کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1842649 1031474 2006 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transverse Fierz–Pauli symmetry
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
Transverse Fierz–Pauli symmetry
چکیده انگلیسی

We consider some flat space theories for spin 2 gravitons, with less invariance than full diffeomorphisms. For the massless case, classical stability and absence of ghosts require invariance under transverse diffeomorphisms (TDiff)(TDiff), hμν↦hμν+2∂(νξμ)hμν↦hμν+2∂(νξμ), with ∂μξμ=0∂μξμ=0. Generic TDiff invariant theories contain a propagating scalar, which disappears if the symmetry is enhanced in one of two ways. One possibility is to consider full diffeomorphisms (Diff)(Diff). The other (which we denote WTDiff) adds a Weyl symmetry, by which the Lagrangian becomes independent of the trace. The first possibility corresponds to General Relativity, whereas the second corresponds to “unimodular” gravity (in a certain gauge). Phenomenologically, both options are equally acceptable. For massive gravitons, the situation is more restrictive. Up to field redefinitions, classical stability and absence of ghosts lead directly to the standard Fierz–Pauli Lagrangian. In this sense, the WTDiff theory is more rigid against deformations than linearized GR, since a mass term cannot be added without provoking the appearance of ghosts.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 756, Issue 3, 13 November 2006, Pages 148–170
نویسندگان
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