TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Schwarzschild and Synge once again
N2  - We complete the historical overview about the geometry of a Schwarzschild black hole at its horizon by emphasizing the contribution made by Synge in [6] to its clarification
Y1  - 2005
UR  - http://arXiv.org/abs/gr-qc/0408017
SN  - 0001-7701
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Untitled
Y1  - 2005
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - The square of the Weyl tensor can be negative
N2  - We show that the square of the Weyl tensor can be negative by giving an example
Y1  - 2003
UR  - http://arXiv.org/abs/gr-qc/0302078
ER  - 
TY  - JOUR
A1  - Canfora, Fabrizio
A1  - Schmidt, Hans-Jürgen
T1  - Vacuum solutions which cannot be written in diagonal form
N2  - A vacuum solution of the Einstein gravitational field equation is shown to follow from a general ansatz but fails to follow from it if the symmetric matrix in it is assumed to be in diagonal form.
Y1  - 2003
UR  - http://arXiv.org/abs/gr-qc/0305107
ER  - 
TY  - JOUR
A1  - Kleinert, Hagen
A1  - Schmidt, Hans-Jürgen
T1  - Cosmology with curvature-saturated gravitational lagrangian
N2  - We argue that the Lagrangian L(R) for gravity should remain bounded at large curvature, and interpolate between the weak-field tested Einstein-Hilbert Lagrangian and a pure cosmological constant for large R with the curvature- saturated ansatz. The curvature-dependent effective gravitational constant tends to infinity for large R, in contrast to most other approaches where it tends to 0. The theory possesses neither ghosts nor tachyons, but it fails to be linearization stable. On the technical side we show that two different conformal transformations make L asymptotically equivalent to the Gurovich-ansatz on the one hand, and to Einstein's theory with a minimally coupled scalar field with self-interaction on the other.
Y1  - 2002
UR  - http://arXiv.org/abs/gr-qc/0006074
ER  - 
TY  - JOUR
A1  - Dzhunushaliev, Vladimir
A1  - Rurenko, O.
A1  - Schmidt, Hans-Jürgen
T1  - Spherically symmetric solutions in multidimensional gravity with the SU(2) gauge group as the extra dimensions
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Gorbatenko, M. V.
A1  - Pushkin, A. V.
A1  - Schmidt, Hans-Jürgen
T1  - On a relation between the Bach equation and the equation of geometrodynamics
N2  - The Bach equation and the equation of geometrodynamics are based on two quite different physical motivations, but in both approaches, the conformal properties of gravitation plays the key role. In this paper we present an analysis of the relation between these two equations and show that the solutions of the equation of geometrodynamics are of a more general nature. We show the following non-trivial result: there exists a conformally invariant Lagrangian, whose field equation generalizes the Bach equation and has as solutions those Ricci tensors which are solutions to the equation of geometrodynamics.
Y1  - 2002
ER  - 
TY  - JOUR
A1  - Gurovich, Viktor
A1  - Schmidt, Hans-Jürgen
A1  - Tokareva, Ira
T1  - Tunneling of the closed Friedmann Universe with generation of scalar waves
N2  - The evolution of the closed Friedmann Universe with a packet of short scalar waves is considered with the help of the Wheeler-DeWitt equation. The packet ensures conservation of homogeneity and isotropy of the metric on average. It is shown that during tunneling the amplitudes of short waves of a scalar field can increase catastrophically promptly if their influence to the metric is not taken into account. This effect is similar to the Rubakov-effect of catastrophic particle creation calculated already in 1984. In our approach to the problem it is possible to consider a self- consistent dynamics of the expansion of the Universe and amplification of short waves. It results in a decrease of the barrier and interruption of amplification of waves, and we get an exit of the wave function from the quantum to the classically available region.
Y1  - 2001
ER  - 
TY  - BOOK
A1  - Hooft, Gerard
A1  - Holstein, Barry
A1  - Makri, Nancy
A1  - Duru, Ismail
A1  - Ruffini, Remo
A1  - Janke, Wolfhard
A1  - Pelster, Axel
A1  - Schmidt, Hans-Jürgen
A1  - Bachmann, Michael
T1  - Fluctuating paths and fields : festschrift dedicated to Hagen Kleinert on the occasion of his 60the birthday
Y1  - 2001
SN  - 981-02-4648-X
PB  - World Scientific
CY  - River Edge, NJ
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Eichfeldtheorie
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Bachmann, Michael
A1  - Schmidt, Hans-Jürgen
T1  - Period-doubling bifurcation in strongly anisotropic Bianchi I quantum cosmology
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Capozziello, Salvatore
A1  - Lambiase, G.
A1  - Schmidt, Hans-Jürgen
T1  - Nonminimal derivative couplings and inflation in generalized theories of gravity
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Dzhunushaliev, Vladimir
A1  - Schmidt, Hans-Jürgen
T1  - New vacuum solutions of conformal Weyl gravity
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Dzhunushaliev, Vladimir
A1  - Schmidt, Hans-Jürgen
T1  - Wormholes and Flux Tubes in the 7D Gravity on the Principal Bundle with SU(2) Gauge Group as the Extra Dimensions
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Dzhunushaliev, Vladimir
A1  - Schmidt, Hans-Jürgen
T1  - Flux Tubes in Weyl Gravity
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Editor's note to A. Sakharov
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - On a new conformal duality of spherically symmetric space-times
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Topologische Aspekte in der Kosmologie
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Allgemeine Relativitätstheorie
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - On a new conformal duality of spherically symmetric space-times
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Dzhunushaliev, Vladimir
A1  - Schmidt, Hans-Jürgen
T1  - 2+2-decomposable solutions of weyl gravity
BT  - Zwei plus zwei-decomposable solutions of wey gravity
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Bachmann, Michael
A1  - Schmidt, Hans-Jürgen
T1  - Period-doubling bifurcation in strongly anisotropic Bianchi I quantum cosmology
JF  - General relativity and quantum cosmology : preprints gr-qc
Y1  - 1999
VL  - 9912068
ER  - 
TY  - JOUR
A1  - Dzhunushaliev, Vladimir
A1  - Schmidt, Hans-Jürgen
T1  - 4D wormhole with signature change in the presence of extra dimensions
BT  - VierD wormhole with signature change in the presence of extra dimensions
JF  - General relativity and quantum cosmology : preprints gr-qc
Y1  - 1999
UR  - http://xxx.soton.ac.uk/form/gr-qc?
VL  - 9908076
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Cercignani, C., Scaling limits and models in physical process; Basel, Birkhäuser, 1998
BT  - Scaling limits and models in physical process
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Editorïs note
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - The classical solutions of two-dimensional gravity
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Exact cosmological solutions of nonlinear F(R)-gravity
JF  - General relativity and quantum cosmology : preprints gr-qc
Y1  - 1998
UR  - http://xxx.soton.ac.uk/form/gr-qc?
VL  - 9808060
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
ED  - Rainer, Martin
T1  - Current topics in mathematical cosmology : proceedings of the International Seminar ; Potsdam, Germany 30 March 4 April 1998
Y1  - 1998
SN  - 981-023627-1
PB  - World Scientific
CY  - Singapore [u.a.]
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Exact cosmological solutions of nonlinear F(R)-gravity
Y1  - 1998
SN  - 981-023627-1
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Gravitation in 1+1 Dimensionen : exacte Lösungen, Konformrelationen und Beziehungen zum 3+1 -dimensionalen Fall
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - A two-dimensional representation of four-dimensional graviational waves
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Consequences of the noncompactness of the Lorentz group
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Karsinski, A., Inhomogeneous cosmological models; Cambridge, Univ. Press, 1997
BT  - Inhomogeneous cosmological models
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - 2-dimensional representations of 4-dimensional gravitational waves
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - A new duality transformation for fouth-order gravity
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Memorial notice to J. Huang
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Klassiker der Kosmologie
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - A new proof of Birkhoffïs theorem
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Conformal relations and Hamiltonian formlation of fourth-order gravity
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Pictorial examples that distinguish covariant and contravariant vectors
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Meister, Claudia-Veronika
A1  - Schmidt, Hans-Jürgen
T1  - Jahresberichte 1996
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Janyska, Josef [u.a.](Ed.) Differential geometry and applications : proceedings of the 6th international conference Brno, August 28 - September 1, 1995; Brno, Masaryk Univ., 1996
BT  - Differential geometry and applications : proceedings of the 6th international conference Brno, August 28 - September 1, 1995
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - New steps towards a proof of the cosmological "no hair" theorem
Y1  - 1997
SN  - 981-023499-6
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - New conformal relations in fourth-order gravity
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Classical mechanics with lapse
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Editorial
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - How should we measure spatial distances?
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Why do all the curvature invariants of a gravitational wave vanish?
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Kluske, Sabine
A1  - Schmidt, Hans-Jürgen
T1  - Towards a cosmic no hair theorem for higher-order gravity
Y1  - 1996
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - An alternate Hamiltonian formulation of fourth-order theories
Y1  - 1995
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Comment on conformal transformations single out a unique measure of distance
Y1  - 1995
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - How to measure spatial distances?
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1995
VL  - 1995, 10
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Kasper, Uwe
A1  - Kluske, Sabine
A1  - Rainer, Martin
A1  - Reuter, Stefan
T1  - Stability properties of the Starobinsky cosmological model
Y1  - 1995
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
A1  - Mignemi, Salvatore
T1  - Two-dimensional higher-derivative gravity and conformal transformations
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Kasper, Uwe
T1  - Differentialgeometrische Grundlagen der Kosmologie
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Editorial
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Gedenkkolloquien anläßlich des 100. Todestages von Hermann von Helmholtz, Kolloquium an der Universität Potsdam
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Rainer, Martin
T1  - Inhomogeneous cosmological models with homogeneous inner hypersurface geometry
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Kurzautobiographie
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Rainer, Martin
T1  - The natural classification of real lie algebras
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - On space-times which cannot be distinguished by curvature invariants
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - On the space of 3-dimensional homogeneous Riemannian manifolds
Y1  - 1995
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
A1  - Kluske, Sabine
T1  - Towards a no hair theorem for higher order gravit
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Mignemi, Salvatore
T1  - Two-dimensional higher-derivative gravity and conformal transformations
Y1  - 1995
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Consequences of the noncompactness of the Lorentz group
Y1  - 1995
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
A1  - Mohazzab, Masoud
A1  - Rainer, Martin
T1  - Deformations between Bianchi geometries in classical and quantum cosmology
T3  - Report IPM
Y1  - 1995
VL  - 1995, 91
PB  - IPM
CY  - Teheran
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Consequences of the noncompactness of the Lorentz group
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1995
VL  - 1995, 09
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Why do all the curvature invariants of a gravitational wave vanish?
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1994
VL  - 1994, 03
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Stability and Hamiltonian formulation of higher derivative theories
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1994
VL  - 1994, 04
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Reuter, Stefan
A1  - Schmidt, Hans-Jürgen
T1  - Klassisch konformäquivalente Gravitationstheorien und deren korrespondierende Wheeler-de-Witt-Gleichungen
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1994
VL  - 1994, 05
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Baier, Frank W.
A1  - Bleyer, Ulrich
A1  - Hubrig, Swetlana
A1  - Meister, Claudia-Veronika
A1  - Schilbach, Elena
A1  - Tiersch, Heinz
T1  - Zum Wissenschaftler-Integrationsprogramm
Y1  - 1994
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - An alternate Hamiltonian formulation of fourth-order theories
T3  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1994
VL  - 1994, 12
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Physikalische Konsequenzen von Gravitationsfeldgleichungen vierter Ordnung bei der Beschreibung des frühen Universums und isolierter Gravitationsfelder
Y1  - 1994
PB  - Tectum
CY  - Marburg
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Aufgaben zur Kosmologie
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Comment on stability of the semiclassical Einstein equation
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Jahresbericht 1993
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
A1  - Reuter, Stefan
T1  - Klassisch konformäquivalente Gravitationstheorien und deren korrespondierende Wheeler-de Witt-Gleichungen
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Personengenau und sehr prononciert : Leserbrief
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - Stability and Hamiltonian formulation of higher derivative theories
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schmidt, Hans-Jürgen
T1  - WIP-Projekt "Kosmologie"
Y1  - 1994
ER  - 
TY  - BOOK
A1  - Battaglia Mayer, Alexandra
A1  - Schmidt, Hans-Jürgen
T1  - The de Sitter space-time as attractor solution in eighth order gravity
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1993
VL  - 1993, 05
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Comment to a paper by J. Simon in Phys. Rev. D 45 (1992) 1953
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1993
VL  - 1993, 06
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
A1  - Wang, Anzhong
T1  - Plane domain walls when coupled with the Brans-Dicke scalar field
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 06
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - On inflation within closed Fiedmann universe models
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 02
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Scale-invariant gravity in two dimensions II
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 03
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Amendola, Luca
A1  - Battaglia Mayer, Alexandra
A1  - Capozziello, Salvatore
A1  - Gottlöber, Stefan
A1  - Müller, Volker
A1  - Occhionero, Franco
A1  - Schmidt, Hans-Jürgen
T1  - Generalized sixth-order gravity and inflation
JF  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 04
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Gottlöber, Stefan
A1  - Schmidt, Hans-Jürgen
A1  - Starobinsky, A. A.
A1  - Müller, Volker
T1  - Models of chaotic inflation
JF  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 08
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - On the de Sitter space-time : the geometric foundation of infaltionary cosmology
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 10
PB  - Univ.
CY  - Potsdam
ER  - 
TY  - BOOK
A1  - Reuter, Stefan
A1  - Schmidt, Hans-Jürgen
T1  - On the Wheeler-de Witt equation for homogeneous cosmological models
T3  - Preprint / Universität Potsdam, Fachbereich Mathematik
Y1  - 1992
VL  - 1992, 11
PB  - Univ.
CY  - Potsdam
ER  -