Gravitational waves from oscillon preheating
Abstract
Oscillons are longlived, localized excitations of nonlinear scalar fields which may be copiously produced during preheating after inflation, leading to a possible oscillon dominated phase in the early Universe. For example, this can happen after axion monodromy inflation, on which we run our simulations. We investigate the stochastic gravitational wave background associated with an oscillondominated phase. An isolated oscillon is spherically symmetric and does not radiate gravitational waves, and we show that the flux of gravitational radiation generated between oscillons is also small. However, a significant stochastic gravitational wave background may be generated during preheating itself (i.e, when oscillons are forming), and in this case the characteristic size of the oscillons is imprinted on the gravitational wave power spectrum, which has multiple, distinct peaks.
 Publication:

Journal of High Energy Physics
 Pub Date:
 October 2013
 DOI:
 10.1007/JHEP10(2013)026
 arXiv:
 arXiv:1304.6094
 Bibcode:
 2013JHEP...10..026Z
 Keywords:

 Cosmology of Theories beyond the SM;
 Solitons Monopoles and Instantons;
 Nonperturbative Effects;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 19 pages, 5 figures, JHEP version