Quantum Shock Waves Hydrodynamic Singularities in Degenerate 1D quantum systems P. Wiegmann Together with Alexander Abanov
How does a wave packet propagate in degenerate Fermi gas? degenerate Bose gas?
Free fermions in 1D A smooth bump in density or momenta: all gradients << Fermi scale
A single particle: Wave packet consisting of a single particle diffuses
Does quantum coherence (or Fermi sea) make an impact?
Can this question be answered by elementary means? Free Fermions
Hydrodynamics of quantum coherent systems (traditionally called bosonization): String theory Methods: Integrable hierarchies /matrix models
Hydrodynamics: to express particles (fermions or bosons) through hydrodynamics (bosonic) modes: Bose Field
Initial (coherent) state Evolving state Matrix element
Integrability - Free Fermions Tau-function of KP-hierarchy Miwa, Jimbo, Date Virasoro currents ;
Currents of -algebra KP-hierarchy Benjamin-Ono hierarchy
bosonization - linear hydrodynamics: Linearisation of the spectrum: Shape does not change!?
Dispersion - asymmetry between particles and holes
Benjamin-Ono-equation Free Fermions =
Quantum degenerate (or coherent) systems obey dispersive non-dissipative hydrodynamics
dispersive non-dissipative hydrodynamics KdV - equation Non-periodic, non-soliton solution
Hopf equation Wave equation- a linearized version
Shock-wave solution
Burgers Semiclassics: single particle: quantum mechanics
Burgers Hopf -Riemann Benjamin-Ono Fermi-sea: quantum field theory
Witham Modulation
Witham modulation Periodic solution Modulation Shock wave
True, non-linearized hydrodynamics Hamiltonian Jevicki, Sakita, Polchinsky, Free fermions: = Non-linear bosons
Equations: Euler’s Hydrodynamics
Density Current, velocity
Schottky double
Hopf Equation:
Benjamin-Ono equation for matrix element Quantum Hopf equation for operators
Distribution of solitons is sensitive to initial data
Arena for observation: cooled alkali atomic gases
Chain of rolling cloudsMorning glory South AustraliaBelieved to be Benjamin-Ono eq
Morning Glory