TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - A Characteristic decay semigroup for the resonances of trace class perturbations with analyticity conditions of semibounded hamiltonians
JF  - International journal of theoretical physic
N2  - To asymptotic complete scattering systems {M(+) + V, M(+)} on H(+) := L(2)(R(+), K, d lambda), where M(+) is the multiplication operator on H(+) and V is a trace class operator with analyticity conditions, a decay semigroup is associated such that the spectrum of the generator of this semigroup coincides with the set of all resonances (poles of the analytic continuation of the scattering matrix into the lower half plane across the positive half line), i.e. the decay semigroup yields a "time-dependent" characterization of the resonances. As a counterpart a "spectral characterization" is mentioned which is due to the "eigenvalue-like" properties of resonances.
KW  - Resonances
KW  - Scattering theory
KW  - Lax-Phillips theory
KW  - Decay semigroups
Y1  - 2011
U6  - https://doi.org/10.1007/s10773-010-0533-9
SN  - 0020-7748
VL  - 50
IS  - 7
SP  - 2002
EP  - 2008
PB  - Springer
CY  - New York
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - A modified approach to the Doplicher-Roberts theorem on the construction of field algebra and the symmetry group in superselection theory
T3  - Preprint / SFB 288, Differentialgeometrie und Quantenphysik
Y1  - 1994
VL  - 134
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - A modified approach to the Doplicher-Roberts theorem on the construction of the field algebra and the symmetry group in superselection theory
Y1  - 1997
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
A1  - Jurke, Matthias
A1  - Lledó, Fernando
T1  - A remark on covariant and causal nets of CAR-resp.CCR-type local algebras assigned to the irreducible unitary representation of the poincare group labeled by (m>0, s, +)
T3  - Preprint / SFB 288, Differentialgeometrie und Quantenphysik
Y1  - 1994
VL  - 120
CY  - Berlin
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Actions of finite abelian groups on abelian C*-algebras Z: Second cohomology and description by C*-extensions F ) Z
T3  - Preprint / SFB 288, Differentialgeometrie und Quantenphysik
Y1  - 1999
VL  - 383
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - An Application of the DR-Duality Theory for Compact Groups to Endomorphism Categories of C*-Algebras with Nontrivial Center
Y1  - 2001
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - An inverse problem for superselection structures on C*-algebras with nontrivial center
Y1  - 1999
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Betrachtungen zur kulturellen Dimension der Mathematik
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1997
VL  - 1997, 15
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Cuntz algebras and superselection structures in Quantum Field Theory
T3  - LQP Papers / Local Quantum Physics Crossroads
Y1  - 1999
UR  - http://www.lqp.uni-goettingen.de
PB  - Univ.
CY  - Göttingen
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - Dual actions on C*-algebras and Hilbert extensions
Y1  - 2000
ER  -