[seminar] Seminar na IF-u 19. studenoga 2014. u 15:00 sati - dr. sc. I. Balog: Understanding hysteresis in the random field Ising model

[Osor Barisic]

19. studenoga 2014. (srijeda) u 15:00 sati 

Institut za fiziku, Bijenička cesta 46, predavaonica u III krilu 




dr. sc. I. Balog 
Institut za fiziku, Zagreb 




Understanding hysteresis in the random field Ising model 



The random-field Ising model (RFIM) is one of the simplest statistical-mechanical models that captures the anomalous irreversible collective response seen in a wide range of physical, biological, or socioeconomic situations in the presence of interactions and intrinsic heterogeneity or disorder. When slowly driven at zero temperature, it can display an out-of-equilibrium phase transition associated with critical scaling (“crackling noise”), while it undergoes at equilibrium, under either temperature or disorder-strength changes, a thermodynamic phase transition. We show that the out-of-equilibrium and equilibrium critical behaviors are in the same universality class: they are controlled, in the renormalization-group (RG) sense, by the same zero-temperature fixed point. We do so by combining a field-theoretical formalism that accounts for the multiple metastable states and the exact (functional) RG. As a spin-off, we also demonstrate that critical fluids in disordered porous media are in the same universality class as the RFIM, thereby unifying a broad spectrum of equilibrium and out-of-equilibrium phenomena. 



Voditelji seminara IF-a: Nikša Krstulović i Osor Barišić 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.phy.pmf.unizg.hr/pipermail/seminar/attachments/20141114/131da445/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: logo_IF_seminar.jpg
Type: image/jpeg
Size: 9859 bytes
Desc: not available
URL: <http://www.phy.pmf.unizg.hr/pipermail/seminar/attachments/20141114/131da445/attachment.jpg>