Dark radiation in spectator axion–gauge models
نویسندگان
چکیده
In the framework of axion-gauge fields models, primordial gravitational wave perturbations could be generated during inflationary epoch from not only quantum fluctuation gravitons but also dynamics hidden gauge coupled with an axion field. We investigate evolution and field additional SU(2) group those energy densities after inflation. show that extra radiation component bosons produced by decay can sizable in cases where sourced waves is subdominant. point out future measurements dark energy, such as CMB-S4, impose significant constraints on this cosmological scenario.
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ژورنال
عنوان ژورنال: Progress of Theoretical and Experimental Physics
سال: 2022
ISSN: ['1347-4081', '0033-068X']
DOI: https://doi.org/10.1093/ptep/ptac029