Universality in grey-body radiance: Extending Kirchoff's law to the statistics of quanta

Journal Article · Mon Apr 18 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.2512· OSTI ID:7281182

Bekenstein, J D ^[1]; Schiffer, M ^[2]

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1. Racah Institute of Physics, Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 (Israel)
2. Theory Division, CERN, CH1211 Geneva 23 (Switzerland) Instituto de Fisicsa, Universidade de Sao Paulo, 01498-970 Sao Paulo, Sao Paulo (Brazil)

An ideal grey body is a macroscopic object with definite temperature which absorbs only a fraction of the radiation incident on it. Assuming that a grey body always emits in a mixed state, and that the radiation density matrix factors into matrices for the various frequency modes, we employ general arguments to derive the complete statistic of grey-body radiance elicited by incident radiation. These depend only on the temperature and the absorptivities for the various frequencies (hence are of universal form), and coincide with the statistics of black-hole radiance first derived a decade and a half ago.

• OSTI ID: 7281182
• Journal Information: Physical Review Letters; (United States), Vol. 72:16; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
RADIATIONS
STATISTICAL MECHANICS
BLACK HOLES
DENSITY MATRIX
MIXED STATE
TEMPERATURE DEPENDENCE
MATRICES
MECHANICS
661300* - Other Aspects of Physical Science- (1992-)