40 citations · 234 across the 11 of their papers we have counts for
11 papers
Observational Constraints in Nonlocal Gravity: the Deser-Woodard Case
Luca Amendola, Yves Dirian, Henrik Nersisyan +1
We study the cosmology of a specific class of nonlocal model of modified gravity, the so-called Deser-Woodard (DW) model, modifying the Einstein-Hilbert action by a term $\sim R f(…
Gravitational wave speed: Implications for models without a mass scale
Henrik Nersisyan, Nelson A. Lima, Luca Amendola
The recent report that the gravitational wave speed equals the light speed puts strong constraints on the anisotropic stress parameter of many modified gravity models, a quantity t…
Quantum Gravity inspired nonlocal gravity model
Luca Amendola, Nicolo Burzilla, Henrik Nersisyan
We consider a nonlocal gravity model motivated by nonperturbative Quantum Gravity studies. This model, if correct, suggests the existence of strong IR relevant effects which can le…
Structure formation in the Deser-Woodard nonlocal gravity model: a reappraisal
Henrik Nersisyan, Adrian Fernandez Cid, Luca Amendola
In this work, we extend previous analyses of the structure formation in the model of nonlocal gravity proposed by Deser and Woodard (DW), which reproduces the backg…
Instabilities in tensorial nonlocal gravity
Henrik Nersisyan, Yashar Akrami, Luca Amendola +3
We discuss the cosmological implications of nonlocal modifications of general relativity containing tensorial structures. Assuming the presence of standard radiation- and matter-do…
Dynamical analysis of cosmology: Impact of initial conditions and constraints from supernovae
Henrik Nersisyan, Yashar Akrami, Luca Amendola +2
We discuss the cosmological implications of the nonlocal modification to standard gravity. We relax the assumption of special initial conditions in the local formula…
A spectre is haunting the cosmos: Quantum stability of massive gravity with ghosts
Frank Könnig, Henrik Nersisyan, Yashar Akrami +2
Many theories of modified gravity with higher order derivatives are usually ignored because of serious problems that appear due to an additional ghost degree of freedom. Most dange…
Electromagnetic Casimir effect for conducting plates in de Sitter spacetime
A. S. Kotanjyan, A. A. Saharian, H. A. Nersisyan
Two-point functions, the mean field squared and the vacuum expectation value (VEV) of the energy-momentum tensor are investigated for the electromagnetic field in the geometry of p…
Consistent metric combinations in cosmology of massive bigravity
Henrik Nersisyan, Yashar Akrami, Luca Amendola
Massive bigravity models are interesting alternatives to standard cosmology. In most cases, however, these models have been studied for a simplified scenario in which both metrics…
Electromagnetic two-point functions and Casimir densities for a conducting plate in de Sitter spacetime
A. A. Saharian, A. S. Kotanjyan, H. A. Nersisyan
We evaluate the two-point function for the electromagnetic field tensor in -dimensional de Sitter spacetime assuming that the field is prepared in Bunch-Davies vacuum state.…
Scalar and fermionic vacuum currents in de Sitter spacetime with compact dimensions
S. Bellucci, A. A. Saharian, H. A. Nersisyan
Vacuum expectation values (VEVs) of the current densities for charged scalar and Dirac spinor fields are investigated in (D+1)-dimensional de Sitter (dS) spacetime with toroidally…