Exact symmetries in the velocity fluctuations of a hot Brownian swimmer
  Symmetries constrain dynamics. We test this fundamental physical principle, experimentally and by molecular dynamics simulations, for a hot Janus swimmer operating far from thermal equilibrium. Our results establish scalar and vectorial steady-state fluctuation theorems and a thermodynamic uncertainty relation that link the fluctuating particle current to its entropy production at an effective temperature. A Markovian minimal model elucidates the underlying non-equilbrium physics. 
Gianmaria Falasco, Richard Pfaller, Andreas P. Bregulla, Frank Cichos,   and Klaus Kroy
cond-mat.stat-mech cond-mat.soft