Title: Self-interacting dipolar boson stars and their dynamics Show Chinese title

Title: 自相互作用偶极玻色子星及其动力学

Abstract: We construct and dynamically evolve dipolar, self-interacting scalar boson stars in a model with sextic (+ quartic) self-interactions. The domain of existence of such dipolar $Q$-stars has a similar structure to that of the fundamental monopolar stars of the same model. For the latter it is structured in a Newtonian plus a relativistic branch, wherein perturbatively stable solutions exist, connected by a middle unstable branch. Our evolutions support similar dynamical properties of the dipolar $Q$-stars that: 1) in the Newtonian and relativistic branches are dynamically robust over time scales longer than those for which dipolar stars without self-interactions are seen to decay; 2) in the middle branch migrate to either the Newtonian or the relativistic branch; 3) beyond the relativistic branch decay to black holes. Overall, these results strengthen the observation, seen in other contexts, that self-interactions can mitigate dynamical instabilities of scalar boson star models. Show Chinese abstract

Abstract: 我们构建并动态演化具有六次方（+四次方）自相互作用的偶极子、自相互作用标量玻色子星。 这种偶极子$Q$-星的存在域结构与同一模型的基本单极子星相似。 对于后者，其结构分为牛顿分支和相对论分支，在其中存在微扰稳定的解，并通过中间不稳定分支连接。 我们的演化结果支持偶极子$Q$-星具有类似的动态特性，即：1）在牛顿分支和相对论分支中，它们在比无自相互作用的偶极子星衰减时间更长的时间尺度上表现出动态稳定性；2）在中间分支中，它们迁移至牛顿分支或相对论分支；3）在相对论分支之外，衰减为黑洞。 总体而言，这些结果加强了在其他背景下观察到的结论，即自相互作用可以缓解标量玻色子星模型的动力学不稳定性。