论文标题
GWTC-3中二进制黑洞的方向
The orientations of the binary black holes in GWTC-3
论文作者
论文摘要
预计引力波（GW）源的轨道平面是各向同性分布的。但是，物理和技术因素（例如，双重重力，目录污染和搜索算法限制）都可能导致推断非异分分布。因此，表明轨道取向的推断天体物理分布确实是各向同性的，因此可以用来排除某些违反一般相对性的行为，作为对GW目录样品纯度的无效测试，并且作为检查选择效果的检查是否适当地考虑了。我们在其最新分析中增加了Ligo-Virgo-Kagra协作使用的默认质量/旋转/红移模型，以测量轨道取向的天体物理分布。我们表明，GWTC-3中的69个二元黑洞与具有随机轨道取向一致。推断的分布在$π/2 $附近高度对称，偏斜$ \ mathcal {s} _ {\ rm {post}} = 0.01^{+0.17} _ { - 0.17} $。同时，与预期的各向同性分布相比，推断分布的中位数的詹森 - 香农发散为$ 1.4 \ times 10^{ - 4} $。
It is expected that the orbital planes of gravitational-wave (GW) sources are isotropically distributed. However, both physical and technical factors, such as alternate theories of gravity with birefringence, catalog contamination, and search algorithm limitations, could result in inferring a non-isotropic distribution. Showing that the inferred astrophysical distribution of the orbital orientations is indeed isotropic can thus be used to rule out some violations of general relativity, as a null test about the purity of the GW catalog sample, and as a check that selection effects are being properly accounted for. We augment the default mass/spins/redshift model used by the LIGO-Virgo-KAGRA Collaboration in their most recent analysis to also measure the astrophysical distribution of orbital orientations. We show that the 69 binary black holes in GWTC-3 are consistent with having random orbital orientations. The inferred distribution is highly symmetric around $π/2$, with skewness $\mathcal{S}_{\rm{post}}=0.01^{+0.17}_{-0.17}$. Meanwhile, the median of the inferred distribution has a Jensen-Shannon divergence of $1.4\times 10^{-4}$ bits when compared to the expected isotropic distribution.
