标题： 使用高斯过程在引力波瞬变目录3中搜索额外的偏振态 显示英文标题

标题： A search for extra polarisations using a Gaussian process in Gravitational-Wave Transient Catalogue 3

摘要： 广义相对论预测引力波由两种偏振态描述：加号$+$态和交叉$\times$态。 然而，其他引力理论允许多达六种偏振态。 我们使用引力波零流，这是三个或更多探测器的线性组合，在这种组合中，$+$和$\times$信号相加为零，留下噪声和可能的非标准偏振态的引力波。 我们开发了一个高斯过程模型来搜索广义相对论之外的额外偏振态。 利用LIGO-Virgo-KAGRA第三引力波瞬变目录中的42个三探测器事件的数据，我们没有发现非标准偏振态的证据。 我们设定了引力波应变的分数偏差上限，对于事件GW190602_175927，在90%可信度下低至0.39。 显示英文摘要

摘要： General relativity predicts that gravitational waves are described by two polarisation states: the plus $+$ state and cross $\times$ state. However, alternate theories of gravity allow up to six polarisations. We employ the gravitational-wave null stream, a linear combination of three or more detectors where the $+$ and $\times$ signals add to zero, leaving behind noise and potentially gravitational waves in non-standard polarisation states. We develop a Gaussian process model to search for extra polarisations beyond general relativity. Using data from 42 three-detector events from LIGO-Virgo-KAGRA's Third Gravitational-Wave Transient Catalogue, we find no evidence of non-standard polarisations. We set upper limits on the fractional deviation in gravitational-wave strain to be as low as 0.39 at 90% credibility for the event GW190602_175927.