Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

Inflationary models predicting a scale-dependent large amplification of the density
perturbations have recently attracted a lot of attention because the amplified perturbations …

Axion-like particles (ALPs) decaying into photons are known to affect a wide range of
astrophysical and cosmological observables. In this study we focus on ALPs with masses in …

Abstract Should Primordial Black Holes (PBHs) exist in nature, they would inevitably accrete
baryonic matter in their vicinity. In turn, the consequent emission of high-energy radiation …

Thecosmic calibration tension'is a $> 5\sigma $ discrepancy between the cosmological
distance ladder built from baryonic acoustic oscillations (BAO) calibrated by the …

The cosmological recombination radiation (CRR) is one of the guaranteed ΛCDM spectral
distortion (SD) signals. Even if very small in amplitude, it provides a direct probe of the three …

Forthcoming missions probing the absolute intensity of the CMB are expected to be able to
measure spectral distortions, which are deviations from its blackbody distribution. As cosmic …

With the advent of new missions to probe spectral distortions of the cosmic microwave
background with unprecedented precision, the study of theoretical predictions of these …

Measurements of the cosmic microwave background (CMB) spectral distortions (SDs) will
open a new window on the very early universe, providing new information complementary to …

A plethora of inflationary models can produce interesting small-scale phenomenology, such
as enhanced scalar fluctuations leading to primordial black hole (PBH) production and large …