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The free energy cost of reducing noise while maintaining a high sensitivity | Pablo Sartori
; Yuhai Tu
; | Date: |
27 May 2015 | Abstract: | Living systems need to be highly responsive, and also to keep fluctuations
low. These goals are incompatible in equilibrium systems due to the Fluctuation
Dissipation Theorem (FDT). Here, we show that biological sensory systems,
driven far from equilibrium by free energy consumption, can reduce their
intrinsic fluctuations while maintaining high responsiveness. By developing a
continuum theory of the E. coli chemotaxis pathway, we demonstrate that
adaptation can be understood as a non-equilibrium phase transition controlled
by free energy dissipation, and it is characterized by a breaking of the FDT.
We show that the maximum response at short time is enhanced by free energy
dissipation. At the same time, the low frequency fluctuations and the
adaptation error decrease with the free energy dissipation algebraically and
exponentially, respectively. | Source: | arXiv, 1505.7413 | Services: | Forum | Review | PDF | Favorites |
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