Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

A number of challenges to the standard Λ CDM model have been emerging during the past
few years as the accuracy of cosmological observations improves. In this review we discuss …

The simplest ΛCDM model provides a good fit to a large span of cosmological data but
harbors large areas of phenomenology and ignorance. With the improvement of the number …

It is well known that quantum field theory (QFT) induces a huge value of the cosmological
constant (CC), Λ, which is outrageously inconsistent with cosmological observations. We …

The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued
with theoretical conundrums related not only with the renormalization procedure itself, but …

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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 …

We demonstrate that massive fields, such as dark matter, can directly produce a
cosmological evolution of the fundamental constants of nature. We show that a scalar or …

We investigate f (T) cosmology in both the background, as well as in the perturbation level,
and we present the general formalism for reconstructing the equivalent one-parameter …

Abstract The\(\Lambda\)-term in Einstein's equations is a fundamental building block of the
'concordance'\(\Lambda\) CDM model of cosmology. Even though the model is not free of …