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Examining the behavior of exotic compact stars within the f(R, T) gravity under Finch-Skea and Tolman IV spacetimes
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DOI：10.1016/j.nuclphysb.2026.117573.png)
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Abstract
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In this work, two analytical solutions are proposed to characterize compact star configurations containing an effective negative-pressure fluid in the f(R, T) gravity paradigm that admit spherically symmetric geometry. We derive a system of modified field equations by taking into account a static interior spacetime, which consists of both negative-pressure fluid and ordinary matter sources. In order to investigate the interactions between the fluid components, we solve the field equations using two different equations of state. As the gravitational equations still contain more unknowns, we further use the Finch-Skea and Tolman IV spacetimes which lead us to two distinct models. The junction conditions are also applied to compute the constants associated with these solutions. Afterwards, our developed models’ feasibility is explored by contrasting them with the observed characteristics of two particular stars, SAX J1808.4–3658 and Her X-1. Under certain parametric values, our results demonstrate that both the developed fluid configurations are physically realistic in this minimally coupled gravity framework.
Keywords:
04.20.Jb
04.50.Kd
04.40.-b
Modified theory
Exotic compact stars
Junction conditions
Stability
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