Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-03-09
Phys.Rev.Lett. 71 (1993) 666-669
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, in Plain TeX with one figure included, LBL-33754. (Revised version adds an important reference and corrects minor ty
Scientific paper
10.1103/PhysRevLett.71.666
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.
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