Anisotropic massive strings in scalar-tensor theory of gravitation

TL;DR

This paper models an anisotropic universe with string fluid in scalar-tensor gravity, showing massive strings dominate early universe and vanish later, aligning with observations.

Contribution

It provides an exact solution for an anisotropic scalar-tensor universe with string matter, analyzing the evolution and dominance of massive strings over cosmic time.

Findings

Massive strings dominate in the early universe.

Strings disappear at later stages, consistent with observations.

The model's classical potential is examined.

Abstract

We present the model of anisotropic universe with string fluid as source of matter within the framework of scalar-tensor theory of gravitation. Exact solution of field equations are obtained by applying Berman's law of variation of Hubble's parameter which yields a constant value of DP. The nature of classical potential is examined for the model under consideration. It has been also found that the massive strings dominate in early universe and at long last disappear from universe. This is in agreement with current astronomical observations. The physical and dynamical properties of model are also discussed.