Cosmological bounds on oscillating dark energy models

Deepak Jain; Abha Dev; J. S. Alcaniz

doi:10.1016/j.physletb.2007.09.023

Home/Archive/arXiv

arXiv · 0709.4234

Cosmological bounds on oscillating dark energy models

Deepak Jain·Abha Dev·J. S. Alcaniz

View original source ↗Read source document ↗Export metadata ↓

Abstract

We study some cosmological constraints on the two phenomenological models of oscillating dark energy. In these scenarios, the equation of state of dark energy varies periodically and may provide a way to unify the early acceleration (inflation) and the late time acceleration of the universe. These models give also an effective way to tackle the so-called cosmic coincidence problem. We examine observational constraints on this class of models from the latest observational data including the \emph{gold} sample of 182 type Ia supernovae, the CMB shift parameter $R$ and the BAO measurements from the Sloan Digital Sky Survey.

Explore related subjects

astro-ph

Keep this discovery

BibTeX RIS

Deepak Jain, Abha Dev, J. S. Alcaniz. 2007-09-26. Cosmological bounds on oscillating dark energy models. https://doi.org/10.1016/j.physletb.2007.09.023

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2012

What do astrophysics and the world's oldest profession have in common?

In the present paper I want to tell of my impressions about the world of research in astrophysics, which I know from close observation. I see with certain pessimism the actual state of astrophysics, as well as of other sciences with similar problems. There are many charms in the profession, as many charms as in love, but not when they are in the service of mercantile aims.

astro-ph↗

arXiv2012

The Theory of Bodily Tides. The Models and the Physics

Description of tides is based on the form of dependence of the geometric lag on the tidal frequency. Some authors assume the lag angle to be constant, others set it to be linear in the frequency. The actual dependence of the lag on the frequency is complicated and is determined by the planet's rheology. A particular form of this dependence will fix the form of the frequency dependence of the tidal quality factor Q. Since at present we know the frequency-dependence of the quality factor, we can reverse our line of reasoning and obtain the appropriate frequency-dependence of the lag. Employment of a realistic frequency-dependence for Q renders considerable changes in timescales defined by tidal dynamics.

astro-ph↗

arXiv2012

Galaxy Formation With Dark Matter and Dark Energy

Eliptical and bulge galaxies share a tight correlation of velocity distribution to both luminosity and black hole mass. There are similar orbital speeds for all galaxies of a given luminosity including dark matter (DM) at large radii. The halo surface density of DM is constant for almost all types of galaxies and ranges 14 mag. down to dwarf spherical galaxies. There are supermassive black holes or giant, pure disk galaxies at high redshift inexplicable with hierarchical clustering or collapse dynamics. These and a myriad of other galaxy formation problems are explainable by an initial shell which caused the Planck cosmic microwave background radiation. A reduction in the energy-density of primordial galactic black holes is necessary to explain dark energy.

astro-ph↗