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arXiv 2406.00525hep-ph
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马约拉纳质量产生、引力波与宇宙学张力

Majorana mass generation, gravitational waves and cosmological tensions

Pasquale Di Bari

AI总结:

本文探讨早期宇宙中微子马约拉纳质量产生对宇宙学的影响,提出split seesaw模型能解决原初氘问题、缓解$Λ$CDM模型张力,并产生可探测的原初引力波背景信号。

摘要:

早期宇宙中的中微子马约拉纳质量产生可能在宇宙学可观测量中留下印记。它可以作为可探测的原初引力波随机背景的产生源,其能谱结合了来自一阶相变产生和全局宇宙弦振动的贡献。split seesaw模型提供了一种有趣的可能性。在这种情况下,除了传统的高尺度seesaw外,低尺度的中微子马约拉纳质量产生能够解决潜在的原初氘问题,并缓解$Λ$CDM模型的宇宙学张力。同时,除了超大质量黑洞并合的天体物理主导贡献外,它还能对引力波(GWs)随机背景的NANOGrav信号产生次主导贡献。

英文摘要:

A neutrino Majorana mass generation in the early universe might have left imprints in cosmological observables. It can source the production of a detectable stochastic background of primordial gravitational waves with a spectrum that combines a contribution from a first order phase transition production and from the vibration of global cosmic strings. An intriguing possibility is given by the split seesaw model. In this case, in addition to the traditional high scale seesaw, a low scale neutrino Majorana mass generation can solve a potential primordial deuterium problem and ameliorate the cosmological tensions of the $Λ$CDM model. At the same time, it can also produce subdominant contribution to the NANOGrav signal of a stochastic background of gravitational waves (GWs), in addition to the astrophysical dominant contribution from supermassive black hole mergers.

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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