Title: DW-genesis: generating the baryon number from domain walls Show Chinese title

Title: DW-创世：从畴壁生成重子数

Abstract: We show that axionic domain walls, when they couple to the lepton number, can generate a net baryon and lepton number through the mechanism of spontaneous baryogenesis. We study systematically the baryon asymmetry produced by these domain walls (DWs) at annihilation, and refer to this process as DW-genesis. We find that the baryon number is maximised when the DW network collapses approximately at the moment when the $L$-violating interaction decouples. We explore the expected gravitational wave signal from the DW network annihilation and the prospects for detecting it, but conclude that successful DW-genesis is typically in tension with observable GW signal. Morever, we briefly discuss a possible suppression induced by the cancellation between the asymmetry created by "opposite" axionic domain walls attached to the string. Show Chinese abstract

Abstract: 我们证明，当轴子壁与轻子数耦合时，可以通过自发玻色生成机制产生净的重子数和轻子数。我们系统地研究了这些域壁（DWs）在湮灭过程中产生的重子不对称性，并将这一过程称为DW生成。我们发现，当DW网络大约在$L$-破坏相互作用脱离平衡的时候崩塌时，重子数达到最大值。我们探索了由DW网络湮灭产生的引力波信号以及探测它的前景，但得出结论，成功的DW生成通常与可观察到的引力波信号相矛盾。此外，我们简要讨论了由附着在弦上的“相反”轴子壁所创造的不对称性之间的抵消可能引起的抑制。