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CATEGORIES:DAMTP Statistical Physics and Soft Matter Seminar
SUMMARY:The interplay between dissipation and kinetics in 
 nonequilibrium states - Marco Baiesi (University o
 f Padova)
DTSTART;TZID=Europe/London:20231114T130000
DTEND;TZID=Europe/London:20231114T140000
UID:TALK205687AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/205687
DESCRIPTION:Entropy production\, or dissipation\, characterize
 s irreversibility and nonequilibrium states deviat
 ing slightly from equilibrium conditions. However\
 , far from equilibrium\, dynamical fluctuations al
 so depend on nondissipative\, time-symmetric aspec
 ts such as the average jumping rate or the diffusi
 vity of the system. These features\, which in the 
 years acquired names such as "traffic\," "dynamica
 l activity\," or "frenesy\," are kinetic quantitie
 s measuring the degree of agitation and are essent
 ial for developing a statistical mechanical descri
 ption of generic systems far from equilibrium. Exa
 mples show how frenetic aspects help understand th
 e nonequilibrium linear response. Writing such a r
 esponse as a difference between a dissipative and 
 a frenetic term allows for identifying homeostatic
  regimes in biological conditions\, where both ter
 ms cancel each other\, or even regimes with a nega
 tive differential response. Frenesy also constrain
 s the precision of currents (in a "kinetic uncerta
 inty relation") and even provides a lower bound to
  the entropy production in entirely irreversible c
 onditions. This lower bound empirically may be mor
 e precise in estimating dissipation than directly 
 applying the theoretical expression for the entrop
 y production in Markov jump systems.
LOCATION:Center for Mathematical Sciences\, Lecture room MR
 4
CONTACT:Sarah Loos
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