Rip/singularity free cosmology models with bulk viscosity

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

9 pages, 6 figures, submitted to EPJ-C

Scientific paper

In this paper we present two concrete models of non-perfect fluid with bulk viscosity to interpret the observed cosmic accelerating expansion phenomena, avoiding the introduction of exotic dark energy. The first model we inspect has a viscosity of the form ${\zeta} = {\zeta}_0 + ({\zeta}_1-{\zeta}_2q)H$ by taking into account of the decelerating parameter q, and the other model is of the form ${\zeta} = {\zeta}_0 + {\zeta}_1H + {\zeta}_2H^2$. We give out the exact solutions of such models and further constrain them with the latest Union2 data as well as the currently observed Hubble-parameter dataset (OHD), then we discuss the fate of universe evolution in these models, which confronts neither future singularity nor little/pseudo rip. From the resulting curves by best fittings we find a much more flexible evolution processing due to the presence of viscosity while being consistent with the observational data in the region of data fitting. With the bulk viscosity considered, a more realistic universe scenario is characterized comparable with the {\Lambda}CDM model but without introducing the mysterious dark energy.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Rip/singularity free cosmology models with bulk viscosity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Rip/singularity free cosmology models with bulk viscosity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rip/singularity free cosmology models with bulk viscosity will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-415309

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.