# Seminars & Colloquia Calendar

## Giovanni Gallavotti - Viscosity, Reversibility, Statistical Ensembles for stationary non-equilibria

#### Giovanni Gallavotti

Location: ** Webinar**

Date & time: Wednesday, 23 September 2020 at 10:45AM - 11:45PM

------------------------

**Giovanni Gallavotti – University of Rome "La Sapienza"**

Wednesday, September 23, **10:45AM**

Title

**“Viscosity, Reversibility, Statistical Ensembles for stationary non-equilibria”**

New ideas generate misunderstandings and controversies. The theory of chaotic evolution has key implications on topics like nonequilibrium thermodynamics, ergodicity, entropy, turbulence, ensembles:

some of them will be presented to discuss novelties stemming out of Ruelle's and Bowen contributions and from the preceding work of Anosov, Sinai ... An example from the study of fluctuations in stationary states for

a simple Navier-Stokes system will be presented and centered on the question: is it possible that a viscous fluid could be described via reversible equations? A positive answer is proposed in analogy with the ensembles

equivalence in mechanics; the role of the container volume is played by a regularization parameter N for the equations, the temperature by the viscosity and the energy by the fluid enstrophy. The thermodynamic limit will correspond to the removal of the regularization (N -> infinity). An interpretation of viscosity emerges which maintains the equation reversible while retaining the physical consequences of irreversibility, interpreted as a spontaneous symmetry breakdown. And typical fluctuation properties of reversible flows arise, in some cases, in the usual viscous flow.

Chiara Damiolini, Ian Coley and Franco Rota -Charles Weibel Organizer's Page

Brooke Logan

Narek Hovsepyan and Ewerton Rocha Vieira Organizer's page

Ziming Shi, Sagun Chanillo, Xiaojun Huang, Chi Li, Jian Song Seminar website Old seminar website

Swastik Kopparty, Sepehr Assadi Seminar webpage

Jeffry Kahn, Bhargav Narayanan, Jinyoung Park Organizer's webpage

Brooke Ogrodnik, Website

Robert Dougherty-Bliss and Doron Zeilberger --> homepage

Paul Feehan, Daniel Ketover, Natasa Sesum Organizer's webpage

Lev Borisov, Emanuel Diaconescu, Angela Gibney, Nicolas Tarasca, and Chris Woodward Organizer's webpage

Hong Chen Seminar webpage

Fanxin Wu and Nkhalo Malawo

James Holland; Organizer website

Edna Jones Organizer's webpage

Brooke Ogrodnik website

Yanyan Li, Zheng-Chao Han, Jian Song, Natasa Sesum Organizer's Webpage

Organizer: Luochen Zhao

Yanyan Li, Zheng-Chao Han, Natasa Sesum, Jian Song Organizer's Page

Lisa Carbone, Yi-Zhi Huang, James Lepowsky, Siddhartha Sahi Organizer's webpage

Simon Thomas website

Kasper Larsen, Daniel Ocone and Kim Weston Organizer's page

Joel Lebowitz, Michael Kiessling

Yanyan Li, Haim Brezis Organizer's Webpage

Stephen D. Miller, John C. Miller, Alex V. Kontorovich, Alex Walker seminar website

Stephen D. Miller

Brooke Ogrodnik, Website

Organizers: Yanyan Li, Z.C. Han, Jian Song, Natasa Sesum

Yael Davidov Seminar webpage

Kristen Hendricks, Xiaochun Rong, Hongbin Sun, Chenxi Wu Organizer's page

Fioralba Cakoni Seminar webpage

Ebru Toprak, Organizer

- Show events from all categories

## Special Note to All Travelers

Directions: map and driving directions. If you need information on public transportation, you may want to check the New Jersey Transit page.

*Unfortunately, cancellations do occur from time to time. Feel free to call our department: 848-445-6969 before embarking on your journey. Thank you.*