Scientific Calendar Event



Starts 3 Jun 2013 17:30
Ends 3 Jun 2013 20:00
Central European Time
ICTP
Leonardo da Vinci Building Luigi Stasi Seminar Room
Strada Costiera, 11 I - 34151 Trieste (Italy)
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. 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 by pair-wise (and higher order) interactions is very small. However, a significant stochastic gravitational wave background may be generated during preheating itself, and in this case the characteristic size of the oscillons is imprinted on the gravitational wave power spectrum, which has multiple, distinct peaks.