Lump dynamics in the CP^1 model on the torus

Details Lump dynamics in the CP^1 model on the torus Lump dynamics in the CP^1 model on the torus

1997-07-10

arxiv.org/abs/hep-th/9707101v1

Commun.Math.Phys. 194 (1998) 513-539

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, Latex, 7 postscript figures

Scientific paper

10.1007/s002200050367

The topology and geometry of the moduli space, M_2, of degree 2 static solutions of the CP^1 model on a torus (spacetime T^2 x R) are studied. It is proved that M_2 is homeomorphic to the left coset space G/G_0 where G is a certain eight-dimensional noncompact Lie group and G_0 is a discrete subgroup of order 4. Low energy two-lump dynamics is approximated by geodesic motion on M_2 with respect to a metric g defined by the restriction to M_2 of the kinetic energy functional of the model. This lump dynamics decouples into a trivial ``centre of mass'' motion and nontrivial relative motion on a reduced moduli space. It is proved that (M_2,g) is geodesically incomplete and has only finite diameter. A low dimensional geodesic submanifold is identified and a full description of its geodesics obtained.

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