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Phys. Rev. D 53, 882 - 890 (1996)

Gravitational polarization tensor of thermal λφ4 theory

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Herbert Nachbagauer
Laboratoire de Physique Théorique ENSLAPP, B.P. 110, F-74941 Annecy-le-Vieux Cedex, France

Anton K. Rebhan
DESY, Gruppe Theorie, Notkestrasse 85, D-22603 Hamburg, Germany

Dominik J. Schwarz
Institut für Theoretische Physik, Technische Universität Wien, Wiedner Hauptstrasse 8-10/136, A-1040 Wien, Austria

Received 19 July 1995

The low-momentum structure of the gravitational polarization tensor of an ultrarelativistic plasma of scalar particles with λφ4 interactions is evaluated in a two-loop calculation up to and including order λ3/2. This turns out to require an improved perturbation theory which resums a local thermal mass term as well as nonlocal hard-thermal-loop vertices of scalar and gravitational fields. © 1996 The American Physical Society.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevD.53.882
DOI: 10.1103/PhysRevD.53.882
PACS: 11.10.Wx, 04.62.+v, 52.60.+h

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