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Derivation of Hartree-Fock Dynamics and Semiclassical Commutator Estimates for Fermions in a Magnetic Field

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arxiv 2503.16001 v1 pith:TUD5Q36W submitted 2025-03-20 math-ph math.MP

classification math-phmath.MP
keywords hartree-fockequationfieldmagneticsemiclassicaldatadynamicsestimates
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We study the quantum dynamics of a large number of interacting fermionic particles in a constant magnetic field. In a coupled mean-field and semiclassical scaling limit, we show that solutions of the many-body Schr\"odinger equation converge to solutions of a non-linear Hartree-Fock equation. The central ingredient of the proof are certain semiclassical trace norm estimates of commutators of the position and momentum operators with the one-particle density matrix of the solution of the Hartree-Fock equation. In a first step, we prove their validity for non-interacting initial data in a magnetic field by generalizing a 2020 result of Fournais and Mikkelsen. We then propagate these bounds from the initial data along the Hartree-Fock flow to arbitrary times.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Momentum Distribution of a Fermi Gas with Coulomb Interaction in the Random Phase Approximation

    math-ph 2025-11 accept novelty 6.0 of 10

    A rigorous proof shows the momentum distribution of a Fermi-gas trial state is the Fermi step plus the RPA correction, with k_F^{-2+ε} errors for summable interactions.

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  3. The quantitative semi-classical limit of a large Fermi system at zero temperature

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    For three-dimensional interacting fermions at zero temperature, the ground-state Wigner function approaches Thomas-Fermi theory in trace norm at rate N times a positive power of the semi-classical parameter, with Coul...

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