Recent gravitational wave observation based on the data from GW150914 has confirmed Hawking’s area theorem and estimated the increase in total horizon area during a merger process of two Kerr black holes. We use this result and the validity of the second law to obtain the first observational bound on the 4D topological Gauss-Bonnet coupling as $\gamma \lesssim 2.804_{-1.169}^{+7.946}\times {10}^9{\mathrm{m}}^2$ with 95% credibility.

中文翻译：

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从 GW150914 约束拓扑 Gauss-Bonnet 耦合

最近基于 GW150914 数据的引力波观测证实了霍金面积定理，并估计了两个克尔黑洞合并过程中总视界面积的增加。我们使用这个结果和第二定律的有效性来获得 4D 拓扑 Gauss-Bonnet 耦合的第一个观测界为$\gamma \lesssim 2.804_{-1.169}^{+7.946}\times {10}^9{\mathrm{米}}^2$95%的可信度。