This is a review of particle-theory models of inflation, and of their predictions for the
primordial density perturbation that is thought to be the origin of structure in the Universe. It …

Current upper bounds on the neutron electric dipole moment constrain the physically
observable quantum chromodynamic (QCD) vacuum angle| θ¯|≲ 10− 11. Since QCD …

I provide a pedagogical introduction to supersymmetry. The level of discussion is aimed at
readers who are familiar with the Standard Model and quantum field theory, but who have …

In the context of string theory, axions appear to provide the most plausible solution of the
strong CP problem. However, as has been known for a long time, in many string-based …

I provide a pedagogical introduction to supersymmetry. The level of discussion is aimed at
readers who are familiar with the Standard Model and quantum field theory, but who have …

This paper is devoted to recent progress made towards the understanding of closed bosonic
and fermionic string perturbation theory, formulated in a Lorentz-covariant way on Euclidean …

We study general properties of the low-energy effective theory for 4D type II superstrings
obtained by the compactification on an abstract (2, 2) superconformal system. This is the …

We present what we believe are the first specific string (D-brane) constructions whose low-
energy limit yields just a three generation SU (3)× SU (2)× U (1) standard model with no …

We present a refined version of our three—generation flipped SU (5) XU (l) string model with
the following properties.—The complete massless spectrum is derived and shown to be free …

A low-energy analysis of macroscopic superstrings is presented and various analogies
between these superstrings and solitons in supersymmetric theories are discussed. These …