| Issue |
EPL
Volume 96, Number 4, November 2011
|
|
|---|---|---|
| Article Number | 40007 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/96/40007 | |
| Published online | 08 November 2011 | |
Supersonic and subsonic shock waves in the unitary Fermi gas
Dipartimento di Fisica “Galileo Galilei” and CNISM, Università di Padova - Via Marzolo 8, 35131 Padova, Italy, EU
Received:
20
July
2011
Accepted:
29
September
2011
We investigate shock waves in the unitary Fermi gas by using the zero-temperature equations of superfluid hydrodynamics. We obtain analytical solutions for the dynamics of a localized perturbation of the uniform gas. These supersonic bright and subsonic dark solutions produce, after a transient time, an extremely large (divergent) density gradient: the shock. We calculate the time of formation of the shock and also simulate the space-time behavior of the waves by solving generalized hydrodynamic equations, which include a reliable dispersive regularization of the shock. We find that the shock spreads into wave ripples whose properties crucially depend on the chosen initial configuration.
PACS: 03.75.Ss – Degenerate Fermi gases / 47.40.Nm – Shock wave interactions and shock effects
© EPLA, 2011
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