2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/21373Heat fluctuations are studied in a dissipative system with both mechanical and stochastic components for a simple model: a Brownian particle dragged through water by a moving potential. An extended stationary state fluctuation theorem is derived. For infinite time, this reduces to the conventional fluctuation theorem only for small fluctuations; for large fluctuations, it gives a much larger ratio of the probabilities of the particle to absorb rather than supply heat. This persists for finite times and should be observable in experiments similar to a recent one of Wang et al.12 pages, 1 eps figure in color (though intelligible in black and white)Statistical MechanicsMathematical PhysicsChaotic Dynamicstext