Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 5, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP05(2020)080
Keywords
Beyond Standard Model; Cosmology of Theories beyond the SM
Categories
Funding
- Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy [EXC 2121, 390833306]
- Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter - German Research Foundation (DFG) within the German Excellence Strategy [PRISMA+ EXC 2118/1, 39083149]
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In implementations of the electroweak scale cosmological relaxation mechanism proposed so far, the effect of the quantum fluctuations of the homogeneous relaxion field has been ignored. We show that they can grow during the classical cosmological evolution of the relaxion field passing through its many potential barriers. The resulting production of relaxion particles can act as an efficient stopping mechanism for the relaxion. We revisit the original relaxion proposal and determine under which conditions inflation may no longer be needed as a source of friction. We review alternative stopping mechanisms and determine in detail the allowed parameter space for each of them (whether happening before, during and after inflation), also considering and severely constraining the case of friction from electroweak gauge boson production in models with large and Higgs-independent barriers.
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