TY - JOUR
T1 - Chaotic dynamics in preheating after inflation
AU - Jin, Yoshida
AU - Tsujikawa, Shinji
N1 - Copyright:
Copyright 2006 Elsevier B.V., All rights reserved.
PY - 2006/1/21
Y1 - 2006/1/21
N2 - We study chaotic dynamics in preheating after inflation in which an inflaton φ is coupled to another scalar field χ through an interaction. We first estimate the size of the quasi-homogeneous field χ at the beginning of reheating for large-field inflaton potentials V(φ) ≤ V 0φn by evaluating the amplitude of the χ fluctuations on scales larger than the Hubble radius at the end of inflation. Parametric excitations of the field χ during preheating can give rise to chaos between two dynamical scalar fields. For the quartic potential (n ≤ 4, V0 ≤ λ/4) chaos actually occurs for in a linear regime before which the backreaction of created particles becomes important. This analysis is supported by several different criteria for the existence of chaos. For the quadratic potential (n ≤ 2), the signature of chaos is not found by the time at which the backreaction begins to work, similar to the case of the quartic potential with g2/λ ≫ 1.
AB - We study chaotic dynamics in preheating after inflation in which an inflaton φ is coupled to another scalar field χ through an interaction. We first estimate the size of the quasi-homogeneous field χ at the beginning of reheating for large-field inflaton potentials V(φ) ≤ V 0φn by evaluating the amplitude of the χ fluctuations on scales larger than the Hubble radius at the end of inflation. Parametric excitations of the field χ during preheating can give rise to chaos between two dynamical scalar fields. For the quartic potential (n ≤ 4, V0 ≤ λ/4) chaos actually occurs for in a linear regime before which the backreaction of created particles becomes important. This analysis is supported by several different criteria for the existence of chaos. For the quadratic potential (n ≤ 2), the signature of chaos is not found by the time at which the backreaction begins to work, similar to the case of the quartic potential with g2/λ ≫ 1.
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U2 - 10.1088/0264-9381/23/2/006
DO - 10.1088/0264-9381/23/2/006
M3 - Article
AN - SCOPUS:32644434018
VL - 23
SP - 353
EP - 371
JO - Classical and Quantum Gravity
JF - Classical and Quantum Gravity
SN - 0264-9381
IS - 2
ER -