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Reheating dynamics affects non-perturbative decay of spectator fields · Around

2013

Reheating dynamics affects non-perturbative decay of spectator fields

Enqvist, Kari, Lerner, Rose N., Rusak, Stanislav

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The behaviour of oscillating scalar spectator fields after inflation depends on the thermal background produced by inflaton decay.

Resonant decay of the spectator is often blocked by large induced thermal masses.
We account for the finite decay width of the inflaton and the protracted build-up of the thermal bath to determine the early evolution of a homogeneous spectator field, \sigma, coupled to the Higgs Boson, \Phi, through the term g^2 \sigma^2 \Phi^2, the only renormalisable coupling of a new scalar to the Standard Model.
We find that for very large higgs-spectator coupling g > 10^{-3}, the resonance is not always blocked as was previously suggested.

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