TY  - JOUR
A1  - Pfäffle, Frank
A1  - Stephan, Christoph A.
T1  - The holst action by the spectral action principle
JF  - Communications in mathematical physics
N2  - We investigate the Holst action for closed Riemannian 4-manifolds with orthogonal connections. For connections whose torsion has zero Cartan type component we show that the Holst action can be recovered from the heat asymptotics for the natural Dirac operator acting on left-handed spinor fields.
Y1  - 2011
U6  - https://doi.org/10.1007/s00220-011-1303-0
SN  - 0010-3616
VL  - 307
IS  - 1
SP  - 261
EP  - 273
PB  - Springer
CY  - New York
ER  - 
TY  - GEN
A1  - Pfäffle, Frank
A1  - Stephan, Christoph A.
T1  - The holst action by the spectral action principle (vol 307, pg 261, 2011)
T2  - Communications in mathematical physics
Y1  - 2012
U6  - https://doi.org/10.1007/s00220-012-1507-y
SN  - 0010-3616
VL  - 313
IS  - 1
SP  - 291
EP  - 292
PB  - Springer
CY  - New York
ER  - 
TY  - INPR
A1  - Pfäffle, Frank
A1  - Stephan, Christoph A.
T1  - On gravity, torsion and the spectral action principle
N2  - We consider compact Riemannian spin manifolds without boundary equipped with orthogonal connections. We investigate the induced Dirac operators and the associated commutative spectral triples. In case of dimension four and totally anti-symmetric torsion we compute the Chamseddine-Connes spectral action, deduce the equations of motions and discuss critical points.
T3  - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)16 
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-59989
SN  - 2193-6943
ER  - 
TY  - INPR
A1  - Pfäffle, Frank
A1  - Stephan, Christoph A.
T1  - The Holst action by the spectral action principle
N2  - We investigate the Holst action for closed Riemannian 4-manifolds with orthogonal connections. For connections whose torsion has zero Cartan type component we show that the Holst action can be recovered from the heat asymptotics for the natural Dirac operator acting on left-handed spinor fields.
T3  - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)19 
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-60032
ER  - 
TY  - BOOK
A1  - Rasche, Christoph
A1  - Rehder, Stephan A.
ED  - Wagner, Dieter
ED  - Mülller, Magnus
ED  - Madani, Roya
T1  - Internationales Management
T3  - Kohlhammer executive education
Y1  - 2017
SN  - 978-3-17-033399-4
PB  - Kohlhammer
CY  - Stuttgart
ER  - 
TY  - INPR
A1  - Pfäffle, Frank
A1  - Stephan, Christoph A.
T1  - Chiral asymmetry and the spectral action
N2  - We consider orthogonal connections with arbitrary torsion on compact Riemannian manifolds. For the induced Dirac operators, twisted Dirac operators and Dirac operators of Chamseddine-Connes type we compute the spectral action. In addition to the Einstein-Hilbert action and the bosonic part of the Standard Model Lagrangian we find the Holst term from Loop Quantum Gravity, a coupling of the Holst term to the scalar curvature and a prediction for the value of the Barbero-Immirzi parameter.
T3  - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)20 
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-60046
ER  - 
TY  - JOUR
A1  - Bergholz, Andre
A1  - Heymann, Stephan
A1  - Schenk, Jörg A.
A1  - Freytag, Johann Christoph
T1  - Sequence comparison using a relational database approach
Y1  - 1997
SN  - 0-8186-8114-4
ER  - 
TY  - JOUR
A1  - Bergholz, André
A1  - Heymann, Stephan
A1  - Schenk, Jörg A.
A1  - Freytag, Johann Christoph
T1  - Biological sequences integrated: a relational database approach
N2  - Over the last decade the modeling and the storage of biological data has been a topic of wide interest for scientists dealing with biological and biomedical research. Currently most data is still stored in text files which leads to data redundancies and file chaos. In this paper we show how to use relational modeling techniques and relational database technology for modeling and storing biological sequence data, i.e. for data maintained in collections like EMBL or SWISS-PROT to better serve the needs for these application domains. For this reason we propose a two step approach. First, we model the structure (and therefore the meaning of the) data using an Entity-Relationship approach. The ER model leads to a clean design of a relational database schema for storing and retrieving the DNA and protein data extracted from various sources. Our approach provides the clean basis for building complex biological applications that are more amenable to changes and software ports than their file-base counterparts.
Y1  - 2001
UR  - http://www.springerlink.com/app/home/ contribution.asp?wasp=161c4c19086a4dceac9312b46e5f2348&referrer=parent&backto=issue,1,5;journal,14,29;linkingpublicationr esults,1:102835,1
ER  -