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Non-standard gravitational waves imply gravitational slip: on the difficulty of partially hiding new gravitational degrees of freedom
Ignacy Sawicki, Ippocratis D. Saltas, Mariele Motta +2
In many generalized models of gravity, perfect fluids in cosmology give rise to gravitational slip. Simultaneously, in very broad classes of such models, the propagation of gravita…
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…
Improving Fisher matrix forecasts for galaxy surveys: window function, bin cross-correlation, and bin redshift uncertainty
Alberto Bailoni, Alessio Spurio Mancini, Luca Amendola
The Fisher matrix is a widely used tool to forecast the performance of future experiments and approximate the likelihood of large data sets. Most of the forecasts for cosmological…
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…
Cosmology and Fundamental Physics with the Euclid Satellite
Luca Amendola, Stephen Appleby, Anastasios Avgoustidis +69
Euclid is a European Space Agency medium class mission selected for launch in 2020 within the Cosmic Vision 2015 2025 program. The main goal of Euclid is to understand the origin o…
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…