A. A. Usmani

The dark energy equation of state

We perform a study of cosmic evolution with an equation of state parameter

A Relativistic Model for Strange Quark Star

\omega(t)=\omega_0+\omega_1(t\dot H/H)

Charged gravastars admitting conformal motion

by selecting a phenomenological

A comparison of Hořava–Lifshitz gravity and Einstein gravity through thin-shell wormhole construction

\Lambda

Thin-shell wormholes from charged black holes in generalized dilaton-axion gravity

model of the form,

Features of galactic halo in a brane world model and observational constraints

\dot\Lambda\sim H^3

Galactic rotation curves inspired by a noncommutative-geometry background

. This simple proposition explains both linearly expanding and inflationary Universes with a single set of equations. We notice that the inflation leads to a scaling in the equation of state parameter,

The (2+1)-dimensional charged gravastars

\omega(t)

The (2+1)-dimensional gravastars

, and hence in equation of state. In this approach, one of its two parameters have been pin pointed and the other have been delineated. It has been possible to show a connection between dark energy and Higgs-Boson.

Galactic rotation curves and brane‐world models

We propose a relativistic model for strange quark stars within the framework of MIT Bag model. In our model, we assume that the highly compact strange stars are anisotropic in nature which is an expected feature in the ultra high density regime. We discuss various physical features of the model and show that the model satisfies all the regularity conditions. By estimating the value of the Bag constant for strange star candidates like 4U 1820-30, Her X-1 and SAX J 1808.4-3658, we show that a wire range of values of the Bag constant are possible for such stars though, in the case of 4U 1820-30, the estimated value of the Bag constant has been found to be very close to its currently acceptable range. Nevertheless, our results are in agreement with the recent CERN-SPS and RHIC data.