Friday, November 9, 2012

1211.1848 (Eemeli Blåsten et al.)

Do corners always scatter?    [PDF]

Eemeli Blåsten, Lassi Päivärinta, John Sylvester
We study time harmonic scattering for the Helmholtz equation in Rn. We show that certain penetrable scatterers with rectangular corners scatter every incident wave nontrivially. Even though these scatterers have interior transmission eigenvalues, the relative scattering (a.k.a. far field) operator has a trivial kernel and cokernel at every real wavenumber.
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