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arXiv 2409.01468gr-qc
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在具有可变G的重构类牛顿引力中宇宙学膨胀的新框架

A new framework for cosmological expansion in a reformulated Newtonian-Like gravity with variable G

Felipe S. Escórcio, Júlio C. Fabris, Júnior D. Toniato, Hermano Velten

AI总结:

提出保留牛顿第二定律的类牛顿引力新变体,通过随时间演化的标量场驱动的动态有效引力耦合,实现了纯物质主导宇宙的加速膨胀并增强了物质密度扰动增长。

摘要:

受 Brans-Dicke 引力拉格朗日量启发,一种类牛顿理论已在文献 arXiv:2009.04434(v4) 中被近期提出。我们在此提出该理论的一个新变体,使得通常的牛顿第二定律得以保留。我们分析了其宇宙学解,并发现即使在纯物质主导的宇宙中,也能获得加速的背景膨胀。这是由于有效引力耦合的动态特性所致,该耦合由一个随时间演化的标量场作为源。我们还分析了物质密度扰动,发现与 Einstein-de Sitter 模型中通常的类牛顿行为相比,它们表现出增强的增长。

英文摘要:

A Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian has been recently proposed in Ref. arXiv:2009.04434(v4). We propose here a new variant of this theory such that the usual Newtonian second law is preserved. The cosmological solutions are analysed and accelerated background expansion can be obtained even in a pure matter dominated universe. This happens due to the dynamic character of the effective gravitational coupling which is sourced by a time evolving scalar field . We also analyse the matter density perturbations and find they exhibit an enhanced growth in comparison with the usual Newtonian like behavior in Einstein-de Sitter model.

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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