Abstract The Laser Interferometer Space Antenna (LISA) has two scientific objectives of
cosmological focus: to probe the expansion rate of the universe, and to understand …

The production of a stochastic background of gravitational waves is a fundamental
prediction of any cosmological inflationary model. The features of such a signal encode …

Inspired by the chromo-natural inflation model of Adshead&Wyman, we reshape its scalar
content to relax the tension with current observational bounds. Besides an inflaton, the setup …

Attention has focussed recently on models of inflation that involve a second or more fields
with a mass near the inflationary Hubble parameter H, as may occur in supersymmetric …

In this work we analyse in detail the possibility of using small and intermediate-scale
gravitational wave anisotropies to constrain the inflationary particle content. First, we …

A bstract One class of single-field inflationary models compatible with the recently-
conjectured Swampland criteria would be those in which a Hubble slow-roll arameter ϵ H is …

The recently proposed trans-Planckian censorship conjecture (TCC) seems to require that
the energy scale of inflation is significantly lower than the Planck scale (H inf< 10-20 M Pl) …

Characterizing the physical properties of the stochastic gravitational wave background
(SGWB) is a key step towards identifying the nature of its possible origin. We focus our …

Evidence for the presence of extra fields during inflation may be found in the anisotropies of
the scalar and tensor spectra across a vast range of scales. Indeed, beyond the single-field …

Inflation models make specific predictions for a tensor-scalar-scalar three-point correlation,
or bispectrum, between one gravitational-wave (tensor) mode and two density-perturbation …