Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars
Utilizing a newly revealed symmetry of observables with fundamental constant variation to resolve the Hubble-Lemaitre Tension
Presented by Kylar Greene (UNM)
The tension between local and distant measurements of the Universe's expansion rate continues without resolution. It was recently pointed out that cosmic microwave background (CMB) and large-scale structure (LSS) observables are invariant under a uniform rescaling of the gravitational free-fall rates of all species present and the Thomson scattering rate between photons and electrons. We show here that a specific variation of the fine-structure constant and the electron mass can exploit this scaling transformation to make the CMB and LSS data compatible with a broad range of Hubble constant values, including those inferred from local measurements. Our work highlights the importance of the Thomson scattering rate to the current Hubble tension and provides a clear target for particle model builders.
2:00 pm, Tuesday, February 14, 2023
PAIS-3205, PAIS
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