2 papers
hep-th1997
Multicomponent WKB on arbitrary symplectic manifolds: A star product approach
C. Emmrich, H. Roemer
It is known that in the WKB approximation of multicomponent systems like Dirac equation or Born-Oppenheimer approximation, an additional phase appears apart from the Berry phase. S…
hep-th1996
Multicomponent WKB and Quantization
C. Emmrich, H. Römer
Hamiltonians whose symbols are not simply real valued, but matrix or, more generally, endomorphism valued functions appear in many places in physics, examples being the Dirac equat…