Original title: Non-extensive entropy signatures in compact star
B. N. Jayawiguna, M. H. Al Ghifari, A. Rohim, A. Sulaksono · September 2026
Physicists want to know if modified rules of gravity can explain unusual compact stars. The researchers used non-extensive entropyA measure of disorder that doesn't scale simply with system size, used here for black holes and stars. models, which change how we calculate disorder on a black-hole horizon, to modify standard gravity. They used this modified gravity to model quark stars, which are dense stars made of quark matter described by the MIT bag modelA model that treats quark matter as free quarks confined within a 'bag' by constant pressure, used to describe quark stars.. The gravity changes how matter packs together inside the star. They found that these modeled stars match real astronomical limits from compact objects linked to HESS J1731-347 and GW190814. Every tested model satisfied stability and energy requirements, including the speed of soundThe speed at which disturbances propagate in a medium; here, it indicates stability in stellar matter.. This shows exotic stars are a credible testing ground for non-extensive entropy theories like Barrow, Tsallis-Cirto, and Rényi.
Imagine packing a suitcase for a trip where the suitcase fabric stretches based on what you put inside. Usually, you fold clothes and hope it fits, but here the suitcase itself changes shape depending on your packing strategy, making it hard to predict if it will hold everything. In this paper, the entropy models are like the stretching fabric, applied to quark stars as the packed items, and the modified gravity is the changing suitcase shape, allowing the stars to fit within observational limits and show the framework is plausible.
Astronomers and physicists can use these models to test theories about dense stellar objects. It links abstract entropy concepts to real observational data, aiding in understanding gravity and matter under extreme conditions.
The abstract does not claim the models are proven; it only suggests they are a credible framework. It focuses on specific observational bounds and does not cover all compact objects. The study is theoretical and does not provide direct experimental evidence.
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Non-extensive entropy signatures in compact star — B. N. Jayawiguna, M. H. Al Ghifari, A. Rohim et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.