Cosmological gravitational particle production (CGPP) is the creation of particles in an
expanding universe due solely to their gravitational interaction. These particles can play an …

A bstract The phenomenon of cosmological gravitational particle production (CGPP) is
expected to occur during the period of inflation and the transition into a hot big bang …

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 …

A bstract We conjecture that in a consistent supergravity theory with non-vanishing gravitino
mass, the limit m 3/2→ 0 is at infinite distance. In particular one can write M tower~\({m} …

We compute the density of a spin-3 2 particle, the raritron, produced at the end of inflation
due to gravitational interactions. We consider a background inflaton condensate as the …

Oscillons are spatially localized, time-periodic, and long-lived configurations that were
primarily proposed in scalar field theories with attractive self-interactions. In this paper, we …

A bstract The Kalb-Ramond field is an antisymmetric, rank-two tensor field which most
notably appears in the context of string theory, but has largely been unexplored in the …

We demonstrate that gravitational particle production of a massive, Abelian, vector (Proca)
field during inflation in the presence of nonminimal coupling to gravity may suffer from an …

We outline the unique opportunities and challenges in the search for" ultraheavy" dark
matter candidates with masses between roughly 10 TeV and the Planck scale $ m_ {\rm …

A bstract Early Dark Energy (EDE) is a prominent model to resolve the Hubble tension,
which employs a dynamical axion with a periodic potential. In this work, we take first steps …