Effective metric in nonlinear scalar field theories
classification
🌀 gr-qc
keywords
effectivemetricfieldscalarnonlineartheoriesaccordingallowed
read the original abstract
We discuss several features of the propagation of perturbations in nonlinear scalar field theories using the effective metric. It is shown that the effective metric can be classified according to whether the gradient of the scalar field is timelike, null, or spacelike, and this classification is illustrated with two examples. We shall also show that different signatures for the effective metric are allowed.
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