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Decoupling in supersymmetric theories |
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| Affiliation: | 1. Physics Department, Faculty of Sciences, Arak University, Arak 38156-8-8349, Iran;2. Departamento de Física, Universidad de Santiago de Chile, Casilla 307, Santiago, Chile;1. Department of Physics, University of Athens, University Campus, Zographou 157 84, Greece;2. Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università di Padova, Via Marzolo 8, 35131 Padova, Italy;3. INFN, Sezione di Padova, Via Marzolo 8, 35131 Padova, Italy;4. Physics Division, National Technical University of Athens, 15780 Zografou Campus, Athens, Greece |
| Abstract: | We examine the decoupling of massive states in supergravity theories. Using superspace functional techniques to “integrate out” the massive modes we derive the effective low-energy lagrangian. The technique is extended to the case of large supersymmetry breaking and we show how the effective lagrangian correctly accounts for vacuum expectation values of massive fields. We discuss the structure of effective theories following from the superstring in which the effects of Kaluza-Klein modes and states massive after intermediate scale breaking are included. It is shown in the case of large intermediate scale breaking the theory should possess discrete symmetries to protect light states from large supersymmetry breaking and we list the conditions for viable models. |
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