title: Generalized energy equipartition in harmonic oscillators driven by active baths.
abstract: 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.
authors.affiliation: Dipartimento di Fisica, Università di Roma "Sapienza," I-00185 Roma, Italy.
authors.forename: Claudio
authors.initials: C
authors.lastname: Maggi
authors.affiliation: CNR-IPCF, UOS Roma, Dipartimento di Fisica Università Sapienza, I-00185 Roma, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Paoluzzi
authors.affiliation: Dipartimento di Fisica, Università di Roma "Sapienza," I-00185 Roma, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Pellicciotta
authors.affiliation: Dipartimento di Fisica, Università di Roma "Sapienza," I-00185 Roma, Italy.
authors.forename: Alessia
authors.initials: A
authors.lastname: Lepore
authors.affiliation: CNR-IPCF, UOS Roma, Dipartimento di Fisica Università Sapienza, I-00185 Roma, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Angelani
authors.affiliation: Dipartimento di Fisica, Università di Roma "Sapienza," I-00185 Roma, Italy and CNR-IPCF, UOS Roma, Dipartimento di Fisica Università Sapienza, I-00185 Roma, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Di Leonardo