61 citations · 299 across the 14 of their papers we have counts for
4 papers · 1 filter
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…
Complete density perturbations in the Jordan-Fierz-Brans-Dicke theory
J. A. R. Cembranos, A. de la Cruz Dombriz, L. Olano Garcia
In the context of scalar-tensor theories we study the evolution of the density contrast for Jordan-Fierz-Brans-Dicke theories in a Friedmann-Lemaitre-Robertson-Walker Universe. Cal…
Modified spinning black holes
J. A. R. Cembranos, A. de la Cruz-Dombriz, P. Jimeno Romero
In the context of f(R) modified gravity theories we determine that the black holes existence is determined by the sign of a parameter dependent of the mass, the charge, the spin an…
Kerr-Newman black holes in f(R) theories
J. A. R. Cembranos, A. de la Cruz-Dombriz, P. Jimeno Romero
In the context of f(R) modified gravity theories, we study the Kerr-Newman black-hole solutions. We study non-zero constant scalar curvature solutions and discuss the metric tensor…