Motivated by conceptual problems in quantum theories of gravity, the gravitational eikonal
approach, inspired by its electromagnetic predecessor, has been successfully applied to the …

We propose a novel measure of chaotic scattering amplitudes. It takes the form of a log-
normal distribution function for the ratios rn= δ n/δ n+ 1 of (consecutive) spacings δ n …

A bstract Higher-derivative corrections to the Einstein-Hilbert action are present in bosonic
string theory leading to the potential causality violations recently pointed out by Camanho et …

We study interactions of string coherent states in the DDF (after Di Vecchia, Del Giudice,
Fubini) formalism. For simplicity we focus on open bosonic strings. After reviewing basic …

A bstract We discuss the soft behaviour of open string amplitudes with gluons and massive
states in any dimension. Notwithstanding non-minimal couplings of massive higher spin …

We extend our analysis of the soft behavior of string amplitudes with massive insertions to
closed strings at tree level (sphere). Relying on our previous results for open strings on the …

Through the AdS/CFT correspondence, Lifshitz spacetimes describe field theories with
dynamical scaling (z≠ 1). Although curvature invariants are small, the Lifshitz metric exhibits …

At first, we derive a boundary state, associated with a moving D p-brane, in the presence of
the Kalb-Ramond field and a U (1) gauge potential. Then, from the interaction of such D p …

A bstract The eikonal operator was originally introduced to describe the effect of tidal
excitations on higher-genus elastic string amplitudes at high energy. In this paper we …

We consider a thought experiment in which an energetic massless string probes
a'stringhole'(a heavy string lying on the correspondence curve between strings and black …