Interacting Kasner-type cosmologies
arXiv:1101.2147 · doi:10.1007/s10509-011-0596-y
Abstract
It is well known that Kasner-type cosmologies provide a useful framework for analyzing the three-dimensional anisotropic expansion because of the simplification of the anisotropic dynamics. In this paper relativistic multi-fluid Kasner-type scenarios are studied. We first consider the general case of a superposition of two ideal cosmic fluids, as well as the particular cases of non-interacting and interacting ones, by introducing a phenomenological coupling function . For two-fluid cosmological scenarios there exist only cosmological scaling solutions, while for three-fluid configurations there exist not only cosmological scaling ones, but also more general solutions. In the case of triply interacting cosmic fluids we can have energy transfer from two fluids to a third one, or energy transfer from one cosmic fluid to the other two. It is shown that by requiring the positivity of energy densities there always is a matter component which violates the dominant energy condition in this kind of anisotropic cosmological scenarios.
Accepted for publication in Astrophysics &Space Science, 8 pages
References in corpus (14)
- The shape of the SDSS DR5 galaxy power spectrum
- The new form of the equation of state for dark energy fluid and accelerating universe
- Cosmologies with Energy Exchange
- Cosmological coincidence problem in interacting dark energy models
- Interacting Phantom Energy
- Interacting models of soft coincidence
- Dynamics of Interacting Quintessence Models: Observational Constraints
- Scale Factor Dependent Equations of State for Curvature Inspired Dark Energy, Phantom Barrier and Late Cosmic Acceleration
- Dark energy interacting with two fluids
- Interacting cosmic fluids in power-law Friedmann-Robertson-Walker cosmological models
- Evolution of high-frequency gravitational waves in some cosmological models
- 4D spacetimes embedded in 5D light-like Kasner universes
- On the "scattering law" for Kasner parameters appearing in asymptotics of an exact S-brane solution
- Electrocardiogram of the Mixmaster Universe