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

The existence of a fundamental scale, a lower bound to any output of a position
measurement, seems to be a model-independent feature of quantum gravity. In fact, different …

Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …

Strings may be explored, through a scattering process at planckian energies, down to
distances of the order of the string size. We show that this is possible if the energy is not so …

A pedagogical and self-contained introduction to noncommutative quantum field theory is
presented, with emphasis on those properties that are intimately tied to string theory and …

I show that it is possible to formulate the Relativity postulates in a way that does not lead to
inconsistencies in the case of spacetimes whose short-distance structure is governed by an …

We study the operator that corresponds to the measurement of volume, in non-perturbative
quantum gravity, and we compute its spectrum. The operator is constructed in the loop …

We discuss a Gedanken experiment for the measurement of the area of the apparent
horizon of a black hole in quantum gravity. Using rather general and model-independent …

We present a compact formula for the complete tree-level S-matrix of pure Yang-Mills and
gravity theories in arbitrary spacetime dimensions. The new formula for the scattering of n …

A bstract In a recent note we presented a compact formula for the complete tree-level S-
matrix of pure Yang-Mills and gravity theories in arbitrary spacetime dimension. In this paper …