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arXiv 2403.09385hep-phastro-ph.COhep-th
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PeV尺度超对称与来自F-term混合暴胀的宇宙弦

PeV-Scale SUSY and Cosmic Strings from F-term Hybrid Inflation

C. Pallis

AI总结:

本文在B-L扩展MSSM中研究F-term混合暴胀与超对称破缺,产生亚稳宇宙弦解释PTA引力波观测,超对称质量尺度位于PeV区域。

摘要:

我们在MSSM的B-L扩展背景下考虑F-term混合暴胀(FHI)和超对称破缺,该扩展在很大程度上尊重全局U(1)R对称性。隐扇区Kähler流形具有增强的SU(1,1)/U(1)对称性,其标量曲率由无需丑陋调优即可实现超对称破缺的德西特真空所决定。只要涌现的软Tadpole项的幅度限制在(1.2-100)TeV范围内,FHI就被证明与数据一致,并且伴随着B-L宇宙弦的产生。如果这些宇宙弦是亚稳的,它们可以解释目前PTA实验对随机引力波背景的观测,其无量纲张力Gmu~(1-9.2)x10^-8。MSSM的mu参数通过适当调整Giudice-Masiero机制而产生,并促进了R轴子在低于约71GeV的再加热温度下的非平衡衰变。由于延长的物质主导时期,引力波信号在高频处被抑制。超对称质量尺度被发现位于PeV区域。

英文摘要:

We consider F-term hybrid inflation (FHI) and SUSY breaking in the context of a B-L extension of MSSM which largely respects a global U(1) R symmetry. The hidden sector Kaehler manifold enjoys an enhanced SU(1,1)/U(1) symmetry with the scalar curvature determined by the achievement of a SUSY-breaking de Sitter vacuum without ugly tuning. FHI turns out to be consistent with data, provided that the magnitude of the emergent soft tadpole term is confined in the range (1.2-100) TeV, and it is accompanied with the production of B-L cosmic strings. If these are metastable they interpret the present observations from PTA experiments on the stochastic background of gravitational waves with dimensionless tension Gmu~(1-9.2)x10^-8. The mu parameter of MSSM arises by appropriately adapting the Giudice-Masiero mechanism and facilitates the out-of-equilibrium decay of the R saxion at a reheat temperature lower than about 71 GeV. Due to the prolonged matter dominated era the gravitational wave signal is suppressed at high frequencies. The SUSY mass scale turns out to lie in the PeV region.

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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