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- W2224334989 abstract "The target space of a nonlinear sigma model is usually required to be positive definite to avoid ghosts. We introduce a unique class of nonlinear sigma models where the target space metric has a Lorentzian signature, thus the associated group being non-compact. We show that the would-be ghost associated with the negative direction is fully projected out by 2 second-class constraints, and there exist stable solutions in this class of models. This result also has important implications for Lorentz--invariant massive gravity: There exist stable nontrivial vacua in massive gravity that are free from any linear vDVZ--discontinuity and a $Lambda_2$ decoupling limit can be defined on these vacua." @default.
- W2224334989 created "2016-06-24" @default.
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- W2224334989 date "2016-09-01" @default.
- W2224334989 modified "2023-09-23" @default.
- W2224334989 title "Non-compact nonlinear sigma models" @default.
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- W2224334989 doi "https://doi.org/10.1016/j.physletb.2016.07.035" @default.
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