How massless are massless fields in $AdS_d$

Details How massless are massless fields in $AdS_d$ How massless are massless fields in $AdS_d$

2000-05-15

arxiv.org/abs/hep-th/0005136v3

Nucl.Phys.B586:183-205,2000

Physics

High Energy Physics

High Energy Physics - Theory

23 pages, LaTeX, a few typos corrected

Scientific paper

10.1016/S0550-3213(00)00402-8

Massless fields of generic Young symmetry type in $AdS_d$ space are analyzed. It is demonstrated that in contrast to massless fields in Minkowski space whose physical degrees of freedom transform in irreps of $o(d-2)$ algebra, $AdS$ massless mixed symmetry fields reduce to a number of irreps of $o(d-2)$ algebra. From the field theory perspective this means that not every massless field in flat space admits a deformation to $AdS_d$ with the same number of degrees of freedom, because it is impossible to keep all of the flat space gauge symmetries unbroken in the AdS space. An equivalent statement is that, generic irreducible AdS massless fields reduce to certain reducible sets of massless fields in the flat limit. A conjecture on the general pattern of the flat space limit of a general $AdS_d$ massless field is made. The example of the three-cell ``hook'' Young diagram is discussed in detail. In particular, it is shown that only a combination of the three-cell flat-space field with a graviton-like field admits a smooth deformation to $AdS_d$.

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