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Stochastic Background of Gravitational Waves from Fermions

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Title: Stochastic Background of Gravitational Waves from Fermions
Author: Enqvist, Kari; G. Figueroa, Daniel; Meriniemi, Tuukka
Citation: Enqvist , K , G. Figueroa , D & Meriniemi , T 2012 , ' Stochastic Background of Gravitational Waves from Fermions ' Physical Review D : Particles, Fields, Gravitation and Cosmology , vol 86 , no. 06 , pp. 061301 .
Belongs to series: Physical Review D : Particles, Fields, Gravitation and Cosmology
ISSN: 1550-7998
Abstract: Preheating and other particle production phenomena in the early Universe can give rise to high- energy out-of-equilibrium fermions with an anisotropic stress. We develop a formalism to calculate the spectrum of gravitational waves due to fermions, and apply it to a variety of scenarios after inflation. We pay particular attention to regularization issues. We show that fermion production sources a stochastic background of gravitational waves with a significant amplitude, but we find that typical frequencies of this new background are not within the presently accessible direct detec- tion range. However, small-coupling scenarios might still produce a signal observable by planned detectors, and thus open a new window into the physics of the very early Universe.
Peer review status: Peer reviewed
URI: http://hdl.handle.net/10138/37183
Date: 2012-09-05

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