Fermion production during and after axion inflation
Fermion production during and after axion inflation
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轴子膨胀期间和之后的费米子产生
DOI：
10.1088/1475-7516/2015/11/021
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发表时间：
2015
影响因子：
6.4
通讯作者：
E. Sfakianakis
中科院分区：
文献类型：
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作者：
Peter Adshead;E. Sfakianakis
我们研究了在轴子驱动的暴胀，特别是m 2 2和monodromy暴胀中的衍生耦合费米子，并计算了暴胀时期和后暴胀轴子振荡期间的粒子产生。在暴胀期间，滚动的轴子充当螺旋性的有效化学势，使一个费米子螺旋性的引力产生偏向于另一个。这种机制允许有效的引力产生重费米子状态，否则将被高度抑制。在暴胀之后，由于费米子场的有效频率发生非线性变化，轴子振荡并产生具有两种螺旋度的费米子。对于费米子质量和轴子-费米子耦合强度的某些值，两个螺旋度状态是不对称产生的，导致左螺旋度费米子和右螺旋度费米子的数量密度不相等。
We study derivatively coupled fermions in axion-driven inflation, specifically mϕ2ϕ2 and monodromy inflation, and calculate particle production during the inflationary epoch and the post-inflationary axion oscillations. During inflation, the rolling axion acts as an effective chemical potential for helicity which biases the gravitational production of one fermion helicity over the other. This mechanism allows for efficient gravitational production of heavy fermion states that would otherwise be highly suppressed. Following inflation, the axion oscillates and fermions with both helicities are produced as the effective frequency of the fermion field changes non-adiabatically. For certain values of the fermion mass and axion-fermion coupling strength, the two helicity states are produced asymmetrically, resulting in unequal number-densities of left- and right-helicity fermions.
DOI：
10.1016/j.physrep.2010.05.002
发表时间：
2008-12
期刊：
Physics Reports
影响因子：
--
作者：
H. Dreiner;H. Haber;S. P. Martin
通讯作者：
H. Dreiner;H. Haber;S. P. Martin