Quadratic PT-symmetric operators with real spectrum and similarity to
self-adjoint operators [PDF]
Emanuela Caliceti, Sandro Graffi, Michael Hitrik, Johannes SjoestrandIt is established that a PT-symmetric elliptic quadratic differential operator with real spectrum is similar to a self-adjoint operator precisely when the associated fundamental matrix has no Jordan blocks.View original: http://arxiv.org/abs/1204.6605
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