Wednesday, April 25, 2012

1202.1407 (Spiros Cotsakis et al.)

Singularities in cosmologies with interacting fluids    [PDF]

Spiros Cotsakis, Georgia Kittou
We study the dynamics near finite-time singularities of flat isotropic universes filled with two interacting but otherwise arbitrary perfect fluids. The overall dynamical picture reveals a variety of asymptotic solutions valid locally around the spacetime singularity. We find the attractor of all solutions with standard decay, and for `phantom' matter asymptotically at early times. We give a number of special asymptotic solutions describing universes collapsing to zero size and others ending at a big rip singularity. We also find a very complicated singularity corresponding with a logarithmic branch point that resembles of cyclic universe, and give an asymptotic local series representation of the general solution in the neighborhood of infinity.
View original: http://arxiv.org/abs/1202.1407

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