Recently observational data indicates that the discrepancy arises at late time, when the age of the universe is some billions years. In this context the Friedmann-RobertsonWalker model is a unique correspondence between the expansion rate and the distance scale. Although general theory of relativity (GTR) is the most suitable theory for describing universe as a whole, but still there are some p...

Several modification of Einstein’s general relativity have been proposed and extensively studied so far by many cosmologists to unify gravitation and many other effects in the universe. Barber 1 has produced two continuous self-creation theories by modifying the Brans-Dicke theory and general relativity. The modified theories create the universe out of self-contained gravitational and matter fi...

A recent investigation shows that a local gauge string with a phenomenological energy momentum tensor, as prescribed by Vilenkin, is inconsistent in Brans-Dicke theory. In this work it has been shown that such a string is consistent in a more general scalar tensor theory where ω is function of the scalar field.A set of solutions of full nonlinear Einstein's equations for interior region of such...

We consider an extended scalar-tensor theory of gravity where the action has two interacting scalar fields, a Brans-Dicke field which makes effective Newtonian constant function coordinates and Higgs derivative non-derivative interaction with lagrangian. There is non-trivial between fields dictates dominance different in era. investigate if this setup can describe late-time cosmic acceleration ...

We report the first experimental generation and characterization of a six-photon Dicke state. The produced state shows a fidelity of F=0.56+/-0.02 with respect to an ideal Dicke state and violates a witness detecting genuine six-qubit entanglement by 4 standard deviations. We confirm characteristic Dicke properties of our resource and demonstrate its versatility by projecting out four- and five...