Non-linear metric perturbation enhancement of primordial gravitational waves
arXiv:1005.4054 · doi:10.1103/PhysRevLett.105.081301
Abstract
We present the evolution of the full set of Einstein equations during preheating after inflation. We study a generic supersymmetric model of hybrid inflation, integrating fields and metric fluctuations in a 3-dimensional lattice. We take initial conditions consistent with Eintein's constraint equations. The induced preheating of the metric fluctuations is not large enough to backreact onto the fields, but preheating of the scalar modes does affect the evolution of vector and tensor modes. In particular, they do enhance the induced stochastic background of gravitational waves during preheating, giving an energy density in general an order of magnitude larger than that obtained by evolving the tensors fluctuations in an homogeneous background metric. This enhancement can improve the expectations for detection by planned gravitational waves observatories.
5 pages, 4 eps figures, matches Phys. Rev. Lett. version
References in corpus (8)
- Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
- The cosmological gravitational wave background from primordial density perturbations
- Theory and Numerics of Gravitational Waves from Preheating after Inflation
- A Gravitational Wave Background from Reheating after Hybrid Inflation
- Gravitational Wave Production At The End Of Inflation
- A stochastic background of gravitational waves from hybrid preheating
- Gravitational Waves From the End of Inflation: Computational Strategies
- Non-linear Preheating with Scalar Metric Perturbations