具有体黏性及宇宙粒子创造的引力重子生成
Sign-Locked Gravitational Baryogenesis from Bulk Viscosity and Cosmological Particle Creation
AI总结：
通过体黏性变形产生确定性曲率源，利用热力学不可逆性避免冻结取消，实现重子不对称性生成，且在当前宇宙学限制内可复现观测到的重子不对称性。
摘要：
我们研究了一种具体的引力重子生成实现，其中早期宇宙的微小体黏性变形生成确定性曲率源。关键点是热力学不可逆性：正熵生产使驱动项单调递增，从而避免冻结取消对快速振荡或符号变化源的抑制。受简单的一阶转移函数诊断启发，我们分析标准曲率电流算符$\mathcal{L}_{\rm int}=(c/M^2)\,\partial_μR\,J^μ_{B-L}$在近辐射背景中，有效压力$p_{\rm eff}=p-3ζH$和$ζ=ξρ/H$。对于$ξ>0$，发现$R\neq 0$，$\dot R>0$，以及重子不对称性$η\propto ξT_D^5/(M^2 \bar M_{\rm Pl}^3)$。我们推导了可行的$(T_D,M,ξ)$区域，包括有限黏性时期熵稀释，并展示观测到的$η_{\rm obs}\simeq 8.6\times10^{-11}$可以在与当前宇宙学限制一致的参数区域内复现，同时保持有效场论控制。最高尺度基准应考虑到当前张量限制下的极高再加热尺度。粒子创造部分的重子尺度场提供对所需范围$ξ\sim10^{-4}$--$10^{-3}$的现象学动机。我们还讨论了引力重子生成的已知高导数不稳定性以及稳定或完成嵌套的作用。
英文摘要：
We study a concrete realization of gravitational baryogenesis in which a small bulk-viscous deformation of an otherwise radiation-dominated early universe generates a sign-definite curvature source. The key point is thermodynamic irreversibility: positive entropy production makes the driving term monotonic and therefore avoids the freeze-out cancellation that suppresses rapidly oscillating or sign-changing sources. Motivated by a simple first-order transfer-function diagnostic, we analyze the standard curvature-current operator $\mathcal{L}_{\rm int}=(c/M^2)\,\partial_μR\,J^μ_{B-L}$ in a near-radiation background with effective pressure $p_{\rm eff}=p-3ζH$ and $ζ=ξρ/H$. For $ξ>0$ one finds $R\neq 0$, $\dot R>0$, and a baryon asymmetry $η\propto ξT_D^5/(M^2 \bar M_{\rm Pl}^3)$. We derive the viable $(T_D,M,ξ)$ region, include entropy dilution from a finite viscous epoch, and show that the observed $η_{\rm obs}\simeq 8.6\times10^{-11}$ can be reproduced in a parameter region consistent with current cosmological bounds while maintaining EFT control. The highest-scale benchmarks should be read conditionally on a very high reheating scale in view of current tensor limits. A particle-creation sector of heavy GUT-scale fields then provides a phenomenological motivation for the required range $ξ\sim10^{-4}$--$10^{-3}$. We also discuss the known higher-derivative instability of gravitational baryogenesis and the role of stabilized or completed embeddings.
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