Aging and effective temperatures near a critical point

Abstract : The orientation fluctuations of the director of a liquid crystal(LC) are measured after a quench near the Fréedericksz transition, which is a second order transition driven by an electric field. We report experimental evidence that, because of the critical slowing down, the LC presents, after the quench, several properties of an aging system, such as power law scaling versus time of correlation and response functions. During this slow relaxation, a well defined effective temperature, much larger than the heat bath temperature, can be measured using the fluctuation dissipation relation.
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Contributor : Sergio Ciliberto <>
Submitted on : Friday, March 6, 2009 - 3:50:08 PM
Last modification on : Wednesday, November 20, 2019 - 8:02:10 AM
Long-term archiving on : Thursday, September 23, 2010 - 5:07:25 PM

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  • HAL Id : ensl-00327521, version 3
  • ARXIV : 0810.1392

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Sylvain Joubaud, Baptiste Percier, Artyom Petrosyan, Sergio Ciliberto. Aging and effective temperatures near a critical point. Physical Review Letters, American Physical Society, 2009, 102 (13), pp.130601. ⟨ensl-00327521v3⟩

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