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Title: Tachyonic resonance preheating in an expanding universe

Abstract

In this paper the tachyonic resonance preheating generated from the bosonic trilinear {phi}{chi}{sup 2} interactions in an expanding universe is studied. In {lambda}{phi}{sup 4}/4 inflationary model the trilinear interaction, in contrast to the four-legs {phi}{sup 2{chi}2}, breaks the conformal symmetry explicitly and the resonant source term becomes nonperiodic, making the Floquet theorem inapplicable. We find that the occupation number of the produced {chi} particles has a nonlinear exponential growth with exponent {approx}x{sup 3/2}, where x is the conformal time. This should be contrasted with preheating from a periodic resonant source arising, for example, from the four-legs {phi}{sup 2{chi}2} interaction, where the occupation number has a linear exponential growth. We present an analytic method to compute the interference term coming from phases accumulated in nontachyonic scattering regions and show that the effects of the interference term cause ripples on x{sup 3/2} curve, a result which is confirmed by numerical analysis. Studying the effects of backreaction of the {chi} particles, we show that tachyonic resonance preheating in our model can last long enough to transfer most of the energy from the background inflation field {phi}, providing an efficient model for preheating in the chaotic inflation models.

Authors:
 [1]; ;  [2]
  1. Department of Physics, Sharif University of Technology, Tehran (Iran, Islamic Republic of)
  2. School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
21413393
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 81; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevD.81.043524; (c) 2010 The American Physical Society; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHAOS THEORY; CONFORMAL INVARIANCE; HEAT TREATMENTS; INFLATIONARY UNIVERSE; INTERACTIONS; INTERFERENCE; NONLINEAR PROBLEMS; NUMERICAL ANALYSIS; OCCUPATION NUMBER; PARTICLES; PERIODICITY; RESONANCE; SCATTERING; TACHYONS; COSMOLOGICAL MODELS; ELEMENTARY PARTICLES; INVARIANCE PRINCIPLES; MATHEMATICAL MODELS; MATHEMATICS; POSTULATED PARTICLES; VARIATIONS

Citation Formats

Abolhasani, Ali Akbar, School of Physics, Institute for Research in Fundamental Sciences, Firouzjahi, Hassan, and Sheikh-Jabbari, M M. Tachyonic resonance preheating in an expanding universe. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.81.043524.
Abolhasani, Ali Akbar, School of Physics, Institute for Research in Fundamental Sciences, Firouzjahi, Hassan, & Sheikh-Jabbari, M M. Tachyonic resonance preheating in an expanding universe. United States. https://doi.org/10.1103/PHYSREVD.81.043524
Abolhasani, Ali Akbar, School of Physics, Institute for Research in Fundamental Sciences, Firouzjahi, Hassan, and Sheikh-Jabbari, M M. 2010. "Tachyonic resonance preheating in an expanding universe". United States. https://doi.org/10.1103/PHYSREVD.81.043524.
@article{osti_21413393,
title = {Tachyonic resonance preheating in an expanding universe},
author = {Abolhasani, Ali Akbar and School of Physics, Institute for Research in Fundamental Sciences and Firouzjahi, Hassan and Sheikh-Jabbari, M M},
abstractNote = {In this paper the tachyonic resonance preheating generated from the bosonic trilinear {phi}{chi}{sup 2} interactions in an expanding universe is studied. In {lambda}{phi}{sup 4}/4 inflationary model the trilinear interaction, in contrast to the four-legs {phi}{sup 2{chi}2}, breaks the conformal symmetry explicitly and the resonant source term becomes nonperiodic, making the Floquet theorem inapplicable. We find that the occupation number of the produced {chi} particles has a nonlinear exponential growth with exponent {approx}x{sup 3/2}, where x is the conformal time. This should be contrasted with preheating from a periodic resonant source arising, for example, from the four-legs {phi}{sup 2{chi}2} interaction, where the occupation number has a linear exponential growth. We present an analytic method to compute the interference term coming from phases accumulated in nontachyonic scattering regions and show that the effects of the interference term cause ripples on x{sup 3/2} curve, a result which is confirmed by numerical analysis. Studying the effects of backreaction of the {chi} particles, we show that tachyonic resonance preheating in our model can last long enough to transfer most of the energy from the background inflation field {phi}, providing an efficient model for preheating in the chaotic inflation models.},
doi = {10.1103/PHYSREVD.81.043524},
url = {https://www.osti.gov/biblio/21413393}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 4,
volume = 81,
place = {United States},
year = {2010},
month = {2}
}