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      Cosmic Birefringence Test of the Hubble Tension

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          Abstract

          An early dark energy component consisting of a cosmic pseudo Nambu-Goldstone boson has been recently proposed to resolve the Hubble tension -- the four-sigma discrepancy between precision measurements of the expansion rate of the universe. Here we point out that such an axion-like component may be expected to couple to electromagnetism by a Chern-Simons term, and will thereby induce an anisotropic cosmic birefringence signal in the polarization of the cosmic microwave background (CMB). We show that observations of the rotation-angle power spectrum and cross-correlation with CMB temperature anisotropy can confirm the presence of this early dark energy component. Future CMB data as expected from the CMB-S4 experiment will improve sensitivity to this effect by two orders of magnitude and help in discriminating between different Hubble tension scenarios.

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            Author and article information

            Journal
            10 September 2019
            Article
            1909.04621
            acef2d93-a1e8-41e0-95d1-ac0654c4ca14

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Custom metadata
            6 pages, 2 figures
            astro-ph.CO gr-qc hep-ph hep-th

            Cosmology & Extragalactic astrophysics,General relativity & Quantum cosmology,High energy & Particle physics

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