Abstract
What is the fate of a star after it has exhausted its nuclear fuel? It can no longer remain in equilibrium, and must undergo gravitational collapse. If the stsar is not too massive it may settle down to a white dwarf or a neutron star. However, if the star is more massive than a few solar masses, then we have to invoke the general theory of relativity to study its final state. This theory is valid up to the Planck length (10-33 cm), below which quantum effects becomes important. In the early seventies, it was shown that singularities develop as a result of gravitational collapse where quantities such as the energy density of the collapsing matter and the curvature of the spacetime diverge [1]. However, the singularity theorems only predict the existence of singularities, but do not give any information about their nature or causal structure, e.g., can such a singularity communicate with a distant observer in the universe.
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Beesham, A., Ghosh, S.G. (2001). Gravitational Collapse. In: Sidharth, B.G., Altaisky, M.V. (eds) Frontiers of Fundamental Physics 4. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1339-1_15
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