where missing physics lies, in redshift or in scale.“Thus, progress towards tension resolution necessitates checking the consistency of the $Λ$CDM model to localise missing physics either in redshift or scale.”
   2. UncheckedThe paper argues that, because redshift tracks cosmic time, tests of consistency across redshift should come before tests across scale in judging tensions.“Since the Universe is dynamical and redshift is a proxy for time, it is imperative to first perform consistency checks involving redshift, then consistency checks involving scale, as the next steps to settle the ``systematics versus new physics" debate and foster informed model building.”
   3. Unchecked“Our discussions indicate that $H_0$ tension, equivalently a redshift dependent $H_0$, and a redshift dependent $S_8$ imply a problem with background $Λ$CDM cosmology.”