The first direct measurement of gravitational waves by the LIGO and Virgo collaborations
has opened up new avenues to explore our Universe. This white paper outlines the …

It is commonly assumed that the energy density of the Universe was dominated by radiation
between reheating after inflation and the onset of matter domination 54,000 years later …

Compact objects occupy a pivotal role in the exploration of Nature. The interest spans from
the role of compact objects in astrophysics to their detection through various methods …

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 …

In the presence of self-interactions, the post-inflationary evolution of the inflaton field is
driven into the non-linear regime by the resonant growth of its fluctuations. The once …

Homogeneous oscillations of the inflaton after inflation can be unstable to small spatial
perturbations even without coupling to other fields. We show that for inflaton potentials∝| ϕ …

Oscillons are massive, long-lived, localized excitations of a scalar field. We show that in a
class of well-motivated single-field models, inflation is followed by self resonance, leading to …

We consider the effects of fragmentation on the post-inflationary epoch of reheating. In
simple single field models of inflation, an inflaton condensate undergoes an oscillatory …

The classical equations of motion for an axion with potential V (ϕ)= ma 2 fa 2 [1− cos (ϕ/fa)]
possess quasi-stable, localized, oscillating solutions, which we refer to as``axion stars''. We …

We show that fragmentation of the inflaton into long-lived spatially localized oscillon
configurations can lead to copious production of black holes. In simple inflation models …