Spherically symmetric equilibrium configurations of perfect fluid obeying a polytropic
equation of state are studied in spacetimes with a repulsive cosmological constant. The …

There are both the black hole horizon and the cosmological horizon for the charged
topological dilaton de Sitter spacetime. The thermodynamic quantities on both horizons …

Weak field gravitational wave solutions are investigated in Brans–Dicke (BD) theory in the
presence of a cosmological constant. In this setting the background geometry is not flat but …

We study a black hole with a blurred mass density instead of a singular one, which is caused
by the noncommutativity of three-space. Depending on its mass, such object has either …

A scheme for the generalized Chaplygin gas equation of state is shown by using the
holographic Ricci dark energy. Regression analysis and a chi-square test were performed. A …

The Hulse-Taylor binary provides possibly the best test of GR to date. We find the modified
quadrupole formula for infinite derivative gravity (IDG). We investigate the backreaction …

Abstract Ghost-free Infinite Derivative Gravity (IDG) is a modifed gravity theory which can
avoid the singularities predicted by General Relativity. This thesis examines the effect of IDG …

This research provides second-order approximate Noether symmetries of geodetic
Lagrangian of time-conformal plane symmetric spacetime. A time-conformal factor is of the …

Within the closed universe, we obtain the amplitude and frequency of gravitational waves in
the terms of discrete wave numbers, wave propagation time, and cosmological constant …

We discuss black hole solutions of Einstein-Λ gravity in the presence of nonlinear
electrodynamics in dS spacetime. Considering the correlation of the thermodynamic …