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11 papers · 2 filters
Non-amenability and spontaneous symmetry breaking -- The hyperbolic spin-chain
Max Niedermaier, Erhard Seiler
The hyperbolic spin chain is used to elucidate the notion of spontaneous symmetry breaking for a non-amenable internal symmetry group, here SO(1,2). The noncompact symmetry is show…
Moving vortices in noncommutative gauge theory
P. A. Horvathy, P. C. Stichel
Exact time-dependent solutions of nonrelativistic noncommutative Chern - Simons gauge theory are presented in closed analytic form. They are different from (indeed orthogonal to) t…
Resonant excitations of the 't Hooft-Polyakov monopole
Peter Forgacs, Mikhail S. Volkov
The spherically symmetric magnetic monopole in an SU(2) gauge theory coupled to a massless Higgs field is shown to possess an infinite number of resonances or quasinormal modes. Th…
On the number of instabilities of cosmological solutions in an Einstein-Yang-Mills system
Péter Forgács, Sébastien Reuillon
A detailed numerical stability analysis of the static, spherically symmetric globally regular solutions of the Einstein-Yang-Mills equations with a positive cosmological constant,…
Galilean noncommutative gauge theory: symmetries & vortices
P. A. Horvathy, L. Martina, P. C. Stichel
Noncommutative Chern-Simons gauge theory coupled to nonrelativistic scalars or spinors is shown to admit the ``exotic'' two-parameter-centrally extended Galilean symmetry, realized…
Vanishing of the conformal anomaly for strings in a gravitational wave
C. Duval, Z. Horvath, P. A. Horvathy
Using the non-symmetric-connection approach proposed by Osborn, we demonstrate that, for a bosonic string in a specially chosen plane-fronted gravitational wave and an axion backgr…