Gravitational fermion production in inflationary cosmology
Gravitational fermion production in inflationary cosmology
复制标题
暴涨宇宙学中引力费米子的产生
DOI：
10.1016/j.physletb.2012.04.066
复制
发表时间：
2011
影响因子：
4.4
通讯作者：
P. Zhou
中科院分区：
文献类型：
--
作者：
D. Chung;L. Everett;H. Yoo;P. Zhou
我们重新审视暴胀宇宙学中大质量狄拉克费米子的引力产生，重点是澄清大质量和小质量体系中粒子数密度的解析计算。对于引力产生的费米子的质量与膨胀结束时的哈勃膨胀率相比很小的情况，我们得到了一个几乎与膨胀模型的细节无关的数密度的普遍结果。结果是相同的情况下，共形耦合标量的整体乘法因子的秩序单位的原因，而不仅仅是计数的费米自由度。
We revisit the gravitational production of massive Dirac fermions in inflationary cosmology with a focus on clarifying the analytic computation of the particle number density in both the large and the small mass regimes. For the case in which the masses of the gravitationally produced fermions are small compared to the Hubble expansion rate at the end of inflation, we obtain a universal result for the number density that is nearly independent of the details of the inflationary model. The result is identical to the case of conformally coupled scalars up to an overall multiplicative factor of order unity for reasons other than just counting the fermionic degrees of freedom.