发表机构
Beihang University; Institute for Basic Science; Peking University（北京航空航天大学; 基础科学研究院; 北京大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过分析希格斯真空期望值变化对核合成速率的影响，发现提高1.58%可调和轻元素丰度观测与CMB约束，0.2%提升可部分缓解宇宙锂问题。
AI 中文摘要
希格斯真空期望值（VEV）会改变电弱相互作用和强相互作用的速率。我们研究了这两种效应对大爆炸核合成（BBN）的影响，并寻求观测到的轻元素原始丰度与来自宇宙微波背景（CMB）涨落和各向异性的宇宙学约束之间的一致性。我们发现原始4He丰度与希格斯VEV之间存在强烈的负相关。因此，利用BBN期间希格斯VEV比当前值提高1.58%的情况，可以在EMPRESS小组观测到的新原始4He丰度、由高红移类星体视线方向莱曼α森林吸收线确定的氘丰度以及斯皮特平台上锂丰度之间达成一致。这种一致性要求重子-光子比不同于CMB的测定值，表明在BBN和重组之间需要非标准宇宙学演化。我们还证明，希格斯VEV提高0.2%可以部分缓解“宇宙锂问题”，同时保持与CMB的一致性，剩余的差异可能由恒星 depletion 机制解释。
英文摘要
The Higgs vacuum expectation value (VEV) alters both the electroweak and strong interaction rates. We study both effects on Big Bang Nucleosynthesis (BBN) and seek concordance between observed primordial abundances of light elements and cosmological constraints from cosmic microwave background (CMB) fluctuations and anisotropies. We find a strong negative correlation between primordial 4He abundance and the Higgs VEV. Consequently, using a 1.58% uplift of the Higgs VEV during BBN from the current value, an agreement can be achieved among the new primordial 4He abundance, observed by the EMPRESS group, Deuterium abundance determined from absorption lines in the Lyman-alpha forest along the line-of-sight of high-redshift quasars, and the lithium abundance on the Spite plateau. This agreement requires a baryon-to-photon ratio different from the CMB determination, indicating the need for non-standard cosmological evolution between BBN and recombination epochs.We also demonstrate that a 0.2% uplift in the Higgs VEV can partially alleviate the "cosmic Li problem", keeping consistency with the CMB with remaining discrepancy potentially accounted for by stellar depletion mechanisms.
Comments11 pages, 5 figures, accepted by Phys. Rev. D
