University of Cambridge > Talks.cam > DAMTP Statistical Physics and Soft Matter Seminar > Force correlations in disordered systems and this year’s Nobel prize in physics

Force correlations in disordered systems and this year’s Nobel prize in physics

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Camille Scalliet.

We study the force-force correlator for disordered elastic systems. We show that each of the relevant universality classes has its own function. The nicest experiments are for DNA unzipping and Barkhausen noise. For the latter we observe two distinct universality classes, depending on the range of spin interactions. In all cases force-force correlations grow linearly at small distances, while they are bounded at large distances. As a consequence, avalanches are anti-correlated, i.e. reduced in size, at short distances. Our theory is based on the functional renormalization group, which we compare to an alternative approach, namely mean-field theory with replica-symmetry breaking. The latter is one of the key achievements cited in this year’s Nobel prize for Giorgio Parisi. Another involves super mathematics, which we use to map charge-density waves to loop-erased random walks.

This talk is part of the DAMTP Statistical Physics and Soft Matter Seminar series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

 

© 2006-2022 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity