Constraining Axion Inflation with Gravitational Waves across 29 Decades in Frequency.
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DOI: 10.1103/physrevlett.124.171301
Abstract: We demonstrate that gravitational waves generated by efficient gauge preheating after axion inflation generically contribute significantly to the effective number of relativistic degrees of freedom N_{eff}. We show that, with existing Planck limits, gravitational waves… read more here.
Keywords: axion inflation; gravitational waves; gauge preheating;