High Energy Physics - Phenomenology
[Submitted on 20 Apr 2023 (v1), last revised 4 Dec 2023 (this version, v3)]
Title:Dai-Freed anomaly in the standard model and topological inflation
View PDF HTML (experimental)Abstract:When we impose the discrete symmetry in the standard model we have Dai-Freed global anomalies. However, interestingly if we introduce three right-handed neutrinos we can have an anomaly-free discrete $Z_4$ gauge symmetry. This $Z_4$ symmetry should be spontaneously broken down to the $Z_2$ symmetry to generate the heavy Majorana masses for the right-handed neutrinos. We show that this symmetry breaking naturally generates topological inflation, which is consistent with the CMB observations at present and predicts a significant tensor mode with scalar-tensor ratio $r > 0.03$. The right-handed neutrinos play an important role in reheating processes. The reheating temperature is as high as $\sim 10^8$GeV, and non-thermal leptogenesis successfully takes place.
Submission history
From: Masahiro Kawasaki [view email][v1] Thu, 20 Apr 2023 05:49:29 UTC (70 KB)
[v2] Fri, 28 Apr 2023 07:21:55 UTC (70 KB)
[v3] Mon, 4 Dec 2023 23:55:35 UTC (143 KB)
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