Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Marcus Kriele"'
Autor:
Marcus Kriele, Sean A. Hayward
Publikováno v:
Journal of Mathematical Physics. 38:1593-1604
We give a new definition of “closed outer trapped surface’’ with respect to a hypersurface and show that the boundary of the trapped region (the apparent horizon) is a marginally trapped surface, i.e., has vanishing outer null expansion. While
Autor:
Marcus Kriele
Publikováno v:
Classical and Quantum Gravity. 14:153-163
We study irrotational, three-dimensional dust spacetimes and show that their only dynamical singularities are shell singularities in the sense of Kriele, Lim and Scott (1994). These singularities are weak and generically naked.
Autor:
Marcus Kriele
Publikováno v:
Banach Center Publications. 41:169-178
We present a stable class of spacetimes which satisfy the conditions of the singularity theorem of Hawking & Penrose (1970), and which contain naked singularities. This offers counterexamples to a geometric version of the strong cosmic censorship hyp
Autor:
Marcus Kriele
Publikováno v:
General Relativity and Gravitation. 28:1409-1413
Publikováno v:
Classical and Quantum Gravity. 13:1161-1182
In a four-dimensional Lorentzian manifold, a family of light rays emanating orthogonally from a spacelike 2-surface generates a `wavefront'. The caustic of a wavefront is the set of all points where the wavefront fails to be an (immersed) submanifold
Autor:
Marcus Kriele, Giselle Lim
Publikováno v:
Classical and Quantum Gravity. 12:3019-3035
We study a class of singularities of prescribed behaviour and investigate physical properties such as their strength, and the validity of energy conditions in a neighbourhood of these singularities. As applications of our theory, we show that shell (
Autor:
Marcus Kriele
Publikováno v:
Journal of Mathematical Physics. 36:3676-3693
The initial value problem for a compact, spherically symmetric star with a rather general equation of state is discussed. For any given time it is possible to calculate the area of the spheres of symmetry which intersect the boundary, if space–time
Publikováno v:
Classical and Quantum Gravity. 11:2761-2779
We introduce and give the motivation for the concept of shell singularities. Shell singularities are a generalization of shell crossing singularities to spacetimes which are not necessarily spherically symmetric. We give a definition of strong cosmic
Autor:
Marcus Kriele
Publikováno v:
Classical and Quantum Gravity. 11:1325-1330
Signature (type) changing spacetimes are the classical limit of a variant of the no-boundary proposal of Hartle and Hawking (1983). I study spacetimes where the Einstein equation is coupled to a scalar field and give a heuristic, semiclassical argume
Autor:
Marcus Kriele
Publikováno v:
Classical and Quantum Gravity. 10:1525-1539
The author shows that shell (crossing) singularities are at least marginally trapped, if the ratio of pressure and energy density tends to a nonzero constant for diverging energy density. This result gives strong support for weak cosmic censorship of