Abstract
The orientation fluctuations of the director of a liquid crystal are measured, using asensitive polarization interferometer, close to the Fréedericksz transition, which is asecond-order transition driven by an electric field. Using mean field theory, wedefine the work injected into the system by a change of the electric field and wecalibrate it using the fluctuation-dissipation theorem. We show that the workfluctuations satisfy the transient fluctuation theorem. An analytical justification ofthis result is given. The open problems for the out-of-equilibrium case are thendiscussed.
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