Cosmology, high-energy physics and astrophysics are today converging to the study of large
scale magnetic fields. While the experimental evidence for the existence of large scale …

The duality-type symmetries of string cosmology naturally lead us to expect a pre-big-bang
phase of accelerated evolution as the dual counterpart of the decelerating expansion era of …

The field equations, which emerge from string theory, are solved to leading order in α′ for
the case of black hole space-times. We show how the results fit into a broader outlook on …

A bstract We study classical closed bosonic strings probing the near-horizon region of a non-
extremal black hole and show that this corresponds to understanding string theory in the …

We show the complete integrability of the string propagation in D-dimensional de Sitter
spacetime. We find that the string equations of motion, which correspond to a noncompact O …

In the last fifteen years, various areas of high energy physics, astrophysics and theoretical
physics have converged on the study of cosmology so that any graduate student in these …

We provide a group theory approach to coherent states describing quantum space-time and
its properties. This provides a relativistic framework for the metric of a Riemmanian space …

We provide a quantum unifying picture for black holes of all masses and their main
properties covering classical, semiclassical, Planckian, and trans-Planckian gravity …

The string propagation equations in axisymmetric spacetimes are exactly solved by
quadratures for a planetoid ansatz. This is a straight nonoscillating string, radially disposed …

We compute the exact equation of state of circular strings in the (2+ 1)–dimensional de Sitter
(dS) and anti–de Sitter (AdS) spacetimes, and analyze its properties for the different …