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A note on the Hamiltonian constraint in canonical GR

László B Szabados

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The Hamiltonian constraint of the coupled Einstein–Yang–Mills–Higgs system with a cosmological constant is shown to be a pure Poisson bracket of a dimensionless functional on the phase space and the volume of the three-space. One of its potential consequences, a restriction on the eigenstates of the volume operator in a class of canonical quantum gravity theories, is also pointed out.


PACS

04.60.Ds Canonical quantization

04.20.Fy Canonical formalism, Lagrangians, and variational principles

98.80.Es Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)

MSC

83C05 Einstein's equations (general structure, canonical formalism, Cauchy problems)

83F05 Cosmology

85A40 Cosmology (For relativistic cosmology, see 83F05)

70H45 Constrained dynamics, Dirac's theory of constraints (See also 70F20, 70F25, 70Gxx)

Subjects

Gravitation and cosmology

Astrophysics and astroparticles

Dates

Issue 9 (7 May 2008)

Received 28 November 2007, in final form 11 February 2008

Published 15 April 2008



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