Black hole production in tachyonic preheating
Black hole production in tachyonic preheating
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DOI：
10.1088/1475-7516/2006/04/001
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发表时间：
2006-01
影响因子：
6.4
通讯作者：
T. Suyama;Takahiro Tanaka;B. Bassett;H. Kudoh
中科院分区：
文献类型：
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作者：
T. Suyama;Takahiro Tanaka;B. Bassett;H. Kudoh
我们提出了一个自相互作用标量场在早期宇宙经历速子预热的完全非线性模拟。我们发现被速子不稳定性放大的亚视界尺度上的密度扰动即使在随后的参数共振期间也保持了长距离的相关性，这与由参数共振主导的预热标准模型的预测相反。结果，最终的光谱表现出记忆性，在形状上不是通用的。我们发现在随后的参数共振时代，宇宙的状态方程几乎是尘埃状的；因此，金斯波长比视界尺度小得多。如果我们的二维模拟是三维情况的准确反映，那么由于黑洞的过度产生，参数空间的广大区域被排除在外。然而，与COBE/WMAP归一化相一致的实际参数值很可能在这个黑洞生产过剩区域之外。
We present fully non-linear simulations of a self-interacting scalar field in the early universe undergoing tachyonic preheating. We find that density perturbations on subhorizon scales which are amplified by tachyonic instability maintain long range correlations even during the succeeding parametric resonance, in contrast to the predictions from the standard models of preheating dominated by parametric resonance. As a result the final spectrum exhibits memory and is not universal in shape. We find that throughout the subsequent era of parametric resonance the equation of state of the universe is almost dust-like; hence the Jeans wavelength is much smaller than the horizon scale. If our 2D simulations are accurate reflections of the situation in 3D, then there are wide regions of parameter space ruled out by overproduction of black holes. It is likely however that realistic parameter values, consistent with COBE/WMAP normalization, are safely outside this black hole overproduction region.