Soliton merger rates and enhanced axion dark matter decay
Soliton merger rates and enhanced axion dark matter decay
复制标题
DOI：
10.1103/physrevd.109.043019
复制
发表时间：
2023-01
影响因子：
5
通讯作者：
X. Du;D. Marsh;M. Escudero;A. Benson;D. Blas;Charis Kaur Pooni;M. Fairbairn
中科院分区：
文献类型：
--
作者：
X. Du;D. Marsh;M. Escudero;A. Benson;D. Blas;Charis Kaur Pooni;M. Fairbairn
在模拟由玻色场组成的暗物质晕中观察到孤子的形成。我们采用扩展的Press-Scheck hter形式来计算孤子的质量函数，假定晕质量和孤子质量之间的关系有不同的形式。我们进一步给出了孤子大合并速率的新的计算方法。由轴子Dm组成的孤子在临界质量以上是不稳定的，并且衰变为相对论性轴子或光子，这取决于耦合常数的值。我们使用计算的孤子主要合并率来预测由于孤子不稳定性而增强的DM衰减率。对于目前允许的轴子参数的某些值，从孤子衰变到光子向星际介质注入的能量相当于或大于由于核心坍塌超新星在10美元处注入的能量。一篇配套的论文探讨了这种能量注入的现象学。
Solitons are observed to form in simulations of dark matter (DM) halos consisting of bosonic fields. We use the extended Press-Schechter formalism to compute the mass function of solitons, assuming various forms for the relationship between halo mass and soliton mass. We further provide a new calculation of the rate of soliton major mergers. Solitons composed of axion DM are unstable above a critical mass, and decay to either relativistic axions or photons, depending on the values of the coupling constants. We use the computed soliton major merger rate to predict the enhanced DM decay rate due to soliton instability. For certain values of currently allowed axion parameters, the energy injection into the intergalactic medium from soliton decays to photons is comparable to or larger than the energy injection due to core collapse supernovae at $z>10$. A companion paper explores the phenomenology of such an energy injection.