Comment on "Consistent thermostatistics forbids negative absolute temperatures"
Ulrich Schneider, Stephan Mandt, Akos Rapp, Simon Braun, Hendrik Weimer, Immanuel Bloch, Achim Rosch
Abstract
In this comment we argue that negative absolute temperatures are a well-established concept for systems with bounded spectra. They are not only consistent with thermodynamics, but are even unavoidable for a consistent description of the thermal equilibrium of inverted populations.