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Bloch-Nordsieck thermometers: One-loop exponentiation in finite temperature QED

Gupta, Sourendu and Indumathi, D and Mathews, Prakash and Ravindran, V (1996) Bloch-Nordsieck thermometers: One-loop exponentiation in finite temperature QED. In: Nuclear Physics B, 458 (1-2). pp. 189-212.

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Official URL: http://dx.doi.org/10.1016/0550-3213(95)00558-7


We study the scattering of hard external particles in a heat bath in a real-time formalism for finite temperature QED. We investigate the distribution of the 4-momentum difference of initial and final hard particles in a fully covariant manner when the scale of the process, Q, is much larger than the temperature, T. Our computations are valid for all T subject to this constraint. We exponentiate the leading infra-red term at one-loop order through a resummation of soft (thermal) photon emissions and absorptions. For T > 0, we find that tensor structures arise which are not present at T = 0. These carry thermal signatures. As a result, external particles can serve as thermometers introduced into the heat bath. We investigate the phase space origin of log (Q/M) and log (Q/T) terms.

Item Type: Journal Article
Publication: Nuclear Physics B
Publisher: Elsevier science
Additional Information: Copyright of this article belongs to Elsevier science.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Theoretical Studies (Ceased to exist at the end of 2003)
Date Deposited: 20 Apr 2011 09:54
Last Modified: 20 Apr 2011 09:54
URI: http://eprints.iisc.ac.in/id/eprint/37054

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