Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings
Abstract
We have conducted extensive lattice simulations to study the postinflation dynamics of multifield models involving nonminimal couplings. In this work, we explore the parameter dependence of preheating in these models and describe the various time scales that control such nonlinear processes as energy transfer, rescattering, and the approach to radiation domination and thermalization. In the limit of large nonminimal couplings ($$ξ_I$$ ~ 100), we find that efficient transfer of energy from the inflaton condensate to radiative degrees of freedom, emergence of a radiation-dominated equation of state, and the onset of thermalization each consistently occur within $$N_{\text{reh}} ≲ 3 e$$-folds after the end of inflation, largely independent of the values of the other couplings in the models. The exception is the case of negative ellipticity, in which there is a misalignment between the dominant direction in field space along which the system evolves and the larger of the nonminimal couplings $$ξ_I$$. In those cases, the field-space-driven parametric resonance is effectively shut off. More generally, the competition between the scalar fields’ potential and the field-space manifold structure can yield interesting phenomena such as two-stage resonances. Across many regions of parameter space, we find efficient re-scattering between the distinct fields, leading to a partial memory loss of the shape of the initial fluctuation spectrum. Despite the explosive particle production, which can lead to a quick depletion of the background energy density, the nonlinear processes do not induce any superhorizon correlations after the end of inflation in these models, which keeps predictions for cosmic microwave background observables unaffected by the late-time amplification of isocurvature fluctuations. Hence the excellent agreement between primordial observables and recent observations is preserved for this class of models, even when we consider postinflation dynamics.
- Authors:
-
[1];
[2];
[3];
[4];
[5]
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Kenyon College, Gambier, OH (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
- Nikhef, Amsterdam (Netherlands); Leiden Univ. (Netherlands)
- Kenyon College, Gambier, OH (United States); Case Western Reserve Univ., Cleveland, OH (United States)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); German Research Foundation (DFG); Dutch Organisation for Scientific Research (NWO); National Science Foundation (NSF)
- OSTI Identifier:
- 1802390
- Grant/Contract Number:
- SC0012567
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. D.
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 4; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Astronomy & Astrophysics; Physics
Citation Formats
van de Vis, Jorinde, Nguyen, Rachel, Sfakianakis, Evangelos I., Giblin, Jr., John T., and Kaiser, David I. Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings. United States: N. p., 2020.
Web. doi:10.1103/physrevd.102.043528.
van de Vis, Jorinde, Nguyen, Rachel, Sfakianakis, Evangelos I., Giblin, Jr., John T., & Kaiser, David I. Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings. United States. https://doi.org/10.1103/physrevd.102.043528
van de Vis, Jorinde, Nguyen, Rachel, Sfakianakis, Evangelos I., Giblin, Jr., John T., and Kaiser, David I. Mon .
"Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings". United States. https://doi.org/10.1103/physrevd.102.043528. https://www.osti.gov/servlets/purl/1802390.
@article{osti_1802390,
title = {Time scales for nonlinear processes in preheating after multifield inflation with nonminimal couplings},
author = {van de Vis, Jorinde and Nguyen, Rachel and Sfakianakis, Evangelos I. and Giblin, Jr., John T. and Kaiser, David I.},
abstractNote = {We have conducted extensive lattice simulations to study the postinflation dynamics of multifield models involving nonminimal couplings. In this work, we explore the parameter dependence of preheating in these models and describe the various time scales that control such nonlinear processes as energy transfer, rescattering, and the approach to radiation domination and thermalization. In the limit of large nonminimal couplings ($ξ_I$ ~ 100), we find that efficient transfer of energy from the inflaton condensate to radiative degrees of freedom, emergence of a radiation-dominated equation of state, and the onset of thermalization each consistently occur within $N_{\text{reh}} ≲ 3 e$-folds after the end of inflation, largely independent of the values of the other couplings in the models. The exception is the case of negative ellipticity, in which there is a misalignment between the dominant direction in field space along which the system evolves and the larger of the nonminimal couplings $ξ_I$. In those cases, the field-space-driven parametric resonance is effectively shut off. More generally, the competition between the scalar fields’ potential and the field-space manifold structure can yield interesting phenomena such as two-stage resonances. Across many regions of parameter space, we find efficient re-scattering between the distinct fields, leading to a partial memory loss of the shape of the initial fluctuation spectrum. Despite the explosive particle production, which can lead to a quick depletion of the background energy density, the nonlinear processes do not induce any superhorizon correlations after the end of inflation in these models, which keeps predictions for cosmic microwave background observables unaffected by the late-time amplification of isocurvature fluctuations. Hence the excellent agreement between primordial observables and recent observations is preserved for this class of models, even when we consider postinflation dynamics.},
doi = {10.1103/physrevd.102.043528},
journal = {Physical Review. D.},
number = 4,
volume = 102,
place = {United States},
year = {Mon Aug 31 00:00:00 EDT 2020},
month = {Mon Aug 31 00:00:00 EDT 2020}
}
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