We present a brief, and to a great extent, pedagogical, review on renormalization in curved
spacetime and some recent results on the derivation and better understanding of quantum …

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 …

In this paper, we use the type Ia supernovae data to constrain the holographic dark energy
model proposed by Li. We also apply a cosmic age test to this analysis. We consider in this …

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 …

We study a generic class of time-evolving vacuum models which can provide a better
phenomenological account of the overall cosmological observations as compared to the Λ …

Despite the many outstanding cosmological observations leading to a strong evidence for a
non-vanishing cosmological constant (CC) term Λ in the gravitational field equations, the …

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 …

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 …