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arXiv 2602.18013gr-qchep-th
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从基本常数的同时变化中获得宇宙加速

Cosmological Variation of Proton-to-Electron Mass Ratio in a Chameleon-Brans-Dicke Theory

School of Advanced Sciences, Vellore Institute of Technology(维洛尔理工学院高等科学学院)

Malavika K, Soumya Chakrabarti

AI总结:

该研究探讨了基本常数同时变化对宇宙加速的影响,通过对比实验室限制和理论推导,揭示了宇宙加速可能源于基本耦合常数的演化。

摘要:

我们讨论了两个基本实体同时发生宇宙变化的可能性:牛顿引力耦合常数G和电子质量m_e。我们表明,这种变化可以解释晚期宇宙加速,而无需引入宇宙常数或显式的暗能量流体。我们比较了推导出的m_e变化与从类星体吸收光谱中发现的实验室限制。我们的结果表明,晚期宇宙加速可能是演化的基本耦合常数的表现,建立了高精度重力测试、粒子物理和宇宙加速起源之间的直接桥梁。

英文摘要:

We investigate the cosmological variation of the proton-to-electron mass ratio, $μ=m_p/m_e$, within a generalized Brans-Dicke framework with two scalar fields : a geometric scalar field governing the effective gravitational coupling and a matter field whose effective potential has a Higgs-like symmetry-breaking structure. We consider a cosmological background described by a Padé-deformed $Λ$CDM and constrain it using a combination of late-time cosmological observational data-sets. We use the resulting expansion history to reconstruct the scalar-field and the matter-sector vacuum expectation value. We calculate the induced variation of $μ$ and compare it with observational constraints from quasar absorption spectra. We find that a standard Brans-Dicke model with a minimally coupled Higgs-like field produces an unphysical variation of $μ$. Only after introducing a chameleon-like coupling between the Brans-Dicke scalar and the baryonic matter, we find that the resulting variation is well-suppressed and satisfies the observational bounds.

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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