This white paper summarizes recent progress in the cosmological bootstrap, an approach to
the study of the statistics of primordial fluctuations from consistency with unitarity, locality and …

Cosmic inflation provides a window to the highest energy densities accessible in nature, far
beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the …

We extend the cosmological bootstrap to correlators involving massless particles with spin.
In de Sitter space, these correlators are constrained both by symmetries and by locality. In …

The inflationary origin of primordial black holes (PBHs) relies on a large enhancement of the
power spectrum Δ ζ of the curvature fluctuation ζ at wavelengths much shorter than those of …

For primordial perturbations, deviations from Gaussian statistics on the tail of the probability
distribution can be associated with non-perturbative effects of inflation. In this paper, we …

A bstract Much of the structure of cosmological correlators is controlled by their singularities,
which in turn are fixed in terms of flat-space scattering amplitudes. An important challenge is …

We report a novel prediction from single-field inflation that even a tiny step in the inflaton
potential can change our perception of primordial non-Gaussianities of the curvature …

Our current understanding of the Universe is established through the pristine measurements
of structure in the cosmic microwave background (CMB) and the distribution and shapes of …

A bstract It is becoming increasingly clear that large but rare fluctuations of the primordial
curvature field, controlled by the tail of its probability distribution, could have dramatic effects …

Inflationary perturbations are approximately Gaussian and deviations from Gaussianity are
usually calculated using in-in perturbation theory. This method, however, fails for unlikely …