Primordial black holes are again on the limelight
Primordial black holes are again on the limelight
复制标题
原始黑洞再次成为人们关注的焦点
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
R. Turolla
中科院分区：
文献类型：
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作者：
M. Roncadelli;A. Treves;R. Turolla
我们得出了一个关于宇宙中仍然存在的原始黑洞（PBH）数量的强上限。银河系恒星在其形成和随后的吸积过程中对PBH的引力捕获将导致盘星的急剧消耗，特别是白色矮星，除非PBH的平均宇宙密度和质量受到严格限制。我们的发现还有助于区分PBH的各种产生机制。此外，我们表明，一个星星成为overlightning消失前的PBH的时间跨度独立于其质量，从而提供了一个特征的观测签名所考虑的情况。我们强调，我们的结果允许存在恒星质量的黑洞在质量范围内，这是禁止标准恒星演化。
We derive a strong upper bound on the amount of Primordial Black Holes (PBHs) that can still be present in the Universe. Gravitational capture of PBHs by the Milky Way stars during their formation and subsequent accretion would produce a dramatic depletion of disk stars and especially of white dwarfs, unless the average cosmic density and mass of PBHs are severely constrained. Our finding also helps to discriminate among the various production mechanisms of PBHs. Moreover, we show that a star becomes overluminous before its disappearance into a PBH for a time span independent of its mass, thereby providing a characteristic observational signature of the considered scenario. We stress that our result allows for the existence of stellar-mass black holes in a mass range that is forbidden by standard stellar evolution.