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Phonon number relaxation in a 3D superfluid with a concave acoustic branch
Yvan Castin, Mariia Tsimokha
We consider the collisional evolution towards equilibrium of a spatially homogeneous and isotropic phonon gas of a three-dimensional superfluid with a concave acoustic excitation b…
Pair distribution functions of a superfluid spin-1/2 Fermi gas with contact interactions in the linearized time-dependent BCS theory
Yvan Castin
We show that the minimal mean-field theory to use for calculating the pair distribution functions of a spatially homogeneous, unpolarized spin-1/2 sup…
Open questions for strongly interacting Fermi gases with zero-range interactions
Yvan Castin
We review some unresolved theoretical issues in three-dimensional two-component Fermi gases, drawing on recent experiments on cold atoms in immaterial traps close to a magnetic Fes…
Comment on "Excitation Spectrum and Superfluid Gap of an Ultracold Fermi Gas"
Yvan Castin
We present simple arguments suggesting that H. Biss et al [PRL 128, 100401 (2022)] did not measure with the required accuracy the low-wavenumber curvature of the acoustic excitatio…
Unitary boson-boson and boson-fermion mixtures: third virial coefficient and three-body parameter on a narrow Feshbach resonance
Shimpei Endo, Yvan Castin
We give exact integral expressions of the third cluster or virial coefficients of binary mixtures of ideal Bose or Fermi gases, with interspecies interactions of zero range and inf…
Limit of Spin Squeezing in Finite Temperature Bose-Einstein Condensates
Alice Sinatra, Emilia Witkowska, Jean-Christophe Dornstetter +2
We show that, at finite temperature, the maximum spin squeezing achievable using interactions in Bose-Einstein condensates has a finite limit when the atom number at…