Dear All,
Professor Eli Barkai, from the Bar-Ilan University in Israel, is at MIT
to present a theoretical chemistry seminar TODAY (Wednesday, December 2)
from 4:00-6:00pm in ROOM 56-154.
The new location is 56-154, and a map of its location is here
http://whereis.mit.edu/?selection=56&zoom=17
Please note the room change. We'll do our best to have seminars in this
room in the future.
The title of his talk will be "Weak Ergodicity Breaking." Further
information, including an abstract for the talk, can be found at
http://people.bu.edu/theochem/.
-- ABSTRACT --
In nature the noisy signal representing a Physical observable is in many
cases unpredictable, though the long time average of the signal
converges in statistical sense to the ensemble average (ergodicity).
Recently, observations of dynamics of single molecules, e.g. blinking
quantum dots [1], and motion of single mRNA in the cell revealed
non-ergodic processes [3]. These signals are characterizes by power law
sojourn times, in micro states of the system (e.g. in state on and off
for the dots) in such a way that the average time spent in a micro state
diverges (scale free dynamics).
Two basic questions addressed in my talk are (i) what theory replaced
ergodic Boltzmann-Gibbs statistical mechanics for such systems [2] (ii)
what are possible Physical mechanisms responsible for anomalous non
Gaussian dynamics.
1. F. D. Stefani, J. P. Hoogenboom, and E. Barkai. Beyond Quantum Jumps:
Blinking Nano-scale Light Emitters. Physics Today 62(2), 34 (February
2009).
2. A. Rebenshtok, E. Barkai. Weakly non-Ergodic Statistical Physics.
Journal of Statistical Physics 133, 565 (2008).
3. Y. He, S. Burov, R. Metzler, E. Barkai. Random Time-Scale Invariant
Diffusion and Transport Coefficients. Physical Review Letters 101,
058101 (2008).
See viewpoint in Igor M. Sokolov, Physics 1, 8 (2008).
Thanks!
Lee-Ping
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