7–12 Jul 2024
Aurum, the ‘Gabriele d’Annunzio’ University and ICRANet
Europe/Rome timezone

End-state of gravitational collapse of scalar and vector fields: Strong naked singularities

Not scheduled
20m
Aurum, the ‘Gabriele d’Annunzio’ University and ICRANet

Aurum, the ‘Gabriele d’Annunzio’ University and ICRANet

Pescara, Italy
Talk in a parallel session Wormholes, energy conditions and time machines Wormholes, energy conditions and time machines

Speaker

Ms Koushiki Bhattacharyya (Ahmedabad University)

Description

In this presentation, I will discuss about the unhindered gravitational collapse of spatially homogeneous (SH) scalar fields $\phi$ with a potential $V_{s}(\phi)$, as well as vector fields $\tilde{A}$ with a potential $V_{v}(B)$ where $B=g(\tilde{A},\tilde{A})$ and $g$ is the metric tensor. If the past end-point of a causal geodesic is a singularity, then this singularity is said to be naked. Such a singularity is strong if the volume of an object vanishes when it approaches the singularity. I will discuss our results that for both scalar and vector fields, classes of potentials exist that give rise to black holes or naked singularities. I will also discuss about the classes of potentials, as well, for which the resultant singularities are strong. There is a non-zero subset of such potentials where the resultant singularities are both naked and strong. This talk is based on Phys. Rev. D 108, 044049, 2023.

Primary authors

Dr Karim Mosani (International Centre for Space and Cosmology, School of Arts and Sciences,Ahmedabad University) Ms Koushiki Bhattacharyya (Ahmedabad University)

Co-authors

Mr Jay Verma Trivedi (International Centre for Space and Cosmology, School of Arts and Sciences,Ahmedabad University) Prof. Pankaj S Joshi (International Centre for Space and Cosmology, School of Arts and Sciences,Ahmedabad University) Dr Tapobroto Bhanja (International Centre for Cosmology and PDPIAS, Charotar University of Science and Technology)

Presentation materials

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