Non-linear metric perturbation enhancement of primordial gravitational waves

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.

arXiv comment5 pages, 4 eps figures, matches Phys. Rev. Lett. version

References in corpus (21)

• Towards the Theory of Reheating After Inflation
• On the Numerical Integration of Einstein's Field Equations
• Universe Reheating after Inflation
• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• The cosmological gravitational wave background from primordial density perturbations
• Dynamics of Symmetry Breaking and Tachyonic Preheating
• Tachyonic Instability and Dynamics of Spontaneous Symmetry Breaking
• Theory and Numerics of Gravitational Waves from Preheating after Inflation
• CMB polarization from secondary vector and tensor modes
• 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
• Symmetry Breaking and False Vacuum Decay after Hybrid Inflation
• Gravity Waves from Tachyonic Preheating after Hybrid Inflation
• Preheating in an Expanding Universe: Analytic Results for the Massless Case
• Gravitational Waves From the End of Inflation: Computational Strategies
• Preheating in Supersymmetric Hybrid Inflation
• When can preheating affect the CMB?
• Gravitational waves generated by second order effects during inflation
• Advantages of modified ADM formulation: constraint propagation analysis of Baumgarte-Shapiro-Shibata-Nakamura system
• Non-linear Preheating with Scalar Metric Perturbations

Cited by in corpus (10)

• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• The Art of Lattice and Gravity Waves from Preheating
• PSpectRe: A Pseudo-Spectral Code for (P)reheating
• On the Anisotropy of the Gravitational Wave Background from Massless Preheating
• On the Transverse-Traceless Projection in Lattice Simulations of Gravitational Wave Production
• Preheating in Full General Relativity
• Nonlinear preheating with nonminimally coupled scalar fields in the Starobinsky model
• Gravitational Waves from Fully General Relativistic Oscillon Preheating
• Gauge preheating with full general relativity
• Cosmology using numerical relativity