Recent work is reviewed in which compactifications of string and M theory are constructed in
which all scalar fields (moduli) are massive, and supersymmetry is broken with a small …

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

Cosmic inflation provides a window to the highest energy densities accessible in nature, far
beyond those achievable in any realistic terrestrial experiment. Theoretical insights into the …

We give a brief overview of the string landscape and techniques used to construct string
compactifications. We then explain how this motivates the notion of the swampland and …

The past two decades have seen transformative advances in cosmology and string theory.
Observations of the cosmic microwave background have revealed strong evidence for …

We present a simple mechanism for obtaining large-field inflation, and hence a gravitational
wave signature, from string theory compactified on twisted tori. For nil manifolds, we obtain a …

We analyze the spectrum of density perturbations generated in models of the recently
discovered “D-cceleration” mechanism of inflation. In this scenario, strong coupling quantum …

Recently, it has been found that complete resolution of the Hubble tension might point to a
scale-invariant Harrison-Zeldovich spectrum of primordial scalar perturbation, ie, ns= 1 for H …

A bstract We analyze a general class of locally supersymmetric, CP and modular invariant
models of lepton masses depending on two complex moduli taking values in the vicinity of a …

In models of natural inflation, the inflaton is an axionlike particle. Unfortunately, axion
potentials in UV-complete theories appear to be too steep to drive inflation. We show that …