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 …

We present an overview of scenarios where the observed Dark Matter (DM) abundance
consists of Feebly Interacting Massive Particles (FIMPs), produced nonthermally by the so …

We review scenarios in which the particles that account for the Dark Matter (DM) in the
Universe interact only through their couplings with the Higgs sector of the theory, the so …

Ultralight boson fields, with a mass around 10-23 eV, are promising candidates for the
elusive cosmological dark matter. These fields induce a periodic oscillation of the spacetime …

The recently claimed anomaly in the measurement of the 21 cm hydrogen absorption signal
by EDGES at z∼ 17, if cosmological, requires the existence of new physics. The possible …

A notable feature of UV freeze-in is that the relic density is strongly dependent on the highest
temperatures of the thermal bath, and a common assumption is that the relevant" highest …

We investigate the particle production from thermal gravitational annihilation in the very
early universe, which is an important contribution for particles that might not be in thermal …

We provide further details on a recent proposal addressing the nature of the dark sectors in
cosmology and demonstrate that all current observations related to Dark Matter can be …

A bstract We investigate the nightmare scenario of dark sectors that are made of non-abelian
gauge theories with fermions, gravitationally coupled to the Standard Model (SM). While …

Bimetric gravity is a theory of gravity that posits the existence of two interacting and
dynamical metric tensors. The spectrum of bimetric gravity consists of a massless and a …