Laboratoire de Physique et Chimie des Nano-objets

Institut National des Sciences Appliquées
135 avenue de Rangueil, 31077 TOULOUSE CEDEX 4 - FRANCE
Tél : 00 33 05 61 55 96 45 | Fax : (+33) (0)5 61 55 96 97

Partenaires

CNRS
INSA


Choose your site's language


          Version Française           English Version

Search

On this website



Home page > LPCNO > Seminars > 2019 > The mathematics of charged liquid drops

The mathematics of charged liquid drops

Date : 04/07/2019 à 14:00

Titre : The mathematics of charged liquid drops

Intervenant : Cyrill Muratov

Provenance : New Jersey Institute of Technology, USA.

Salle : salle GEI 13 - génie électrique et informatique

Abstract : In this talk, I will present an overview of recent analytical developments in the studies of equilibrium configurations of liquid drops in the presence of repulsive Coulombic forces. Due to the fundamental nature of Coulombic interaction, these problems arise in systems of very different physical nature and on vastly different scales: from femtometer scale of a single atomic nucleus to micrometer scale of droplets in electrosprays to kilometer scale of neutron stars. Mathematically, these problems all share a common feature that the equilibrium shape of a charged drop is determined by an interplay of the cohesive action of surface tension and the repulsive effect of long-range forces that favor drop fragmentation. More generally, these problems present a prime example of problems of energy driven pattern formation via a competition of long-range attraction and long-range repulsion. In the talk, I will focus on two classical models - Gamow’s liquid drop model of an atomic nucleus and Rayleigh’s model of perfectly conducting liquid drops. Surprisingly, despite a very similar physical background these two models exhibit drastically different mathematical properties. I will discuss the basic questions of existence vs. non-existence, as well as some qualitative properties of global energy minimizers in these models, and present the current state of the art for this class of geometric problems of calculus of variations.