Abstract The standard Λ Cold Dark Matter (ΛCDM) cosmological model provides a good
description of a wide range of astrophysical and cosmological data. However, there are a …

The statistical description of a system containing a large number of particles which interact
via Newtonian gravity is discussed. Such a system exhibits several peculiarities due to the …

All cosmological observations to date are consistent with adiabatic, Gaussian and nearly
scale invariant initial conditions. These findings provide strong evidence for a particular …

For a Gaussian spectrum of primordial density fluctuations, ultracompact minihalos (UCMHs)
of dark matter are expected to be produced in much greater abundance than, eg, primordial …

We investigate inflationary scenarios driven by a class of potentials which are similar in form
to those that arise in certain minimal supersymmetric extensions of the standard model. We …

Heavy fields coupled to the inflaton reduce the speed of sound in the effective theory of the
adiabatic mode each time the background inflationary trajectory deviates from a geodesic …

The angular power spectrum of the cosmic microwave background temperature anisotropy
observed by WMAP has an anomalous dip at ℓ∼ 20 and a bump at ℓ∼ 40. One explanation …

We explore a class of primordial power spectra that can fit the observed anisotropies in the
cosmic microwave background well and that predicts a value for the Hubble parameter …

Abstract Using modified Richardson-Lucy algorithm we reconstruct the primordial power
spectrum (PPS) from Planck Cosmic Microwave Background (CMB) temperature anisotropy …

Certain oscillatory features in the primordial scalar power spectrum are known to provide a
better fit to the outliers in the cosmic microwave background data near the multipole …