Braneworld flux inflation
Braneworld flux inflation
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DOI：
10.1088/1475-7516/2005/08/002
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发表时间：
2005-06
影响因子：
6.4
通讯作者：
S. Kanno;J. Soda;D. Wands
中科院分区：
文献类型：
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作者：
S. Kanno;J. Soda;D. Wands
我们提出了膜膨胀的几何模型，其中膨胀是由相反的膜电荷产生的通量驱动的，并通过膜的碰撞和电荷湮灭而终止。我们假设碰撞过程是完全非弹性的，碰撞后动能转化为热能。此后，这两个膜结合在一起，表现为有效宇宙常数为零的单膜宇宙。在爱因斯坦框架中，四维有效理论在碰撞点处突变。因此，我们的通货膨胀模型本质上必然是五维的。由于碰撞过程在五维引力中不存在奇点，因此我们可以追踪整个宇宙历史中涨落的演化过程。事实证明，射电场波动具有陡峭倾斜的红色光谱，而原初引力波具有平坦的光谱。相反，原始密度扰动可以通过曲率机制产生。
We propose a geometrical model of brane inflation where inflation is driven by the flux generated by opposing brane charges and terminated by the collision of the branes, with charge annihilation. We assume the collision process is completely inelastic and the kinetic energy is transformed into the thermal energy after collision. Thereafter the two branes coalesce together and behave as a single-brane universe with zero effective cosmological constant. In the Einstein frame, the four-dimensional effective theory changes abruptly at the collision point. Therefore, our inflationary model is necessarily five-dimensional in nature. As the collision process has no singularity in five-dimensional gravity, we can follow the evolution of fluctuations during the whole history of the universe. It turns out that the radion field fluctuations have a steeply tilted, red spectrum, while the primordial gravitational waves have a flat spectrum. Instead, primordial density perturbations could be generated by a curvaton mechanism.