Universe is assumed to be filled with viscous fluid at its early stages. To explain accelerated expansion of the Universe apart from time varying G and lambda time varying coefficient of viscosity of the fluid which fills the Universe can be considered, However the nature of variation is not known. Is it possible to get an answer of this?
This may help us to solve mystery of dark matter and dark energy.
From various published literature on viscous Cosmological models with time varying G and lambda it is argued that soon after the Big-Bang when neutrinos decouples from matter the Universe is supposed to be filled with viscous fluid . It is also suggested with the evolution of the Universe that coefficient of bulk viscosity varies with some power of matter density . Time varying 'G' and lambda along with varying bulk coefficient can be considered for setting up Dark Energy models and can explain accelerated expansion of the Universe.
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