Gravitational waves from oscillon preheating

Zhou, Shuang-Yong and Copeland, Edmund J. and Easther, Richard and Finkel, Hal and Mou, Zong-Gang and Saffin, Paul M. (2013) Gravitational waves from oscillon preheating. Journal of High Energy Physics, 2013 . 26/1-26/18. ISSN 1029-8479

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Oscillons are long-lived, 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 oscillon-dominated 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.

Item Type: Article
Keywords: Cosmology of Theories beyond the SM, Solitons Monopoles and Instantons, Nonperturbative Effects
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1007/JHEP10(2013)026
Depositing User: Saffin, Dr Paul
Date Deposited: 24 Apr 2017 13:19
Last Modified: 13 Oct 2017 01:05

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