No-go theorem for gravivector and graviscalar on the brane
Abstract
Description
We prove the no-go theorem that the gravivector $(h_{5μ})$ and graviscalar $(h_{55})$ cannot have any on-shell propagation on the Randall-Sundrum (RS) brane. For this purpose, we analyze all of their linearized equations with the de Donder gauge (5D transverse-tracefree gauge).
But we do not introduce any matter source. We use the Z$_2$-symmetry argument and their ($h_{5μ}, h_{55}$) compatibility conditions with the tensor $h_{\mn}$-equation. It turns out that $h_{55}$ does not have any bulk (massive) and brane (massless) propagations. Although $h_{5μ}$ has a sort of massive propagations, they do not belong to the physical solution. Hence we confirm that the Randall-Sundrum gauge suffices the on-shell brane physics.
9 pages, comments and references added
9 pages, comments and references added