80 citations · 492 across the 15 of their papers we have counts for
15 papers
Behaviour of Charged Collapsing Fluids after Hydrostatic Equilibrium in R^n Gravity
Hafiza Rizwana Kausar
The purpose of this paper is to study the transport equation and its coupling with Maxwell equation in the framework of R^n gravity. Using Muller-Israel-Stewart theory for the cond…
Gravitational Wave Polarization Modes in Theories
H. Rizwana Kausar, Lionel Philippoz, Philippe Jetzer
Many studies have been carried out in the literature to evaluate the number of polarization modes of gravitational waves in modified theories, in particular in theories. In…
Dynamical Analysis of Charged Anisotropic Spherical Star in f(R) Gravity
H. Rizwana Kausar, Ifra Noureen, M. Umair Shahzad
We consider a modified gravity theory, , in the metric formulation and analyze the contribution of electromagnetic field on the range of dynamical inst…
Hot Plasma Modes Across Reissner-Nordstrom de Sitter Horizon in a Veselago Medium
Ifra Noureen, Hafiza Rizwana Kausar
In this manuscript, wave attributes of hot plasma around Reissner- Nordstrom-de Sitter (RN-dS) metric in a Veselago medium are in- vestigated. General relativistic magnetohydrodyn…
Dissipative Spherical Collapse of Charged Anisotropic Fluid in f(R) Gravity
H. Rizwana Kausar, Ifra Noureen
This manuscript is devoted to study the combined effect of a viable model, f(R) = R + αR^n, and electromagnetic field on the instability range of gravitational collapse. We assume…
Effects of CDTT Model on the Dynamical Instability of Cylindrically Symmetric Collapsing Stars
Hafiza Rizwana Kausar
We assume cylindrically symmetric stars which begin collapsing by dissipating energy in the form of heat flux. We wish to study the effects of Carroll-Duvvuri-Trodden-Turner (CDTT)…
Newtonian and Post Newtonian Expansionfree Fluid Evolution in f(R) Gravity
M. Sharif, H. Rizwana Kausar
We consider a collapsing sphere and discuss its evolution under the vanishing expansion scalar in the framework of gravity. The fluid is assumed to be locally anisotropic wh…
Effects of f(R) Model on the Dynamical Instability of Expansionfree Gravitational Collapse
M. Sharif, H. Rizwana Kausar
Dark energy models based on f(R) theory have been extensively studied in literature to realize the late time acceleration. In this paper, we have chosen a viable f(R) model and dis…
Expansionfree Fluid Evolution and Skripkin Model in f(R) Theory
M. Sharif, H. Rizwana Kausar
We consider the modified theory of gravity whose higher order curvature terms are interpreted as a gravitational fluid or dark source. The gravitational collapse of a spheri…
Dust Static Spherically Symmetric Solution in Gravity
Muhammad Sharif, Hafiza Rizwana Kausar
In this paper, we take dust matter and investigate static spherically symmetric solution of the field equations in metric f(R) gravity. The solution is found with constant Ricci sc…
Anisotropic Fluid and Bianchi Type III Model in f(R) Gravity
M. Sharif, H. Rizwana Kausar
This paper is devoted to study the Bianchi type III model in the presence of anisotropic fluid in f(R) gravity. Exponential and power-law volumetric expansions are used to obtain e…
Non-vacuum Solutions of Bianchi Type VI_0 Universe in f(R) Gravity
M. Sharif, H. Rizwana Kausar
In this paper, we solve the field equations in metric f(R) gravity for Bianchi type VI_0 spacetime and discuss evolution of the expanding universe. We find two types of non-vacuum…
Effects of f(R) Dark Energy on Dissipative Anisotropic Collapsing Fluid
M. Sharif, H. Rizwana Kausar
The purpose of this paper is to study the effects of dark energy on dynamics of the collapsing fluid within the framework of metric f(R) gravity. The fluid distribution is assumed…
Gravitational Perfect Fluid Collapse in f(R) Gravity
M. Sharif, H. Rizwana Kausar
In this paper, we investigate spherically symmetric perfect fluid gravitational collapse in metric gravity. We take non-static spherically symmetric metric in the interior r…
Behavior of Time-varying Constants in Relativity
M. Sharif, H. Rizwana Kausar
In this paper, we consider Bianchi type III and Kantowski-Sachs spacetimes and discuss the behavior of time-varying constants and by using two symmetric techniques, namely,…