Zobrazeno 1 - 10
of 140
pro vyhledávání: '"Mielke, Eckehard W."'
Publikováno v:
Phys.Rev.D43:3895-3901,1991
We investigate the stability of general-relativistic boson stars by classifying singularities of differential mappings and compare it with the results of perturbation theory. Depending on the particle number, the star has the following regimes of beh
Externí odkaz:
http://arxiv.org/abs/0810.0696
Autor:
Schunck, Franz E., Mielke, Eckehard W.
Publikováno v:
Proc. of the Ninth Marcel Grossman Meeting on General Relativity, Rome, 2000, V.G.Gurzadyan, R.Jantzen and R.Ruffini, eds. (World Scientific, Singapore 2002) pp. 2003-2004
We reconsider the nonlinear second order Abel equation of Stewart and Lyth, which follows from a nonlinear second order slow-roll approximation. We find a new eigenvalue spectrum in the blue regime. Some of the discrete values of the spectral index n
Externí odkaz:
http://arxiv.org/abs/0809.4462
Autor:
Schunck, Franz E., Mielke, Eckehard W.
Publikováno v:
Class.Quant.Grav.20:R301-R356,2003
There is accumulating evidence that (fundamental) scalar fields may exist in Nature. The gravitational collapse of such a boson cloud would lead to a boson star (BS) as a new type of a compact object. Similarly as for white dwarfs and neutron stars,
Externí odkaz:
http://arxiv.org/abs/0801.0307
Autor:
Mielke, Eckehard W.
Publikováno v:
Phys.Rev.D77:084020,2008; Erratum-ibid.D77:109902,2008
The curvature-squared model of gravity, in the affine form proposed by Weyl and Yang, is deduced from a topological action in 4D. More specifically, we start from the Pontrjagin (or Euler) invariant. Using the BRST antifield formalism with a double d
Externí odkaz:
http://arxiv.org/abs/0707.3466
A possible equivalence of scalar dark matter, the inflaton, and modified gravity is analyzed. After a conformal mapping, the dependence of the effective Lagrangian on the curvature is not only singular but also bifurcates into several almost Einstein
Externí odkaz:
http://arxiv.org/abs/0704.1135
Galactic dark matter is modelled by a scalar field in order to effectively modify Kepler's law without changing standard Newtonian gravity. In particular, a solvable toy model with a self-interaction U(Phi) borrowed from non-topological solitons prod
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608526
Autor:
Mielke, Eckehard W.
Publikováno v:
AIP Conf.Proc.857B:246-257,2006
Anomalies in Yang-Mills type gauge theories of gravity are reviewed. Particular attention is paid to the relation between the Dirac spin, the axial current j_5 and the non-covariant gauge spin C. Using diagrammatic techniques, we show that only gener
Externí odkaz:
http://arxiv.org/abs/hep-th/0605159
Autor:
Schunck, Franz E., Mielke, Eckehard W.
Publikováno v:
Phys.Lett. B485 (2000) 231-238
By using the rather stringent nonlinear second order slow-roll approximation, we reconsider the nonlinear second order Abel equation of Stewart and Lyth. We determine a new blue eigenvalue spectrum. Some of the discrete values of the spectral index $
Externí odkaz:
http://arxiv.org/abs/astro-ph/0006348
Publikováno v:
Phys.Rev.D61:081501,2000
A four-parameter class of exact asymptotically flat solutions of the Einstein-Maxwell equations involving only rational functions is presented. It is able to describe the exterior field of a slowly or rapidly rotating neutron star with poloidal magne
Externí odkaz:
http://arxiv.org/abs/gr-qc/0001081