Origin of the Thermal Radiation in a Solid-State Analog of a Black-Hole
arXiv:gr-qc/9703076 · doi:10.1103/PhysRevD.62.044044
Abstract
An effective black-hole-like horizon occurs, for electromagnetic waves in matter, at a surface of singular electric and magnetic permeabilities. In a physical dispersive medium this horizon disappears for wave numbers with $k>k_c$. Nevertheless, it is shown that Hawking radiation is still emitted if free field modes with $k>k_c$ are in their ground state.
13 Pages, 3 figures, Revtex with epsf macros