Uniqueness of the Representation in Homogeneous Isotropic LQC

Engle J, Hanusch M, Thiemann T (2017)


Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Publisher: SPRINGER

Book Volume: 354

Pages Range: 231-246

Journal Issue: 1

DOI: 10.1007/s00220-017-2881-2

Abstract

We show that the standard representation of homogeneous isotropic loop quantum cosmology (LQC) is the GNS-representation that corresponds to the unique state on the reduced quantum holonomy-flux *-algebra that is invariant under residual diffeomorphisms-both when the standard algebra is used as well as when one uses the extended algebra proposed by Fleischhack. More precisely, we find that in both situations the GNS-Hilbert spaces coincide, and that in the Fleischhack case the additional algebra elements are just mapped to zero operators. In order for the residual diffeomorphisms to have a well-defined action on the quantum algebra, we have let them act on the fiducial cell as well as on the dynamical variables, thereby recovering covariance. Consistency with Ashtekar and Campilgia in the Bianchi case is also shown.

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APA:

Engle, J., Hanusch, M., & Thiemann, T. (2017). Uniqueness of the Representation in Homogeneous Isotropic LQC. Communications in Mathematical Physics, 354(1), 231-246. https://doi.org/10.1007/s00220-017-2881-2

MLA:

Engle, Jonathan, Maximilian Hanusch, and Thomas Thiemann. "Uniqueness of the Representation in Homogeneous Isotropic LQC." Communications in Mathematical Physics 354.1 (2017): 231-246.

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