DOE OSTI · 3013090
Multiple axions save high-scale inflation
Abstract
Many models of dark matter QCD axion require inflation at a scale H inf ≲ 10 6 GeV ,which precludes a detectable tensor mode fluctuation. This constraint arises because the domain wall problem forces the Peccei-Quinn symmetry to be broken during inflation and the axions to be produced by the misalignment mechanism. Here, we point out that theories with multiple axions can evade this constraint, thereby allowing high-scale inflation with detectable tensor mode. The only requirement is a condition on the anomaly coefficients that ensures a unique minimum of the axion potential without fine-tuning or the introduction of small parameters.
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Kondo, Dan [University of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI)] (ORCID:0000000262683332), Murayama, Hitoshi [University of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI); University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000157699471). 2025-12-09. Multiple axions save high-scale inflation. https://doi.org/10.1088/1475-7516%2F2025%2F12%2F014
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