Status  Confirmed 
Seminar Series  IPHTMAT 
Subjects  hepth 
Date  Wednesday 15 November 2017 
Time  14:15 
Institute  IPHT 
Seminar Room  Salle Claude Itzykson, Bât. 774 
Speaker's Last Name  Sebastian GarciaSaenz 
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Speaker's Institution  Institut d'Astrophysique de Paris 
Title  Phonons in holographic superfluids and solids 
Abstract  After reviewing the gravitational dual of superfluids in the context of AdS/CFT, I will describe an analytical method to derive the lowenergy spectrum of the boundary theory. The result confirms that, at zero temperature, the effective theory consists of a longitudinal phonon with the correct speed of sound. I will next move on to consider the EFT of solids and use it to motivate the construction of a holographic dual. Here too we are able to derive the correct lowenergy effective theory of the phonons in a conformally invariant solid. Lastly we obtain some numerical solutions including backreaction and calculate the free energy, finding evidence that the system ``melts'' into a black hole as the temperature is raised, which we interpret as a solidtoliquid phase transition on the field theory side. 
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