We review in detail a number of approaches that have been adopted to try and explain the
remarkable observation of our accelerating universe. In particular we discuss the arguments …

This is a review of the physics and cosmology of the cosmological constant. Focusing on
recent developments, I present a pedagogical overview of cosmology in the presence of a …

The cosmological constant ADS Classic is now deprecated. It will be completely retired in
October 2019. This page will automatically redirect to the new ADS interface at that point …

Recently, a novel class of models for inflation has been found in which the inflationary
dynamics is driven solely by (noncanonical) kinetic terms rather than by potential terms. As …

A nearly massless, slowly rolling scalar field φ may provide most of the energy density of the
current Universe. One potential difficulty with this idea is that couplings to ordinary matter …

We explore the cosmological implications of an ultralight pseudo Nambu-Goldstone boson.
With global spontaneous symmetry breaking scale f≃ 10 18 GeV and explicit breaking scale …

We discuss the particle physics basis for models of natural inflation with pseudo Nambu-
Goldstone bosons and study the consequences for large-scale structure of the nonscale …

The study of cosmic phase transitions are of central interest in modern cosmology. In the
standard model of cosmology the Universe begins in a very hot state, right after at the end of …

We consider the ultralight pseudo Nambu-Goldstone boson appearing in the late-time
cosmological phase tansition theories as a major dark matter candidate. Since it is almost …

Dynamical vacuum energy or quintessence, a slowly varying and spatially inhomogeneous
component of the energy density with negative pressure, is currently consistent with …