Predicting nonequilibrium Green’s function dynamics and photoemission spectra via nonlinear integral operator learning by Yuanran Zhu, Jia Yin, Cian C Reeves, Chao Yang, Vojtěch Vlček

Get full text

Amortissement des phonons dans un superfluide 2D : insuffisance de la règle d’or de Fermi à basse température by Castin, Yvan, Serafin, Alan, Sinatra, Alice

“…Thus, in this limit, we should always be able to calculate the damping rate of thermal phonons by applying Fermi’s golden rule to the Hamiltonian H3 of cubic phonon-phonon coupling taken from quantum hydrodynamics, at least in the case of a convex acoustic branch and in the collisionless regime (where the eigenfrequency of the considered phonons remains much greater than the gas thermalization rate). Using the many-body Green’s function method, we predict that, unexpectedly, this is not true in two dimensions, contrary to the three-dimensional case. …”
Get full text

Compactness of quantics tensor train representations of local imaginary-time propagators by Haruto Takahashi, Rihito Sakurai, Hiroshi Shinaoka

“…Space-time dependence of imaginary-time propagators, vital for ab initio and many-body calculations based on quantum field theories, has been revealed to be compressible using Quantum Tensor Trains (QTTs) [Phys. …”
Get full text