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gr-qc2026
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…
astro-ph.CO2026
Impact of Primordial Black Hole population on 21 cm observables at high redshift
Atrideb Chatterjee, Barun Maity, Koushiki
The 21-centimetre (21-cm) signal is one of the most promising probes of the high-redshift Universe. It has typically been modelled without accounting for the effects of active gala…