Utpal Mukhopadhyay

The dark energy equation of state

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

Variable Equation of State for Generalized Dark Energy Model

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

Λ-CDM UNIVERSE: A PHENOMENOLOGICAL APPROACH WITH MANY POSSIBILITIES

by selecting a phenomenological

DARK ENERGY WITH POLYTROPIC EQUATION-OF-STATE

\Lambda

Phenomenology of Λ-CDM Model: A Possibility of Accelerating Universe with Positive Pressure

model of the form,

Higher Dimensional Dark Energy Investigation with Variable Λ and G

\dot\Lambda\sim H^3

DARK ENERGY MODELS WITH VARIABLE EQUATION OF STATE PARAMETER

. 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,

Scenario of Inflationary Cosmology from the Phenomenological Λ Models

\omega(t)

GENERALIZED MODEL FOR Λ DARK ENERGY

, 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.

Time Variable Λ and the Accelerating Universe

We present a model for the present accelerating Universe and focus on the different important physical variables involved in the model under the phenomenological assumption Λ∝H2 with a prescription for equation of state parameter in the form