Abstract
We present the shock-free wave propagation requirements for massless fields.First, we briefly argue how the “completely exceptional” approach, originallydeveloped to study the characteristics of hyperbolic systems in 1 + 1 dimensions,can be generalized to higher dimensions and used to describe propagation withoutemerging shocks, with characteristic flow remaining parallel along the waves.We then study the resulting requirements for scalar, vector, vector-scalar, andgravity models and characterize physically acceptable actions in each case.
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McCarthy, J., Sario~glu, Ö. Shock-Free Wave Propagation in Gauge Theories. International Journal of Theoretical Physics 39, 159–182 (2000). https://doi.org/10.1023/A:1003659520136
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DOI: https://doi.org/10.1023/A:1003659520136