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arXiv 2302.04302astro-ph.COhep-ph
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多场超轻类轴子暗物质的模拟

Simulations of multi-field ultralight axion-like dark matter

Noah Glennon, Nathan Musoke, Chanda Prescod-Weinstein

AI总结:

本研究修改UltraDark.jl代码,首次开展含自相互作用与场间相互作用的双场超轻类轴子暗物质三维模拟,探究了孤子动力学及不同种类孤子碰撞的特性,揭示了多成分、有相互作用情形与单场无相互作用情形的差异。

摘要:

随着对超轻类轴子粒子(ALPs)的约束愈发严格,包含多种超轻ALP的模型正受到越来越多的关注。我们开展了双ALP模型的模拟研究,所用粒子的质量处于目前被认可的合理质量范围[arXiv:1307.1705]内。我们修改后的代码UltraDark.jl不仅支持模拟多种具有不同质量的超轻ALP,还能设置不同的自相互作用与场间相互作用,这让我们得以首次开展包含自相互作用和场间相互作用的双场ALP三维模拟。模拟结果显示,与单场、无相互作用的情形相比,多粒子种类与相互作用的引入会带来不同的现象学效应。我们重点探究了孤子的动力学特性:与单种和/或无相互作用的超轻ALP相比,有相互作用的多成分超轻暗物质具有不同的平衡密度分布。正如早期研究[arXiv:2011.09510]所观测到的,吸引相互作用会使密度分布收缩,而排斥相互作用则会使密度分布延展。我们还研究了由不同轴子种类构成的孤子之间的碰撞,观测到此类碰撞中不存在干涉图样,且碰撞后的最终密度取决于ALP的相对质量及其相互作用。

英文摘要:

As constraints on ultralight axion-like particles (ALPs) tighten, models with multiple species of ultralight ALP are of increasing interest. We perform simulations of two-ALP models with particles in the currently supported range [arXiv:1307.1705] of plausible masses. The code we modified, UltraDark.jl, not only allows for multiple species of ultralight ALP with different masses, but also different self-interactions and inter-field interactions. This allows us to perform the first three-dimensional simulations of two-field ALPs with self-interactions and inter-field interactions. Our simulations show that having multiple species and interactions introduces different phenomenological effects as compared to a single field, non-interacting scenarios. In particular, we explore the dynamics of solitons. Interacting multi-species ultralight dark matter has different equilibrium density profiles as compared to single-species and/or non-interacting ultralight ALPs. As seen in earlier work [arXiv:2011.09510], attractive interactions tend to contract the density profile while repulsive interactions spread out the density profile. We also explore collisions between solitons comprised of distinct axion species. We observe a lack of interference patterns in such collisions, and that resulting densities depend on the relative masses of the ALPs and their interactions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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