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Entropy 2012, 14(4), 736-741; doi:10.3390/e14040736

Radiation Entropy Bound from the Second Law of Thermodynamics

Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
Received: 14 February 2012 / Revised: 22 March 2012 / Accepted: 6 April 2012 / Published: 13 April 2012
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It has been suggested heuristically by Unruh and Wald, and independently by Page, that at given energy and volume, thermal radiation has the largest entropy. The suggestion leads to the corresponding universal bound on entropy of physical systems. Using a gedanken experiment we show that the bound follows from the Second Law of Thermodynamics if the CPT symmetry is assumed and a general condition on matter holds. The experiment suggests that a wide class of Lorentz invariant local quantum field theories obeys a bound on the density of states.
Keywords: entropy; Second Law of Thermodynamics; CPT entropy; Second Law of Thermodynamics; CPT
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Fouxon, I. Radiation Entropy Bound from the Second Law of Thermodynamics. Entropy 2012, 14, 736-741.

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