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Raphael Bousso

Publications and source records attributed to Raphael Bousso.

3 recordsLinked to original sources
PubMed2006

Holographic probabilities in eternal inflation.

In the global description of eternal inflation, probabilities for vacua are notoriously ambiguous. The local point of view is preferred by holography and naturally picks out a simple probability measure. It is insensitive to large expansion factors or lifetimes and so resolves a recently noted paradox. Any cosmological measure must be complemented with the probability for observers to emerge in a given vacuum. In lieu of anthropic criteria, I propose to estimate this by the entropy that can be produced in a local patch. This allows for prior-free predictions.

Journal Article↗
PubMed2003

Light sheets and Bekenstein's entropy bound.

From the covariant bound on the entropy of partial light sheets, we derive a version of Bekenstein's bound: S/M<or=pix/ variant Planck's over 2pi, where S, M, and x are the entropy, total mass, and width of any isolated, weakly gravitating system. Because x can be measured along any spatial direction, the bound becomes unexpectedly tight in thin systems. Our result completes the identification of older entropy bounds as special cases of the covariant bound. Thus, light sheets exhibit a connection between information and geometry far more general, but in no respect weaker, than that initially revealed by black hole thermodynamics.

Journal Article↗