Imperial College London

Claudia de Rham

Faculty of Natural SciencesDepartment of Physics

Professor of Theoretical Physics



+44 (0)20 7594 CV




506Blackett LaboratorySouth Kensington Campus






BibTex format

author = {de, Rham C and Tolley, AJ and Zhou, S-Y},
doi = {10.1016/j.physletb.2016.07.035},
journal = {Physics Letters B},
pages = {579--583},
title = {Non-compact nonlinear sigma models},
url = {},
volume = {760},
year = {2016}

RIS format (EndNote, RefMan)

AB - 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 Λ2 decoupling limit can be defined on these vacua.
AU - de,Rham C
AU - Tolley,AJ
AU - Zhou,S-Y
DO - 10.1016/j.physletb.2016.07.035
EP - 583
PY - 2016///
SN - 0370-2693
SP - 579
TI - Non-compact nonlinear sigma models
T2 - Physics Letters B
UR -
UR -
UR -
VL - 760
ER -