Impact of Chaplygin gas model on the characteristics of gravastar in f(Q,T) gravity

In this paper, we study the properties of the gravastar, which is supported by Chaplygin gas. It is well known that Gravastar is a very lucrative alternative for black holes that do not suffer from the pathology of singularity. We have used a Chaplygin gas for the interior and shell as it can take the form of dark energy and a stiff matter phase. We also discussed the associated scalar field from which the Chaplygin gas can be derived. We find gravastar solutions in the [Formula: see text] framework. We have also given physical motivation to how the Chaplygin gas can form during the stars’ collapse from residue scalar fields. We have calculated and plotted all the relevant physical properties, like proper length, entropy, energy, etc., for such a gravastar. We have also used the Israel junction condition to find the potential across the thin shell with respect to various regular black holes like Bardeen, Hayward, and holonomy-corrected black holes. We have calculated the speed of sound and hence commented on the stability of the gravastar for all four cases. We have also calculated the deflection angle for all such exteriors and given phenomenological predictions of how this model can be tested via next-generation radio telescopes. Finally, we conclude this paper by pointing out the future scope of our research.