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Mathematics, Analysis of PDEs, math.AP,
Abstract:
The purpose of this note is to prove the existence of a conformal scattering
operator for the cubic defocusing wave equation on a non-stationary background.
The proof essentially relies on solving the characteristic initial value
problem by the method developed by H\"ormander. This method consists in slowing
down the propagation speed of the waves to transform a characteristic initial
value problem into a standard Cauchy problem.