Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies

Details Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies

2011-03-08

arxiv.org/abs/1103.1464v2

Phys.Rev.D83:103506,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in Physical Review D (12 pages, 4 figures)

Scientific paper

10.1103/PhysRevD.83.103506

We discuss the dynamics of the universe within the framework of Massive Graviton Dark Matter scenario (MGCDM) in which gravitons are geometrically treated as massive particles. In this modified gravity theory, the main effect of the gravitons is to alter the density evolution of the cold dark matter component in such a way that the Universe evolves to an accelerating expanding regime, as presently observed. Tight constraints on the main cosmological parameters of the MGCDM model are derived by performing a joint likelihood analysis involving the recent supernovae type Ia data, the Cosmic Microwave Background (CMB) shift parameter and the Baryonic Acoustic Oscillations (BAOs) as traced by the Sloan Digital Sky Survey (SDSS) red luminous galaxies. The linear evolution of small density fluctuations is also analysed in detail. It is found that the growth factor of the MGCDM model is slightly different ($\sim1-4%$) from the one provided by the conventional flat $\Lambda$CDM cosmology. The growth rate of clustering predicted by MGCDM and $\Lambda$CDM models are confronted to the observations and the corresponding best fit values of the growth index ($\gamma$) are also determined. By using the expectations of realistic future X-ray and Sunyaev-Zeldovich cluster surveys we derive the dark-matter halo mass function and the corresponding redshift distribution of cluster-size halos for the MGCDM model. Finally, we also show that the Hubble flow differences between the MGCDM and the $\Lambda$CDM models provide a halo redshift distribution departing significantly from the ones predicted by other DE models. These results suggest that the MGCDM model can observationally be distinguished from $\Lambda$CDM and also from a large number of dark energy models recently proposed in the literature.

Affiliated with

Also associated with

No associations

Rating

Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies 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 Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-82191