Holographic entanglement entropy vs backreaction

The degree of entanglement among two systems can be quantified by the entanglement entropy, which plays a role in many areas of physics. Its calculation in QFT, however, is challenging. If available, a holographic description in terms of AdS/CFT simplifies this considerably, and thus provides the tool of choice. Many interesting AdS/CFT dualities are realized as small deformations of simpler cases, with the addition of probe branes to describe CFTs with flavor as a prominent example. We discuss new tools to efficiently compute the entanglement entropy in that setting and apply them to the D3/D7 system.