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arXiv · 2108.02150

Implications of the Cosmic Birefringence Measurement for the Axion Dark Matter Search

Ippei Obata
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Abstract

We show that a recent constraint on the cosmic birefringence effect due to dark energy can be related to the constraints on the coupling of axion dark matter to photon, by relying on a simple model of two-axion alignment mechanism with periodic potentials. Owing to the alignment of the potentials, one linear combination of two fields provides a nearly flat direction and acts as dark energy, whereas the other combination provides a steep direction and acts as dark matter. This scenario solves the known conceptual issues of one-field model for dark energy and predicts the connection between seemingly disparate constraints on the dark sectors of our universe.

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Ippei Obata. 2021-08-04. Implications of the Cosmic Birefringence Measurement for the Axion Dark Matter Search. https://doi.org/10.1088/1475-7516%2F2022%2F09%2F062

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