Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of BonnDE1.5k papers
- University of OxfordGB1.5k papers
- Lawrence Berkeley National LaboratoryUS1.5k papers
- Michigan State UniversityUS1.5k papers
- Stony Brook UniversityUS1.5k papers
- University of WuppertalDE1.5k papers
- The Ohio State UniversityUS1.5k papers
- Centre National de la Recherche ScientifiqueFR1.5k papers
- Stockholm UniversitySE1.4k papers
- Johannes Gutenberg University MainzDE1.4k papers
- Uppsala UniversitySE1.4k papers
- University of ManchesterGB1.4k papers
48 papers · 1 filter
All conformally flat pure radiation metrics
S. Brian Edgar, Garry Ludwig
The complete class of conformally flat, pure radiation metrics is given, generalising the metric recently given by Wils.
Thermal Field Dynamics and Bialgebras
T. Kopf, A. E. Santana, F. C. Khanna
In Thermal Field Dynamics, thermal states are obtained from restrictions of vacuum states on a doubled field algebra. It is shown that the suitably doubled Fock representations of…
Rigidly Rotating Strings in Stationary Spacetimes
V. Frolov, S. Hendy, J. P. De Villiers
In this paper we study the motion of a rigidly rotating Nambu-Goto test string in a stationary axisymmetric background spacetime. As special examples we consider the rigid rotation…
Direct CP Violation Asymmetries in Exclusive B Decays in a Bethe-Salpeter Approach
A. N. Kamal, C. W. Luo
CP asymmetry in some exclusive decays of charged B meson are calculated in a Bethe-Salpeter approach. Hadronic final state interactions are ignored. Complex decay amplitudes are as…
Inverting Time-Dependent Harmonic Oscillator Potential by a Unitary Transformation and a New Class of Exactly Solvable Oscillators
Ali Mostafazadeh
A time-dependent unitary (canonical) transformation is found which maps the Hamiltonian for a harmonic oscillator with time-dependent real mass and real frequency to that of a gene…
Quantum Canonical Transformations and Exact Solution of the Schreodinger Equation
Ali Mostafazadeh
Time-dependent unitary transformations are used to study the Schreodinger equation for explicitly time-dependent Hamiltonians of the form , where is…
A test of the instanton vacuum chiral quark model with axial anomaly low-energy theorems
M. M. Musakhanov, F. C. Khanna
The QCD + QED axial anomaly low-energy theorems are applied to estimate the accuracy of an instanton vacuum - based chiral quark model. The low-energy theorems give an exact relati…
Null Strings in Schwarzschild Spacetime
Mariusz P. Dabrowski, Arne. L. Larsen
The null string equations of motion and constraints in the Schwarzschild spacetime are given. The solutions are those of the null geodesics of General Relativity appended by a null…
Are Higher Order Membranes stable in Black Hole Spacetimes?
A. L. Larsen, C. O. Lousto
We continue the study of the existence and stability of static spherical membrane configurations in curved spacetimes. We first consider higher order membranes described by a Lagra…
Heat-kernel Coefficients and Spectra of the Vector Laplacians on Spherical Domains with Conical Singularities
Lara De Nardo, Dmitri V. Fursaev, Gennaro Miele
The spherical domains with conical singularities are a convenient arena for studying the properties of tensor Laplacians on arbitrary manifolds with such a kind of singular…
Cosmic Strings and Black Holes
A. L. Larsen
In the first part of this talk, I consider some exact string solutions in curved spacetimes. In curved spacetimes with a Killing vector (timelike or spacelike), the string equation…
Cosmological Einstein-Yang-Mills equations
B. K. Darian, H. P. Kunzle
We use a systematic construction method for invariant connections on homogeneous spaces to find the Einstein-SU(n)-Yang-Mills equations for Friedmann-Robertson-Walker and locally r…
Two-Component Formulation of the Wheeler-DeWitt Equation
Ali Mostafazadeh
The Wheeler-DeWitt equation for the minimally coupled FRW-massive-scalar-field minisuperspace is written as a two-component Schrödinger equation with an explicitly `time'-dependent…
Spectral Geometry and Causality
Tomas Kopf
For a physical interpretation of a theory of quantum gravity, it is necessary to recover classical spacetime, at least approximately. However, quantum gravity may eventually provid…
The Spin-Dependent Structure Functions of Nucleons and Nuclei
F. C. Khanna, A. Yu. Umnikov
We discuss connection between spin-dependent SFs of nucleons and nuclei in the deep inelastic lepton scattering. The case of the deuteron is studied in detail in the Bethe-Salpeter…
Chiral-Odd Structure Function h_1^D(x) and Tensor Charge of the Deuteron
A. Yu. Umnikov, Han-xin He, F. C. Khanna
The chiral-odd structure function h_{1}^D(x) and the tensor charge of the deuteron are studied within the Bethe-Salpeter formalism for the deuteron amplitude. Utilizing a simple mo…
Medium Modification of Nucleon Properties in Skyrme Model
F. Khanna, A. M. Rakhimov, M. M. Musakhanov +1
A Skyrme type Lagrangian for a skyrmion imbedded in a baryon rich environment is proposed. The dependence of static nucleon properties and nucleon - nucleon tensor interaction on n…
Deep inelastic scattering on the deuteron in the Bethe-Salpeter formalism II: Realistic -interaction
A. Yu. Umnikov, F. C. Khanna, L. P. Kaptari
We present a systematic study of the leading twist structure functions of the deuteron, F_2^D, b_{1,2}^D and g_1^D in a fully relativistic approach. Our study is based on a realist…
Non-Abelian Geometrical Phase for General Three-Dimensional Quantum Systems
Ali Mostafazadeh
Adiabatic geometric phases are studied for arbitrary quantum systems with a three-dimensional Hilbert space. Necessary and sufficient conditions for the occurrence of the no…
Numerical investigation of black hole interiors
S. Droz
Gravitational perturbations which are present in any realistic stellar collapse to a black hole, die off in the exterior of the hole, but experience an infinite blueshift in the in…
Axially Symmetric Bianchi I Yang-Mills Cosmology as a Dynamical System
B. K. Darian, H. P. Kunzle
We construct the most general form of axially symmetric SU(2)-Yang-Mills fields in Bianchi cosmologies. The dynamical evolution of axially symmetric YM fields in Bianchi I model is…
Statistical Origin of Black Hole Entropy in Induced Gravity
V. P. Frolov, D. V. Fursaev, A. I. Zelnikov
The statistical-mechanical origin of the Bekenstein-Hawking entropy in the induced gravity is discussed. In the framework of the induced gravity models the Einstein action…
Erratum to: ``Banach spaces without local unconditional structure''
Ryszard A. Komorowski, Nicole Tomczak-Jaegermann
This note contains a corrected proof of the main result (which remains unchanged) from [K-T]. It was recently observed that an argument in a basic technical criterium has a gap.
Adiabatic Product Expansion
Ali Mostafazadeh
The time-evolution operator for an explicitly time-dependent Hamiltonian is expressed as the product of a sequence of unitary operators. These are obtained by successive time-depen…