Reheating-volume measure for random-walk inflation
Abstract
The recently proposed "reheating-volume" (RV) measure promises to solve the long-standing problem of extracting probabilistic predictions from cosmological "multiverse" scenarios involving eternal inflation. I give a detailed description of the new measure and its applications to generic models of eternal inflation of random-walk type. For those models I derive a general formula for RV-regulated probability distributions that is suitable for numerical computations. I show that the results of the RV cutoff in random-walk type models are always gauge-invariant and independent of the initial conditions at the beginning of inflation. In a toy model where equal-time cutoffs lead to the "youngness paradox," the RV cutoff yields unbiased results that are distinct from previously proposed measures.
Cite
@article{arxiv.0805.3940,
title = {Reheating-volume measure for random-walk inflation},
author = {Sergei Winitzki},
journal= {arXiv preprint arXiv:0805.3940},
year = {2009}
}
Comments
Figure 1 updated, version accepted for publication in Phys.Rev.D