TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Über Superauswahlstrukturen und deren Eichgruppen
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1997
VL  - 1997, 06
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
A1  - Jurke, Matthias
A1  - Lledó, Fernando
T1  - Twisted duality for the CAR-algebra
Y1  - 2002
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
A1  - Jurke, Matthias
A1  - Lledó, Fernando
T1  - Twisted duality for the CAR-algebra
T3  - Preprint / SFB 288, Differentialgeometrie und Quantenphysik
Y1  - 1999
UR  - http://www-sfb288.math.tu-berlin.de/Publications/Preprints.html
VL  - 401
PB  - Techn. Univ.
CY  - Berlin
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
A1  - Jurke, Matthias
A1  - Lledó, Fernando
T1  - Symmetrie und Quantentheorie
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1995
VL  - 1995, 6
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
A1  - Lledó, Fernando
T1  - Superselection structures for C*-algebras with nontrivial center
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
A1  - Lledó, Fernando
T1  - Some results on superselection structures for C*-algebras with nontrivial center
Y1  - 1997
SN  - 981-02-3984-X
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Some operatoralgebraic fundamentals of the algebraic quantum field theory
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1993
VL  - 1993, 09
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Operatoralgebren und Quantenfeldtheorie
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1993
VL  - 1993, 12
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
T1  - Operatoralgebraic methods in quantum field theory : a series of lectures
Y1  - 1995
PB  - Akademie Verl.
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - On Haag dual nets over compact spaces
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
A1  - Jurke, Matthias
A1  - Lledó, Fernando
T1  - On free nets over Minkowski space
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - On a theorem of Ashtekar and Lewandowski in the mathematical framework of canonical quantization in quantum gravity
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - On a theorem of Ashtekar and Lewandowski
Y1  - 1999
SN  - 981-023627-1
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - On a critical radiation density in the Friedmann equation
JF  - Journal of mathematical physics
N2  - The paper presents a classification of the basic types of admissible solutions of the general Friedmann equation with non-vanishing cosmological constant and for the case that radiation and matter do not couple. There are four distinct types. The classification uses first the discriminant of a polynomial of the third degree, closely related to the right hand side of the Friedmann equation. The decisive term is then a critical radiation density which can be calculated explicitly.
Y1  - 2012
U6  - https://doi.org/10.1063/1.4771668
SN  - 0022-2488
VL  - 53
IS  - 12
PB  - American Institute of Physics
CY  - Melville
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
A1  - Jurke, Matthias
A1  - Lledó, Fernando
T1  - Mathematische Strukturen passen auf die Natur : Reflexionen über das Wechselverhältnis von Mathematik und Physik
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1994
VL  - 1994, 18
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - Lax-phillips evolutions in quantum mechanics and two-space scattering
Y1  - 2004
SN  - 0034-4877
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - Lax-phillips evolutions in quantum mechanics and two-space scattering
Y1  - 2004
SN  - 0034-4877
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
T1  - Laudatio Hans Kaiser
Y1  - 1993
ER  - 
TY  - JOUR
A1  - Baumgärtel, Hellmut
A1  - Carey, A.
T1  - Hilbert systems for actions of the circle group
Y1  - 2001
ER  - 
TY  - BOOK
A1  - Baumgärtel, Hellmut
A1  - Carey, A.
T1  - Hilbert systems for actions of the circle group
T3  - ESI-Preprint / Erwin-Schröder-Institut für Mathematische Physik, Wien
Y1  - 2000
VL  - 940, 2000
PB  - Erwin-Schröder-Institut für Mathematische Physik
CY  - Wien
ER  -