Jerónimo Cortez et al 2008 Class. Quantum Grav. 25 105005 doi:10.1088/0264-9381/25/10/105005
Uniqueness of the Fock representation of the Gowdy S1 × S2 and S3 models
Jerónimo Cortez1, Guillermo A Mena Marugán2 and José M Velhinho3
Show affiliationsAfter a suitable gauge fixing, the local gravitational degrees of freedom of the Gowdy S1 × S2 and S3 cosmologies are encoded in an axisymmetric field on the sphere S2. Recently, it has been shown that a standard field parametrization of these reduced models admits no Fock quantization with a unitary dynamics. This lack of unitarity is surpassed by a convenient redefinition of the field and the choice of an adequate complex structure. The result is a Fock quantization where both the dynamics and the SO(3)-symmetries of the field equations are unitarily implemented. The present work proves that this Fock representation is in fact unique inasmuch as, up to equivalence, there exists no other possible choice of SO(3)-invariant complex structure leading to a unitary implementation of the time evolution.
- PACS
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11.30.Ly Other internal and higher symmetries
- MSC
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83C45 Quantization of the gravitational field
- Subjects
- Dates
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Issue 10 (21 May 2008)
Received 19 February 2008
Published 29 April 2008
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Uniqueness of the Fock representation of the Gowdy S1 × S2 and S3 models
Jerónimo Cortez et al 2008 Class. Quantum Grav. 25 105005
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