Holographic Approach to Finite Temperature QCD: The Case of Scalar Glueballs and Scalar Mesons

Understand

We study scalar glueballs and scalar mesons at $T \neq 0$ in the soft wall holographic QCD model.

• We find that, using the Anti-de Sitter-Black Hole metric for all values of the temperature, the masses of the hadronic states decrease and the widths become broader when T increases, and there are temperatures for which the states disappear from the scalar glueball and scalar meson spectral functions.
• However, the values of the temperatures in correspondence of which such phenomena occur are low, of the order of 40-60 MeV.
• A consistent holographic description of in-medium effects on hadron properties should include the Hawking-Page transition, which separates the phase with the Anti-de Sitter metric at small temperatures from the phase with Anti-de Sitter-Black Hole metric at high temperatures.