Fractional Helmholtz operators admit high-frequency geometrical optics solutions, and for s≥1/2 these give Hölder stable recovery of the potential from multi-frequency boundary Cauchy data.
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Geometrical optics for the fractional Helmholtz equation and applications to inverse problems
Fractional Helmholtz operators admit high-frequency geometrical optics solutions, and for s≥1/2 these give Hölder stable recovery of the potential from multi-frequency boundary Cauchy data.