Dark matter and dark energy as a effects of Modified Gravity

Details Dark matter and dark energy as a effects of Modified Gravity Dark matter and dark energy as a effects of Modified Gravity

2006-07-28

arxiv.org/abs/astro-ph/0607639v2

ECONFC0602061:09,2006; Int.J.Geom.Meth.Mod.Phys.4:183-196,2007

Astronomy and Astrophysics

Astrophysics

Lectures given at 42nd Karpacz Winter School of Theoretical Physics: Ladek, Poland, 6-11 Feb 2006

Scientific paper

10.1142/S0219887807001898

We explain the effect of dark matter (flat rotation curve) using modified gravitational dynamics. We investigate in this context a low energy limit of generalized general relativity with a nonlinear Lagrangian ${\cal L}\propto R^n$, where $R$ is the (generalized) Ricci scalar and $n$ is parameter estimated from SNIa data. We estimate parameter $\beta$ in modified gravitational potential $V(r) \propto -\frac{1}{r}(1+(\frac{r}{r_c})^{\beta})$. Then we compare value of $\beta$ obtained from SNIa data with $\beta$ parameter evaluated from the best fitted rotation curve. We find $\beta \simeq 0.7$ which becomes in good agreement with an observation of spiral galaxies rotation curve. We also find preferred value of $\Omega_{m,0}$ from the combined analysis of supernovae data and baryon oscillation peak. We argue that although amount of "dark energy" (of non-substantial origin) is consistent with SNIa data and flat curves of spiral galaxies are reproduces in the framework of modified Einstein's equation we still need substantial dark matter. For comparison predictions of the model with predictions of the $\Lambda$CDM concordance model we apply the Akaike and Bayesian information criteria of model selection.

Affiliated with

Also associated with

No associations

Rating

Dark matter and dark energy as a effects of Modified Gravity 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 Dark matter and dark energy as a effects of Modified Gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark matter and dark energy as a effects of Modified Gravity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-251644