Quantization of pure gravitational plane waves

Details Quantization of pure gravitational plane waves Quantization of pure gravitational plane waves

1998-06-26

arxiv.org/abs/gr-qc/9806105v1

Phys.Rev. D58 (1998) 104017

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, Revtex, no figures

Scientific paper

10.1103/PhysRevD.58.104017

Pure gravitational plane waves are considered as a special case of spacetimes with two commuting spacelike Killing vector fields. Starting with a midisuperspace that describes this kind of spacetimes, we introduce gauge-fixing and symmetry conditions that remove all non-physical degrees of freedom and ensure that the classical solutions are plane waves. In this way, we arrive at a reduced model with no constraints and whose only degrees of freedom are given by two fields. In a suitable coordinate system, the reduced Hamiltonian that generates the time evolution of this model turns out to vanish, so that all relevant information is contained in the symplectic structure. We calculate this symplectic structure and particularize our discussion to the case of linearly polarized plane waves. The reduced phase space can then be described by an infinite set of annihilation and creation like variables. We finally quantize the linearly polarized model by introducing a Fock representation for these variables.

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