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Title: Self-resonance after inflation: Oscillons, transients, and radiation domination

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Related Information: CHORUS Timestamp: 2018-01-29 10:33:08; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Lozanov, Kaloian D., and Amin, Mustafa A. Self-resonance after inflation: Oscillons, transients, and radiation domination. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.023533.
Lozanov, Kaloian D., & Amin, Mustafa A. Self-resonance after inflation: Oscillons, transients, and radiation domination. United States. doi:10.1103/PhysRevD.97.023533.
Lozanov, Kaloian D., and Amin, Mustafa A. 2018. "Self-resonance after inflation: Oscillons, transients, and radiation domination". United States. doi:10.1103/PhysRevD.97.023533.
title = {Self-resonance after inflation: Oscillons, transients, and radiation domination},
author = {Lozanov, Kaloian D. and Amin, Mustafa A.},
abstractNote = {},
doi = {10.1103/PhysRevD.97.023533},
journal = {Physical Review D},
number = 2,
volume = 97,
place = {United States},
year = 2018,
month = 1

Journal Article:
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This content will become publicly available on January 29, 2019
Publisher's Accepted Manuscript

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  • Oscillons are spatially localized and relatively stable field fluctuations which can form after inflation under suitable conditions. In order to reheat the universe, the fields which dominate the energy density after inflation have to couple to other degrees of freedom and finally produce the matter particles present in the universe today. In this study, we use lattice simulations in 2+1 dimensions to investigate how such couplings can affect the formation and stability of oscillons. We focus on models of hilltop inflation, where we have recently shown that hill crossing oscillons generically form, and consider the coupling to an additional scalarmore » field which, depending on the value of the coupling parameter, can get resonantly enhanced from the inhomogeneous inflaton field. We find that three cases are realized: without a parametric resonance, the additional scalar field has no effects on the oscillons. For a fast and strong parametric resonance of the other scalar field, oscillons are strongly suppressed. For a delayed parametric resonance, on the other hand, the oscillons get imprinted on the other scalar field and their stability is even enhanced compared to the single-field oscillons.« less
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  • We investigate the feasibility of explosive particle production via parametric resonance or tachyonic preheating in multifield inflationary models by means of lattice simulations. We observe a strong suppression of resonances in the presence of four-leg interactions between the inflaton fields and a scalar matter field, leading to insufficient preheating when more than two inflatons couple to the same matter field. This suppression is caused by a dephasing of the inflatons that increases the effective mass of the matter field. Including three-leg interactions leads to tachyonic preheating, which is not suppressed by an increase in the number of fields. If four-legmore » interactions are subdominant, we observe a slight enhancement of tachyonic preheating. Thus, in order for preheating after multifield inflation to be efficient, one needs to ensure that three-leg interactions are present. If no tachyonic contributions exist, we expect the old theory of reheating to be applicable.« less