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Title: Baryon number nonconservation and phase transitions at preheating

Abstract

Certain inflation models undergo pre-heating, in which inflaton oscillations can drive parametric resonance instabilities. We discuss several phenomena stemming from such instabilities, especially in weak-scale models; generically, these involve energizing a resonant system so that it can evade tunneling by crossing barriers classically. One possibility is a spontaneous change of phase from a lower-energy vacuum state to one of higher energy, as exemplified by an asymmetric double-well potential with different masses in each well. If the lower well is in resonance with oscillations of the potential, a system can be driven resonantly to the upper well and stay there (except for tunneling) if the upper well is not resonant. Another example occurs in hybrid inflation models where the Higgs field is resonant; the Higgs oscillations can be transferred to electroweak (EW) gauge potentials, leading to rapid transitions over sphaleron barriers and consequent B+L violation. Given an appropriate CP-violating seed, we find that preheating can drive a time-varying condensate of Chern-Simons number over large spatial scales; this condensate evolves by oscillation as well as decay into modes with shorter spatial gradients, eventually ending up as a condensate of sphalerons. We study these examples numerically and to some extent analytically. The emphasismore » in the present paper is on the generic mechanisms, and not on specific preheating models; these will be discussed in a later paper. (c) 2000 The American Physical Society.« less

Authors:
 [1];  [1];  [2]
  1. Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20216448
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 61; Journal Issue: 10; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; INFLATIONARY UNIVERSE; PHASE TRANSFORMATIONS; CONSERVATION LAWS; BARYON NUMBER; CP INVARIANCE; GRAND UNIFIED THEORY; THEORETICAL DATA

Citation Formats

Cornwall, John M., Kusenko, Alexander, and RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973. Baryon number nonconservation and phase transitions at preheating. United States: N. p., 2000. Web. doi:10.1103/PhysRevD.61.103510.
Cornwall, John M., Kusenko, Alexander, & RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973. Baryon number nonconservation and phase transitions at preheating. United States. doi:10.1103/PhysRevD.61.103510.
Cornwall, John M., Kusenko, Alexander, and RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973. Mon . "Baryon number nonconservation and phase transitions at preheating". United States. doi:10.1103/PhysRevD.61.103510.
@article{osti_20216448,
title = {Baryon number nonconservation and phase transitions at preheating},
author = {Cornwall, John M. and Kusenko, Alexander and RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973},
abstractNote = {Certain inflation models undergo pre-heating, in which inflaton oscillations can drive parametric resonance instabilities. We discuss several phenomena stemming from such instabilities, especially in weak-scale models; generically, these involve energizing a resonant system so that it can evade tunneling by crossing barriers classically. One possibility is a spontaneous change of phase from a lower-energy vacuum state to one of higher energy, as exemplified by an asymmetric double-well potential with different masses in each well. If the lower well is in resonance with oscillations of the potential, a system can be driven resonantly to the upper well and stay there (except for tunneling) if the upper well is not resonant. Another example occurs in hybrid inflation models where the Higgs field is resonant; the Higgs oscillations can be transferred to electroweak (EW) gauge potentials, leading to rapid transitions over sphaleron barriers and consequent B+L violation. Given an appropriate CP-violating seed, we find that preheating can drive a time-varying condensate of Chern-Simons number over large spatial scales; this condensate evolves by oscillation as well as decay into modes with shorter spatial gradients, eventually ending up as a condensate of sphalerons. We study these examples numerically and to some extent analytically. The emphasis in the present paper is on the generic mechanisms, and not on specific preheating models; these will be discussed in a later paper. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevD.61.103510},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 10,
volume = 61,
place = {United States},
year = {2000},
month = {5}
}