论文标题
通过伪量表量耦合进行重力诱导的重新归一化
Renormalization in gravitational leptogenesis with pseudo-scalar-tensor coupling
论文作者
论文摘要
我们考虑带有重力Chern-Simons项的伪量表膨胀模型中的重新归一化。在该模型中，就有通过重力手性异常而产生的手性重力波产生的Lepton不对称性。但是，众所周知，重力Chern-Pontryagin密度的预期值以及所得的Lepton数量密度取决于UV-Cutoff量表，这引起了其有效性的问题。在本文中，我们提出了一种将Chern-Pontryagin密度的期望值重新归一化以消除UV-Cutoff依赖性的方法。当我们采用最小的减法方案和重力瘦素发生方案的可行性时，我们还讨论了重新归一化的Lepton数量密度。
We consider the renormalization in the pseudo-scalar inflation models with the gravitational Chern-Simons term. In this model, lepton asymmetry is generated from the chiral gravitational waves produced due to the Chern-Simons term through the gravitational chiral anomaly. However, it is known that the naive estimate of the expectation value of the gravitational Chern-Pontryagin density as well as the resultant lepton number density depend on the UV-cutoff scale, which raises a question on their validity. In this paper, we propose a way to renormalize the expectation value of the Chern-Pontryagin density to remove the UV-cutoff dependence. We also discuss the renormalized lepton number density when we adopt the minimal subtraction scheme and the viability of the gravitational leptogenesis scenario.
