Ten years ago, the discovery that the expansion of the universe is accelerating put in place
the last major building block of the present cosmological model, in which the universe is …

In the current paper, a dark energy (DE) model reconstructed from the well‐motivated
deceleration parameter (DP) q (z)= q 0+ q 1 z/(1+ z) 2 q(z)=q_0+q_1z/(1+z)^2 is analyzed. A …

We perform a joint determination of the distance–redshift relation and cosmic expansion rate
at redshifts z= 0.44, 0.6 and 0.73 by combining measurements of the baryon acoustic peak …

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We present constraints on the dark energy equation-of-state parameter, w= P/(ρc 2), using
60 SNe Ia from the ESSENCE supernova survey. We derive a set of constraints on the …

We present constraints on the mean matter density, Ωm, dark energy density, ΩDE, and the
dark energy equation of state parameter, w, using Chandra measurements of the X-ray gas …

We study the cosmological evolution of a nonflat Friedmann-Robertson-Walker Universe
filled by pressureless dark matter and Barrow holographic dark energy (BHDE). The latter is …

In order to shed some light on the current discussion about f (R)-gravity theories we derive
and discuss the bounds imposed by the energy conditions on a general f (R) functional form …

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 …

Discrepancies between observations at early and late cosmic epochs, and the vacuum
energy problem associated with the interpretation of cosmological constant, are …