Quantum Chromodynamics, the theory of the strong force, allows
the interaction among gluons, the gauge meson of the theory, with
the same coupling as the quark-gluon interaction. This suggests the
formation of color singlet bound states of only gluons: the glueballs.
I will analyze how their properties manifest in experimental spectra
and will show that they provide a good signature for color deconfinement.
IFIC, Universidad de Valencia, Spain