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Center for Astrophysics Research and Technologies Seminar Series Information


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Utilizing a newly revealed symmetry of observables with fundamental constant variation to resolve the Hubble-Lemaitre Tension

Tuesday February 14, 2023
2:00 pm

 Presenter:  Kylar Greene (UNM)
 Series:  Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars
 Abstract:  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.
 Host:  Francis-Yan Cyr-Racine
 Location:  PAIS-3205, PAIS

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