All cosmological observations to date are consistent with adiabatic, Gaussian and nearly
scale invariant initial conditions. These findings provide strong evidence for a particular …

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 identify a characteristic pattern in the scalar-induced stochastic gravitational wave
background from particle production during inflation. If particle production is sufficiently …

The past two decades have seen transformative advances in cosmology and string theory.
Observations of the cosmic microwave background have revealed strong evidence for …

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 …

We study a model of inflation in which a scalar field χ is non-minimally coupled to
Starobinsky's R 2 gravity. After transforming it to the Einstein frame, a new scalar field, the …

A bstract We apply the effective field theory approach to quasi-single field inflation, which
contains an additional scalar field with Hubble scale mass other than inflaton. Based on the …

We compute the low energy effective field theory (EFT) expansion for singlefield inflationary
models that descend from a parent theory containing multiple other scalar fields. By …

The analyticity of response functions and scattering amplitudes implies powerful relations
between low-energy observables and the underlying short-distance dynamics. These …

A bstract Developing our understanding of how correlations evolve during inflation is crucial
if we are to extract information about the early Universe from our late-time observables. To …