36 citations · 243 across the 29 of their papers we have counts for
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Periodic orbit theory for the Hénon-Heiles system in the continuum region
J. Kaidel, P. Winkler, M. Brack
We investigate the resonance spectrum of the Hénon-Heiles potential up to twice the barrier energy. The quantum spectrum is obtained by the method of complex coordinate rotation. W…
Analyzing shell structure from Babylonian and modern times
Lis Brack-Bernsen, Matthias Brack
We investigate ``shell structure'' from Babylonian times: periodicities and beats in computer-simulated lunar data corresponding to those observed by Babylonian scribes some 2500 y…
Periodic orbit theory including spin degrees of freedom
M. Brack, Ch. Amann, M. Pletyukhov +1
We summarize recent developments of the semiclassical description of shell effects in finite fermion systems with explicit inclusion of spin degrees of freedom, in particluar in th…
Uniform approximations for pitchfork bifurcation sequences
J. Kaidel, M. Brack
In non-integrable Hamiltonian systems with mixed phase space and discrete symmetries, sequences of pitchfork bifurcations of periodic orbits pave the way from integrability to chao…
On the canonically invariant calculation of Maslov indices
M. Pletyukhov, M. Brack
After a short review of various ways to calculate the Maslov index appearing in semiclassical Gutzwiller type trace formulae, we discuss a coordinate-independent and canonically in…