Abstract

In the present paper we have discussed the Mathematical Properties of non static and non empty cosmological models
with variable Cosmological constant (?) & variable Gravitational constant (G) under some suitable assumptions. It may
be concluded that the Cosmological constant (?) may be replaced by a non-linear scalar field. It has been also focused
that there is close relation between model with scalar field & model with perfect fluids whose equation of state is more or
less exotic.

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