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 …

This review article provides a pedagogical introduction into various classes of chiral string
compactifications to four dimensions with D-branes and fluxes. The main concern is to …

Flavor symmetry plays a crucial role in the standard model of particle physics but its origin is
still unknown. We develop a new method (based on outer automorphisms of the Narain …

One of the fundamental new symmetries of nature that has been the subject of intense
discussion in particle physics of the past decade is the symmetry between bosons and …

Calabi-Yau spaces are complex spaces with a vanishing first Chern class, or, equivalently,
with a trivial canonical bundle (sheaf), so they admit a Ricci-flat Kähler metric that satisfies …

This biennial Review summarizes much of particle physics. Using data from previous
editions, plus 2158 new measurements from 551 papers, we list, evaluate, and average …

We propose a bottom-up approach to particle physics model building from string theory. We
start this program by using configurations of type-IIB D3-and D7-branes located at …

We present a systematic study of the constraints coming from target-space duality and the
associated duality-anomaly cancellations on orbifold-like 4D strings. A prominent role is …

String theory leads to a flavor scheme where modular symmetries play a crucial role.
Together with the traditional flavor symmetries they combine to an eclectic flavor group …

This is a pedagogical review article surveying the various approaches towards
understanding gauge coupling unification within string theory. As is well known, one of the …