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quant-ph2006
On the unitarity of higher-dervative and nonlocal theories
Katarzyna Bolonek, Piotr Kosinski
We consider two simple models of higher-derivative and nonlocal quantu systems.It is shown that, contrary to some claims found in literature, they can be made unitary.
quant-ph2006
Comment on "Dirac Quantization of Pais-Uhlenbeck Fourth Order Oscillator"
Katarzyna Bolonek, Piotr Kosinski
The structure of Pais-Uhlenbeck oscillator in the equal-frequency limit has been recently studied by Mannheim and Davidson [Phys.Rev. A71 (2005), 042110]. It appears that taking th…
quant-ph2005★ 17 cited
Hamiltonian structures for Pais-Uhlenbeck oscillator
Katarzyna Bolonek, Piotr Kosinski
The hamiltonian structures for quartic oscillator are considered. All structures admitting quadratic hamiltonians are classified.