论文标题
爱因斯坦 - 斯卡尔 - 高斯 - 邦网中的二进制中子星合并
Binary neutron star mergers in Einstein-scalar-Gauss-Bonnet gravity
论文作者
论文摘要
相对于其他已知的天体物理通道，二进制中子恒星合并可能导致黑洞较少，与更大的紧凑型物体二进制文件相比，在较小的曲率尺度下产生的一般相对性有可能探测一般相对论。作为此类代表性的例子，我们在这里研究了使用完整的非扰动进化方程的演化，在移动对称的爱因斯坦 - 斯卡尔 - 高斯 - 高斯重力中进行了二进制中子星。我们发现，即使在修饰的重力耦合的巨大值下，对灵感的影响也很小（正如预期的，因为中子星在该理论中没有标量电荷）。但是，邮递员可能会产生强大的标量效应，包括辐射。当形成黑洞时，它会产生标量电荷，从而影响环down重力波信号。如果寿命较长的恒星持续存在后，我们发现标量辐射的恒星源水平的振荡与黑洞形成案例相似。在残留恒星中，我们进一步发现，在耦合值中，与存在同一质量的黑洞溶液的最大值相当，标量场中存在明显的非线性增强，如果足够大会导致进化的崩溃，则似乎是由于基础方程的损失造成的。
Binary neutron star mergers, which can lead to less massive black holes relative to other known astrophysical channels, have the potential to probe modifications to general relativity that arise at smaller curvature scales compared to more massive compact object binaries. As a representative example of this, here we study binary neutron star mergers in shift-symmetric Einstein-scalar-Gauss-Bonnet gravity using evolutions of the full, nonperturbative evolution equations. We find that the impact on the inspiral is small, even at large values of the modified gravity coupling (as expected, as neutron stars do not have scalar charge in this theory). However, postmerger there can be strong scalar effects, including radiation. When a black hole forms, it develops scalar charge, impacting the ringdown gravitational wave signal. In cases where a longer-lived remnant star persists postmerger, we find that the oscillations of the star source levels of scalar radiation similar to the black hole formation cases. In remnant stars, we further find that at coupling values comparable to the maximum value for which black hole solutions of the same mass exist, there is significant nonlinear enhancement in the scalar field, which if sufficiently large leads to a breakdown in the evolution, seemingly due to loss of hyperbolicity of the underlying equations.
