Abstract Models where dark matter and dark energy interact with each other have been
proposed to solve the coincidence problem. We review the motivations underlying the need …

The problem of dark energy is briefly reviewed in both theoretical and observational aspects.
In the theoretical aspect, dark energy scenarios are classified into symmetry, anthropic …

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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 …

Modified gravity theories with geometry-matter coupling, in which the action is an arbitrary
function of the Ricci scalar and the matter Lagrangian [f (R, L m) gravity], and of the Ricci …

We show that the number of observed voids in galaxy redshift surveys is a sensitive function
of the equation of state of dark energy. Using the Fisher matrix formalism, we find the error …

Recent studies of quantum field theory in FLRW spacetime suggest that the cause of the
speeding up of the universe is the running vacuum (RV), see Moreno-Pulido and Solà …

The recent observations from the James Webb Space Telescope have led to a surprising
discovery of a significant density of massive galaxies with masses of M≥ 10 10.5 M⊙ at …

We investigate the main features of the flat Friedmann-Lemaître-Robertson-Walker
cosmological<? format?> models in the f (T) modified gravity regime. In particular, a general …

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 …