Dynamics and Constraints of the Massive Gravitons Dark Matter Flat Cosmologies

Abstract

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 ($\sim 1-4$) 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.

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

References in corpus (34)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Dark Energy and the Accelerating Universe
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Are f(R) dark energy models cosmologically viable ?
• The halo mass function from the dark ages through the present day
• Confirmation of general relativity on large scales from weak lensing and galaxy velocities
• The 2dF-SDSS LRG and QSO Survey: QSO clustering and the L-z degeneracy
• Cluster Constraints on f(R) Gravity
• Testing LCDM with the Growth Function δ(a): Current Constraints
• The 2dF-SDSS LRG and QSO Survey: The LRG 2-Point Correlation Function and Redshift-Space Distortions
• Structure formation in the presence of dark energy perturbations
• Mapping the Cosmological Expansion
• LXCDM: a cosmon model solution to the cosmological coincidence problem?
• Density perturbations in f(R) gravity theories in metric and Palatini formalisms
• Dark energy as a massive vector field
• The Cluster Mass Function from Weak Gravitational Lensing
• Observational constraints on the linear fluctuation growth rate
• Detecting massive gravitons using pulsar timing arrays
• On using the CMB shift parameter in tests of models of dark energy
• Gödel-type universes in f(R) gravity
• Confronting Dark Energy Models using Galaxy Cluster Number Counts
• Testing Cosmology with Cosmic Sound Waves
• Can Old Galaxies at High Redshifts and Baryon Acoustic Oscillations Constrain H_0?
• Dark energy parameterizations and their effect on dark halos
• A solution for galactic disks with Yukawian gravitational potential
• Simplified Quartessence Cosmology
• Using clusters in SZE + x-ray surveys as an ensemble of rulers to constrain cosmology

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