$U(1{)}_{B-L}$ extra-natural inflation with Standard Model on a brane

Abstract

The interrelation between inflationary cosmology and new physics beyond the Standard Model (SM) is studied in a $U(1{)}_{B-L}$ extension of the SM embedded in a (4+1)-dimensional spacetime. In the scenario we study, the inflaton arises from the Wilson loop of the $U(1{)}_{B-L}$ gauge group winding an extra-dimensional cycle. Particular attention is paid to the coupling between the inflaton and SM particles that are confined on a brane localised in the extra dimension. We find that the inflaton decay channels are rather restricted in this scenario and the resulting reheating temperature is relatively low.

1+14 pages

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• Large Field Inflation Models from Higher-Dimensional Gauge Theories
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Natural Inflation on the brane with a TeV-scale gravity: Parameter constraints after Planck 2015