The covariant approach to LRS perfect fluid spacetime geometries

Perfect fluid LRS Bianchi I with time varying constants

It is investigated the behaviour of the “constants” G, c and Λ in the framework of a perfect fluid LRS Bianchi I cosmological model. It has been taken into account the effects of a c−variable into the curvature tensor. Two exact cosmological solutions are investigated, arriving to the conclusion that if q < 0 (deceleration parameter) then G, c are growing functions on time t while Λ is a negati...

Spacetime Geometries

Spacetimes admitting quasi-conformal curvature tensor

‎The object of the present paper is to study spacetimes admitting‎ ‎quasi-conformal curvature tensor‎. ‎At first we prove that a quasi-conformally flat spacetime is Einstein‎ ‎and hence it is of constant curvature and the energy momentum tensor of such a spacetime satisfying‎ ‎Einstein's field equation with cosmological constant is covariant constant‎. ‎Next‎, ‎we prove that if the perfect flui...

from linguistics to literature: a linguistic approach to the study of linguistic deviations in the turkish divan of shahriar

chapter i provides an overview of structural linguistics and touches upon the saussurean dichotomies with the final goal of exploring their relevance to the stylistic studies of literature. to provide evidence for the singificance of the study, chapter ii deals with the controversial issue of linguistics and literature, and presents opposing views which, at the same time, have been central to t...

Deviation of geodesics in FLRW spacetime geometries

The geodesic deviation equation (‘GDE’) provides an elegant tool to investigate the timelike, null and spacelike structure of spacetime geometries. Here we employ the GDE to review these structures within the Friedmann–Lemâıtre–Robertson–Walker (‘FLRW’) models, where we assume the sources to be given by a non-interacting mixture of incoherent matter and radiation, and we also take a non-zero co...