Spinors and the reference point of quasilocal energy

Abstract

This paper investigates the relationship between the quasilocal energy of Brown and York and certain spinorial expressions for gravitational energy constructed from the Witten-Nester integral. A key feature of the Brown-York method for defining quasilocal energy is that it allows for the freedom to assign the reference point of the energy. When possible, it is perhaps most natural to reference the energy against flat space, i.e. assign flat-space the zero value of energy. It is demonstrated that the Witten-Nester integral when evaluated on solution spinors to the Sen-Witten equation (obeying appropriate boundary conditions) is essentially the Brown-York quasilocal energy with a reference point determined by the Sen-Witten spinors. For the case of round spheres in the Schwarzschild geometry, these spinors determine the flat-space reference point. A similar viewpoint is proposed for the Schwarzschild-case quasilocal energy of Dougan and Mason.

27 pages, title changed and minor revisions made based on referees' Reports, to appear in Class. Quantum Grav

References in corpus (3)

• Quasilocal Energy and Conserved Charges Derived from the Gravitational Action
• The Microcanonical Functional Integral. I. The Gravitational Field
• Canonical variables and quasilocal energy in general relativity

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• Angular momentum and an invariant quasilocal energy in general relativity
• Quasilocal Energy-Momentum for Geometric Gravity Theories
• Nonlinear Perturbations and Conservation Laws on Curved Backgrounds in GR and Other Metric Theories
• New variables, the gravitational action, and boosted quasilocal stress-energy-momentum