Violent preheating in inflation with nonminimal coupling
By Yohei Ema, Ryusuke Jinno, K. Mukaida, K. Nakayama. 2016
158 citations recorded by the source corpus.
We study particle production at the preheating era in inflation models with nonminimal coupling ξϕ2R and quartic potential λϕ4/4 for several cases: real scalar inflaton, complex scalar inflaton and Abelian Higgs inflaton. We point out that the preheating proceeds much more violently than previously thought. If the inflaton is a complex scalar, the phase degree of freedom is violently produced at the first stage of preheating. If the inflaton is a Higgs field, the longitudinal gauge boson production is similarly violent. This is caused by a spike-like feature in the time dependence of the inflaton field, which may be understood as a consequence of the short time scale during which the effective potential or kinetic term changes suddenly. The produced particles typically have very high momenta k ≲ √λMP. The production might be so strong that almost all the energy of the inflaton is carried away within one oscillation for ξ2λ ≳ 𝒪(100). This may partly change the conventional understandings of the (p)reheating after inflation with the nonminimal coupling to gravity such as Higgs inflation. We also discuss the possibility of unitarity violation at the preheating stage.
Subfields: Astronomy and Astrophysics, Atmospheric Science, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/41a861f83a48e030eaaf934b0798aa6252bbbcfe
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Citations in the corpus
- Higgs inflation with loop corrections in the Palatini formulation (2017, background): “As the Standard Model field content and couplings are precisely known,3 in Higgs inflation the processes of preheating and reheating can be calculated in detail, removing the uncertainty in the number of e-folds that accompanies less complete embeddings of inflation into particle physics [32, 34–37]”
- Higgs Inflation (2018, background): “As the type and strength of the interactions among the Higgs field and other SM particles is experimentally known, the duration of this entropy production era can be computed in detail [54–58], leading to precise inflationary predictions in perfect agreement with observations [59].”