Search for anisotropic, birefringent spacetime-symmetry breaking in gravitational wave propagation from GWTC-3
Search for anisotropic, birefringent spacetime-symmetry breaking in gravitational wave propagation from GWTC-3
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DOI：
10.1103/physrevd.107.064031
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发表时间：
2022-10
影响因子：
5
通讯作者：
L. Haegel;K. O’Neal-Ault;Q. Bailey;J. Tasson;M. Bloom;Lijing Shao
中科院分区：
文献类型：
--
作者：
L. Haegel;K. O’Neal-Ault;Q. Bailey;J. Tasson;M. Bloom;Lijing Shao
利用一个有效的场论框架--标准模型扩展，研究了引力波传播过程中洛伦兹效应和CPT破坏效应的存在。我们实现了一个修正的引力波色散方程，它包括各向同性、各向异性和双折射色散。利用LIGO-Virgo-KAGRA算法库，我们对时空对称性破缺的源参数和系数进行了联合贝叶斯推断。从GWTC-3星表中选取的45个高置信度事件的样本中，当各向异性系数为零时，我们得到了各向同性系数$k(V)00}^{(5)}$在90 CI时的最大值为3.19×10^-15$m。所有色散参数的综合测量得出16$k{(V)ij}^{(5)}$系数的极限值在$10^-13$m量级。我们通过比较不同波形模型得到的约束条件来研究我们的推论的稳健性，发现模拟波形中的物理缺失可能表现为时空对称性破缺引起的事件子集的色散。
An effective field theory framework, the Standard-Model Extension, is used to investigate the existence of Lorentz and CPT-violating effects during gravitational wave propagation. We implement a modified equation for the dispersion of gravitational waves, that includes isotropic, anisotropic and birefringent dispersion. Using the LIGO-Virgo-KAGRA algorithm library suite, we perform a joint Bayesian inference of the source parameters and coefficients for spacetime symmetry breaking. From a sample of 45 high confidence events selected in the GWTC-3 catalog, we obtain a maximal bound of $3.19 \times 10^{-15}$~m at 90\% CI for the isotropic coefficient $k_{(V)00}^{(5)}$ when assuming the anisotropic coefficients to be zero. The combined measurement of all the dispersion parameters yields limits on the order of $10^{-13}$~m for the 16 $k_{(V)ij}^{(5)}$ coefficients. We study the robustness of our inference by comparing the constraints obtained with different waveform models, and find that a lack of physics in the simulated waveform may appear as spacetime symmetry breaking-induced dispersion for a subset of events.