Shin'ichirou Yoshida
We study r-mode instability of rotating compact objects composed of asymmetric and self-interacting Fermionic dark matter (dark stars). It is argued that the instability limit the angular frequency of the stars less than half of the Keplerian frequency. This may constrain the stars as alternatives to fast spinning pulsars or rapidly rotating Kerr black holes.
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Influence of Fermionic Dark Matter on the Structural and Tidal Properties of Neutron Stars
研究理想费米气体暗物质对中子星可观测性质的影响，通过约束参数空间发现暗物质积累量必须较小以满足当前天体物理限制。
We consider an extension of the standard model in which a singlet fermionic particle, to serve as cold dark matter, and a singlet Higgs are added. We perform a reanalysis on the free parameters. In particular, demanding a correct relic abundance of dark matter, we derive and plot the coupling of the singlet fermion with the singlet Higgs, $g_s$, versus the dark matter mass. We analytically compute the pair annihilation cross section of singlet fermionic dark matter into two photons. The thermally averaged of this cross section is calculated for wide range of energies and plotted versus dark ma…
Strange Stars within Bosonic and Fermionic Admixed Dark Matter
本文研究了玻色子和费米子混合暗物质对奇异夸克星宏观性质的影响，发现暗物质的质量、类型和占比会显著改变星体的最大质量、半径及无量纲潮汐参数。
The direct limit of electric dipole moment (EDM) and direct search for dark matter by EDM interaction are considered as including the electromagnetic nuclear form factor, in case that the dark matter candidate is a Dirac particle. The WIMP electric dipole moment constrained by direct searches must be lower than 7*10^(-22)e cm for WIMP mass of 100 GeV to satisfy the current experimental exclusion limits at XENON10 and CDMS II. We also consider the CP violation of EDM and the WIMP discovery by EDM intereaction in the future.
Constraining Fermionic Dark Matter with Galactic Neutron Stars
本文针对费米子暗物质，考虑中子星银盘运动及暗物质自湮灭有无两种情形，结合银河系脉冲星观测数据约束暗物质质量与暗物质-核子散射截面等性质。
Strange magnetars admixed with fermionic dark matter
本文利用双流体TOV方程研究了强磁场下混入费米子暗物质的奇异星，发现磁场会减弱暗物质增加引起的最大质量下降，而潮汐形变受影响最显著。
We study an impact of asymmetric fermionic dark matter on neutron star properties, including tidal deformability, mass, radius, etc. We present the conditions at which dark matter particles tend to form a compact structure in a core of the star or create an extended halo around it. We show that compact core of dark matter leads to a decrease of the total gravitational mass and tidal deformability compared to a pure baryonic star, while presence of a dark matter halo increases those observable quantities. By imposing an existing astrophysical and gravitational wave constraints set by LIGO/Virgo…
Dark Matter constitutes most of the matter in the presently accepted cosmological model for our Universe. The extreme conditions of ordinary baryonic matter, namely high density and compactness, in Neutron Stars make these objects suitable to gravitationally accrete such a massive component provided interaction strength between both, luminous and dark sectors, at current experimental level of sensitivity. We consider several different DM phenomenological models from the myriad of those presently allowed. In this contribution we review astrophysical aspects of interest in the interplay of ordin…
We construct a radiative inverse seesaw model with local B-L symmetry, and investigate the flavor structure of the lepton sector and the fermionic Dark Matter. Neutrino masses are radiatively generated through a kind of inverse seesaw framework. The PMNS matrix is derived from each mixing matrix of the neutrino and charged lepton sector with large Dirac CP phase. We show that the annihilation processes via the interactions with Higgses which are independent on the lepton flavor violation, have to be dominant in order to satisfy the observed relic abundance by WMAP. The new interactions with Hi…
Effects of light-mass fermionic dark matter on the equilibrium and stability of white dwarfs
本研究在双流体广义相对论框架下研究含费米子暗物质的白矮星，发现其更致密（质量约1.3太阳质量，半径约500公里），径向振荡基模变化约20%，可产生可探测的引力波频移，为约束暗物质特性提供新途径。
In this work we study the constraints on the dark matter interaction with the standard model particles, from the observations of dark matter relic density, the direct detection experiments of CDMS and XENON, and the indirect detection of the antiproton-to-proton ratio by PAMELA. A model independent way is adopted in the study by constructing the effective interaction operators between dark matter and standard model particles. The most general 4-fermion operators are investigated. We find that the constraints from different observations are complementary with each other. Especially the spin ind…
From Capture to Collapse: Revisiting Black Hole formation by Fermionic Asymmetric Dark Matter in Neutron Stars
研究通过重新审视费米子非对称暗物质在中子星中的捕获与坍缩过程，探讨其对黑洞形成的影响，并改进相关物理过程的分析。
Constraining exotic compact stars composed of bosonic and fermionic dark matter with gravitational wave events
本研究利用LIGO-Virgo探测的三起引力波事件，分析了不同类型暗物质致密星的参数约束能力，明确了暗物质粒子质量标度及自束缚星真空能的相关限制。
Analyzing Fermionic Dark Matter scenarios with anomalous compact objects
本文通过分析三个异常致密天体的可能暗物质含量，探讨其作为暗物质混合中子星的可能性，利用基于原理的正子方程状态消除模型依赖性，得出两颗天体可能由小比例费米暗物质构成，另一颗则成为双星候选。
Cosmic ray signals from dipole-interacting dark matter annihilation are considered in the positron, antiproton and photon channels. The predicted signals in the positron channel could nicely account for the excess of positron fraction from Fermi LAT, PAMELA, HEAT and AMS-01 experiments for the dark matter mass larger than 100 GeV with a boost (enhancement) factor of 30-80. No excess of antiproton over proton ratio at the experiments also gives a severe restriction for this scenario. With the boost factors, the predicted signals from Galactic halo and signals as mono-energetic gamma-ray lines (…
Constraining self-interacting fermionic dark matter in admixed neutron stars using multimessenger astronomy
本文通过多信使天文观测约束混合中子星中的自相互作用费米子暗物质参数，首次结合质量、半径、潮汐形变及宇宙学截面限制，确定了允许的 $g$-$y$ 参数区域。
A long time ago (in 2014), in galaxies and galaxy clusters far, far away, several groups have reported hints for a yet unidentified line in astrophysical X-ray signals at an energy of 3.5\,keV. While it is not unlikely that this line is simply a reflection of imperfectly modeled atomic transitions, it has renewed the community's interest in models of keV-scale dark matter, whose decay would lead to such a line. The alternative possibility of dark matter annihilation into monochromatic photons is far less explored, a lapse that we strive to amend in this paper. More precisely, we introduce a no…
Compact stars consisting of massless quark matter and fermionic dark matter are studied by solving the Tolman-Oppenheimer-Volkoff equations for two fluids separately. Dark matter is further investigated by incorporating inter-fermionic interactions among the dark matter particles. The properties of stars made of quark matter particles and self-interacting and free dark matter particles are explored by obtaining their mass-radius relations. The regions of stability for such a compact star are determined and it is demonstrated that the maximum stable total mass of such a star decreases approxima…
A neutral Dirac fermion is supplied as a singlet within the context of the standard model (SM) and is considered as a dark matter (DM) candidate near electroweak scale (10-1000 GeV) with nonzero magnetic dipole moment. The Dirac particles have four different types of electromagnetic couplings (four form factors) in general. We predict that the candidate mainly interacts with SM particles through magnetic dipole moment (MDM), since MDM conserves the discrete symmetries like parity (P), time reversal (T), and charge conjugation (C) or its combination CP. The magnetic dipole moment constrained by…
Quantum Gravity Effects on Fermionic Dark Matter and Gravitational Waves
本文将量子引力破坏离散整体对称性的情景扩展至费米子暗物质，利用中微子混合的间接探测约束QG尺度，并通过畴壁湮灭解释脉冲星计时阵列观测到的引力波背景。
We study the structural properties like the gravitational mass, radius and tidal deformability of dark matter (DM) admixed strange quark stars (SQSs). For the purpose we consider the vector MIT Bag model to describe the strange quark matter (SQM) and investigate the possible presence of accreted DM in the SQSs consequently forming DM admixed SQSs. We introduce feeble interaction between SQM and the accreted fermionic DM via a vector dark boson mediator. Considering the present literature, in the context of possible presence of DM in SQSs, this work is the first to consider interaction between …
Scrutinizing Fermionic Dark Matter in Scotogenic Model with Low Reheating Temperature
本文研究了Scotogenic模型中费米子暗物质在低再加热温度下的现象，探讨了其对暗物质丰度的影响及未来实验对参数空间的探测能力。
Exploring robust correlations between fermionic dark matter model parameters and neutron star properties: A two-fluid perspective
本研究基于双流体方法和多种相对论平均场状态方程，探索了费米子暗物质模型参数与中子星性质的相关性，发现核物质EOS不确定性会削弱该相关性，但暗物质存在下C-Love关系依然成立。
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