Aspects of superstring cosmology are reviewed with an emphasis on the cosmological
implications of duality symmetries in the theory. The string effective actions are summarized …

We present nucleon–antinucleon scattering experiments performed at the Low Energy
Antiproton Ring (LEAR) of CERN. The data are reviewed and the underlying physics is …

The double copy is, in essence, a map between scattering amplitudes in a broad variety of
familiar field and string theories. In addition to the mathematically rich intrinsic structure, it …

A bstract We use holography to study sensitive dependence on initial conditions in strongly
coupled field theories. Specifically, we mildly perturb a thermofield double state by adding a …

A bstract We consider higher derivative corrections to the graviton three-point coupling
within a weakly coupled theory of gravity. Lorentz invariance allows further structures …

We explain how the string spectrum in flat space and pp-waves arises from the large-N limit,
at fixed g 2 YM, of U (N) Script N= 4 super Yang Mills. We reproduce the spectrum by …

We study observables in a conformal field theory which are very closely related to the ones
used to describe hadronic events at colliders. We focus on the correlation functions of the …

We consider field theories with sixteen supersymmetries, which include U (N) Yang-Mills
theories in various dimensions, and argue that their large N limit is related to certain …

A bstract We study propagation of a probe particle through a series of closely situated
gravitational shocks. We argue that in any UV-complete theory of gravity the result does not …

Newton's equations for the motion of N nonrelativistic point particles attracting according to
the inverse square law may be cast in the form of equations for null geodesics in a (3 N+ 2) …