A short note re-deriving the known failure of local NJL models to reach the conformal speed-of-sound limit and illustrating that a Gaussian nonlocal interaction restores c_s^2 = 1/3.
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Asymptotic behavior of the Speed of Sound in Dense Matter
A short note re-deriving the known failure of local NJL models to reach the conformal speed-of-sound limit and illustrating that a Gaussian nonlocal interaction restores c_s^2 = 1/3.