No abstract

We study the 5D Rarita-Schwinger fields to describe spin 3=2 baryons in AdS/QCD. We calculate the spectrum of spin 3=2 baryons (Á resonances) and their form factors, together with meson-baryon couplings from AdS/QCD. The transition form factors between Á and nucleon are evaluated. Both pion and rho meson couplings have the same origin in the bulk and hence are unified. The numerical values for the meson-baryon transition couplings are roughly consistent with the values obtained from other methods. We also predict the numerical values of some new couplings associated with Á resonances.

We construct the general 1/2 BPS M2 giant graviton solutions asymptotic to the elevendimensional maximally supersymmetric plane wave background, based on the recent work of Lin, Lunin and Maldacena. The solutions have null singularity and we argue that it is unavoidable to have null singularity in the proposed framework, although the solutions are still physically relevant. They involve an arbitrary function F (x) which is shown to have a correspondence to the 1/2 BPS states of the BMN matrix model. A detailed map between the 1/2 BPS states of both sides is worked out.