56 citations · 116 across the 3 of their papers we have counts for
3 papers
Vacuum energy as dark matter
F. D. Albareti, J. A. R. Cembranos, A. L. Maroto
We consider the vacuum energy of massive quantum fields in an expanding universe. We define a conserved renormalized energy-momentum tensor by means of a comoving cutoff regulariza…
The Raychaudhuri equation in homogeneous cosmologies
F. D. Albareti, J. A. R. Cembranos, A. de la Cruz-Dombriz +1
In this work we address the issue of studying the conditions required to guarantee the Focusing Theorem for both null and timelike geodesic congruences by using the Raychaudhuri eq…
On the non-attractive character of gravity in f(R) theories
F. D. Albareti, J. A. R. Cembranos, A. de la Cruz-Dombriz +1
In General Relativity without a cosmological constant a non-positive contribution from the space-time geometry to Raychaudhuri equation is found provided that particular energy con…