arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.06633hep-ph
收藏

宇宙学模问题与自然性

The cosmological moduli problem and naturalness

Kyu Jung Bae, Howard Baer, Vernon Barger, Robert Wiley Deal

备注：
73 pages with 15 .png figures; revised version contains added discussion plus 16th figure and added references
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

宇宙学模问题（CMP）分为三个部分：1。潜在的违反BBN约束后期衰减模字段，2。模诱导的引力子问题，其中引力子是过度生产和3。模诱导的最轻超对称粒子（LSP）产生过剩问题。我们研究宇宙学的模量问题及其与电弱自然性的联系。在一般超对称模型中，我们计算了光模场到MSSM粒子和引力子的各种两体衰变宽度。我们包括相空间和混合效应。我们研究的情况下，没有和螺旋抑制模衰减到引力子（情况1和2）和/或gauginos（情况A和B）。对于B1的情况下，我们评估区域的引力子质量m_{3/2}与模质量m_∞参数空间约束的BBN，引力子的过度生产和过度生产的中性子暗物质，以及连接到自然。对于这种情况，基本上所有的参数空间都被排除，除非m_dmax>~2.5 \times 10^3 TeV，其中m_dmax <2 m_{3/2}。对于一个潜在的最有利的情况B2与希格斯玻色子衰变和物质关闭，然后模量分支分数超对称性和引力子成为高度抑制在大m_∞。但是，由于模数密度的增加速度比分支分数的减少速度快，中性伴子暗物质的产生仍然严重过剩。我们还表明，在这种情况下，热产生的引力子问题是固定的巨大的熵稀释，但非热引力子生产的模量衰减仍然是一个巨大的问题，除非它是运动学抑制与m_∞ <2 m_{3/2}。在教学附录中，我们提出了模场两体衰变宽度的详细计算。

英文摘要：

The cosmological moduli problem (CMP) comes in three parts: 1. potential violation of BBN constraints from late decaying moduli fields, 2. the moduli-induced gravitino problem wherein gravitinos are overproduced and 3. the moduli-induced lightest SUSY particle (LSP) overproduction problem. We examine the cosmological moduli problem and its connection to electroweak naturalness. We calculate the various two-body decay widths of a light modulus field into MSSM particles and gravitinos within general supersymmetric models. We include both phase space and mixing effects. We examine cases without and with helicity suppression of modulus decays to gravitinos (cases 1 & 2) and/or gauginos (cases A & B). For case B1, we evaluate regions of gravitino mass m_{3/2} vs. modulus mass m_ϕparameter space constrained by BBN, by overproduction of gravitinos and by overproduction of neutralino dark matter, along with connections to naturalness. For this case, essentially all of parameter space is excluded unless m_ϕ>~ 2.5\times 10^3 TeV with m_ϕ<2m_{3/2}. For a potentially most propitious case B2 with ϕdecay to Higgs and matter turned off, then modulus branching fractions to SUSY and to gravitinos become highly suppressed at large m_ϕ. But since the modulus number density increases faster than the branching fractions decrease, there is still gross overproduction of neutralino dark matter. We also show that in this scenario the thermally produced gravitino problem is fixed by huge entropy dilution, but non-thermal gravitino production from moduli decay remains a huge problem unless it is kinematically suppressed with m_ϕ< 2m_{3/2}. In a pedagogical appendix, we present detailed calculations of modulus field two-body decay widths.

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。

↑