发表机构
Quaid-i-Azam University; Islamic University of Madinah（奎德·阿扎姆大学; 麦地那伊斯兰大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
在R对称翻转SU(5)大统一理论中实现Sneutrino三混合暴胀，结合ACT DR6和Planck数据确定可行参数区域，实现可观测的张量标量比及重子不对称性生成。
AI 中文摘要
我们在R对称翻转SU(5)大统一理论中构建了Sneutrino三混合暴胀的实现方案。一对矢量型物质多重态10_V+overline{10}_V提供了沿右手Sneutrino分量的D平坦暴胀子方向，额外的Z_2对称性禁止了直接的暴胀子质量项，因此主导的暴胀相互作用是不可重整的Kähler驱动算符。与以往研究不同，我们将超势截断尺度M_s视为与约化Planck质量m_P无关的量，这极大地扩大了可行参数空间。将该模型与ACT DR6/Planck给出的n_s=0.9734±0.0034以及谱指数跑动的2σ界限进行对比，我们确定了广泛的可行参数区域，其中翻转SU(5)对称破缺尺度可接近常规大统一尺度M≃M_{GUT}，且张量标量比可达到可观测值r≳10^{-3}，这在即将开展的LiteBIRD和CMB-S4等CMB B模实验的探测范围内。我们进一步研究了暴胀后动力学，将暴胀子识别为常规I型 seesaw 区域中最轻的右手Sneutrino，其非平衡衰变产生轻子不对称性，该不对称性通过非热轻子生成和电弱 sphalerons 转化为观测到的重子不对称性，对应的重加热温度与成功的轻子生成及引力微子约束均一致。
英文摘要
We construct a realization of sneutrino tribrid inflation within the $R$-symmetric flipped $SU(5)$ grand unified theory. A vector-like pair of matter multiplets, $10_V+\overline{10}_V$, provides a $D$-flat inflaton direction along the right-handed sneutrino component, with an additional $Z_2$ symmetry forbidding a direct inflaton mass term so that the leading inflationary interaction is a non-renormalizable Kähler-driven operator. Unlike previous studies, we treat the superpotential cutoff scale $M_s$ as independent of the reduced Planck mass, $m_P$, substantially enlarging the viable parameter space. Confronting the model with the ACT DR6/Planck determination $n_s=0.9734\pm0.0034$ and the $2σ$ bound on the running of the spectral index, we identify broad regions of viable parameter space in which the flipped $SU(5)$ symmetry-breaking scale can approach the conventional GUT scale, $M\simeq M_{\rm GUT}$, and the tensor-to-scalar ratio can reach observable values, $r\gtrsim10^{-3}$, within reach of forthcoming CMB $B$-mode experiment such as LiteBIRD. We further study the post-inflationary dynamics, identifying the inflaton with the lightest right-handed sneutrino in a conventional type-I seesaw sector, whose out-of-equilibrium decay generates a lepton asymmetry that is converted into the observed baryon asymmetry via non-thermal leptogenesis and electroweak sphalerons, for a reheating temperature consistent with both successful leptogenesis and the gravitino constraint.
Comments18 pages, 8 figures, and 1 table. A few minor revisions have been made; the conclusions remain unchanged
