In this review, a pedagogical introduction to the concepts of slow-roll inflationary universe
and number of e-folds is provided. In particular, the differences between the basic notion of …

Cosmic inflation provides an attractive framework for understanding the early Universe and
the cosmic microwave background. It can readily involve energies close to the scale at …

A bstract If reheating of the Universe takes place via Planck-suppressed decay, it seems that
the thermalization of produced particles might be delayed, since they have large …

We estimate dark matter (DM) density for the Universe with a reheating temperature smaller
than the mass of DM, assuming DM to be a weakly interacting massive particle. During the …

We revisit the recently proposed multi-natural inflation and its realization in supergravity in
light of the BICEP2 results. Multi-natural inflation is a single-field inflation model where the …

Recent attempts to fully resolve the Hubble tension from early dark energy models seem to
favor a primordial Harrison-Zeldovich universe with its scalar spectrum being extremely …

We place observational constraints on slow-variation single-field inflationary models by
carrying out the cosmological Monte Carlo simulation with the recent data of Planck …

We examine the class of initial conditions that give rise to inflation. Our analysis is carried
out for several popular models including Higgs inflation, Starobinsky inflation, chaotic …

We prove that a homogeneous and isotropic universe containing a scalar field with a power-
law potential, V (ϕ)= A ϕ n, with 0< n< 1 and A> 0 always develops a finite-time singularity at …

A bstract We show that the recently proposed multi-natural inflation can be realized within
the framework of 4D\(\mathcal {N}\)= 1 supergravity. The inflaton potential mainly consists of …