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 …

We present a detailed investigation of a subdominant oscillating scalar field [“early dark
energy”(EDE)] in the context of resolving the Hubble tension. Consistent with earlier work …

Axions are some of the best motivated particles beyond the Standard Model. We show how
the attractive self-interactions of dark matter (DM) axions over a broad range of masses, from …

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 …

We analyze in detail the perturbative decay of the inflaton oscillating about a generic form of
its potential V (ϕ)= ϕ k, taking into account the effects of non-instantaneous reheating. We …

We perform a systematic analysis of dark matter production during postinflationary
reheating. Following the period of exponential expansion, the inflaton begins a period of …

Local measurements of the Hubble parameter are increasingly in tension with the value
inferred from a Λ CDM fit to the cosmic microwave background (CMB) data. In this paper, we …

It has been a half-decade since the first direct detection of gravitational waves, which
signifies the coming of the era of the gravitational-wave astronomy and gravitational-wave …

We investigate the power spectrum of Non-Cold Dark Matter (NCDM) produced in a state out
of thermal equilibrium. We consider dark matter production from the decay of scalar …