论文标题
探测Einstein-Dilaton Gauss-Bonnet重力，并具有引力波的灵感和响声
Probing Einstein-dilaton Gauss-Bonnet Gravity with the inspiral and ringdown of gravitational waves
论文作者
论文摘要
极端重力事件发生的引力波，例如二元系统中两个黑洞的聚结填充了我们可观察到的宇宙，这与它们的基本重力理论相关。一种引人注目的替代性重力理论 - 被弦理论动机的爱因斯坦 - 迪拉顿高斯重力重力 - 描述了直接与曲率较高顺序耦合的附加dilaton标量场的存在，有效地描述了“第五力”相互作用和两个标量辐射之间的标量辐射黑孔之间的“第五力”相互作用。以前的大多数研究都集中在仅考虑对二进制黑洞波形的灵感部分的领先校正。在最近的论文中，我们通过对Inspiral和Ringdown部分的校正以及对残余黑洞的质量和旋转的校正进行了校正，在此弦乐启发的重力中进行了Inspiral-Merger-Ringdown一致性测试，有效期是旋转的二次序列。在这里，我们通过使用完整的Inspiral-Merger-Ringdown波形在理论耦合常数上直接计算界限来扩展分析，而不是分别处理Inspiral和合并部分。我们还考虑了自旋中四分之一的校正，以证明黑洞慢旋转近似的有效性是合理的。我们发现，对波形的准模式校正对于高质量事件（例如GW170729）特别重要，其中Dilaton场的小耦合近似失败而没有任何效果。我们还表明，未来的基于空间和多播级引力波的观察有可能超越理论的现有范围。此处介绍的界限与通过Inspiral-Merger-Ringdown一致性测试中发现的界限可比。
Gravitational waves from extreme gravity events such as the coalescence of two black holes in a binary system fill our observable universe, bearing with them the underlying theory of gravity driving their process. One compelling alternative theory of gravity -- known as Einstein-dilaton Gauss-Bonnet gravity motivated by string theory -- describes the presence of an additional dilaton scalar field coupled directly to higher orders of the curvature, effectively describing a "fifth force" interaction and the emission of scalar dipole radiation between two scalarized black holes. Most previous studies focused on considering only the leading correction to the inspiral portion of the binary black hole waveforms. In our recent paper, we carried out inspiral-merger-ringdown consistency tests in this string-inspired gravity by including corrections to both the inspiral and ringdown portions, as well as those to the mass and spin of remnant black holes, valid to quadratic order in spin. We here extend the analysis by directly computing bounds on the theoretical coupling constant using the full inspiral-merger-ringdown waveform rather than treating the inspiral and merger-ringdown portions separately. We also consider the corrections valid to quartic order in spin to justify the validity of black hole's slow-rotation approximation. We find the quasinormal mode corrections to the waveform to be particularly important for high-mass events such as GW170729, in which the dilaton fields' small-coupling approximation fails without such effects included. We also show that future space-based and multiband gravitational-wave observations have the potential to go beyond existing bounds on the theory. The bounds presented here are comparable to those found in via the inspiral-merger-ringdown consistency tests.
