论文标题
产生充气结构的PBH
Production of PBHs from inflaton structure
论文作者
论文摘要
在大爆炸核合成之前，如果在重新加热过程中以快速振荡的充气场主导，则宇宙可能显示出原始结构的形成周期。在这种情况下，我们假设了一种原始黑洞形成的新机制[L. E. Padilla，J。C。Hidalgo和K. A. Malik，物理。修订版D，第1卷。 106，p。 023519，7月2022年]，绘制了扩展加热时代与标量场暗物质模型之间的类比，并规定了Aftraton Halos和Aftraton Star的重力崩溃。在本文中，我们研究了实现这种新机制的要求。我们表明，在小尺度上具有峰值的通用原始功率谱最适合生产相当数量的PBH。当满足此类要求时，如果重新加热持续足够长的时间，则可以产生$ M _ {\ rm pbh} \ sim 1〜 \ mathrm {gram} $的大量PBH。我们特别发现，PBHS的质量分数比PBHS通过直接崩溃而在以辐射或无压力灰尘为主的宇宙中直接塌陷中获得的数量级大。研究了我们的发现的可观察到的含义，我们探讨了PBHS组件在重新加热结束后某个时候可能主导宇宙的能量密度的可能性。
At times prior to Big Bang Nucleosynthesis, the universe could show a primordial structure formation period if dominated by a fast oscillating inflaton field during reheating. In this context, we have postulated a new mechanism of primordial black hole formation [L. E. Padilla, J. C. Hidalgo, and K. A. Malik, Phys. Rev. D, vol. 106, p. 023519, Jul 2022], that draws the analogy between an extended reheating era and the scalar field dark matter model, stipulating the gravitational collapse of inflaton halos and inflaton stars. In this paper we look at the requirements for the realization of this new mechanism. We show that a generic primordial power spectrum with a peak at small scales is most suitable for the production of a considerable number of PBHs. When such requirement is met, and if reheating lasts long enough, large populations of PBHs with $M_{\rm PBH}\sim 1~\mathrm{gram}$ may be produced. We find in particular, that the mass fraction of PBHs is orders of magnitude larger than that obtained when PBHs form via direct collapse in a universe dominated by radiation or pressure-less dust. Looking at observable implications of our findings, we explore the possibility that the PBHs component may dominate the energy density of the universe at some point after the end of reheating.
