论文标题
活性银核的嗜血型T通道暗物质的特征
Signatures of leptophilic t-channel dark matter from active galactic nuclei
论文作者
论文摘要
在这项工作中，我们研究了来自Centairus A的嗜血质暗物质（DM）的间接光子特征，据信DM密度尖峰迄今为止幸存下来，与我们的星系相反。我们考虑了DM是Majorana Fermion的模型，该模型通过标量调解人与右手电子相互作用。假设从CEN A的核心测得的光子来自SM过程，我们对平均歼灭横截面的限制受到限制，该截面的数量级比Galactic Center的测量值强7个数量级。着眼于允许的参数空间范围，我们计算了来自AGN射流中辐射DM电子散射的光子的通量和这些光子的圆极化不对称性。我们发现，这种通量比背景低两个数量级，但其圆极化不对称可以达到接近$ 100 \％$的值，这表明需要实验利用圆极化的高分子以检测这些相互作用。 Since the origin of the photons in the GeV-TeV range from Cen A is not completely clear and an exotic origin is compatible with the measurements as well, we also consider the scenario in which synchrotron radiation can only partially explain the photon flux and we fit the excess with signals coming from DM annihilation, finding a best fit for a DM candidate with a mass $m_{\tildeχ}= 123$ GeV and a耦合$ a_r = 0.018 $。
In this work, we study indirect photon signatures of leptophilic dark matter (DM) coming from Centaurus A, where a DM density spike is believed to have survived to date contrary to the case of our galaxy. We consider a model where DM is a Majorana fermion which interacts with right-handed electrons via a scalar mediator. Assuming that the photons measured from the core of Cen A are coming from SM processes, we derive constraints on the average annihilation cross section which are 7 orders of magnitude stronger than the ones from measurements of the Galactic Center. Focusing on the allowed parameter space range, we calculate the flux of photons coming from the radiative DM-electron scattering in the AGN jets and the circular polarisation asymmetry of these photons. We find that this flux is two orders of magnitude lower than the background but its circular polarisation asymmetry can reach values close to $100\%$, indicating the need to experimentally exploit the high fraction of circular polarisation in order to detect these interactions. Since the origin of the photons in the GeV-TeV range from Cen A is not completely clear and an exotic origin is compatible with the measurements as well, we also consider the scenario in which synchrotron radiation can only partially explain the photon flux and we fit the excess with signals coming from DM annihilation, finding a best fit for a DM candidate with a mass $m_{\tildeχ}= 123$ GeV and a coupling $a_R = 0.018$.
