Robustness of BAO Constraints to Beyond ΛCDM Cosmologies AND the Cosmic Expansion History from Line Intensity Mapping

Abstract: Baryon acoustic oscillations (BAO) measurements are key to constrain cosmology at low redshift. While the standard BAO analysis is claimed to return model-independent constraints of the expansion history of the Universe, it assumes a LCDM fiducial cosmology. This assumption may limit the validity and robustness of BAO measurements to constrain beyond-LCDM cosmologies, challenging their model-independent nature. We demonstrate that standard BAO analysis assuming a fiducial LCDM cosmology is unbiased when using synthetic power spectra from extended cosmologies, and find that the H0 tension cannot be solved by modifying only the neutrino phase shift. In addition, we explore the potential of using the intensity mapping of molecular lines to extend BAO measurements to higher redshifts and the implications for the H0 tension.

Video of Talk: https://www.youtube.com/watch?v=WiTcAUXIUO4

Relevant Papers:
[2004.07263] Robustness of baryon acoustic oscillations constraints to beyond-$Λ$CDM cosmologies, by José Luis Bernal, Tristan L. Smith, Kimberly K. Boddy, Marc Kamionkowski
[1907.10065] The Cosmic Expansion History from Line-Intensity Mapping, by José Luis Bernal, Patrick C. Breysse, Ely D. Kovetz

cosmology and nongalactic astrophysicsgeneral relativity and quantum cosmology

Audience: advanced learners

( paper | slides | video )

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CosmoConβ - Cosmology from Home

Series comments: Cosmology from Home is an online cosmology conference. One of its features are pre-recorded talks, publicly available at its YouTube channel.

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