Equilibrium states of interval maps for hyperbolic potentials
  We study the thermodynamic formalism of sufficiently regular interval maps for Holder continuous potentials. We show that for a hyperbolic potential there is a unique equilibrium state, and that this measure is exponentially mixing. Moreover, we show the absence of phase transitions: The pressure function is real analytic at such a potential. 
Huaibin Li, and Juan Rivera-Letelier
math.DS