Squeezed Thermal Vacuum and the Maximum Scale for Inflation

Details Squeezed Thermal Vacuum and the Maximum Scale for Inflation Squeezed Thermal Vacuum and the Maximum Scale for Inflation

1993-06-10

arxiv.org/abs/gr-qc/9306015v1

Phys.Rev.D48:439-443,1993

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, plain tex, three figures available upon request, to appear in Phys.Rev.D, CERN-TH.6836/93

Scientific paper

10.1103/PhysRevD.48.R439

We consider the stimulated emission of gravitons from an initial state of thermal equilibrium, under the action of the cosmic gravitational background field. We find that the low-energy graviton spectrum is enhanced if compared with spontaneous creation from the vacuum; as a consequence, the scale of inflation must be lowered, in order not to exceed the observed CMB quadrupole anisotropy. This effect is particularly important for models based on a symmetry-breaking transition which require, as initial condition, a state of thermal equilibrium at temperatures of the order of the inflation scale.

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