A local trace formula for Anosov flows (with an appendix by Fr\'ed\'eric   Naud)
  We prove a local trace formula for Anosov flows. It relates Pollicott--Ruelle resonances to the periods of closed orbits. As an application, we show that the counting function for resonances in a sufficiently wide strip cannot have a sublinear growth. In particular, for any Anosov flow there exist strips with infinitely many resonances. 
Long Jin, Fr\'ed\'eric Naud, Maciej Zworski
math.DS math.AP math.SP