Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-09-02
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, LaTeX with 2 figures. Contributed talk at "Strong and Electroweak Matter '97", Eger, Hungary, May 21-25, 1997
Scientific paper
Photons in blackbody radiation have non-zero interactions due to their couplings to virtual electron-positron pairs in the vacuum. For temperatures much less than the electron mass $m$ these effects can be described by an effective theory incorporating the Uehling and Euler-Heisenberg interactions as dominant terms. By a redefinition of the electromagnetic field, the Uehling term is shown not to contribute. The Stefan-Boltzmann energy is then modified by a term proportional with $T^8/m^4$ in agreement with the semi-classical result of Barton. The same effects give a speed of light smaller than one at non-zero temperatures as has also recently been derived using full QED.
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