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Hamiltonian and physical Hilbert space in polymer quantum mechanics

Alejandro Corichi1,2,3, Tatjana Vukašinac4 and José A Zapata1

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In this paper, a version of polymer quantum mechanics, which is inspired by loop quantum gravity, is considered and shown to be equivalent, in a precise sense, to the standard, experimentally tested Schrödinger quantum mechanics. The kinematical cornerstone of our framework is the so-called polymer representation of the Heisenberg–Weyl (HW) algebra, which is the starting point of the construction. The dynamics is constructed as a continuum limit of effective theories characterized by a scale, and requires a renormalization of the inner product. The result is a physical Hilbert space in which the continuum Hamiltonian can be represented and that is unitarily equivalent to the Schrödinger representation of quantum mechanics. As a concrete implementation of our formalism, the simple harmonic oscillator is fully developed.


PACS

04.60.Pp Loop quantum gravity, quantum geometry, spin foams

03.65.Fd Algebraic methods

03.65.Ge Solutions of wave equations: bound states

MSC

81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other quantum-mechanical equations

83C45 Quantization of the gravitational field

81Rxx Groups and algebras in quantum theory

Subjects

Gravitation and cosmology

Quantum information and quantum mechanics

Dates

Issue 6 (21 March 2007)

Received 19 October 2006, in final form 25 January 2007

Published 6 March 2007



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