Anisotropic strange compact stars in Krori–Barua spacetime under f(R,G) gravity.

There are a number of different theories which tend to explain the concept of universe's accelerated expansion. Among these theories, modified gravity is the most promising one. This paper elaborates matter distribution along with different characteristics of anisotropic compact stars in f (R , G) gravity background. Specifically, to profoundly understand physical behavior of the compact stars, we considered six compact stars, namely: Her X-1 ( CS 1 ), SAXJ1808.4-3658 ( CS 2 ), 4U1820-30 ( CS 3 ), PSR J 1614 2230 ( CS 4 ), VELA X-1 ( CS 5 ) and Cen X-3 ( CS 6 ) and calculated the corresponding quantities such as energy density (ρ), radial pressure ( p r ) and tangential pressure ( p t ) using three distinct models of f (R , G) gravity. For simplicity, f (R , G) gravity is divided into two parts as: f (R , G) = f 1 (R) + f 2 (G). The first part f 1 (R) is considered Hu–Sawicki like model, while the second part f 2 (G) is considered logarithmic like for Model 1 and power law like for Model 2 and Model 3. Predominantly, measurements of anisotropy, the energy conditions (ECs) and stability aspects of models for considered compacts stars are presented using graphical techniques. Furthermore, we also established that for the f (G) model parameter (n > 0), all the six stars show conventional behavior. [ABSTRACT FROM AUTHOR]