Dark matter annihilation via Breit-Wigner enhancement with heavier mediator

被引：0
作者：
Cheng, Yu [1 ,2 ,3 ,4 ]
Ge, Shao-Feng [1 ,2 ,3 ,4 ]
Sheng, Jie [1 ,2 ,3 ,4 ]
Yanagida, Tsutomu T. [1 ,2 ,3 ,4 ]
机构：
[1] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai, Peoples R China
[3] Shanghai Jiao Tong Univ, Key Lab Particle Astrophys & Cosmol, MOE, Shanghai 200240, Peoples R China
[4] Shanghai Jiao Tong Univ, Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
来源：
PHYSICS LETTERS B | 2025年 / 861卷
基金：
中国国家自然科学基金;
关键词：
LARGE-AREA TELESCOPE; ENERGIES;
D O I：
10.1016/j.physletb.2025.139290
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We propose a new scenario that both the dark matter freeze-out in the early Universe and its possible annihilation for indirect detection around a supermassive black hole are enhanced by a Breit-Wigner resonance. With mediator mass larger than the total initial dark matter mass, this annihilation is almost forbidden at late times. Thus, the stringent cosmic microwave background and indirect detection constraints do not apply. However, supermassive black hole can accelerate the dark matter particles to reactivate this resonant annihilation whose subsequent decay to photons leaves a unique signal. The running Fermi-LAT and the future COSI satellites test this scenario.
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页数：7
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