矮星系大小的单极是暗物质？
Dwarf Galaxy Sized Monopoles as Dark Matter?
摘要：
我们提出了一个暗物质的模型：在一个新的、非常弱耦合的SU（2）规范扇区中的星系大小的“t Hooft-Polyakov磁单极子”，伴随着Higgs场和两种基本费米子。我们通过断言最轻的矮球状（dSph）星系的暗物质晕由单电荷Q=1组成来拟合参数。透镜效应和宽的二进制边界很容易满足，并且单极子及时形成，以帮助CMB波动。在这个模型中，dSph和低表面亮度（LSB）晕自动地具有（1）最小质量-狄拉克量子化解决了丢失卫星的问题，（2）恒定密度的核心（r<r_1），（3）密度与1/r^2成比例的中间区域（r_1<r<r_2）。该模型预言：（A）r_1与恒星自转/色散速度成正比，在r_1<r<r_2时，（B）r_2与Q无关，因此dSph晕至少比它们的半光半径和潮汐半径延伸10倍。（C）最小恒星色散是次小允许值的1/sqrt{2}倍。我们的建议的一个严重的潜在问题是，非BPS单极是排斥的。Jackiw-Rebbi机制产生四种单极子，我们假设，对于汤川耦合的某些选择，一种是轻的，只用于屏蔽另一种的排斥相互作用。
英文摘要：
We propose a model of dark matter: galaxy-sized 't Hooft-Polyakov magnetic monopoles in a new, extraordinarily weakly coupled SU(2) gauge sector with an adjoint Higgs field and two flavors of fundamental fermions. We fit the parameters by asserting that the dark matter halos of the lightest dwarf spheroidal (dSph) galaxies consist of a single charge Q=1 monopole. Lensing and wide binary bounds are then easily satisfied and the monopoles form in time to help with CMB fluctuations. In this model dSph and low surface brightness (LSB) halos automatically have (1) A minimum mass - Dirac quantization solves the missing satellite problem, (2) A constant density core (r<r_1), (3) An intermediate regime (r_1<r<r_2) with density proportional to 1/r^2. The model predicts that (A) r_1 is proportional to the stellar rotational/dispersion velocities at r_1<r<r_2, (B) r_2 is reasonably Q independent and so dSph halos extend at least ten times farther than their half-light and tidal radii, (C) The minimal stellar dispersion is 1/sqrt{2} times the next-smallest allowed value. A serious potential problem with our proposal is that non-BPS monopoles are repulsive. The Jackiw-Rebbi mechanism yields four species of monopoles, and we assume that, for some choice of Yukawa couplings, one species is light and serves only to screen the repulsive interactions of another.
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