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arXiv 2202.06216hep-phgr-qc
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用引力子暗物质和非热轻子生成对宇宙弦引力波谱的无标度暴胀约束

Constraining the Cosmic Strings Gravitational Wave Spectra in No Scale Inflation with Viable Gravitino Dark matter and Non Thermal Leptogenesis

Waqas Ahmed, M. Junaid, Salah Nasri, Umer Zubair

摘要:

在无标度背景下,我们重新审视了由最小超对称标准模型(MSSM)的$U(1)_{B-L}$扩展度量的混合暴胀模型。考虑到一个单一的预测框架,我们研究暴胀,leptogenesis,gavitino宇宙学,和随机背景的引力波产生的亚稳宇宙弦。在暴胀结束时,$U(1)_{B-L}$的自发破缺产生了一个亚稳态宇宙弦网络,而$U(1)_{B-L}$ Higgs场与中微子的相互作用则使右手中微子产生了较大的Majorana质量.沉重的马约拉纳质量解释了微小的中微子质量通过跷跷板机制,一个现实的情况下,再加热和非热leptogenesis。我们表明,一个成功的非热leptogenesis和稳定的引力子作为一个暗物质候选人可以实现广泛的再加热温度和$U(1)_{B-L}$对称性破缺标度。简要讨论了在大统一理论(GUT)体系中实现亚稳态宇宙弦的可能性。我们发现,一个成功的再加热与非热leptogenesis和引力子暗物质限制弦张力的允许值到一个狭窄的范围$10^{-9} \lesssim Gμ_{CS} \lesssim 8 \times 10^{-6}$,预测随机引力波背景,位于最近NANOGrav 12.5年的数据的1- $σ$界限内,以及未来GW实验的灵敏度范围内。

英文摘要:

We revisit the hybrid inflation model gauged by $U(1)_{B-L}$ extension of the Minimal Supersymmetric Standard Model (MSSM) in a no-scale background. Considering a single predictive framework, we study inflation, leptogenesis, gavitino cosmology, and the stochastic background of gravitational waves produced by metastable cosmic strings. The spontaneous breaking of $U(1)_{B-L}$ at the end of inflation produces a network of metastable cosmic strings while, the interaction between $U(1)_{B-L}$ Higgs field and the neutrinos generate heavy Majorana masses for the right-handed neutrinos. The heavy Majorana masses explain the tiny neutrino masses via the seesaw mechanism, a realistic scenario for reheating and non-thermal leptogenesis. We show that a successful non-thermal leptogenesis and a stable gravitino as a dark matter candidate can be achieved for a wide range of reheating temperatures and $U(1)_{B-L}$ symmetry breaking scales. The possibility of realizing metastable cosmic strings in a grand unified theory (GUT) setup is briefly discussed. We find that a successful reheating with non-thermal leptogenesis and gravitino dark matter restrict the allowed values of string tension to a narrow range $10^{-9} \lesssim Gμ_{CS} \lesssim 8 \times 10^{-6}$, predicting a stochastic gravitational-wave background that lies within the 1-$σ$ bounds of the recent NANOGrav 12.5-yr data, as well as within the sensitivity bounds of future GW experiments.

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