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Investigating the physical properties of traversable wormholes in the modified f(R, T) gravity

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Abstract

Wormholes are considered to be hypothetical tunnels connecting two distant regions of the universe or two different universes. In general relativity (GR), the formation of traversable WH requires the consideration of exotic matter that violates energy conditions (ECs). If the wormhole geometry can be described in modified gravitational theories without introducing exotic matter, it will be significant for studying these theories. In the paper, we analyze some physical properties of static traversable WH within the framework of f(R, T) modified gravitational theory. Firstly, we explore the validity of the null, weak, dominant and strong energy conditions for wormhole matter for the considered \(f(R,T)=R+\alpha R^2+\lambda T\) model. Research shows that it is possible to obtain traversable WH geometry without bring in exotic matter that violates the null energy condition (NEC) in the f(R, T) theory. The violation of the dominant energy condition (DEC) in this model may be related to quantum fluctuations or indicates the existence of special matter that violates this EC within the wormhole. Moreover, it is found that in the \(f(R,T)=R+\alpha R^2+\lambda T\) model, relative to the GR, the introduction of the geometric term \(\alpha R^2\) has no remarkable impact on the wormhole matter components and their properties, while the appearance of the matter-geometry coupling term \(\lambda T\) can resolve the question that WH matter violates the null, weak and strong energy condition in GR. Additionally, we investigate dependency of the valid NEC on model parameters and quantify the matter components within the wormhole using the “volume integral quantifier”. Lastly, based on the modified Tolman–Oppenheimer–Volkov equation, we find that the traversable WH in this theory is stable. On the other hand, we use the classical reconstruction technique to derive wormhole solution in f(R, T) theory and discuss the corresponding ECs of matter. It is found that all four ECs (NEC, WEC, SEC and DEC) of matter in the traversable wormholes are valid in this reconstructed f(R, T) model, i.e we provide a wormhole solution without introducing the exotic matter and special matter in f(R, T) theory.

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Acknowledgements

The research work is supported by the National Natural Science Foundation of China (12175095,12075109 and 11865012), and supported by LiaoNing Revitalization Talents Program (XLYC2007047).

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  1. Department of Physics, Liaoning Normal University, Dalian, 116029, People’s Republic of China

    Jianbo Lu, Mou Xu, Jing Guo & Ruonan Li

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  1. Jianbo Lu
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Lu, J., Xu, M., Guo, J. et al. Investigating the physical properties of traversable wormholes in the modified f(R, T) gravity. Gen Relativ Gravit 56, 37 (2024). https://doi.org/10.1007/s10714-024-03223-x

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