Possible Constraints on the Duration of Inflationary Expansion from Quantum Stress Tensor Fluctuations

Details Possible Constraints on the Duration of Inflationary Expansion from Quantum Stress Tensor Fluctuations Possible Constraints on the Duration of Inflationary Expansion from Quantum Stress Tensor Fluctuations

2006-07-31

arxiv.org/abs/gr-qc/0608002v2

Phys.Rev.D75:103502,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, no figures; Sect. IV rewritten and expanded, several comments and references added

Scientific paper

10.1103/PhysRevD.75.103502

We discuss the effect of quantum stress tensor fluctuations in deSitter spacetime upon the expansion of a congruence of timelike geodesics. We treat a model in which the expansion fluctuations begin on a given hypersurface in deSitter spacetime, and find that this effect tends to grow, in contrast to the situation in flat spacetime. This growth potentially leads to observable consequences in inflationary cosmology in the form of density perturbations which depend upon the duration of the inflationary period. In the context of our model, the effect may be used to place upper bounds on this duration.

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