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arXiv 2503.03076gr-qchep-th
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K-essence框架中Raychaudhuri方程的非仿射推广

Non-Affine Extensions of the Raychaudhuri Equation in the K-essence Framework

Samit Ganguly, Goutam Manna, Debashis Gangopadhyay, Eduardo Guendelman, Abhijit Bhattacharyya

AI总结:

本文在k-essence框架中引入非仿射参数化修正Raychaudhuri方程,以非测地流曲线解释宇宙排斥效应,并利用DBI型拉格朗日量和贝叶斯分析解决哈勃张力、预言动力学暗能量及焦散规避特征。

摘要:

我们通过引入k-essence框架内的非仿射参数化,提出了Raychaudhuri方程(RE)的一条新路径。这一修改考虑了非测地流曲线,从而在宇宙演化中产生涌现的排斥效应。利用DBI型k-essence拉格朗日量,我们推导出一个修正的RE,并证明其有能力解决哈勃张力问题,同时预言动力学暗能量状态方程的自然涌现。我们的贝叶斯分析受到宇宙学数据的约束,支持k-essence场($\dotϕ$)与宇宙尺度因子($a$)之间的理论标度关系。此外,我们将修正的RE重新解释为一个反阻尼谐振子,发现了一个焦散规避特征,这可能揭示宇宙膨胀中的经典或类量子效应。这些结果表明标量场动力学与修正引力之间存在深层联系,为宇宙膨胀历史的本质提供了新的视角。

英文摘要:

We present a new avenue of the Raychaudhuri Equation (RE) by introducing a non-affine parametrization within the k-essence framework. This modification accounts for non-geodesic flow curves, leading to emergent repulsive effects in cosmic evolution. Using a DBI-type k-essence Lagrangian, we derive a modified RE and demonstrate its ability to address the Hubble tension while predicting a natural emergence of a dynamical dark energy equation of state. Our Bayesian analysis, constrained by cosmological data, supports the theoretical scaling relation of the k-essence field ($\dotϕ$) and the cosmic scale factor ($a$). Furthermore, we reinterpret the modified RE as an anti-damped harmonic oscillator, we found a caustic avoidance signature, it may reveal classical or quantum-like effects in cosmic expansion. These results suggest a deep connection between scalar field dynamics and modified gravity, offering new perspectives on the nature of the expansion history of the universe.

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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