Classical general relativity as BF-Plebanski theory with linear constraints

Details Classical general relativity as BF-Plebanski theory with linear constraints Classical general relativity as BF-Plebanski theory with linear constraints

2010-04-29

arxiv.org/abs/1004.5371v4

Class. Quantum Grav. 27 (2010) 185017

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages, revtex, changed one cross-reference in sect. IIIC to match journal version

Scientific paper

10.1088/0264-9381/27/18/185017

We investigate a formulation of continuum 4d gravity in terms of a constrained BF theory, in the spirit of the Plebanski formulation, but involving only linear constraints, of the type used recently in the spin foam approach to quantum gravity. We identify both the continuum version of the linear simplicity constraints used in the quantum discrete context and a linear version of the quadratic volume constraints that are necessary to complete the reduction from the topological theory to gravity. We illustrate and discuss also the discrete counterpart of the same continuum linear constraints. Moreover, we show under which additional conditions the discrete volume constraints follow from the simplicity constraints, thus playing the role of secondary constraints.

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