At equal R-charge chemical potentials, the holographic AdS5-Reissner-Nordström black brane has a negative R-charge diffusion coefficient below a critical μ/T, making the low-temperature phase unstable.
Counter-examples to the correlated stability conjecture
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abstract
We demonstrate explicit counter-examples to the Correlated Stability Conjecture (CSC), which claims that the horizon of a black brane is unstable precisely if that horizon has a thermodynamic instability, meaning that its matrix of susceptibilities has a negative eigenvalue. These examples involve phase transitions near the horizon. Ways to restrict or revise the CSC are suggested. One of our examples shows that N=1* gauge theory has a second order chiral symmetry breaking phase transition at a temperature well above the confinement scale.
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Instability in ${\cal N}=4$ supersymmetric Yang-Mills theory at finite density
At equal R-charge chemical potentials, the holographic AdS5-Reissner-Nordström black brane has a negative R-charge diffusion coefficient below a critical μ/T, making the low-temperature phase unstable.