IUCAA Preprints
Permanent URI for this communityhttp://localhost:4000/handle/11007/149
Browse
8 results
Search Results
Item Why do naked singularities form in gravitational(2002-03-12) Joshi, P. S.; Dadhich, Naresh; Roy, MaartensWe investigate what are the key physical features that cause the development of a naked singularity, rather than a black hole, as the end-state of spherical gravitational collapse. We show that sufficiently strong shearing effects near the singularity delay the formation of the apparent horizon. This exposes the singularity to an external observer, in contrast to a black hole, which is hidden behind an event horizon due to the early formation of an apparent horizonItem 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.Item Spherical and non-spherical gravitational collapse in Hussain spacetime(2011-06-06) Patil, K. D.; Thool, U. S.We investigate the nature of singularities arising in Husain solution. We analyze both spherical and non-spherical gravitational collapse in Husain spacetime. An interesting feature that emerges is that gravitational collapse of spherical cosmological Husain solution lead to the formation of naked singularities, while non-spherical cosmological collapse proceeds to form a black hole. Further strength of naked singularities arising in these spacetimes has been analyzed. It is found that these naked singularities are strong in Tipler’s sense.Item Non-spherical gravitational collapse of strange quark matter(2007-03-10) Patil, K. D.; Zade, S. S.; Mohod, A. N.We study the non-spherical gravitational collapse of the strange quark null fluid. The interesting feature which emerges is that the non-spherical collapse of charged strange quark matter leads to a naked singularity whereas the gravitational collapse of neutral quark matter proceeds to form a black hole. In the present brief report we extend the earlier work of T.Harko and K.S.Cheng to the non-spherical case.Item Gravitational collapse of radiating Dyon solution and cosmic censorship hypothesis(2007-11-20) Patil, K. D.; Zade, S. S.; Mohod, A. N.We investigate the possibility of cosmic censorship violation in the gravitational collapse of radiating dyon solution. We show that the final outcome of the collapse depends sensitively on the electric and magnetic charge parameters. The graphs of the outer apparent horizon, inner Cauchy horizon for different values of parameters have been drawn. It is found that the the electric and magnetic components push the apparent horizon towards the advanced time coordinate axis, which in turn reduces the radius of the apparent horizon in Vaidya space- time. In the present paper we extend the earlier work of A. Chamorro and K. S. Virbhadra.Item Nature of the singularities in higher dimensional husain spacetime(2006-06-10) Patil, K. D.; Zade, S. S.We generalize the previous studies of the spherically symmetric gravitational collapse in four dimensional spacetime to higher dimensions. It is found that the central singularities may be naked in higher dimensions but depend sensitively on the choices of the parameters. These naked singularities are found to be gravitationally strong that violate the cosmic censorship hypothesis.