Search Publications

Linear and non-linear Modified Gravity forecasts with future surveys

Kunz, Martin; Pettorino, Valeria; Martinelli, Matteo +1 more

Modified Gravity theories generally affect the Poisson equation and the gravitational slip in an observable way, that can be parameterized by two generic functions (η and µ) of time and space. We bin their time dependence in redshift and present forecasts on each bin for future surveys like Euclid. We consider both Galaxy Clustering and Weak…

Primordial power spectrum features in phenomenological descriptions of inflation

Mena, Olga; Boubekeur, Lotfi; Gariazzo, Stefano +1 more

We extend an alternative, phenomenological approach to inflation by means of an equation of state and a sound speed, both of them functions of the number of e-folds and four phenomenological parameters. This approach captures a number of possible inflationary models, including those with non-canonical kinetic terms or scale-dependent non-gaussiani…

Cosmological models with running cosmological term and decaying dark matter

Szydłowski, Marek; Stachowski, Aleksander

We investigate the dynamics of the generalized ΛCDM model, which the Λ term is running with the cosmological time. On the example of the model Λ(t) =Λ_bare + α²/t² we show the existence of a mechanism of the modification of the scaling law for energy density of dark matter: ρ_dm ∝^{a - 3 + λ(t)}. W…