Our understanding of the state of the universe between the end of inflation and big bang
nucleosynthesis (BBN) is incomplete. The dynamics at the end of inflation are rich and a …

Recently multi-field inflation models that can produce large scalar fluctuations on small
scales have drawn a lot of attention, primarily because they could lead to primordial black …

Primordial black holes (PBHs) provide an exciting prospect for accounting for dark matter. In
this paper, we consider inflationary models that incorporate realistic features from high …

The time evolution of primordial fluctuations conceals a wealth of insights into the high-
energy physics at play during the earliest moments of our Universe, which is ultimately …

We study the formation of primordial black holes and the generation of gravitational waves in
a class of cosmological models that are direct supersymmetric analogs of the …

Realistic models of high-energy physics include multiple scalar fields. Renormalization
requires that the fields have nonminimal couplings to the spacetime Ricci curvature scalar …

This is the first of a three-part series of papers, in which we study the preheating phase for
multifield models of inflation involving nonminimal couplings. In this paper, we study the …

A bstract Recent studies of inflation with multiple scalar fields have highlighted the
importance of non-canonical kinetic terms in novel types of inflationary solutions. This …

Stochastic inflation is an effective theory describing the super-Hubble, coarse-grained,
scalar fields driving inflation, by a set of Langevin equations. We previously highlighted the …

A scale-invariant universe can have a period of accelerated expansion at early times:
inflation. We use a frame-invariant approach to calculate inflationary observables in a scale …