  The holographic Witten-Sakai-Sugimoto model is an almost parameter-free
approximation to large-N QCD with chiral quarks that in a number of cases gives
surprisingly good quantitative results for light meson physics. It also allows
for predictions of the decay rates of glueballs into pseudoscalar and vector
mesons through the coupling of modes on the flavor branes to the massive
gravitational modes in the bulk. Including effects from finite quark masses
leads to an enhancement of the decay of scalar glueballs into heavier
pseudoscalars in good agreement with the decay pattern observed for the scalar
glueball candidate f0(1710). Tensor glueballs are found to have a large width
when their masses are above the 2 rho and 2 K* thresholds. With a mass as
suggested by lattice gauge theory the lowest tensor glueball appears to be too
broad to be observable, in contrast to the pseudoscalar glueball which may be a
rather narrow state.
