Crossing $w=-1$ by a single scalar field coupling with matter and the observational constraints

Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

12 pages, 3 figures, the published version

Scientific paper

10.1088/0264-9381/28/5/055006

Motivated by Yang-Mills dark energy model, we propose a new model by introducing a logarithmic correction. we find that this model can avoid the coincidence problem naturally and gives an equation of state $w$ smoothly crossing -1 if an interaction between dark energy and dark matter exists. It has a stable tracker solution as well. To confront with observations based on the combined data of SNIa, BAO, CMB and Hubble parameter, we obtain the best fit values of the parameters with $1\sigma, 2\sigma, 3\sigma$ errors for the noncoupled model: $\Omega_m=0.276\pm0.008^{+0.016+0.024}_{-0.015-0.022}$, $h=0.699\pm0.003\pm0.006\pm0.008$, and for the coupled model with a decaying rate $\gamma=0.2$: $\Omega_m=0.291\pm0.004^{+0.008+0.012}_{-0.007-0.011}$, $h=0.701\pm0.002\pm0.005\pm0.007$. In particular, it is found that the non-coupled model has a dynamic evolution almost undistinguishable to $\Lambda$CDM at the late-time Universe.

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

Crossing $w=-1$ by a single scalar field coupling with matter and the observational constraints 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 Crossing $w=-1$ by a single scalar field coupling with matter and the observational constraints, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crossing $w=-1$ by a single scalar field coupling with matter and the observational constraints will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-544358

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