Gravitational waves from oscillon preheating
Zhou, Shuang-Yong; Copeland, Edmund J.; Easther, Richard; Finkel, Hal; Mou, Zong-Gang; Saffin, Paul M.
Edmund J. Copeland
Paul M. Saffin
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|
|Peer Reviewed||Peer Reviewed|
|APA6 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|
|Keywords||Cosmology of Theories beyond the SM, Solitons Monopoles and Instantons, Nonperturbative Effects|
|Copyright Statement||Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf|
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf