Nonlinear preheating with scalar metric perturbations
- Departamento de Fisica Teorica y del Cosmos, Universidad de Granada, Granada-18071 (Spain)
- LPSC, Universite Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut Polytechnique de Grenoble, Grenoble (France)
We have studied preheating of field perturbations in a 3-dimensional lattice including the effect of scalar metric perturbations in two generic models of inflation: chaotic inflation with a quartic potential and standard hybrid inflation. We have prepared the initial state for the classical evolution of the system with vanishing vector and tensor metric perturbations, consistent with the constraint equations, the energy and momentum constraints. The nonlinear evolution inevitably generates vector and tensor modes, and this reflects on how well the constraint equations are fulfilled during the evolution. The induced preheating of the scalar metric perturbations is not large enough to backreact onto the fields, but it could affect the evolution of vector and tensor modes. This is the case in hybrid inflation for some values of the coupling g and the height of potential V{sub 0}{sup 1/4}. For example with V{sub 0}{sup 1/4}{approx_equal}10{sup 15} GeV, preheating of scalar perturbations is such that their source term in the evolution equation for tensor and vector fluctuations becomes comparable to that of the field anisotropic stress.
- OSTI ID:
- 21035808
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevD.77.023520; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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