5 papers
Gas models for inflation and quintessence
W. Zimdahl, A. B. Balakin, D. J. Schwarz +1
Specific internal self-interactions in gaseous cosmic fluids are shown to give rise to effective negative pressures which may violate the strong energy condition. On this basis we…
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…
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…