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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.33 no.s1 (2006), pp. 311-319
Contractions of Sigma Models and Integration of Massive Modes
M.A. Lledó1, O. Maciá1,2
1Departamento de Física Teórica, Universidad de Valencia and IFIC, C/ Dr. Moliner, 50, 46.100, Burjassot, Valencia, Spain
2Department of Physics, Theory Division CERN, CH 1211 Geneva 23, Switzerland
go back1Departamento de Física Teórica, Universidad de Valencia and IFIC, C/ Dr. Moliner, 50, 46.100, Burjassot, Valencia, Spain
2Department of Physics, Theory Division CERN, CH 1211 Geneva 23, Switzerland
Abstract. We show how the integration of massive modes after a spontaneous symmetry breaking in a sigma model can often be interpreted as a contraction, induced by a group contraction, of the target space of the sigma model.