IUCAA Preprints
Permanent URI for this communityhttp://localhost:4000/handle/11007/149
Browse
18 results
Search Results
Item Radiating Kerr-Newman black hole in f(R) gravity(IUCAA, 2015-02) Ghosh, S. G.; Maharaj, S. D.; Papnoi, UmaItem Spinning Higher Dimensional Einstein-Yang-Mills black holes(IUCAA, 2015-02) Ghosh, S. G.; Papnoi, UmaItem On naked singularities in higher dimensional Vaidya space-times(2001-04-03) Ghosh, S. G.; Dadhich, NareshWe investigate the end state of gravitational collapse of null fluid in higher di- mensional space-times. Both naked singularities and black holes are shown to be developing as final outcome of the collapse. The naked singularity spectrum in col- lapsing Vaidya region (4D) gets covered with increase in dimensions and hence higher dimensions favor black hole in comparison to naked singularity. The Cosmic Censor- ship Conjecture will be fully respected for a space of infinite dimensionItem Non-spherical collapse of a radiating star(2002-04-01) Ghosh, S. G.; Deshkar, D. W.We study the junction conditions for non-spherical (plane symmetric) collapsing ra- diating star consisting of a shearing fluid undergoing radial heat flow with outgoing radiation. Radiation of the system is described by plane symmetric Vaidya solution. Physical quantities relating to the local conservation of momentum and surface red-shift are also obtained.Item Non-marginally bound inhomogeneous dust collapse in higher dimensional space-time(2002-03-01) Ghosh, S. G.; Banerjee, A.We investigate the occurrence and nature of a naked singularity in the gravitational collapse of an inhomogeneous dust cloud described by a self-similar higher dimensional Tolman-Bondi space-time. Bound, marginally bound and unbound space-times are analyzed. The degree of inhomogeneity of the collapsing matter necessary to form a naked singularity is given.Item On naked singularities in higher dimensional Vaidya space-times(2000-08-16) Ghosh, S. G.; Dadhich, NareshWe investigate the end state of gravitational collapse of null fluid in higher di- mensional space-times. Both naked singularities and black holes are shown to be developing as final outcome of the collapse. The naked singularity spectrum in col- lapsing Vaidya region (4D) gets covered with increase in dimensions and hence higher dimensions favor black hole in comparison to naked singularity. The Cosmic Censor- ship Conjecture will be fully respected for a space of infinite dimension.Item Higher Dimensional Radiation Collapse and Cosmic Censorship(2000-11-12) Ghosh, S. G.; Saraykar, R. V.We study the occurrence of naked singularities in the spherically symmetric collapse of radiation shells in a higher dimensional spacetime. The necessary conditions for the formation of a naked singularity or a black hole are obtained. The naked singularities are found to be strong in the Tipler’s sense and thus violating cosmic censorship conjecture.Item Collapsing shells of radiation in higher dimensional spacetime and cosmic censorship conjecture(2001-06-26) Ghosh, S. G.; Saraykar, R. V.; Beesham, A.Gravitational collapse of radiation shells in a non self-similar higher dimensional spherically symmetric spacetime is studied. Strong curvature naked singularities form for a highly inhomogeneous collapse, violating the cosmic censorship conjecture. As a special case, self similar models can be constructed.Item Gravitational collapse of null strange quark fluid and cosmic censorship(2002-04-01) Ghosh, S. G.; Dadhich, NareshWe study gravitational collapse of the general spherically symmetric null strange quark fluid having the equation of state, p = (ρ − 4B)/n, where B is the bag constant. An interesting feature that emerges is that the initial data set giving rise to naked singularity in the Vaidya collapse of null fluid gets covered due to the presence of strange quark matter component. Its implication to the Cosmic Censorship Conjecture is discussed.Item Gravitational collapse of type II fluid in higher dimensional space-times(2002-04-30) Ghosh, S. G.We find the general solution of the Einstein equation for spherically symmetric collapse of Type II fluid (null strange quark fluid) in higher dimensions. It turns out that the nakedness and curva- ture strength of the shell focusing singularities carry over to higher dimensions. However, there is shrinkage of the initial data space for a naked singularity of the Vaidya collapse due to the presence of strange quark matter.