Tagged fluctuation theorems · show all articles
A short mechanics walkthrough of how physicists pull equilibrium numbers out of nonequilibrium noise, and what that same bookkeeping says about motors, swimmers, and networks.
From a thought-experiment demon in 1929 to a bead in an optical trap: how a century of physics learned to put a number on the cost of a single fluctuation.
Fluctuation theorems, stochastic thermodynamics, and large-deviation theory all quantify nonequilibrium behavior, but they answer different questions and demand different data — none of them is a substitute for the others.
Natural selection needs irreversibility: variation that does not un-vary, dissipation that never runs in reverse. Irreversibility is physics' own unfinished argument, and this is what it actually says.
Fluctuation theorems do not repeal the second law; they reveal the trajectory-level asymmetry from which its macroscopic certainty emerges.