5 papers · 1 filter
Exact solutions of Einstein's equations with ideal gas sources
Roberto A. Sussman, Josep Triginer
We derive a new class of exact solutions characterized by the Szekeres-Szafron metrics (of class I), admitting in general no isometries. The source is a fluid with viscosity but ze…
Density perturbations with relativistic thermodynamics
Roy Maartens, Josep Triginer
We investigate cosmological density perturbations in a covariant and gauge-invariant formalism, incorporating relativistic causal thermodynamics to give a self-consistent descripti…
Collisional equilibrium, particle production and the inflationary universe
Winfried Zimdahl, Josep Triginer, Diego Pavon
Particle production processes in the expanding universe are described within a simple kinetic model. The equilibrium conditions for a Maxwell-Boltzmann gas with variable particle n…
Qualitative Analysis of Causal Cosmological Models
Vicenç Mendez, Josep Triginer
The Einstein's field equations of Friedmann-Robertson-Walker universes filled with a dissipative fluid described by both the {\em truncated} and {\em non-truncated} causal transpor…
Kinetic theory for particle production
Josep Triginer, Winfried Zimdahl, Diego Pavon
Recently, the phenomenological description of cosmological particle production processes in terms of effective viscous pressures has attracted some attention. Using a simple creati…