Generalized energy equipartition in harmonic oscillators driven by active baths.

We study experimentally and numerically the dynamics of colloidal beads confined by a harmonic potential in a bath of swimming E. coli bacteria. The resulting dynamics is well approximated by a Langevin equation for an overdamped oscillator driven by the combination of a white thermal noise and an exponentially correlated active noise. This scenario leads to a simple generalization of the equipartition theorem resulting in the coexistence of two different effective temperatures that govern dynamics along the flat and the curved directions in the potential landscape.

• Publication year

  2014

• Venue

  Physical Review Letters

• Publication date

  2014-09-13

• Fields of study

  Medicine, Physics

• Identifiers
  DOI 10.1103/PhysRevLett.113.238303arXiv 1409.3929PMID 25526168
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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