10th International Conference on Gravitation and Cosmology: New Horizons and Singularities in Gravity (ICGC 2023)

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

Not scheduled

15m

IIT Guwahati

Oral Classical & Quantum Gravity Classical & Quantum Gravity

Speaker

Koushiki Bhattacharyya (Ahmedabad University)

Description

We study here the unhindered gravitational collapse of spatially homogeneous (SH) scalar fields $\varphi$ with a potential $V_s(\varphi )$, 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. We show that for both scalar and vector fields, classes of potentials exist that give rise to black holes or naked singularities. There are 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.
Phys. Rev. D 108, 044049, 2023