2D gravity without test particles is pointless (Comment on hep-th/0011136)
D.Grumiller, D.Hofmann, W.Kummer
TL;DR
This paper critically examines claims of Weyl invariance in arbitrary 2D dilaton gravity theories, questioning the validity of such invariance without test particles.
Contribution
It provides a critical analysis challenging the generality of Weyl invariance claims in 2D dilaton gravity models.
Findings
Weyl invariance claims are not universally valid in 2D dilaton theories
Test particles are essential to assess physical equivalence under Weyl transformations
The critique clarifies misconceptions about symmetry in 2D gravity models
Abstract
Claims of a general Weyl invariance of an arbitrary 2D dilaton theory are critically discussed.
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