BianchiⅠ型宇宙中矢量暴涨理论相关问题的研究

Study on Vector Inflation in Bianchi TypeⅠCosmology

通过矢量暴涨理论,研究了与之相关的问题,特别是粒子生成对慢滚过程、相图以及各向异性的影响.计算结果表明,粒子生成对标量场的影响使得相图上出现一个峰,峰的方向不受初始条件和质量改变的影响.而对于矢量场,情况则不同,粒子生成对应的峰其方向会改变,这与质量的变化有关.相应地,体系的各向异性也会随之增强或减弱.各向异性的程度不仅决定于慢滚过程,还决定于慢滚后的粒子生成过程.粒子生成可以成为宇宙各向同性化的原因.

Some aspects of vector inflation have been studied, especially that of the particle production effects on the slow-roll, phase diagram and anisotropy. It is shown that there is a peak on the phase diagram of the scalar field due to particle production, and the direction of the peak is independent of the initial conditions and mass variation. While as to the case of vector field, the direction of the peak depends on the value of mass. Correspond- ingly, the anisotropy of the system is promoted or suppressed. The degree of the anisotropy is related not only to slow-roll, but to the particle production process after slow-roll. Both aspects should be taken into account.