English

Semiclassical Birkhoff-Gustavson normal forms and spectral asymptotics for nearly resonant Schr\"odinger operators

Spectral Theory 2024-10-16 v1 Mathematical Physics math.MP

Abstract

The concept of near resonances for harmonic approximations of semiclassical Schr\"odinger operators is introduced and explored. Combined with a natural extension of the Birkhoff-Gustavson normal form, we obtain formulas for approaching the discrete spectrum of such operators which are both accurate and easy to implement. We apply the theory to the physically important case of the near Fermi 1:2 resonance, for which we propose explicit expressions and numerical computations.

Keywords

Cite

@article{arxiv.2410.11440,
  title  = {Semiclassical Birkhoff-Gustavson normal forms and spectral asymptotics for nearly resonant Schr\"odinger operators},
  author = {Abdelkader Bourebai and Kaoutar Ghomari and San Vu Ngoc},
  journal= {arXiv preprint arXiv:2410.11440},
  year   = {2024}
}