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arXiv 2607.04744gr-qc
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在R平方引力中的旋转费米子-玻色子星

Rotating Fermion-Boson Stars in $R$-squared Gravity

Universitat de València(瓦伦西亚大学);Universidad Nacional Autónoma de México(墨西哥国立自治大学);Sofia University “St. Kliment Ohridski”(索非亚大学(圣克利门特·奥赫里斯基));Bulgarian Academy of Sciences(保加利亚科学院)

Saeed Fakhry, Jorge Castelo Mourelle, Nicolas Sanchis-Gual, Daniela Doneva, Stoytcho Yazadjiev, José A. Font

AI总结:

研究在R平方f(R)引力框架下构建静态和均匀旋转的费米子-玻色子星,用状态方程和自相互作用复玻色子场建模,结果表明标量自由度改变分布、扩大平衡解域并增加最大支持质量。

摘要:

费米子-玻色子星是由普通费米子物质和仅通过引力相互作用的玻色子暗成分组成的紧凑平衡构型。我们在R平方f(R)引力框架内构建静态和均匀旋转的费米子-玻色子星,其特征为f(R)=R+aR²。结果表明标量自由度改变了玻色子场和费米子压力的空间分布等。

英文摘要:

Fermion-boson stars are compact equilibrium configurations composed of ordinary fermionic matter and a bosonic dark component interacting only through gravity. Such systems provide a natural framework for exploring deviations from standard neutron-star models, including the possible accumulation of dark matter inside neutron stars, and may be relevant for compact objects near the low-mass black-hole gap. We construct static and uniformly rotating fermion-boson stars within the framework of $R$-squared $f(R)$ gravity, characterized by the functional form $f(R)=R+aR^{2}$, where $a$ is a positive parameter governing the effective mass scale from the scalar degree of freedom. The fermionic sector is modeled as a perfect fluid described by a tabulated equation of state at zero temperature, while the bosonic component is represented by a self-interacting complex bosonic field. Our results show that the scalar degree of freedom modifies the spatial distribution of both the bosonic field and the fermionic pressure, enlarges the domain of admissible equilibrium solutions, and increases the maximum supported masses relative to general relativity. Our models remain compatible with current astrophysical and gravitational-wave constraints, suggesting that fermion-boson stars in $R$-squared gravity offer a promising framework to investigate the combined effects of dark bosonic matter, rotation, and strong-field modifications of gravity in compact objects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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