Details

Autor(en) / Beteiligte

• Abhinav, K.
• Shukla, A.
• Panigrahi, P. K.

Titel

Novel symmetries in Weyl-invariant gravity with massive gauge field

Ist Teil von

• The European physical journal. C, Particles and fields, 2016-11, Vol.76 (11), p.1, Article 639

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The background field method is used to linearize the Weyl-invariant scalar–tensor gravity, coupled with a Stückelberg field. For a generic background metric, this action is found not to be invariant, under both a diffeomorphism and generalized Weyl symmetry, the latter being a combination of gauge and Weyl transformations. Interestingly, the quadratic Lagrangian, emerging from a background of Minkowski metric, respects both transformations independently . The Becchi–Rouet–Stora–Tyutin symmetry of scalar–tensor gravity coupled with a Stückelberg-like massive gauge particle, possessing a diffeomorphism and generalized Weyl symmetry, reveals that in both cases negative-norm states with unphysical degrees of freedom do exist. We then show that, by combining diffeomorphism and generalized Weyl symmetries, all the ghost states decouple, thereby removing the unphysical redundancies of the theory. During this process, the scalar field does not represent any dynamic mode, yet modifies the usual harmonic gauge condition through non-minimal coupling with gravity.