发表机构
University of Cambridge（剑桥大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过非线性演化与坍缩模拟，检验孤子玻色星的径向稳定性，发现径向稳定模型无非径向不稳定性，但并非经引力冷却形成，且可形成具持久径向振荡的非静态致密天体。
AI 中文摘要
我们扩展了先前关于孤子玻色星径向稳定性的研究，通过非球对称扰动对其进行非线性演化，并研究其由标量云坍缩形成的过程。我们特别关注先前被识别为径向稳定的模型，尽管它们具有正束缚能，而正束缚能通常意味着所有标量物质的弥散在能量上更为有利。对3+1演化的模式分析未发现任何径向稳定模型（包括具有正束缚能的模型）中存在非径向不稳定性的证据。然而，我们确实发现此类模型并非通常通过引力冷却形成。我们还发现有可能形成另一种致密天体，其经历持久的径向振荡，因此不能描述为静态玻色星。我们认为，这些天体可能以爱因斯坦-克莱因-戈登方程的能量上有利的多振荡解为特征，这些解存在于参数空间的某些区域。
英文摘要
We extend a previous study of the radial stability of solitonic boson stars by nonlinearly evolving them under aspherical perturbations, and by studying their formation from the collapse of scalar clouds. We focus in particular on models previously identified as radially stable, despite having positive binding energy, which ordinarily suggests that dispersion of all scalar matter is energetically preferred. A mode analysis of our 3+1 evolutions produces no evidence for the presence of a non-radial instability in any radially stable model, including those with positive binding energy. However, we do find evidence that such models do not generically form via gravitational cooling. We also find that it is possible to form another kind of compact object, which undergoes long-lasting radial oscillations and hence cannot be described as a stationary boson star. These objects may be characterized, we suggest, by energetically favoured multi-oscillating solutions to the Einstein-Klein-Gordon equations, present in certain regions of the parameter space.
Comments14 pages, 8 figures
