A nonlinear short-wavelength approximation for eccentric waves in discs yields conditions for steepening of nonlinearity and eccentricity, with solutions bounded by linear WKB results.
M., Lithwick Y., 2018, arXiv e-prints, http://adsabs.harvard.edu/abs/2018arXiv181111758L
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Focusing of nonlinear eccentric waves in astrophysical discs
A nonlinear short-wavelength approximation for eccentric waves in discs yields conditions for steepening of nonlinearity and eccentricity, with solutions bounded by linear WKB results.