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Scale invariance and spontaneous symmetry breaking |
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| Institution: | 1. Institut für Theoretische Physik, Universität Hannover, D-3000 Hannover, Fed. Rep. Germany;2. Deutsches Elektronen-Synchrotron DESY, D-2000 Hamburg, Fed. Rep. Germany;1. Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands;2. Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, ON N2L 2Y5, Canada |
| Abstract: | Spontaneous breaking of gauge symmetries is studied in theories with nonlinearly realized scale invariance. The classically sliding vacuum expectation values are fixed through quantum corrections. The anomaly of the dilatation current determines the vacuum energy density as well as the dilaton mass. The coupling of gravity to matter is modified in such a way that the cosmological constant vanishes. |
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