Dark sector production and baryogenesis from not quite black holes

• 作者: Ufuk Aydemir Jing Ren
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: PARTICLE AND NUCLEAR ASTROPHYSICS AND COSMOLOGY
• 页码范围: 305-324
• 页数: 20页
• 语种: 英文
• DOI: 10.1088/1674-1137/abf9ff

摘要

Primordial black holes have been considered attractive dark matter candidates,whereas some of the pre-dictions rely heavily on the near-horizon physics that remains to be tested experimentally.As a concrete alternative,thermal 2-2-holes closely resemble black holes without event horizons.Being a probable endpoint of gravitational collapse,they provide a solution to the information loss problem but also naturally result in stable remnants.Previ-ously,we have considered primordial 2-2-hole remnants as dark matter.Owing to the strong constraints from a nov-el phenomenon associated with remnant mergers,only small remnants with mass approximate to the Planck mass can constitute all dark matter.In this paper,we examine the scenario in which the majority of dark matter consists of particles produced by the evaporation of primordial 2-2-holes,whereas the remnant contribution is secondary.The products with sufficiently light mass may contribute to the number of relativistic degrees of freedom in the early uni-verse,which we also calculate.Moreover,2-2-hole evaporation can produce particles that are responsible for the ba-ryon asymmetry.We observe that baryogenesis through direct B-violating decays or through leptogenesis can both be realized.Overall,the viable parameter space for the Planck remnant scenario is similar to that of primordial black holes with Planck remnants.However,heavier remnants result in different predictions,and the viable parameter space remains large even when the remnant abundance is small.