753 citations · 768 across the 8 of their papers we have counts for
8 papers
Obstructions to global visibility of singularities in asymptotically flat spacetimes
Kanabar Jay, Kharanshu N. Solanki, Pankaj S. Joshi
Consider an -dimensional asymptotically flat spacetime and a future-directed, affinely parametrized outgoing null generator of an achronal boundary $\partial J^+(S_\vare…
Universality and Criticality in Mass-less Scalar Field Collapse
Koushiki, Rituparno Goswami, Pankaj S. Joshi
In this paper, we observe the collapse of a mass-less scalar field covariantly. We show that the strengths of the collapsing and dispersing modes of this scalar field will decide w…
Apparent horizon and causal structure of spacetime singularities
Koushiki, Pankaj S. Joshi
A major issue in general relativity and blackhole physics today is to determine the conditions when the spacetime singularities forming as end-states of gravitational collapse are…
On Formation of Primordial Naked Singularities
Koushiki, Pankaj S. Joshi, Sudip Bhattacharyya
The density fluctuations in the nearly homogeneous background in the very early universe are argued to be the origin of the cosmic structures we observe in our present universe. Al…
Low Mass Naked Singularities from Dark Core Collapse
Chandrachur Chakraborty, Sudip Bhattacharyya, Pankaj S. Joshi
Near-solar mass black holes (BHs) could have been involved in the two recent gravitational wave events, GW190425 and GW190814. Since such a low mass BH cannot be formed via stellar…
Tipler Naked Singularities in Dimensions
Kharanshu N. Solanki, Karim Mosani, Omkar Deshpande +1
A spacetime singularity, identified by the existence of incomplete causal geodesics in the spacetime, is called a (Tipler) strong curvature singularity if the volume form acting on…
Primordial naked singularities
Pankaj S. Joshi, Sudip Bhattacharyya
Primordial black hole formation has been discussed widely, when density perturbations in the early universe cause matter to collapse gravitationally, giving rise to these ultra-com…
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A
Sunny Vagnozzi, Rittick Roy, Yu-Dai Tsai +12
Horizon-scale images of black holes (BHs) and their shadows have opened an unprecedented window onto tests of gravity and fundamental physics in the strong-field regime. We conside…