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Exceptional points and cusp singularities in relativistic stellar oscillations with causal bulk relaxation
Causal relativistic hydrodynamics introduces relaxation degrees of freedom that elevate a quadratic oscillation problem to a cubic non-Hermitian spectral pencil. We study its exceptional-point (EP2) curves and an $A_3$ cusp, and construct an exactly solvable radiating wave--relaxation problem with a
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