Three-Hilbert-Space Formulation of Quantum Mechanics

• Опубліковано в: Symmetry, Integrability and Geometry: Methods and Applications
• Дата: 2009
• ISSN: 1815-0659
• Автор: Znojil, M.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: Інститут математики НАН України 2009
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/149281
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Three-Hilbert-Space Formulation of Quantum Mechanics / M. Znojil // Symmetry, Integrability and Geometry: Methods and Applications. — 2009. — Т. 5. — Бібліогр.: 25 назв. — англ.

In paper [Znojil M., Phys. Rev. D 78 (2008), 085003, 5 pages, arXiv:0809.2874] the two-Hilbert-space (2HS, a.k.a. cryptohermitian) formulation of Quantum Mechanics has been revisited. In the present continuation of this study (with the spaces in question denoted as H(auxiliary) and H(standard)) we spot a weak point of the 2HS formalism which lies in the double role played by H(auxiliary). As long as this confluence of roles may (and did!) lead to confusion in the literature, we propose an amended, three-Hilbert-space (3HS) reformulation of the same theory. As a byproduct of our analysis of the formalism we offer an amendment of the Dirac's bra-ket notation and we also show how its use clarifies the concept of covariance in time-dependent cases. Via an elementary example we finally explain why in certain quantum systems the generator H(gen) of the time-evolution of the wave functions may differ from their Hamiltonian H.