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2+1 gravity and Doubly Special Relativity

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arxiv hep-th/0307085 v2 pith:RC44YNIH submitted 2003-07-08 hep-th

2+1 gravity and Doubly Special Relativity

classification hep-th
keywords algebragravitydimensionsdoublyparticlerelativityspecialambiguity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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It is shown that gravity in 2+1 dimensions coupled to point particles provides a nontrivial example of Doubly Special Relativity (DSR). This result is obtained by interpretation of previous results in the field and by exhibiting an explicit transformation between the phase space algebra for one particle in 2+1 gravity found by Matschull and Welling and the corresponding DSR algebra. The identification of 2+1 gravity as a $DSR$ system answers a number of questions concerning the latter, and resolves the ambiguity of the basis of the algebra of observables. Based on this observation a heuristic argument is made that the algebra of symmetries of ultra high energy particle kinematics in 3+1 dimensions is described by some DSR theory.

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