Time-reparametrization invariance in eternal inflation

Details Time-reparametrization invariance in eternal inflation Time-reparametrization invariance in eternal inflation

2005-04-19

arxiv.org/abs/gr-qc/0504084v2

Phys.Rev. D71 (2005) 123507

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

version accepted by Phys.Rev.D, minor additions and clarifications suggested by the referee

Scientific paper

10.1103/PhysRevD.71.123507

I address some recently raised issues regarding the time-parametrization dependence in stochastic descriptions of eternal inflation. To clarify the role of the choice of the time gauge, I show examples of gauge-dependent as well as gauge-independent statements about physical observables in eternally inflating spacetimes. In particular, the relative abundance of thermalized and inflating regions is highly gauge-dependent. The unbounded growth of the 3-volume of the inflating regions is found in certain time gauges, such as the proper time or the scale factor gauge. Yet in the same spacetimes there exist time foliations with a finite and monotonically decreasing 3-volume, which I demonstrate by an explicit construction. I also show that there exists no "correct" choice of the time gauge that would yield an unbiased stationary probability distribution for observables in thermalized regions.

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