A Class of Stationary Rotating String Cosmological Models

TL;DR

This paper introduces a new class of stationary rotating string cosmological models, generalizing the Gödel universe, with adjustable parameters to satisfy energy conditions and featuring a negative cosmological constant.

Contribution

It presents a one-parameter family of models extending the Gödel universe, highlighting the role of the cosmological constant in rotation and energy conditions.

Findings

Models include the Gödel universe as a special case.

Rotation depends on a negative cosmological constant.

Energy conditions can be satisfied through parameter choices.

Abstract

We obtain a one parameter class of stationary rotating string cosmological models of which the well-known G$\ddot o $del Universe is a particular case. By suitably choosing the free parameter function, it is always possible to satisfy the energy conditions. The rotation of the model hinges on the cosmological constant which turns out to be negative.