Abstract We study the variation of gravitational constant on cosmological scales in scalar-tensor theories gravity. focus simplest models with a coupling to Ricci scalar form F ( ? ) = N 2 pl + ?? , such as extended Jordan-Brans-Dicke 0), or non-minimally coupled field M which permits vary self-consistently time and space. In addition, we allow effective differ from Newton's measured G i.e. eff...

a specific form of the inertial law is presented by which we can gain a deeper insight into the essence of mass and inertia. in this modified theory, there is no need to keep the concept of absolute space and newton's third law as principles, by introducing a convenient form for gravitational law the coupling constant g becomes a function of inertial parameters of the universe

A specific form of the inertial law is presented by which we can gain a deeper insight into the essence of mass and inertia. In this modified theory, there is no need to keep the concept of absolute space and Newton's third law as principles, By introducing a convenient form for gravitational law the coupling constant G becomes a function of inertial parameters of the universe

We study gravitational baryogenesis in an isotropic and homogeneous universe the framework of general relativity. investigate a new exact solution Einstein’s field equations for FRW metric. Our represents transitioning model which was expanding decelerated mode passes on to accelerated after dominance cosmological constant $$\Lambda$$ . observe that occurs derived universe, baryon-entropy ratio...