On the Real Spectra of Calogero Model with Complex Coupling
Pijush K. Ghosh, Kumar S. Gupta
Abstract
We study the eigenvalue problem of the rational Calogero model with the coupling of the inverse-square interaction as a complex number. We show that although this model is manifestly non-invariant under the combined parity and time-reversal symmetry PT, the eigenstates corresponding to the zero value of the generalized angular momentum have real energies.
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