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Using the gauge-gravity duality we study strongly coupled dynamics offundamental flavours in large N_c gauge theories in a constant external field.We primarily focus on the effects of an external magnetic field. We use twoholographic models realized in the Type IIB and Type IIA supergravity andpresent a comparative case study. In both these models, by studying thedynamics of probe branes, we explicitly demonstrate and discuss themagnetically induced chiral symmetry breaking effect ("magnetic catalysis") inthe flavour sector. We also study the associated thermodynamics and the mesonspectrum and realize e.g. Zeeman splitting, stability enhancement of the mesonsin the presence of an external magnetic field etc. By studying the quasinormalmodes of the probe brane fluctuation in the hydrodynamic limit we also obtainan analytic dispersion relation in the presence of a magnetic field in the TypeIIA model. This dispersion relation consists of a propagating sound mode in theotherwise diffusive channel and is sourced by the quantum anomaly of the globalU(1) current. We briefly discuss the effects of an external electric field andobserve that the flavour bound states dissociate for sufficiently high electricfields and an electric current is induced.

External Fields and the Dynamics of Fundamental Flavours in Holographic Duals of Large N Gauge Theories