University of Cambridge

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

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Showing 1993Show all

86 papers · 1 filter

hep-th1993★ 34 cited

Braided Matrix Structure of $q$ -Minkowski Space and $q$ -Poincare Group

Shahn Majid, Ulrich Meyer

We clarify the relation between the approach to $q$ -Minkowski space of Carow-Watamura et al. with an approach based on the idea of $2 \times 2$ braided Hermitean matrices. The latte…

hep-ph1993★ 38 cited

Spontaneous Current Generation in Cosmic Strings

Patrick PETER

It is shown that in models including the standard electroweak theory and for some particular values of the underlying parameters, electric currents can be spontaneously generated i…

hep-th1993★ 29 cited

On Integrable Models Related to the $os p (1, 2)$ Gaudin Algebra

T. Brzezinski, A. J. Macfarlane

We define the $os p (1, 2)$ Gaudin algebra and consider integrable models described by it. The models include the $os p (1, 2)$ Gaudin magnet and the Dicke model related to it. Detailed…

astro-ph1993★ 57 cited

A Possible Local Counterpart to the Excess Population of Faint Blue Galaxies

Stacy McGaugh

OBSERVATIONS of galaxies to very faint magnitudes have revealed a population of blue galaxies at intermediate redshift $^{1 - 5}$ . These galaxies represent a significant excess over t…

hep-th1993★ 32 cited

Cinderella Strings

A. Achucarro, R. Gregory, J. A. Harvey +1

We investigate recent claims concerning a new class of cosmic string solutions in the Weinberg-Salam model. They have the general form of previously discussed semi-local and electr…

hep-th1993★ 11 cited

The Kazhdan-Lusztig conjecture for finite W-algebras

K. de Vos, P. van Driel

We study the representation theory of finite W-algebras. After introducing parabolic subalgebras to describe the structure of W-algebras, we define the Verma modules and give a con…

hep-th1993★ 12 cited

Flux-Confinement in Dilatonic Cosmic Strings

G. W. Gibbons, C. G. Wells

We study dilaton-electrodynamics in flat spacetime and exhibit a set of global cosmic string like solutions in which the magnetic flux is confined. These solutions continue to exis…

astro-ph1993★ 247 cited

Spectral Properties of Blast Wave Models of Gamma-Ray Burst Sources

P. Meszaros, M. J. Rees, H. Papathanassiou

We calculate the spectrum of blast wave models of gamma-ray burst sources, for various assumptions about the magnetic field density and the relativistic particle acceleration effic…

hep-th1993★ 403 cited

Uncertainty Relation in Quantum Mechanics with Quantum Group Symmetry

A. Kempf

We study the commutation relations, uncertainty relations and spectra of position and momentum operators within the framework of quantum group % symmetric Heisenberg algebras and t…

hep-th1993★ 42 cited

Yang-Mills Cosmologies and Collapsing Gravitational Sphalerons

G. W. Gibbons, Alan R. Steif

Cosmological solutions with a homogeneous Yang-Mills field which oscillates and passes between topologically distinct vacua are discussed. These solutions are used to model the col…

astro-ph1993★ 148 cited

Global String Radiation

R. A. Battye, E. P. S. Shellard

We study Goldstone boson (or axion) radiation from global $U (1)$ -strings making direct quantitative comparisons between numerical scalar field theory simulations and linearized ana…

hep-lat1993★ 16 cited

Radial Excited States for Heavy Quark Systems in NRQCD

S. M. Catterall, F. R. Devlin, I. T. Drummond +1

Following the Non-Relativistic QCD approach we use a gauge invariant smearing method with factorization to measure the excitation energies for a heavy $Q Q ˉ$ system on a $24^3\…

hep-th1993★ 5 cited

Tachyon Hair for Two-Dimensional Black Holes

Alan Kostelecky, Malcolm Perry

Using a combination of analytical and numerical methods, we obtain a two-dimensional spacetime describing a black hole with tachyon hair. The physical ADM mass of the black hole is…

hep-ph1993★ 39 cited

Global Strings and the Aharonov-Bohm Effect

A. C. Davis, A. P. Martin

When a fermion interacts with a global vortex or cosmic string a solenoidal "gauge" field is induced. This results in a non-trivial scattering cross-section. For scalars and non-re…

hep-ph1993★ 8 cited

Charged Particle Scattering from Electroweak and Semi-Local Strings

A. C. Davis, A. P. Martin, N. Ganoulis

The scattering of a charged fermion from an electroweak or semi-local string is investigated and a full solution obtained for both massive and massless cases. For the former, with…

cs.LO1993

Set Theory for Verification: I. From Foundations to Functions

Lawrence C. Paulson

A logic for specification and verification is derived from the axioms of Zermelo-Fraenkel set theory. The proofs are performed using the proof assistant Isabelle. Isabelle is gener…

hep-th1993★ 5 cited

Spin Structures on Kleinian Manifolds

Lloyd Alty, Andrew Chamblin

We derive the topological obstruction to spin-Klein cobordism. This result has implications for signature change in general relativity, and for the $N = 2$ superstring.

hep-th1993★ 155 cited

Supersymmetric Self-Gravitating Solitons

G. W. Gibbons, D. Kastor, L. A. J. London +2

We show that the `instantonic' soliton of five-dimensional Yang-Mills theory and the closely related BPS monopole of four-dimensional Yang-Mills/Higgs theory continue to be exact s…

hep-ph1993★ 15 cited

The Spin Structure of the Nucleon

S. D. Bass, A. W. Thomas

We provide an introduction to the ideas of spin-dependent deep-inelastic scattering. Recent experimental results are summarised and possible explanations related to the axial anoma…

hep-th1993★ 10 cited

Hamiltonian Reduction and Topological Conformal Algebra in $c \leq 1$ Non-critical Strings

Katsushi Ito, Hiroaki Kanno

We study the hamiltonian reduction of affine Lie superalgebra $s l (2∣1)^{(1)}$ . Based on a scalar Lax operator formalism, we derive the free field realization of the classical topol…

gr-qc1993★ 77 cited

Solving the Hamilton-Jacobi Equation for General Relativity

J. Parry D. S. Salopek, J. M. Stewart

We demonstrate a systematic method for solving the Hamilton-Jacobi equation for general relativity with the inclusion of matter fields. The generating functional is expanded in a s…

gr-qc1993★ 68 cited

Semi-Classical Limits of Simplicial Quantum Gravity

J. W. Barrett, T. J. Foxon

We consider the simplicial state-sum model of Ponzano and Regge as a path integral for quantum gravity in three dimensions. We examine the Lorentzian geometry of a single 3-simplex…