Nonlinear Metric Perturbation Enhancement of Primordial Gravitational Waves

Journal Article · Fri Aug 20 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.081301· OSTI ID:21470966

Bastero-Gil, M ^[1]; Macias-Perez, J; Santos, D ^[2]

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1. Departamento de Fisica Teorica y del Cosmos, Universidad de Granada, Granada-18071 (Spain)
2. Laboratoire de Physique Subatomique et Cosmologie, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble, Grenoble-38026 (France)

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 Einstein'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 tensor fluctuations in an homogeneous background metric. This enhancement can improve the expectations for detection by planned gravitational wave observatories.

• OSTI ID: 21470966
• Journal Information: Physical Review Letters, Vol. 105, Issue 8; Other Information: DOI: 10.1103/PhysRevLett.105.081301; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DISTURBANCES
EINSTEIN FIELD EQUATIONS
ENERGY DENSITY
FLUCTUATIONS
GRAVITATIONAL WAVES
HEAT TREATMENTS
INFLATIONARY UNIVERSE
LATTICE FIELD THEORY
METRICS
NONLINEAR PROBLEMS
SCALARS
STOCHASTIC PROCESSES
SUPERSYMMETRY
THREE-DIMENSIONAL CALCULATIONS
VECTORS
CONSTRUCTIVE FIELD THEORY
COSMOLOGICAL MODELS
EQUATIONS
FIELD EQUATIONS
FIELD THEORIES
MATHEMATICAL MODELS
QUANTUM FIELD THEORY
SYMMETRY
TENSORS
VARIATIONS