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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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46 papers · 1 filter
Galilei covariance and (4,1) de Sitter space
A. E. Santana, F. C. Khanna, Y. Takahashi
A vector space G is introduced such that the Galilei transformations are considered linear mappings in this manifold. The covariant structure of the Galilei Group (Y. Takahashi, Fo…
A Measurement of the tau->electron Branching Ratio
The OPAL Collaboration, G. Abbiendi et al
The branching ratio for the decay tau->e nue nutau has been measured using Z0 decay data collected by the OPAL experiment at LEP. In total 33073 tau->e nue nutau candidates were id…
Metric Fluctuation Corrections to Hawking Radiation
C. Barrabès, V. Frolov, R. Parentani
We study how fluctuations of the black hole geometry affect the properties of Hawking radiation. Even though we treat the fluctuations classically, we believe that the results so o…
Gravitational Scattering of Cosmic Strings by Non-Rotating Black Holes
Jean-Pierre De Villiers, Valeri Frolov
This paper discusses the gravitational scattering of a straight, infinitely long test cosmic string by a black hole. We present numerical results that probe the two-dimensional par…
The SO(32) Heterotic and Type IIB Membranes
F. Aldabe, A. L. Larsen
A two dimensional anomaly cancellation argument is used to construct the SO(32) heterotic and type IIB membranes. By imposing different boundary conditions at the two boundaries of…
Chiral Lagrangians and the transition amplitude for radiative muon capture
J. Smejkal, E. Truhlik, F. C. Khanna
The transition operator for the radiative capture of mesons mu minus by protons is constructed starting from a chiral Lagrangian of the N-pi-rho-a_1-omega system obtained within th…
Domain wall interacting with a black hole: A new example of critical phenomena
V. P. Frolov, A. L. Larsen, M. Christensen
We study a simple system that comprises all main features of critical gravitational collapse, originally discovered by Choptuik and discussed in many subsequent publications. These…
Observation of a Coherence Length Effect in Exclusive Rho^0 Electroproduction
K. Ackerstaff
Exclusive incoherent electroproduction of the rho^0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q**2>0.…
Critical Collapse Beyond Spherical Symmetry: General Perturbations of the Roberts Solution
Andrei V. Frolov
This paper studies the non-spherical perturbations of the continuously self-similar critical solution of the gravitational collapse of a massless scalar field (the Roberts solution…
Nut Charge, Anti-de Sitter Space and Entropy
S. W. Hawking, C. J. Hunter, D. N. Page
It has been proposed that spacetimes with a U(1) isometry group have contributions to the entropy from Misner strings as well as from the area of dimensional fixed point sets…
Diffractive point sets with entropy
M. Baake, R. V. Moody
After a brief historical survey, the paper introduces the notion of entropic model sets (cut and project sets), and, more generally, the notion of diffractive point sets with entro…
Determination of the Deep Inelastic Contribution to the Generalised Gerasimov-Drell-Hearn Integral for the Proton and Neutron
K. Ackerstaff
The virtual photon absorption cross section differences [sigma_1/2-sigma_3/2] for the proton and neutron have been determined from measurements of polarised cross section asymmetri…
The massless gravitino and the AdS/CFT correspondence
Steven Corley
We solve the Dirichlet boundary value problem for the massless gravitino on space and compute the two-point function of the dual CFT supersymmetry currents using the $A…
Production of Chi_c2 Mesons in Photon-Photon Collisions at LEP
The OPAL Collaboration, K. Ackerstaff et al
We present an observation at LEP of the production of chi_c2 mesons in the collisions of two quasi-real photons using the OPAL detector. The chi_c2 mesons are reconstructed in the…
Search for Higgs Bosons and New Particles Decaying into Two Photons at sqrt(s) = 183 GeV
The OPAL Collaboration, K. Ackerstaff et al
A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a data sample of 57.7 pb-1 collected at an ave…
Multi-photon production in e+e- collisions at sqrt(s) = 183 GeV
The OPAL Collaboration, K. Ackerstaff et al
The process e+e- to gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 56.2 pb-1 take…
Planckian space is an exact solution of the semiclassical Einstein equations
Sergey N. Solodukhin
The product space configuration (with and being radiuses of the components) carrying the electric charge is demonstrated to be an exact solution of th…
Measurement of the Proton Spin Structure Function g1p with a Pure Hydrogen Target
A. Airapetian
A measurement of the proton spin structure function g1p(x,Q^2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron be…
Finite temperature nonlocal effective action for quantum fields in curved space
Yu. V. Gusev, A. I Zelnikov
Massless and massive scalar fields and massless spinor fields are considered at arbitrary temperatures in four dimensional ultrastatic curved spacetime. Scalar models under conside…
The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering
K. Ackerstaff
The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02<x<0.3 and 1 GeV^2<Q^2<10 GeV^2, for the first time from semi-inclusive deep-ine…
Black Hole Entropy in Induced Gravity: Reduction to 2D Quantum Field Theory on the Horizon
V. Frolov, D. Fursaev
It is argued that degrees of freedom responsible for the Bekenstein-Hawking entropy of a black hole in induced gravity are described by two dimensional quantum field theory defined…
The HERMES Spectrometer
K. Ackerstaff
The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and He. These data give in…
Density dependence of meson - nucleon vertices in nuclear matter
A. M. Rakhimov, F. C. Khanna, U. T. Yakhshiev +1
Changes in the meson-nucleon coupling constant and the vertex form factor in nuclear matter are studied in a modified Skyrme Lagrangian including the sigma-meson field that satisfi…
Black hole lasers
S. Corley, T. Jacobson
High frequency dispersion does not alter the low frequency spectrum of Hawking radiation from a single black hole horizon, whether the dispersion entails subluminal or superluminal…