Holographic phase transitions at finite baryon density

Details Holographic phase transitions at finite baryon density Holographic phase transitions at finite baryon density

2006-11-08

arxiv.org/abs/hep-th/0611099v2

JHEP 0702:016,2007

Physics

High Energy Physics

High Energy Physics - Theory

33 pages, 22 figures

Scientific paper

10.1088/1126-6708/2007/02/016

We use holographic techniques to study SU(Nc) super Yang-Mills theory coupled to Nf << Nc flavours of fundamental matter at finite temperature and baryon density. We focus on four dimensions, for which the dual description consists of Nf D7-branes in the background of Nc black D3-branes, but our results apply in other dimensions as well. A non-zero chemical potential mu or baryon number density n is introduced via a nonvanishing worldvolume gauge field on the D7-branes. Ref. [1] identified a first order phase transition at zero density associated with `melting' of the mesons. This extends to a line of phase transitions for small n, which terminates at a critical point at finite n. Investigation of the D7-branes' thermodynamics reveals that (d mu / dn)_T <0 in a small region of the phase diagram, indicating an instability. We comment on a possible new phase which may appear in this region.

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