Search Publications

Interacting parametrized post-Friedmann method

Xu, Lixin; Richarte, Martín G.

We apply the interacting parametrized post-Friedmann (IPPF) method to coupled dark energy models where the interaction is proportional to dark matter density at background level. In the first case, the dark components are treated as fluids and the growth of dark matter perturbations only feel the interaction via the modification of background quan…

Emergent cosmology, inflation and dark energy

Herrera, Ramón; Guendelman, Eduardo; Labrana, Pedro +2 more

A new class of gravity-matter models defined in terms of two independent non-Riemannian volume forms (alternative generally covariant integration measure densities) on the space-time manifold are studied in some detail. These models involve an additional (square of the scalar curvature) term as well as scalar matter field potentials of appropriate…

A new inflation potential with NMC to gravity in light of Planck and BICEP2 data

Bennai, M.; Naciri, M.; Mounzi, Z. +2 more

Study of Lorentz violation in INTEGRAL gamma-ray bursts

Steiner, Frank; Produit, Nicolas; Lamon, Raphael

We search for possible time lags caused by quantum gravitational effects using gamma-ray bursts (GRBs) detected by INTEGRAL. The advantage of this satellite is that we have at our disposal the energy and arrival time of every detected single photon, which enhances the precision of the time resolution. We present a new method for seeking time lags …