| dc.description.abstract | A holographic model of a QCD-like theory in a magnetic background is
studied in the limit of an infinite number of colors Nc and infinite massless
quark flavors Nf, where the ratio x = Nf/Nc is kept constant at 1. The
gravitational model contains two scalar bulk fields, namely a dilaton λ,
which is the source of tr F^2 , with F the gluon field tensor, and a tachyon
sourcing the chiral condensate <q̄q>. This model is used to compute both
the chiral and the deconfinement phase transition temperatures, as well as
the chiral condensate. This leads to a computation of the phase diagram
of QCD in the (T, B)-plane, as well as the observation of inverse magnetic
catalysis of the chiral condensate by the magnetic field, in qualitative
agreement with lattice results. | |
