Results 11 to 20 of about 101,189 (313)
Perturbation Theory for Quasidegenerate System in Quantum Mechanics [PDF]
Progress of Theoretical Physics, 1984 Summary: Quantum mechanical perturbation theory is formulated for a quasidegenerate system. The equation of des Cloizeaux and Brandow, which has been a basic equation for determining the usual non-Hermitian effective interaction in the degenerate perturbation theory, is generalized to the quasidegenerate case. It is proved that the generalized equation
Suzuki, Kenji, Okamoto, Ryoji
openaire +3 more sources
On the connection between perturbation theory and new semiclassical expansion in quantum mechanics
Nuclear Physics B, 2023 It is shown that for the one-dimensional anharmonic oscillator with potential V(x)=ax2+bgx3+…=1g2Vˆ(gx), as well as for the radial oscillator V(r)=1g2Vˆ(gr) and for the perturbed Coulomb problem V(r)=αr+βgr+…=gV˜(gr), the Perturbation Theory in powers of
A.V. Turbiner, E. Shuryak
doaj +2 more sources
Perturbation theory in quantum mechanics [PDF]
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1929 The theory of perturbations of electronic systems has been considered by various writers, and the method is the basis of the solution of most quantum problems. It therefore seems desirable that the theory should be placed on a firm footing, and this necessitates the discussion of the convergence of the series of perturbations, which up to the present ...
Luigi E. Picasso
openaire +2 more sources
Perturbation Theory in Quantum Mechanics
, 2009 n ...
PICASSO, LUIGI ETTORE +2 more
openaire +4 more sources
Aspects of perturbation theory in quantum mechanics: The BenderWu Mathematica ® package [PDF]
Computer Physics Communications, 2018 Bundled with the source files of this document is a folder "BenderWu_v1.0" which contains the Mathematica package files and instructions. The paper has 30 pages and 1 figure.
Tin Sulejmanpasic, Mithat Ünsal
+6 more sources
Challenges in sensemaking and reasoning in the context of degenerate perturbation theory in quantum mechanics [PDF]
Physical Review Physics Education Research[This paper is part of the Focused Collection in Investigating and Improving Quantum Education through Research.] We discuss an investigation of student sensemaking and reasoning in the context of degenerate perturbation theory (DPT) in quantum mechanics.
Christof Keebaugh +2 more
doaj +2 more sources
Gauge Explicit Quantum Mechanics and Perturbation Theory [PDF]
Australian Journal of Physics, 1997 A version of quantum and statistical mechanics, including perturbation theory, is described in which explicit electromagnetic gauge arbitrariness is maintained at every stage. Any gauge may be used for a calculation provided that the wave equation operator is gauge invariant.
Alexander Stewart
openaire +2 more sources
Perturbation theory in quantum mechanics—II [PDF]
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1929 In a previous paper the theory of perturbations was discussed for system which possess only discrete spectra. The theory is now extended to systems with both discrete and continuous spectra, and in addition a slightly more general method of perturbation is considered.
Alan Herries Wilson
openaire +2 more sources
Strong Coupling Perturbation Theory in Quantum Mechanics [PDF]
, 2003 We present a full introduction to the recent devised perturbation theory for strong coupling in quantum mechanics. In order to put the theory in a proper historical perspective, the approach devised in quantum field theory is rapidly presented, showing how it implies a kind of duality in perturbation theory, from the start.
Marco Frasca
openaire +3 more sources
Time-dependent Perturbation Theory in Quantum Mechanics [PDF]
, 1999 After revealing difficulties of the standard time-dependent perturbation theory in quantum mechanics mainly from the viewpoint of practical calculation, we propose a new quasi-canonical perturbation theory. In the new theory, the dynamics of physical observables, instead of that of coefficients of wave-function expansion, is formulated so that the ...
C. Y. Chen
openaire +3 more sources