Probing active forces via a fluctuation-dissipation relation

Details Probing active forces via a fluctuation-dissipation relation Probing active forces via a fluctuation-dissipation relation

2012-03-15

arxiv.org/abs/1203.3571v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We derive a new fluctuation-dissipation relation for non-equilibrium systems with long term memory. We show how this relation allows one to access new experimental information regarding active forces in living cells that cannot otherwise be accessed. For a silica bead attached to the wall of a living cell, we identify a cross-over time between thermally controlled fluctuations and those produced by the active forces. We show that the probe position is eventually slaved to the underlying random drive produced by the so-called active forces.

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