English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

In gravitational collapse, we often see that curvature singularities appear. Since gravity seems to be very strong near singularities, we want to expect that singularities must be contained in a black hole. However, in some gravitational collapse, a curvature singularity that can be visible for an observer at null infinity appears. Such singularity is called globally naked singularity because it is not wrapped by an event horizon. At naked singularity, the physical theory may break down, and we may observe it. Then, in order to certify the predictability of known physics, it is important to ask whether a singularity can be naked or not. Motivated by fundamental theories in higher dimension such as string theory, in this thesis, we focus on the spherically symmetric spacetime with collapsing inhomogeneous dust cloud in any dimension, and will discuss the generation of the naked singularity for each spacetime dimension. Especially, in the five-dimensional case, by using a new method, we prove the existence and non-existence of solutions to null geodesic equations emanating from the central singularity for smooth initial distribution of dust. Moreover, we also show that the null geodesics can extend to null infinity in a certain case, which implies violation of the weak cosmic censorship conjecture.

Violation of Weak Cosmic Censorship in a Gravitational Dust Collapse