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arXiv 1502.01124astro-ph.COgr-qchep-ph
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作为有偏示踪剂的原始黑洞

Primordial black holes as biased tracers

Yuichiro Tada, Shuichiro Yokoyama

摘要:

原初黑洞(PBH)是理论上的黑洞,它可能在辐射占优时期形成,基本上是由辐射过密度的引力坍缩引起的。众所周知,在我们宇宙结构形成的背景下,这种坍缩的物体,例如,晕/星系,可以被认为是潜在的物质波动的偏差示踪剂和晕/星系偏差已经研究得很好。采用一个峰值-背景分裂图像,这是一个有用的工具来讨论的晕偏差,我们认为大规模的聚团行为的PBH和提出一个几乎质量无关的约束的情况下,暗物质(DM)组成的PBH。我们考虑的情况下,统计的原始曲率扰动几乎是高斯,但与小的本地型非高斯。如果PBH解释了DM的丰度,那么这种大尺度的PBH成团只是物质等曲率扰动的结果,并受到宇宙微波背景(CMB)观测的严格约束。从这个约束,我们表明,在一定的单一领域的情况下,既造成CMB温度扰动和PBH的形成,PBH-DM的情况下,被排除,即使有相当小的本地型非高斯,$|f_\mathrm{NL}|\sim\mathcal{O}(0.01)$,而我们给的约束参数的情况下,PBH的源场是不同的CMB扰动。

英文摘要:

Primordial black holes (PBHs) are theoretical black holes which may be formed during the radiation dominant era and, basically, caused by the gravitational collapse of radiational overdensities. It has been well known that in the context of the structure formation in our Universe such collapsed objects, e.g., halos/galaxies, could be considered as bias tracers of underlying matter fluctuations and the halo/galaxy bias has been studied well. Employing a peak-background split picture which is known to be a useful tool to discuss the halo bias, we consider the large scale clustering behavior of the PBH and propose an almost mass-independent constraint to the scenario that dark matters (DMs) consist of PBHs. We consider the case where the statistics of the primordial curvature perturbations is almost Gaussian, but with small local-type non-Gaussianity. If PBHs account for the DM abundance, such a large scale clustering of PBHs behaves as nothing but the matter isocurvature perturbation and constrained strictly by the observations of cosmic microwave backgrounds (CMB). From this constraint, we show that, in the case a certain single field causes both CMB temperature perturbations and PBH formations, the PBH-DM scenario is excluded even with quite small local-type non-Gaussianity, $|f_\mathrm{NL}|\sim\mathcal{O}(0.01)$, while we give the constraints to parameters in the case where the source field of PBHs is different from CMB perturbations.

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