Comment on Gravity and the Poincare Group

Details Comment on Gravity and the Poincare Group Comment on Gravity and the Poincare Group

1993-02-11

arxiv.org/abs/hep-th/9302041v1

Phys.Rev. D48 (1993) 5029-5031

Physics

High Energy Physics

High Energy Physics - Theory

6 pages, LaTex, TUW9301

Scientific paper

10.1103/PhysRevD.48.5029

Following the approach of Grignani and Nardelli [1], we show how to cast the two-dimensional model $L \sim curv^2 + torsion^2 + cosm.const$ -- and in fact any theory of gravity -- into the form of a Poincare gauge theory. By means of the above example we then clarify the limitations of this approach: The diffeomorphism invariance of the action still leads to a nasty constraint algebra. Moreover, by simple changes of variables (e.g. in a path integral) one can reabsorb all the modifications of the original theory.

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