3 papers
math.NA2025
Fourth-order compact exponential splittings for unbounded operators
Juan Carlos Del Valle, Arieh Iserles, Karolina Kropielnicka
We present a derivation and error bound for the family of fourth order splittings, originally introduced by Chin and Chen, where one of the operators is unbounded and the second on…
physics.atom-ph2024
R-matrix with time-dependence calculations for three-sideband RABBITT in helium
A. T. Bondy, J. C. del Valle, S. Saha +4
Following up on a recent paper [Bharti et al., Phys. Rev. A 109 (2024) 023110], we compare the predictions from severalR-matrix with time-dependence calculations for a modified thr…
quant-ph2021
From quartic anharmonic oscillator to double well potential
Alexander V. Turbiner, J. C. del Valle
It is already known that the quantum quartic single-well anharmonic oscillator and double-well anharmonic oscillator are essentia…