论文标题
Baryon-Dark物质相互作用对IgM温度和TSZ效应与磁场的影响
Implications of baryon-dark matter interaction on IGM temperature and tSZ effect with magnetic field
论文作者
论文摘要
我们表明，宇宙磁场的综合效应以及巴里子与暗物质之间可能的非标准相互作用对热的Sunyaev $ - $ zel $ {'} $ dovich（tsz）效应，取决于温度和实层介质的电离状态。由于它们之间的相对速度和它们的温度差异导致重子和暗物质之间的阻力，导致这两个物种之间的传热。同时，双极扩散和衰减的磁性湍流倾向于加热重子。这两个过程的这种相互作用导致宇宙的热和电离状态的不同进化史，因此通过TSZ效应在小尺度上影响CMB频谱。在这项工作中，我们计算了CMB温度，电离部分和Y参数的演变，以实现磁场的不同强度和相互作用的横截面。我们注意到，$σ_0= 10^{ - 42} $ M $^{2} $（磁场强度为$ 3.0 $ ng）的交互横截面可将Y参数降低，而与磁场的强度相似，但在Baryons和Dark Matter之间没有如此相互作用。
We show that the combined effect of cosmic magnetic field and a possible non-standard interaction between baryons and dark matter has interesting consequences on the thermal Sunyaev$-$Zel${'}$dovich (tSZ) effect depending on the temperature and the ionization state of the intergalactic medium. The drag force between the baryons and dark matter due to the relative velocity between them, and their temperature difference results in heat transfer between these two species. At the same time the ambipolar diffusion and the decaying magnetic turbulence tends to heat up the baryons. This interplay of these two processes give rise to different evolution histories of the thermal and ionization state of the universe and hence influences the CMB spectrum at small scales through the tSZ effect. In this work, we have computed the evolution of the temperature, ionization fraction and the y-parameter of the CMB for different strengths of the magnetic field and the interaction cross-section. We note that an interaction cross-section of $σ_0=10^{-42}$ m$^{2}$ (with a magnetic field strength of $3.0$ nG) reduces the y-parameter by an order of magnitude as compared to the case with similar strength of magnetic field but where there is no such interaction between the baryons and dark matter.
