/pdf/inferring-the-dark-matter-power-spectrum-from-the-lyman-bw7vudgb7t.pdf

Inferring the dark matter power spectrum from the Lyman-Alpha forest in high-resulotion QSO absorption spectra

The cosmic expansion history tests the dynamics of the global evolution of the universe and its energy density contents, while the cosmic growth history tests the evolution of the inhomogeneous part of the energy density Precision comparison of the two histories can distinguish the nature of the physics responsible for the accelerating cosmic expansion: an additional smooth component - dark energy - or a modification of the gravitational field equations With the aid of a new fitting formula for linear perturbation growth accurate to 005-02percent, we separate out the growth dependence on the expansion history and introduce a new growth index parameter \gamma that quantifies the gravitational modification

Cosmic Growth History and Expansion History

Holographic Dark Energy from Fluid/Gravity Duality Constraint by Cosmological Observations

The WMAP satellite has completed 1 year of measurements of the cosmic microwave background (CMB) radiation using 20 differential high electron mobility transistor (HEMT) based radiometers. All the radiometers are functioning nominally, and characterizations of the on-orbit radiometer performance are presented, with an emphasis on properties that are required for the production of sky maps from the timeordered data. A radiometer gain model, used to smooth and interpolate the CMB dipole gain measurements, is also presented. No degradation in the sensitivity of any of the radiometers has been observed during the first year of observations. Subject headings: cosmic microwave background — cosmology: observations — instrumentation: detectors — radio continuum: general — space vehicles: instruments

First-year wilkinson microwave anisotropy probe (wmap) 1 observations:

https://iopscience.iop.org/article/10.1088/1361-6382/aaa6a3/pdf

Emergent universe with wormholes in massive gravity

We study cosmological models with modified Chaplygin gas (MCG) to determine observational constraints on its EoS parameters using the background and the growth tests data. The background test data consists of $H(z)-z$
 data, Baryonic Acoustic Oscillations peak parameter, CMB shift parameter, SN Ia data and the growth test data consists of the linear growth function for the large scale structures of the universe are considered to study MCG in favor of dark energy. For a given range of redshift, the Wiggle-Z measurements and rms mass fluctuations from Ly-
 $\alpha $
 data, employed for analyzing cosmological models numerically to constrain the MCG parameters. The Wang-Steinhardt ansatz for the growth index (
 $\gamma $
 ) and growth function (
 $f$
 ) are also considered for numerical analysis. The best-fit values of EoS parameters determined here are used to study the variation of $f$
 , growth index (
 $\gamma $
 ), EoS parameter, squared sound speed and deceleration parameter with redshift. The constraints on the MCG parameters found here are compared with that of GCG (generalized Chaplygin gas) model for viable cosmology. Cosmologies with MCG satisfactorily describe late acceleration followed by a matter dominated phase. The range of values of EoS parameters, the associated parameters (
 $f$
 , $\gamma $
 , $\omega $
 , $\varOmega $
 , $c^{2}_{s}$
 , $q$
 ) are also determined from observational data in order to understand the suitability of the MCG model.

Aroon Beesham

Papers

Constraints on modified Chaplygin gas from large scale structure