ep - t h / 96 07 08 5 v 1 1 1 Ju l 1 99 6 IFUP - TH 29 / 96 Boundary Exchange Algebras and Scattering on the Half Line

ar X iv : h ep - t h / 96 07 12 2 v 1 1 5 Ju l 1 99 6 Classical and quantum N = 1 super W ∞ - algebras

We construct higher-spin N=1 super algebras as extensions of the super Virasoro algebra containing generators for all spins s ≥ 3/2. We find two distinct classical (Poisson) algebras on the phase super space. Our results indicate that only one of them can be consistently quantized.

X iv : h ep - p h / 96 05 29 7 v 1 1 4 M ay 1 99 6 DO - TH 96 / 08 May 1996 Probing the Parton Densities of Virtual Photons at ep

The feasibility of an experimental determination of the parton distributions of virtual photons at high energy ep colliders is studied in the context of the DESY-HERA collider. Recently proposed parton densities of virtual photons are utilized to evaluate the appropriate production processes and their relevant kinematical regions. It is demonstrated that high E T jet production with E T ≃ 5−7 G...

ar X iv : h ep - t h / 96 07 19 7 v 1 2 5 Ju l 1 99 6 DSF preprint 96 / 36 NON - LOCAL BOUNDARY CONDITIONS FOR MASSLESS SPIN - 12 FIELDS

This paper studies the 1-loop approximation for a massless spin-1/2 field on a flat four-dimensional Euclidean background bounded by two concentric 3-spheres, when non-local boundary conditions of the spectral type are imposed. The use of ζ-function regularization shows that the conformal anomaly vanishes, as in the case when the same field is subject to local boundary conditions involving proj...

ar X iv : h ep - t h / 96 07 09 3 v 1 1 2 Ju l 1 99 6 Quantum dynamics of N = 1 , D = 4 supergravity compensator

ar X iv : h ep - t h / 96 04 15 9 v 1 2 5 A pr 1 99 6 BGU - PH - 96 / 08 SPECTRUM OF COSMIC GRAVITATIONAL WAVE BACKGROUND

Models of string cosmology predict a stochastic background of gravitational waves with a spectrum that is strongly tilted towards high frequencies. I give simple approximate expressions for spectral densities of the cosmic background which can be directly compared with sensitivities of gravitational wave detectors.