Extended matter coupled to BF theory

Details Extended matter coupled to BF theory Extended matter coupled to BF theory

2007-09-26

arxiv.org/abs/0709.4235v1

Phys.Rev.D78:024013,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

27 pages, 7 figures

Scientific paper

10.1103/PhysRevD.78.024013

Recently, a topological field theory of membrane-matter coupled to BF theory in arbitrary spacetime dimensions was proposed [1]. In this paper, we discuss various aspects of the four-dimensional theory. Firstly, we study classical solutions leading to an interpretation of the theory in terms of strings propagating on a flat spacetime. We also show that the general classical solutions of the theory are in one-to-one correspondence with solutions of Einstein's equations in the presence of distributional matter (cosmic strings). Secondly, we quantize the theory and present, in particular, a prescription to regularize the physical inner product of the canonical theory. We show how the resulting transition amplitudes are dual to evaluations of Feynman diagrams coupled to three-dimensional quantum gravity. Finally, we remove the regulator by proving the topological invariance of the transition amplitudes.

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