Nonlinearity of perturbations in PT-symmetric quantum mechanics

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00509984" target="_blank" >RIV/61389005:_____/19:00509984 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/1742-6596/1194/1/012120" target="_blank" >http://dx.doi.org/10.1088/1742-6596/1194/1/012120</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/1194/1/012120" target="_blank" >10.1088/1742-6596/1194/1/012120</a>

Result language

angličtina

Original language name

Nonlinearity of perturbations in PT-symmetric quantum mechanics

Original language description

In the so called crypto-Hermitian formulation of quantum theory (incorporating, in particular, the PT -symmetric quantum mechanics as its special case) the unitary evolution of a system is known to be described via an apparently redundant representation of the states in a triplet of Hilbert spaces. Two of them are unitarily equivalent while the auxiliary, zeroth one is unphysical but exceptionally user-friendly. The dynamical evolution equations are, naturally, solved in the friendliest space H(0). The evaluation of experimental predictions then requires a Hermitization of the observables. This yields, as its byproduct, the correct physical Hilbert space H(1). The formalism offers the conventional probabilistic interpretation due to the Dyson-proposed unitary equivalence between H(1)and a certain conventional but prohibitively complicated textbook space H(2). The key merit of the innovation lies in its enhanced flexibility opening new ways towards nonlocal or complex-interaction unitary models. The price to pay is that the ad hoc inner product in the relevant physical Hilbert space H(1) is, by construction, Hamiltonian-dependent. We show that this implies that the Rayleigh-Schrödinger perturbation theory must be used with due care. The warning is supported by an elementary sample of quantum system near its exceptional-point phase transition. In contrast to a naive expectation, the model proves stable with respect to the admissible, self-consistently specified (i.e., physical) small perturbations.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/GA16-22945S" target="_blank" >GA16-22945S: Quantum Wheeler-DeWitt equation and its unitary evolution interpretation</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Journal of Physics: Conference series

ISBN

—

ISSN

1742-6588

e-ISSN

—

Number of pages

8

Pages from-to

012120

Publisher name

IOP

Place of publication

Bristol

Event location

Prague

Event date

Jul 8, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000537619600118