论文标题
黑洞中子恒星重力波事件对爱因斯坦 - 迪拉顿 - 高斯 - 邦网的限制
Constraints on Einstein-dilaton-Gauss-Bonnet gravity from Black Hole-Neutron Star Gravitational Wave Events
论文作者
论文摘要
最近的引力波观测使我们能够在强和动态场机制中探测重力。在本文中，我们专注于测试由字符串理论激发的爱因斯坦 - 迪拉塔顿高斯重力。特别是，我们使用两个新的中子星黑洞二进制文件（GW200105和GW200115）。我们还考虑GW190814，这与二进制黑洞和中子星黑洞二进制都是一致的。采用牛顿后领先的校正并进行了贝叶斯马尔可夫链蒙特卡洛分析，我们得出了90 \％可信的上限，这是该理论的耦合常数为$ \ sqrt {α__{α_{gb}} \ squrt {α_{gb}} \ selysim 1.33 \，\ rm km $，其一致性是一致的钓鱼。通过结合GWTC-1和GWTC-2目录中选定的二进制黑洞事件，该结合比以前文献中获得的结合更强。我们还通过堆叠GW200105，GW200115，GW190814和选定的Binary Black Black Hole事件，得出了$ \ sqrt {α_{α_{GB}}} \ Lessim 1.18 \，\ rm km $的组合结合。为了检查较高的牛顿后术语的效果的有效性，我们通过映射标量理论到Einstein-Dilaton-Dilaton Gauss-Bonnet Gravity将波形阶段校正至牛顿后第二阶。我们发现，如此高阶的术语分别为GW200105和GW200115分别提高了$ 14.5 \％$的$ 14.5 \％$。
Recent gravitational wave observations allow us to probe gravity in the strong and dynamical field regime. In this paper, we focus on testing Einstein-dilaton Gauss-Bonnet gravity which is motivated by string theory. In particular, we use two new neutron star black hole binaries (GW200105 and GW200115). We also consider GW190814 which is consistent with both a binary black hole and a neutron star black hole binary. Adopting the leading post-Newtonian correction and carrying out a Bayesian Markov-chain Monte Carlo analyses, we derive the 90\% credible upper bound on the coupling constant of the theory as $\sqrt{α_{GB}} \lesssim 1.33\,\rm km$, whose consistency is checked with an independent Fisher analysis. This bound is stronger than the bound obtained in previous literature by combining selected binary black hole events in GWTC-1 and GWTC-2 catalogs. We also derive a combined bound of $\sqrt{α_{GB}} \lesssim 1.18\,\rm km$ by stacking GW200105, GW200115, GW190814, and selected binary black hole events. In order to check the validity of the effect of higher post-Newtonian terms, we derive corrections to the waveform phase up to second post Newtonian order by mapping results in scalar-tensor theories to Einstein-dilaton Gauss-Bonnet gravity. We find that such higher-order terms improve the bounds by $14.5\%$ for GW200105 and $6.9\%$ for GW200115 respectively.
