3 papers
cond-mat.stat-mech2026
Blind directions of linear response and the limits of finite-perturbation bounds on efficiency fluctuations
Badr Farih
Thermodynamic uncertainty relations bound the fluctuations of time-antisymmetric currents. Stochastic efficiency is not one: a ratio of two odd quantities, it is even under path re…
cond-mat.stat-mech2026
Optimal probing scale for current fluctuations in a Brownian gyrator
Badr Farih
A driven colloidal rotor sustains a circulating current whose fluctuations one would like to bound. Any such bound rests on how strongly the current responds to a perturbation and…
cond-mat.stat-mech2026
Sharp Bounds on the Mean Efficiency of a Fluctuating Machine
Badr Farih
The efficiency of a machine at the scale of thermal fluctuations is random, and the conventional ratio has no moment of any order: its input heat fluctuates through zero.…