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arXiv 2602.23915hep-phastro-ph.CO
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非标准中微子-电子相互作用对大爆炸核合成的影响

Impact of non-standard neutrino-electron interactions on Big Bang Nucleosynthesis

Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València（粒子物理研究所，西班牙科学理事会-巴伦西亚大学）；University of Turin, Physics department and INFN, Sezione di Torino（都灵大学，物理系和意大利国家核物理研究所，都灵分部）；Dipartimento di Fisica “Ettore Pancini”, Università degli studi di Napoli “Federico II”（费迪南德二世那不勒斯大学，“埃托雷·潘奇尼”物理学系）；INFN - Sezione di Napoli（意大利国家核物理研究所，那不勒斯分部）

Julien Froustey, Stefano Gariazzo, Jaume Moncho, Sergio Pastor, Ofelia Pisanti

备注：
25 pages, 12 figures, 4 tables. Version 3 matches the accepted manuscript to appear in JCAP. Version 2 addresses an inconsistent treatment of the initial baryon-to-photon ratio when varying the NSI parameters, that affected the final deuterium abundance. The main conclusions are unchanged
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AI总结：

本文研究非标准中微子-电子相互作用对大爆炸核合成的影响，比较了BBN与实验对NSI参数的限制，发现两者互补且可测试不同温度下的中微子物理。

摘要：

中微子非标准相互作用（NSI）与电子的相互作用，在许多扩展的粒子物理理论模型中被预测，已知会改变中微子脱离宇宙等离子体的图景。我们更新了之前在存在NSI与电子的情况下中微子脱离的分析，扩展了参数空间，以便首次全面研究其对大爆炸核合成（BBN）期间轻元素产生的影响。我们将BBN对非普遍性和味变化NSI参数的限制与地球实验的约束进行比较。我们的结果表明，BBN的限制比实验限制要宽松得多，但它们是互补的，可以为不同温度尺度和时期中的中微子物理提供测试。

英文摘要：

Neutrino non-standard interactions (NSI) with electrons, predicted in many extended theoretical models of particle physics, are known to alter the picture of neutrino decoupling from the cosmic plasma. We update previous analyses of neutrino decoupling in the presence of NSI with electrons, extending the parameter space and assessing their impact on the primordial light-element abundances produced during Big Bang Nucleosynthesis (BBN). We show that tracking the NSI-induced modifications of the neutrino distributions is necessary to accurately predict the helium-4 abundance, which cannot be derived from a pure $N_{\rm eff}$-driven change. BBN therefore provides additional observables that are complementary to $N_{\rm eff}$. We then derive cosmological constraints on non-universal and flavour-changing NSI parameters, using different dataset combinations, and compare them with bounds from terrestrial experiments. We find that the cosmological limits are significantly less stringent than the terrestrial ones, but they provide an independent probe of neutrino interactions in the early 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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