We constrain the growth index γ by performing a full-shape analysis of the power spectrum
multipoles measured from the BOSS DR12 data. We adopt a theoretical model based on the …

We consider Horndeski modified gravity models obeying stability, velocity of gravitational
waves c T equals c and quasistatic approximation on subhorizon scales. We assume further …

We investigate the characteristic modifications in the evolving cosmological perturbations
when dark energy interacts with dust-like matter, causing the latter's background energy …

Combining supernovae, baryon acoustic oscillations, and redshift-space distortions data
from the next generation of (stage-IV) cosmological surveys, we aim to reconstruct the …

In the present investigation we use observational data of f σ _ 8 f σ 8 to determine
observational constraints in the plane (Ω _ m0, σ _ 8)(Ω m 0, σ 8) using two different …

We study the growth of linear matter density perturbations in a modified gravity approach of
scalar field couplings with metric and torsion. In the equivalent scalar-tensor formulation, the …

We performed a Bayesian study on three beyond ΛCDM phenomenological triggering
parameters, the growth index γ, the dark energy equation of state parameter ω and the …

We analyze the global behavior of the growth index of cosmic inhomogeneities in an
isotropic homogeneous universe filled by cold nonrelativistic matter and dark energy (DE) …

Since the discovery of the accelerated cosmic expansion, one of the most important tasks in
observational cosmology is to determine the nature of the dark energy. We should build our …

We study dynamical dark energy (DE) models within Einstein's theory by means of matter
perturbations and the growth index γ. Within four-dimensional General Relativity, we …