Light-sheets and Bekenstein's bound

Details Light-sheets and Bekenstein's bound Light-sheets and Bekenstein's bound

2002-10-31

arxiv.org/abs/hep-th/0210295v2

Phys.Rev.Lett. 90 (2003) 121302

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, 1 figure; v2: published version, improved discussion of weak gravity condition, final paragraph added

Scientific paper

10.1103/PhysRevLett.90.121302

From the covariant bound on the entropy of partial light-sheets, we derive a version of Bekenstein's bound: S/M \leq pi x/hbar, 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.

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