We determine the number counts to second order in cosmological perturbation theory in the
Poisson gauge and allowing for anisotropic stress. The calculation is performed using an …

We discuss the dominant terms of the relativistic galaxy number counts to second order in
cosmological perturbation theory on sub-Hubble scales and on intermediate to large …

Accounting for all the relativistic effects, we have developed the fully nonlinear gauge-
invariant formalism for describing the cosmological observables and presented the second …

A long-standing question in cosmology is whether gravitational lensing changes the
distance–redshift relation D (z) or the mean flux density of sources. Interest in this has been …

We investigate the weak lensing corrections to the cosmic microwave background
temperature anisotropies considering effects beyond the Born approximation. To this aim …

We show that at second order, ensemble averages of observables and directional averages
do not commute due to gravitational lensing—observing the same thing in many directions …

We present a new method to compute the deflection of light rays in a perturbed FLRW
geometry. We exploit the properties of the Geodesic Light Cone (GLC) gauge where null …

Forthcoming surveys will extend the understanding of cosmological large scale structures up
to unprecedented redshift. According to this perspective, we present a fully relativistic …

We study up to second order the galaxy number over-density that depends on magnification
in redshift space on cosmological scales for a concordance model. The result contains all …

It has recently been shown that second-order corrections to the background distance-
redshift relation can build up significantly at large redshifts, due to an aggregation of …