We review the Batalin-Tyutin approach of quantising second class systems which consists in enlarging the phase space to convert such systems into first class. The quantisation of first class systems,â€¦ (More)

The present work shows that a combination of nonlinear contributions from the Ricci curvature in Einstein field equations can drive a late time acceleration of expansion of the universe. The transitâ€¦ (More)

In this paper it is shown that in Brans Dicke theory, if one considers a non-minimal coupling between the matter and the scalar field, it can give rise to a late time accelerated expansion for theâ€¦ (More)

It is shown that a minimally coupled scalar field in Bransâ€“Dicke theory yields a nonâ€“decelerated expansion for the present universe for open, flat and closed Friedmann-Robertson-Walker models.

In the present work, it is shown that a chameleon scalar field having a nonminimal coupling with dark matter can give rise to a smooth transition from a decelerated to an accelerated phase ofâ€¦ (More)

In the present work, an attempt has been made to explain the recent cosmic acceleration of the universe with two mutually interacting scalar fields, one being the Brans Dicke scalar field and theâ€¦ (More)

The present work shows that a combination of nonlinear contributions from the Ricci curvature in Einstein field equations can drive a late time acceleration of expansion of the universe. The transitâ€¦ (More)

In this paper it is shown that the Brans Dicke scalar field itself can serve the purpose of providing an early deceleration and a late time acceleration of the universe without any need ofâ€¦ (More)

In this paper, it is shown completely analytically that a spintessence model in the dust dominated universe can very well serve the purpose of providing an early deceleration and a present dayâ€¦ (More)

We prove that both global monopole and minimally coupled static zero mass scalar field are electrogravity dual of the Schwarzschild solution or flat space and they share the same equation of state, Tâ€¦ (More)