On gravitational defects, particles and strings

Details On gravitational defects, particles and strings On gravitational defects, particles and strings

2008-07-20

arxiv.org/abs/0807.3188v1

JHEP 0809:126,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

30 pages, no figures

Scientific paper

10.1088/1126-6708/2008/09/126

We study the inclusion of point and string matter in the deSitter gauge theory, or MacDowell-Mansouri formulation of four dimensional gravity. We proceed by locally breaking the gauge symmetries of general relativity along worldlines and worldsheets embedded in the spacetime manifold. Restoring full gauge invariance introduces new dynamical fields which describe the dynamics of spinning matter coupled to gravity. We discuss the physical interpretation of the obtained formalism by studying the flat limit and the spinless case on arbitrary backgrounds. It turns out that the worldline action describes a massive spinning particle, while the worldsheet action contains the Nambu-Goto string augmented with spinning contributions. Finally, we study the gravity/matter variational problem and conclude by discussing potential applications of the formalism to the inclusion of the Nambu-Goto string in spinfoam models of four dimensional quantum gravity.

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