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Short distance properties from large distance behaviour. (1998)
Journal Article
Mansfield, P., Pachos, J., & Sampaio, M. (1998). Short distance properties from large distance behaviour. International Journal of Modern Physics A, 13(23), 4101-4122. https://doi.org/10.1142/s0217751x9800192x

For slowly varying fields the vacuum functional of a quantum field theory may be expanded in terms of local functionals. This expansion satisfies its own form of the Schrödinger equation from which the expansion coefficients can be found. For scalar... Read More about Short distance properties from large distance behaviour..

Almost all S-integer dynamical systems have many periodic points (1998)
Journal Article
Ward, T. (1998). Almost all S-integer dynamical systems have many periodic points. Ergodic Theory and Dynamical Systems, 18(2), 471-486. https://doi.org/10.1017/s0143385798113378

We show that for almost every ergodic S-integer dynamical system the radius of convergence of the dynamical zeta function is no larger than exp(-[1/2]htop) < 1. In the arithmetic case almost every zeta function is irrational. We conjecture that for a... Read More about Almost all S-integer dynamical systems have many periodic points.

Target-driven perceptual grouping (1998)
Presentation / Conference Contribution
Jermyn, I., Jacobs, D., & Geiger, D. (1998, June). Target-driven perceptual grouping. Presented at First IEEE Computer Society Workshop on Perceptual Organization in Computer Vision., Santa Barbara, USA

Classical backgrounds and scattering for affine Toda theory on a half-line (1998)
Journal Article
Bowcock, P. (1998). Classical backgrounds and scattering for affine Toda theory on a half-line. Journal of High Energy Physics, 1998(05), Article 008. https://doi.org/10.1088/1126-6708/1998/05/008

We find classical solutions to the simply-laced affine Toda equations which satisfy integrable boundary conditions using solitons which are analytically continued from imaginary coupling theories. Both static `vacuum' configurations and time-dependen... Read More about Classical backgrounds and scattering for affine Toda theory on a half-line.

Twistors, geometry and integrable systems. (1998)
Book Chapter
Ward, R. (1998). Twistors, geometry and integrable systems. In S. A. Huggett, L. J. Mason, K. Tod, S. Tsou, & N. Woodhouse (Eds.), The Geometric Universe: Science, Geometry, and the Work of Roger Penrose (99-108). Oxford University Press