The cosmological constant (CC) term in Einstein's equations, Λ, was first associated to the
idea of vacuum energy density. Notwithstanding, it is well-known that there is a huge, in fact …

A substantial body of phenomenological and theoretical work over the last few years
strengthens the possibility that the vacuum energy density (VED) of the universe is …

Next year we will celebrate 100 years of the cosmological term, Λ, in Einstein's gravitational
field equations, also 50 years since the cosmological constant problem was first formulated …

I review the problem of dark energy focussing on cosmological constant as the candidate
and discuss what it tells us regarding the nature of gravity. Section 1 briefly overviews the …

The nongravitational interaction between the dark components of the Universe could lead to
the variation of dark matter energy density standard evolution law. When we assume this …

We investigate the properties of the FLRW flat cosmological models in which the vacuum
energy density evolves with time, Λ (t). Using different versions of the Λ (t) model, namely …

Despite the many efforts, our theoretical understanding of the ultimate nature of the dark
energy component of the universe still lags well behind the astounding experimental …

We provide a simple mathematical description of the exchange of energy between two fluids
in an expanding Friedmann universe with zero spatial curvature. The evolution can be …

We propose a novel cosmological scenario with the space–time emerging from a pure initial
de Sitter stage and subsequently evolving into the radiation, matter and dark energy …

In the present mainstream cosmology, matter and space-time emerged from a singularity
and evolved through four distinct periods: early inflation, radiation, dark matter, and late-time …