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Mesons with quantum numbers $J^{PC}=1^{-+}$ cannot be represented as simplequark-antiquark pairs. We explore hybrid configurations in the light mesonsector comprising a quark, an antiquark and an excited gluon, studying theproperties of such states in a phenomenological model inspired by thegauge/gravity correspondence. The computed mass, compared to the experimentalmass of the $1^{-+}$ candidates $\pi_1(1400)$, $\pi_1(1600)$ and $\pi_1(2015)$,favous $\pi_1(1400)$ as the lightest hybrid state. An interesting resultconcerns the stability of hybrid mesons at finite temperature: they disappearfrom the spectral function (i.e. they melt) at a lower temperature with respectto other states, light vector and scalar mesons, and scalar glueballs.

Exotic $J^{PC}=1^{-+}$ mesons in a holographic model of QCD