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SUMMARY:The interplay between dissipation and kinetics in nonequilibrium s
 tates - Marco Baiesi (University of Padova)
DTSTART:20231114T130000Z
DTEND:20231114T140000Z
UID:TALK205687@talks.cam.ac.uk
CONTACT:Sarah Loos
DESCRIPTION:Entropy production\, or dissipation\, characterizes irreversib
 ility and nonequilibrium states deviating slightly from equilibrium condit
 ions. However\, far from equilibrium\, dynamical fluctuations also depend 
 on nondissipative\, time-symmetric aspects such as the average jumping rat
 e or the diffusivity of the system. These features\, which in the years ac
 quired names such as "traffic\," "dynamical activity\," or "frenesy\," are
  kinetic quantities measuring the degree of agitation and are essential fo
 r developing a statistical mechanical description of generic systems far f
 rom equilibrium. Examples show how frenetic aspects help understand the no
 nequilibrium linear response. Writing such a response as a difference betw
 een a dissipative and a frenetic term allows for identifying homeostatic r
 egimes in biological conditions\, where both terms cancel each other\, or 
 even regimes with a negative differential response. Frenesy also constrain
 s the precision of currents (in a "kinetic uncertainty relation") and even
  provides a lower bound to the entropy production in entirely irreversible
  conditions. This lower bound empirically may be more precise in estimatin
 g dissipation than directly applying the theoretical expression for the en
 tropy production in Markov jump systems.
LOCATION:Center for Mathematical Sciences\, Lecture room MR4
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