Open AccessModeling evolution of dark matter substructure and annihilation boost
Author(s) -
Nagisa Hiroshima,
Shin’ichiro Ando,
Tomoaki Ishiyama
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1468/1/012050
Subject(s) - physics , halo , substructure , dark matter , annihilation , astrophysics , dark matter halo , isotropy , structure formation , particle physics , galaxy , quantum mechanics , structural engineering , engineering
The structure of dark matter halo is hierarchical. Among them, small-scale structures in dark matter halo (so-called subhalos) can enhance dark matter annihilation signals. It is necessary to quantify boost factors by those subhalos to derive the property of dark matter with current/future gamma-ray observations. In order to derive the subhalo boost factors, calculations of halo structure covering more than 20 orders-of-magnitude in the halo mass up to a redshift of z ˜ 10 are required. This is beyond the capability of the current state-of-art cosmological N-body simulation which is a widely-adopted method to study the halo structure. In this talk, I introduce our analytical approach for the formalism of subhalo evolutions and the resultant boost factors. I show that the constraints on the annihilation cross-section obtained by isotropic γ-ray observations can be updated by several factors by taking the contribution from subhalos into account.