Back Reaction And Local Cosmological Expansion Rate

Details Back Reaction And Local Cosmological Expansion Rate Back Reaction And Local Cosmological Expansion Rate

2002-04-23

arxiv.org/abs/gr-qc/0204074v1

Phys.Rev.D66:123507,2002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, No figures

Scientific paper

10.1103/PhysRevD.66.123507

We calculate the back reaction of cosmological perturbations on a general relativistic variable which measures the local expansion rate of the Universe. Specifically, we consider a cosmological model in which matter is described by a single field. We analyze back reaction both in a matter dominated Universe and in a phase of scalar field-driven chaotic inflation. In both cases, we find that the leading infrared terms contributing to the back reaction vanish when the local expansion rate is measured at a fixed value of the matter field which is used as a clock, whereas they do not appear to vanish if the expansion rate is evaluated at a fixed value of the background time. We discuss possible implications for more realistic models with a more complicated matter sector.

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