Entropy and area

Mark Srednicki
Phys. Rev. Lett. 71, 666 – Published 2 August 1993
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Abstract

The ground-state density matrix for a massless free field is traced over the degrees of freedom residing inside an imaginary sphere; the resulting entropy is shown to be proportional to the area (and not the volume) of the sphere. Possible connections with the physics of black holes are discussed.

  • Received 15 March 1993

DOI:https://doi.org/10.1103/PhysRevLett.71.666

©1993 American Physical Society

Authors & Affiliations

Mark Srednicki

  • Center for Particle Astrophysics, University of California, Berkeley, California 94720
  • Theoretical Physics Group, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720

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Vol. 71, Iss. 5 — 2 August 1993

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