Seminario | Thermal relaxation asymmetry: from single molecules to hydrodynamic fluctuation

Seminario impartido por Aljaz Godec (Max Planck Institute for Multidisciplinary Sciences, Gottingen, Alemania).

Resumen:

According to conventional wisdom, a macroscopic system placed in an environment with a different temperature relaxes (i.e., warms up or cools down) to the temperature of the surroundings. This relaxation is mediated by the flow of heat that is set only by the temperature difference. However, when rapid changes in temperature push a system far from equilibrium, thermal relaxation becomes asymmetric, which was predicted theoretically and recently confirmed experimentally. That is, under quite general conditions, heating is in fact faster than cooling.

I will first introduce the relaxation asymmetry in reversible and detailed-balance violating finite-dimensional systems. Next I will present a rigorous formulation of thermal relaxation in the framework of hydrodynamic fluctuation theory for short- and long-range interacting systems, respectively. I will show that the asymmetry persists in the hydrodynamic limit and that in contrast to finite-dimensions a «true» close-to-equilibrium thermal quench with symmetric heating and cooling at all times does not exist.

• Fecha: miércoles 9 de abril de 2025
• Lugar: Aula A03 (ubicada en Aulario A de la Facultad de Ciencias)
• Horario: 12:10
• Organiza: Laboratorio de Nanopartículas
• Más información: nanotlab@ugr.es