f(R) theories of gravity in Palatini approach matched with observations

Details f(R) theories of gravity in Palatini approach matched with observations f(R) theories of gravity in Palatini approach matched with observations

2004-10-06

arxiv.org/abs/astro-ph/0410135v1

Gen.Rel.Grav. 38 (2006) 711-734

Astronomy and Astrophysics

Astrophysics

14 pages, 8 figures, submitted to Physical Review D

Scientific paper

10.1007/s10714-006-0261-x

We investigate the viability of f(R) theories in the framework of the Palatini approach as solutions to the problem of the observed accelerated expansion of the universe. Two physically motivated popular choices for f(R) are considered: power law, f(R) = \beta R^n, and logarithmic, f(R) = \alpha \ln{R}. Under the Palatini approach, both Lagrangians give rise to cosmological models comprising only standard matter and undergoing a present phase of accelerated expansion. We use the Hubble diagram of type Ia Supernovae and the data on the gas mass fraction in relaxed galaxy clusters to see whether these models are able to reproduce what is observed and to constrain their parameters. It turns out that they are indeed able to fit the data with values of the Hubble constant and of the matter density parameter in agreement with some model independent estimates, but the today deceleration parameter is higher than what is measured in the concordance LambdaCDM model.

Affiliated with

Also associated with

No associations

Rating

f(R) theories of gravity in Palatini approach matched with observations 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 f(R) theories of gravity in Palatini approach matched with observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and f(R) theories of gravity in Palatini approach matched with observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-169339