Warped backgrounds in five-dimensional models can provide solutions to various hierarchy problems in particle physics if the Standard Model matter is associated with the zero modes of bulk fields with non-trivial profiles along the extra dimension. We investigate the case of a conformally coupled massless scalar. This field possesses a zero mode whose action density is exponentially enhanced along the transverse direction in a warped background, i.e., near the negative tension brane in the RS setting. At the zero mode level effective 5D composites of this scalar and its derivatives, which are suppressed by powers of the fundamental gravitational scale, yield 4D interactions of electroweak strength. This suggests a certain importance of conformally coupled scalar fields for extra-dimensional model building.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Mar 20 2003|
Bibliographical noteFunding Information:
One of us (R.H.) would like to thank N. Tetradis for a stimulating conversation and Z. Tavartkiladze for various discussions. M.P. is partly supported by the NSERC of Canada and PPARC of the UK.