12 papers
The dynamics of cosmological perturbations in thermal theory
Herbert Nachbagauer, Anton K. Rebhan, Dominik J. Schwarz
Using a recent thermal-field-theory approach to cosmological perturbations, the exact solutions that were found for collisionless ultrarelativistic matter are generalized to includ…
The gravitational polarization tensor of thermal theory
H. Nachbagauer, A. K. Rebhan, D. J. Schwarz
The low-momentum structure of the gravitational polarization tensor of an ultrarelativistic plasma of scalar particles with interactions is evaluated in a two-loop calculati…
The Infrared Sensitivity of Screening and Damping in a Quark-Gluon Plasma
F. Flechsig, A. K. Rebhan, H. Schulz
All the next-to-leading order contributions to the quasi-particle dispersion laws of a quark-gluon plasma which due to infrared singularities are sensitive to the magnetic-mass sca…
Effects of weak self-interactions in a relativistic plasma on cosmological perturbations
H. Nachbagauer, A. K. Rebhan, D. J. Schwarz
The exact solutions for linear cosmological perturbations which have been obtained for collisionless relativistic matter within thermal field theory are extended to a self-interact…
Kinetic vs. Thermal-Field-Theory Approach to Cosmological Perturbations
Anton K. Rebhan, Dominik J. Schwarz
A closed set of equations for the evolution of linear perturbations of homogeneous, isotropic cosmological models can be obtained in various ways. The simplest approach is to assum…
Gauge-independent extraction of the next-to-leading-order Debye mass from the gluon propagator
A. K. Rebhan
It is shown that by defining the Debye mass through the relevant pole of the static gluon propagator rather than the zero-momentum limit of the time-time component of the gluon sel…