منابع مشابه
Gravitational collapse and naked singularities
Gravitational collapse is one of the most striking phenomena in gravitational physics. The cosmic censorship conjecture has provided strong motivation for researches in this field. In the absence of general proof for the censorship, many examples have been proposed, in which naked singularity is the outcome of gravitational collapse. Recent development has revealed that there are examples of na...
متن کاملNaked Singularities and Quantum Gravity
There are known models of spherical gravitational collapse in which the collapse ends in a naked shell-focusing singularity for some initial data. If a massless scalar field is quantized on the classical background provided by such a star, it is found that the outgoing quantum flux of the scalar field diverges in the approach to the Cauchy horizon. We argue that the semiclassical approximation ...
متن کاملGlobal Visibility of Naked Singularities
Global visibility of naked singularities is analyzed here for a class of spherically symmetric spacetimes, extending previous studies limited to inhomogeneous dust cloud collapse to more physical valid situations in which pressures are non-vanishing. Existence of nonradial geodesics escaping from the singularity is shown, and the observability of the singularity from far-away observers is discu...
متن کاملNaked Singularities in Higher Dimensional Gravitational Collapse
Spherically symmetric inhomogeneous dust collapse has been studied in higher dimensional spacetime and the factors responsible for the appearance of a naked singularity are analyzed in the region close to the centre for the marginally bound case. It is clearly demonstrated that in the former case naked singularities do not appear in the space-time having more than five dimension, which appears ...
متن کاملNaked singularities in four-dimensional string backgrounds.
It is shown that gauged nonlinear sigma models can be always deformed by terms proportional to the field strength of the gauge fields (nonminimal gauging). These deformations can be interpreted as perturbations, by marginal operators, of conformal coset models. When applied to the SL(2, R) × SU(2)/ (U(1)× U(1)) WZWN model, a large class of four-dimensional curved spacetime backgrounds are obtai...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics D
سال: 2003
ISSN: 0218-2718,1793-6594
DOI: 10.1142/s0218271803003335