  Lattice simulations currently present the only way to access nonperturbative
data in strongly coupled theories from a first principle calculation. However,
in supersymmetric theories this valuable tool is not available due to the
technical sign problem. We are going to demonstrate that in the case of
glueball spectra a good quantitative estimate for the lightest states of low
spin can be obtained by means of the holographic approach. We will review the
results of the calculation in the singlet glueball sector of the N=1
supersymmetric Klebanov-Strassler model. We come up with a prediction of the
spectrum of lightest glueballs in (large Nc) N=1 supersymmetric Yang-Mills
theory.
