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arXiv 2406.03261hep-ph
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通过具有非绝热重子化学势的QCD预热实现重子生成

Baryogenesis via QCD preheating with nonadiabatic baryon chemical potential

Jimin Wang, Xin-Ru Wang, Shinya Matsuzaki

备注：
19 pages, 4 figures; Published on JHEP: https://doi.org/10.1007/JHEP08(2024)032
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AI总结：

本文提出在QCD与暗QCD部门耦合下，通过非绝热QCD sigma介子运动和动态重子化学势触发QCD预热，从而在满足现有实验约束下成功产生宇宙重子数不对称性。

摘要：

如果将QCD与一个展现一阶暗手性相变的暗QCD（dark QCD）部门耦合，在宇宙的热历史中，QCD的手性相变可以被过冷，从而瞬间处于非平衡态。在这种情况下，QCD sigma介子场（作为手性序参量或轻夸克凝聚）开始以非绝热的方式向下滚动至真正的QCD真空。同时，仅在QCD内部即可产生动态重子化学势，它受QCD sigma介子场的动态运动支配，类似于自发重子生成或通过Higgs或类轴子弛豫场景实现的轻子生成。若进一步允许QCD与质量约为1 GeV且具有违反重子数与中子耦合的暗费米子进行交流，非绝热的QCD sigma运动连同非绝热重子化学势便可触发预热并产生重子数不对称性。我们详细讨论了这一场景，发现QCD诱导的动态重子化学势在QCD预热和重子生成中起重要作用，其产生的重子不对称性数量与当今的天体物理、宇宙学及地面实验约束相一致。此外，我们还探讨了该场景特有的宇宙学和唯象学结果。

英文摘要：

The chiral phase transition in QCD can be supercooled in the thermal history of the universe to be instantaneously out-of equilibrium, if QCD is coupled to a dark QCD sector exhibiting the dark chiral phase transition of the first order. In that case the QCD sigma meson field (as the chiral order parameter, or the light quark condensate) starts to roll in a nonadiabatic way down to the true QCD vacuum. Meanwhile a dynamic baryonic chemical potential can be generated solely within QCD, which is governed by the dynamic motion of the QCD sigma meson field, analogously to the spontaneous baryogenesis or the leptogenesis via the Higgs or axionlike relaxation scenario. When QCD is further allowed to communicate with a dark fermion with mass of order of 1 GeV and the baryon number violating coupling to neutron, the nonadiabatic QCD sigma motion along with the nonadiabatic baryon chemical potential can trigger the preheating and produce the baryon number asymmetry. We discuss this scenario in details to find that the QCD-induced dynamic baryon chemical potential plays a significant role for the QCD preheating and the baryogenesis, which yields the desired amount of the asymmetry today consistently with current astrophysical, cosmological, and terrestrial experimental constraints. Cosmological and phenomenological consequences characteristic to the present scenario are also addressed.

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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