Gravitational waves from oscillon preheating

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

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.

Citation

Zhou, S.-Y., Copeland, E. J., Easther, R., Finkel, H., Mou, Z.-G., & Saffin, P. M. (2013). Gravitational waves from oscillon preheating. Journal of High Energy Physics, 2013, Article 26. https://doi.org/10.1007/JHEP10%282013%29026

• Journal Article Type: Article
• Acceptance Date: Aug 29, 2013
• Publication Date: Oct 3, 2013
• Deposit Date: Apr 24, 2017
• Publicly Available Date: Apr 24, 2017
• Journal: Journal of High Energy Physics
• Electronic ISSN: 1029-8479
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 2013
• Article Number: 26
• DOI: https://doi.org/10.1007/JHEP10%282013%29026
• Keywords: Cosmology of Theories beyond the SM, Solitons Monopoles and Instantons, Nonperturbative Effects
• Public URL: https://nottingham-repository.worktribe.com/output/718999
• Publisher URL: http://link.springer.com/article/10.1007%2FJHEP10%282013%29026
• Contract Date: Apr 24, 2017