Fermion production during preheating after hybrid inflation
Fermion production during preheating after hybrid inflation
复制标题
混合膨胀后预热过程中费米子的产生
DOI：
10.1088/1126-6708/2000/02/034
复制
发表时间：
2000
影响因子：
5.4
通讯作者：
E. Roulet
中科院分区：
文献类型：
--
作者：
J. García;S. Mollerach;E. Roulet
在暴胀结束时，暴胀场的相干振荡可能会共振放大与其耦合的玻色子和费米子的长波长模式。我们在混合膨胀模型中研究了预热过程中两种粒子的共振产生。暴胀后暴胀场和希格斯场的相干时间演化会导致费米子产生截然不同的结果，具体取决于它们是与希格斯场耦合还是与暴胀场耦合。对于模型参数的合理值，通过参数共振产生费米子可以非常有效。我们研究了混合模型预热过程中费米子和玻色子能量密度的相对增长。在预热的初始阶段，费米子的产生主导了相对能量密度，而玻色子模式的指数增长很快占据了主导地位。
At the end of inflation, the coherent oscillations of the inflaton field may resonantly amplify the long wavelength modes of both bosons and fermions coupled to it. We study the resonant production of both kinds of particles during preheating in a model of hybrid inflation. The coherent time evolution of the inflaton and the Higgs fields after inflation induce a very different production of fermions depending on whether they are coupled to the Higgs or to the inflaton. For reasonable values of the model parameters, the fermion production through parametric resonance can be very efficient. We study the relative growth of the fermion and boson energy densities during preheating in hybrid models. During the initial stage of preheating, fermion production dominates the relative energy density, while the exponential growth of bosonic modes soon takes over.