6 papers · 1 filter
Some remarks on the horizon in the dust cloud collapse
Koushiki, W. Piechocki, G. Plewa
We examine the existence of an apparent horizon in the collapse of an isolated dust cloud using expansion functions. Our results indicate that in the region of spacetime far away f…
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…
A bonafide model of structure formation from gravitational collapse
Koushiki, Dipanjan Dey, Pankaj S. Joshi
This paper explores the cosmological implications of a scalar field with a specific potential, crucial for achieving the final equilibrium state of gravitational collapse. We consi…
Equilibrium states from gravitational collapse of minimally coupled scalar field with non-zero potential
Dipanjan Dey, Koushiki, Pankaj S. Joshi
We study the model of spherically symmetric and spatially homogeneous gravitational collapse of a minimally coupled scalar field. Our study focuses on obtaining the scalar field po…
Gravitational collapse of scalar and vector fields
Karim Mosani, Koushiki, Pankaj S. Joshi +2
We study here the unhindered gravitational collapse of spatially homogeneous (SH) scalar fields with a potential , as well as vector fields with a potenti…