We develop a novel approach to constrain the Hubble parameter H0 and the primordial power spectrum amplitude As using supernovae type Ia (SNIa) data. By considering SNIa as tracers of the peculiar velocity field, we can model their distance and their covariance as a function of cosmological parameters without the need of calibrators like Cepheids; this yields a new independent probe of the...
The two-point correlation function is a widely used summary statistic for extracting information from cosmological fields. Even when these fields are perfectly Gaussian, the likelihood of two-point function estimators is inherently non-Gaussian, particularly on the large angular scales that will be probed by upcoming stage-IV weak lensing surveys. Despite this, weak lensing analyses have so...
We assume that at a late stage of inflation, a scalar inflaton field, a thermal plasma, and a spacetime metric coexisted and interacted with each other. We expand them to the linear order around a homogeneous background and combine the perturbations into a set of gauge invariant variables. For the latter we derive evolution equations in the framework of smooth reheating. Having resolved some...
The weak equivalence principle is a fundamental pillar in our understanding of gravity, stating that any test particle falls in a gravitational potential in the same way, regardless of its composition. The validity of this principle for dark matter remains a key open question, which is however rarely addressed in cosmological analyses and often studied under the assumption of specific models....
Gravitational redshift is one of Einstein’s first predictions. On cosmological scales, we observe that the light emitted by Bright Central Galaxies at the bottom of a cluster’s gravitational potential is more redshifted than the average member galaxy. A first detection of this signal was made in 2011, but later studies questioned its interpretation, highlighting additional kinematic...
I will briefly review the main concepts of the EFT of Large-Scale Structure, a theoretical framework that provides a systematic analytic description of cosmological observables on large scales. I will present a general perturbative model for a tracer of matter that depends on the line-of-sight selection effects, and argue that it applies to the Lyman alpha forest. Then, I will formulate the...
Quadratic estimators techniques are widely used in the context of CMB, with applications to CMB lensing, patchy reionization and cosmic birefringence. They have also been applied to some extent in the context of large-scale structure, with emphasis on the primordial non-Gaussianity. We will show for the first time how quadratic estimator techniques can be used to test General Relativity on...
