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Gravitational waves from oscillon preheating

Zhou, Shuang-Yong; Copeland, Edmund J.; Easther, Richard; Finkel, Hal; Mou, Zong-Gang; Saffin, Paul M.

Authors

Shuang-Yong Zhou

Edmund J. Copeland

Richard Easther

Hal Finkel

Zong-Gang Mou

Paul M. Saffin

Abstract

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.

Journal Article Type Article
Publication Date Oct 3, 2013
Journal Journal of High Energy Physics
Electronic ISSN 1029-8479
Publisher Humana Press
Peer Reviewed Peer Reviewed
Volume 2013
Article Number 26
Institution Citation Zhou, S., Copeland, E. J., Easther, R., Finkel, H., Mou, Z., & Saffin, P. M. (2013). Gravitational waves from oscillon preheating. Journal of High Energy Physics, 2013, doi:10.1007/JHEP10(2013)026
DOI https://doi.org/10.1007/JHEP10%282013%29026
Keywords Cosmology of Theories beyond the SM, Solitons Monopoles and Instantons, Nonperturbative Effects
Publisher URL http://link.springer.com/article/10.1007%2FJHEP10%282013%29026
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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