TY - JOUR
T1 - Generalized energy equipartition in harmonic oscillators driven by active baths
AU - Maggi, Claudio
AU - Paoluzzi, Matteo
AU - Pellicciotta, Nicola
AU - Lepore, Alessia
AU - Angelani, Luca
AU - Di Leonardo, Roberto
N1 - Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/12/3
Y1 - 2014/12/3
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.113.238303
DO - 10.1103/PhysRevLett.113.238303
M3 - Article
AN - SCOPUS:84918589483
SN - 0031-9007
VL - 113
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 238303
ER -