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Asymmetric dark matter and sommerfeld enhancement

Communications in Theoretical Physics 2024年第8期76卷 120-125页

作者： Sujuan Qiu Hoernisa Iminniyaz Wensheng Huo School of Physics Science and Technology Xinjiang University

We study the relic density of asymmetric dark matter with long-range interactions by considering the sommerfeld effect. We find that the annihilation cross section of asymmetric dark matter is enhanced by the sommerfeld effect and thus the relic density is decreased. Then we use the Planck data to constrain the asymmetry factor, coupling, and to derive the upper bounds on the dark matter mass in s-wave and p-wave annihilation cases.

关键词： asymmetric dark matter relic density sommerfeld enhancement

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Relic density of asymmetric Dark Matter with sommerfeld enhancement

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Chinese Physics C 2021年第1期45卷 315-324页

作者： Aihemaitijiang Abudurusuli Hoemisa Iminniyaz School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China

We investigate the evolution of abundance of the asymmetric thermal Dark Matter when its annihilation rate at chemical decoupling is boosted by the sommerfeld ***,we discuss the effect of kinetic decoupling on the relic abundance of asymmetric Dark Matter when the interaction rate depends on ***,the relic den sity of asymmetric Dark Matter is analyzed in the frame of chemical *** deed,after decoupling from chemical equilibrium,asymmetric Dark Matter particles and anti-particles are still in kinetic equilibrium for a *** has no effect for the case of 5-wave annihilation since there is no temperature dependenee in this ***,kinetic decoupling has impacts for the case of p-wave annihilation and sommerfeld enhanced s-and p-wave *** investigate in detail the extent to which kinetic decoupling affects the relic abundanee of asymmetric Dark Matter particles and *** find the constraints on the cross section and asymmetry factor using observational data of the relic density of Dark Matter.

关键词： asymmetric Dark Matter sommerfeld enhancement kinetic decoupling relic density

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Explaining DAMPE results by dark matter with hierarchical lepton-specific Yukawa interactions

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Chinese Physics C 2018年第3期42卷 87-93页

作者：柳国丽王飞王雯宇杨金民 School of Physics Zhengzhou University CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences College of Applied Science Beijing University of Technology School of Physics University of Chinese Academy of Sciences Department of Physics Tohoku University

We propose to interpret the DAMPE electron excess at 1.5 TeV through scalar or Dirac fermion dark matter （DM） annihilation with doubly charged scalar mediators that have lepton-specific Yukawa couplings. The hierarchy of such lepton-specific Yukawa couplings is generated through the Froggatt-Nielsen mechanism, so that the dark matter annihilation products can be dominantly electrons. Stringent constraints from LEP2 on intermediate vector boson production can be evaded in our scenarios. In the case of scalar DM, we discuss one scenario with DM annihilating directly to leptons and another scenario with DM annihilating to scalar mediators followed by their decays. We also discuss the Breit-Wigner resonant enhancement and the sommerfeld enhancement in the case where the s-wave annihilation process is small or helicity-suppressed. With both types of enhancement, constraints on the parameters can be relaxed and new ways for model building can be opened in explaining the DAMPE results.

关键词： DAMPE dark matter Froggatt-Nielsen mechanism sommerfeld enhancement

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