Quantum Backgrounds

Fe b 20 03 Advances in String Theory in Curved Backgrounds : A Synthesis Report

A synthetic report of the advances in the study of classical and quantum string dynamics in curved backgrounds is provided, namely : the new feature of Multistring solutions ; the mass spectrum of Strings in Curved backgrounds ;

Quantum Field Theory on Curved Backgrounds

Advances on String Theory in Curved Space Times

String Quantum Gravity is motivated and introduced. Advances in the study of the classical and quantum string dynamics in curved spacetime are reported : In 1987, we started a programme [1] to study the string dynamics in curved spacetime and its associated physical phenomena. This study revealed new insights and new physical phenomena with respect to string propagation in flat spacetime (and w...

Sensitivity of a VIRGO Pair to Relic GW Backgrounds

The sensitivity of a pair of VIRGO interferometers to gravitational waves backgrounds (GW) of cosmological origin is analyzed for the cases of maximal and minimal overlap of the two detectors. The improvements in the detectability prospects of scale-invariant and non-scaleinvariant logarithmic energy spectra of relic GW are discussed. Class. Quantum Grav. 17 (2000) 2621-2633

Loop Quantum Gravity and Asymptotically Flat Spaces

After motivating why the study of asymptotically flat spaces is important in loop quantum gravity, we review the extension of the standard framework of this theory to the asymptotically flat sector detailed in [1]. In particular, we provide a general procedure for constructing new Hilbert spaces for loop quantum gravity on non-compact spatial manifolds. States in these Hilbert spaces can be int...

Supertube Dynamics in Diverse Backgrounds

We study the homogeneous and time dependent dynamics of the supertube in diverse backgrounds. After deriving a general form of the Hamiltonian in general background, we use a particular gauge fixing, relevant to our analysis to derive a simpler Hamiltonian. We then study the homogeneous solutions of the equations of motion in various backgrounds and study the effective potential in detail.