學年
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111 |
學期
|
1 |
出版(發表)日期
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2022-08-18 |
作品名稱
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Self-interacting dark scalar spikes around black holes via relativistic Bondi accretion |
作品名稱(其他語言)
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著者
|
Wei-Xiang Feng; Alessandro Parisi; Chian-Shu Chen; Feng-Li Lin |
單位
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出版者
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著錄名稱、卷期、頁數
|
Journal of Cosmology and Astroparticle Physics 2022 |
摘要
|
We consider the spike mass density profile in a dark halo by self-consistently solving the relativistic Bondi accretion of dark matter onto a non-spining black hole of mass M. We assume that the dominant component of the dark matter in the halo is a Standard model gauge-singlet scalar. Its mass m ≃ 10-5 eV and quartic self-coupling λ ≲ 1019 are constrained to be compatible with the properties of galactic dark halos. In the hydrodynamic limit, we find that the accretion rate is bounded from below, Mmin = 96πG2M2m4/λħ3. Therefore, for M = 106 M⊙ we have Mmin ≃ 1.41 × 10-9 M⊙ yr-1, which is subdominant compared to the Eddington accretion of baryons. The spike density profile ρ0(r) within the self-gravitating regime cannot be fitted well by a single-power law but a double-power one. Despite that, we can fit ρ0(r) piecewise and find that ρ0(r) ∝ r-1.20 near the sound horizon, ρ0(r) ∝ r-1.00 towards the Bondi radius and ρ0(r) ∝ r-1.08 for the region in between. This contrasts with more cuspy ρ0(r) ∝ r-1.75 for dark matter with Coulomb-like self-interaction. |
關鍵字
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accretion; astrophysical fluid dynamics; dark matter theory; massive black holes |
語言
|
en |
ISSN
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1475-7516 |
期刊性質
|
國外 |
收錄於
|
SCI
|
產學合作
|
國外
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通訊作者
|
Chian-Shu Chen and Feng-Li Lin |
審稿制度
|
是 |
國別
|
GBR |
公開徵稿
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出版型式
|
,電子版 |