APS » PROLA » Phys. Rev. D » Volume 54 » Issue 12
< Previous article | Next article >

Phys. Rev. D 54, 7172 - 7180 (1996)

Stochastic approach to inflation: Classicality conditions

Download: PDF (187 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

M. Bellini
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, (7600) Mar del Plata, Buenos Aires, Argentina

H. Casini and R. Montemayor
Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica-Universidad Nacional de Cuyo, E. Bustillo 9500, (8400) San Carlos de Bariloche, Río Negro, Argentina

P. Sisterna
Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Funes 3350, (7600) Mar del Plata, Buenos Aires, Argentina

Received 25 March 1996

The stochastic approach to inflation relies on one key assumption, the emergence of a long-wave classical field that drives the inflation and is subject to a shortwave classical noise. In this work we consider explicitly the potential that acts on the inflaton field, and analyze classicality conditions that must be satisfied to have an effective classical stochastic approach. When these hold, the dynamics is given by a two-dimensional classical Fokker-Planck equation. We develop some examples, already widely considered in different approaches, and find a very suggestive result, which is the damping of the quantum fluctuations by the effect of the inflaton interaction potential.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.54.7172
DOI: 10.1103/PhysRevD.54.7172
PACS: 98.80.Cq, 04.62.+v

[ Abstract  |  Previous article  |  Next article  |  Issue 12 ]