Gauge bosons in a five-dimensional theory with localized gravity

Abstract

We consider the possibility of gauge bosons living in the recently proposed fivedimensional theory with localized gravity. We study the mass spectrum of the Kaluza-Klein (KK) excitations of the gauge fields and calculate their couplings to the boundaries of the fifth dimension. We find a different behaviour from the case of the graviton. In particular, we find that the massless mode is not localized in the extra dimension and that the KK excitations have sizeable couplings to the two boundaries. We also discuss possible phenomenological implications for the case of the standard model gauge bosons.

Localization of scalar and tensor fields in the standing wave braneworld with increasing warp factor

“…However, there are difficulties to realize such mechanism with exponentially warped space-times. In the existing (1+4)-dimensional models spin 0 and spin 2 fields can be localized on the brane with the decreasing warp factor [2], spin 1/2 field can be localized with the increasing factor [6], and spin 1 fields are not localized at all [7]. For the case of (1+5)-dimensions it was found that spin 0, spin 1 and spin 2 fields are localized on the brane with the decreasing warp factor and spin 1/2 fields again are localized with the increasing factor [8].…”

Measuring the shape of the extra dimension

“…Moreover, it does not appear proper to consider the above KK potential as a perturbation on the flat background V = 0 because of the singularity at z = 0; the integral of V AdS diverges in the interval 0 ≤ z ≤ L. On the other hand, if the warp factor is exactly AdS, then the KK spectrum is given by roots of Bessel functions [18,19] and should be identifiable. Therefore in the following we assume a KK spectrum that can be roughly, but not exactly, identified with that coming from a known background such as the AdS, suggesting that the real geometry only slightly deviates from the known background and could be considered as perturbations.…”

Localization of gauge bosons in the 5D standing wave braneworld

“…However, there are difficulties to realize this mechanism with exponentially warped space-times. In the existing (1+4)-dimensional models spin 0 and spin 2 fields can be localized on the brane with the decreasing warp factor [2], spin 1/2 field can be localized with the increasing factor [4], and spin 1 fields are not localized at all [5]. In the case of 6D models it was found that spin 0, spin 1 and spin 2 fields are localized on the brane with the decreasing warp factor and spin 1/2 fields again are localized with the increasing factor [6].…”