摘要:

AbstractThe article deals with the physical parameters of rotating bodies in the bimetric theory of gravitation in second approximation in the angular velocity. The authors present the results of calculations carried out for configurations whose state of matter is described by monoparametric equations of ideal neutron gas and relativistic polytropes.

ISSN:0004-6337    

DOI:10.1002/asna.2113090402

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe stability of the innermost disk region orbiting a Kerr black hole is investigated for geometrically thin accretion disks. The infalling matter transports mass and angular momentum into the Kerr hole. This affects the inner disk boundary and leads to runaway instabilities in some cases.

ISSN:0004-6337    

DOI:10.1002/asna.2113090403

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113090404

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractOur recent Lagrangian approach to the equations of motion for test particles with internal structure can be enlarged to the laws of motion for interacting particles, at least in principle. As an example we consider the interaction of point particles endowed with a pole‐dipole structure of the non‐abelian cha

ISSN:0004-6337    

DOI:10.1002/asna.2113090405

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractWe consider one‐soliton perturbations of a flat Friedmann‐Robertson‐Walker (FRW) cosmological model, with an ideal fluid with pressure equal to the energy density (stiff fluid), in the case where the “pole trajectory” parameter is negative, introducing thereby singularities along certain null hypersurfaces.Starting with a metric that approaches asymptotically the FR W background, we show that it is possible to construct an extension through these hypersurfaces such that the energy momentum tensorTabis finite and satisfies the energy conditions. The extension is onlyC1, providing a sort of “shock front” with continuity inTab, that has an associated phase transition from null dust to stiff fluid, the transition being of the form described by CHANDRASEKHAR and

ISSN:0004-6337    

DOI:10.1002/asna.2113090406

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractIn the framework of Riemannian geometry alternative theories of gravitation with field equations differing from Einstein's are discussed. Examples of physically acceptable alternative theories with second, third or fourth‐order field equations and without or with an additional coupling constant are give

ISSN:0004-6337    

DOI:10.1002/asna.2113090407

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113090409

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractA solution of the higher‐dimensional Einstein‐Maxwell‐dilation equations with a Ricci‐flat internal manifold and a 4‐geometry describing a non‐rotating charged black hole is presented. The black hole carries a scalar hair formed by a linear combination of the dilaton and the internal s

ISSN:0004-6337    

DOI:10.1002/asna.2113090410

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

ISSN:0004-6337    

DOI:10.1002/asna.2113090412

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe field equations of BUCHDAHL and WÜNSCH for the description of fields of particles with nonzero rest mass and arbitrary spin in curved space‐times are considered. The Lagrangian, the field equations and the energy‐momentum tensor for fields of integer spin are formulated by means of real tensor fi

ISSN:0004-6337    

DOI:10.1002/asna.2113090413

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY