Dynamical systems theory is especially well-suited for determining the possible asymptotic
states (at both early and late times) of cosmological models, particularly when the governing …

Field equations in a scalar-tensor theory of gravitation proposed by Saezand Ballester
(1985) are obtained with the aid of (i) Friedmann-type metric (ii) a non static plane symmetric …

Abstract Five dimensional Kaluza-Klein space-time is considered in the presence of cosmic
string source in the frame work of scalar-tensor theory of gravitation proposed by Saez and …

Axially symmetric space time is considered in the presence of cosmic string source and thick
domain walls in the frame work of Lyra (1951) geometry. Exact cosmological models, which …

By adopting the co-moving coordinate system, an exact axially symmetric cosmological
model with string dust cloud source is obtained in the framework of Brans-Dicke [Phys. Rev …

We study the qualitative properties of cosmological models in scalar-tensor theories of
gravity by exploiting the formal equivalence of these theories with general relativity …

We investigates the effect of accretion of cosmic fluid on the evolution of Primordial Black
Holes (PBHs) within the framework of Modified gravity theories. We consider a general form …

Abstract Five dimensional Kaluza-Klein space-time is considered in the presence of thick
domain walls in the framework of scalar-tensor theory of gravitation proposed by Saez and …

A cosmology is considered driven by a stress-energy tensor consisting of a perfect fluid, an
inhomogeneous pressure term (which we call a “tachyonic dust” for reasons which will …

In this paper we study the dynamics of the universe in Friedmann–Robertson–Walker
models including perfect fluid and coupled scalar field with nonzero scalar potential in …