Conferencia: Blast and splash in a cold gas

• Ponente: Prof. Pavel Krapivsky, Department of Physics, Boston University & Santa Fe Institute (USA).
  • https://scholar.google.com/citations?user=IBiCgqcAAAAJ&hl=es
  • https://www.santafe.edu/people/profile/paul-krapivsky
• Fecha: Jueves 13 de Febrero de 2025
• Hora: 11:00 horas
  Lugar: Laboratorio de Física Computacional. Planta Baja de Física. Facultad de Ciencias.

Resumen: We study the response of a cold gas (all particles are initially at rest) to a sudden kick when one particle suddenly starts moving. The outcome is a spherical shock wave advancing as $t^\frac{2}{d+2}$. The density, velocity, and temperature behind the shock are described by Euler equations. Deviations from the predictions of non-dissipative hydrodynamics arise in the central region whose size increases slower than the radius $R$ of the shock wave, viz. as $R^{4/5}$ in 2D and $R^{31/35}$ n 3D. In a one-dimensional semi-infinite setting, when the left-most particle suddenly starts moving to the right, a growing number of «splatter» particles penetrate the initially empty half-line. The total energy and momentum of the splatter particles exhibit counterintuitive behaviors.

Organiza: Departamento de Electromagnetismo y Física de la Materia, e Instituto Carlos I de Física Teórica y Computacional (UGR)