Magnetic susceptibility of the quark condensate via holography

Understand

We discuss the holographic derivation of the magnetic susceptibility of the quark condensate.

• It is found that the susceptibility emerges upon the account of the Chern-Simons term in the holographic action.
• We demonstrate that Vainshtein's relation is not exact in the hard wall dual model but is fulfilled with high accuracy.
• Some comments concerning the spectral density of the Dirac operator are presented.