Showing 1999Show all

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hep-ph1999★ 15 cited

The Challenge of Small x

R. D. Ball, P. V. Landshoff

We review the current understanding of the behaviour of inclusive cross sections at small x and large Q^2 in terms of Altarelli-Parisi evolution, the BFKL equation, and Regge theor…

hep-ph1999★ 196 cited

HERWIG 6.1 Release Note

G. Corcella, I. G. Knowles, G. Marchesini +5

A new version of the Monte Carlo program HERWIG (version 6.1) is now available. This note gives brief details of the new features relative to the previous version (5.9). A fully up…

astro-ph1999

The formation epoch of massive ellipticals, as traced by radio galaxies

J. S. Dunlop

I review the current status of an on-going investigation into the stellar and dynamical ages of the oldest known galaxies at redshifts greater than 1. The spectroscopic data, when…

astro-ph1999★ 71 cited

The IRAS PSCz Dipole

M. Rowan-Robinson, J. Sharpe, S. J. Oliver +12

We use the PSCz IRAS galaxy redshift survey to analyze the cosmological galaxy dipole out to a distance 300 h Mpc. The masked area is filled in three different ways, firstly…

hep-th1999★ 43 cited

Space-Time Foam From Non-Commutative Instantons

Harry W. Braden, Nikita A. Nekrasov

We show that a U(1) instanton on non-commutative R^4 corresponds to a supersymmetric non-singular U(1) gauge field on a commutative Kahler manifold X which is a blowup of C^2 at a…

hep-ph1999

Neutral B Meson Mixing and Decay Constants from Lattice QCD

Laurent Lellouch, C. -J. David Lin

We present updates of our results for neutral -meson mixing and leptonic decay constants obtained in the quenched approximation from a mean-field-improved Sheikholeslami-Wohlert…

astro-ph1999★ 92 cited

Starburst galaxies and structure in the submillimetre background towards the Hubble Deep Field

J. A. Peacock, M. Rowan-Robinson, A. W. Blain +10

We use an 850-micron SCUBA map of the HDF to study the dust properties of optically-selected starburst galaxies at high redshift. Although the 850-micron map does not allow detecti…

astro-ph1999★ 67 cited

X-ray variability in a deep, flux limited sample of QSOs

O. Almaini, A. Lawrence, T. Shanks +6

We present an analysis of X-ray variability in a flux limited sample of QSOs. Selected from our deep ROSAT survey, these QSOs span a wide range in redshift () and are ty…

astro-ph1999★ 46 cited

Two-Dimensional Modelling of Optical HST and Infrared Tip-Tilt Images of Quasar Host Galaxies

R. J. McLure, J. S. Dunlop, M. J. Kukula

A description is given of the method used to extract quasar host-galaxy parameters from the deep Hubble Space Telescope quasar images presented by McLure et al. (1999) and Dunlop e…

math.DG1999★ 1 cited

Einstein metrics, hypercomplex structures and the Toda field equation

David M. J. Calderbank, Paul Tod

We obtain explicitly all solutions of the SU(infinity) Toda field equation with the property that the associated Einstein-Weyl space admits a 2-sphere of divergence-free shear-free…

math.DG1999★ 1 cited

Selfdual spaces with complex structures, Einstein-Weyl geometry and geodesics

David M. J. Calderbank, H. Pedersen

We study the Jones and Tod correspondence between selfdual conformal 4-manifolds with a conformal vector field and abelian monopoles on Einstein-Weyl 3-manifolds, and prove that in…

astro-ph1999★ 11 cited

The Correlation Between Galaxy HI Linewidths and K' Luminosities

B. Rothberg, W. Saunders, R. B. Tully +1

The relationship between galaxy luminosities and rotation rates is studied with total luminosities in the K' band. Extinction problems are essentially eliminated at this band cente…

hep-ph1999★ 109 cited

Resummation of Singlet Parton Evolution at Small x

Guido Altarelli, Richard D. Ball, Stefano Forte

We propose an improvement of the splitting functions at small x which overcomes the apparent problems encountered by the BFKL approach. We obtain a stable expansion for the x-evolu…

hep-lat1999★ 89 cited

Improved B -> pi l nu_l form factors from the lattice

UKQCD Collaboration, K. C. Bowler, L. Del Debbio +6

We present the results of a lattice computation of the form factors for B^0 ->pi^- l^+nu_l decays near zero-recoil. These results will allow a determination of the CKM matrix eleme…

astro-ph1999★ 2 cited

A Serendipitous Galaxy Cluster Survey with XMM: Expected Catalogue Properties and Scientific Applications

A. Kathy Romer, Pedro T. P. Viana, Andrew R. Liddle +1

This paper describes a serendipitous galaxy cluster survey that we plan to conduct with the XMM X-ray satellite. We have modeled the expected properties of such a survey for three…

astro-ph1999★ 272 cited

Massive Lossless Data Compression and Multiple Parameter Estimation from Galaxy Spectra

Alan Heavens, Raul Jimenez, Ofer Lahav

We present a method for radical linear compression of datasets where the data are dependent on some number of parameters. We show that, if the noise in the data is independent…

cond-mat.stat-mech1999★ 117 cited

Topological effects in ring polymers (II): Influence of persistence length

M. Muller, J. P. Wittmer, M. E. Cates

The interplay of topological constraints and persistence length of ring polymers in their own melt is investigated by means of dynamical Monte Carlo simulations of a three dimensio…

astro-ph1999★ 230 cited

The Time Scale of Escape from Star Clusters

T. Fukushige, D. C. Heggie

In this paper a cluster is modelled as a smooth potential (due to the cluster stars) plus the steady tidal field of the Galaxy. In this model there is a minimum energy below which…

cond-mat1999★ 4 cited

Persistence exponents in a 3D symmetric binary fluid mixture

V. M. Kendon, M. E. Cates, J-C. Desplat

The persistence exponent, theta, is defined by N_F sim t^theta, where t is the time since the start of the coarsening process and the "no-flip fraction", N_F, is the number of poin…

cond-mat.stat-mech1999★ 90 cited

Lattice-switch Monte Carlo

A. D. Bruce, A. N. Jackson, G. J. Ackland +1

We present a Monte Carlo method for the direct evaluation of the difference between the free energies of two crystal structures. The method is built on a lattice-switch transformat…

astro-ph1999★ 19 cited

Proto-Galactic Starbursts at High Redshift

Raul Jimenez, Paolo Padoan, James Dunlop +3

We have computed the evolving ultraviolet-millimeter spectral energy distribution (SED) produced by proto-galactic starbursts at high redshift, incorporating the chemical evolution…

astro-ph1999★ 4 cited

Reconstruction Analysis of the IRAS Point Source Catalog Redshift Survey

Vijay K. Narayanan, David H. Weinberg, E. Branchini +5

We present the results of reconstruction analysis of the galaxy distribution in a spherical region of radius 50 Mpc/h centered on the Local Group, as mapped by the IRAS Point Sourc…

hep-th1999★ 21 cited

More Ricci-flat branes

JM Figueroa-O'Farrill

Certain supergravity solutions (including domain walls and the magnetic fivebrane) have recently been generalised by Brecher and Perry by relaxing the condition that the brane worl…

hep-lat1999

An Investigation of the Soft Pion Relation in Quenched Lattice QCD

UKQCD Collaboration, K. C. Bowler, C. M. Maynard +6

A lattice determination of the form factor and decay constants for the semileptonic decay of heavy pseudoscalar (PS) mesons at zero recoil is presented from which the soft pion rel…