标题： 大质量标量张量理论中的双中子星并合：准平衡状态和标量化的动态增强 显示英文标题

标题： Binary neutron star mergers in massive scalar-tensor theory: Quasi-equilibrium states and dynamical enhancement of the scalarization

摘要： 我们研究了在Damour-Esposito-Farese型标量-张量引力理论框架下双中子星的准平衡序列，特别关注中子星在远距离轨道上已经自发标量化的案例，即高耦合常数的情况。 尽管当分离距离$a$是由标量质量定义的康普顿尺度的$\gtrsim 3$-$6$倍时，标量效应被大大抑制，但我们表明，两个中子星的标量场之间的相互作用会在$a \lesssim 3$-$6$倍的康普顿尺度处产生一个围绕双星的标量云，这以牺牲轨道能量为代价。 这使我们能够通过检查由于这种现象引起的去相位，从双中子星合并的引力波观测中对标量质量$m_\phi$进行约束。 特别是事件GW170817暗示了一个$m_\phi \gtrsim 10^{-11}$电子伏特的约束，如果该系统中的中子星已经自发标量化，则耦合强度应较弱。 显示英文摘要

摘要： We study quasi-equilibrium sequences of binary neutron stars in the framework of Damour-Esposito-Farese-type scalar-tensor theory of gravity with a massive scalar field, paying particular attention to the case where neutron stars are already spontaneously scalarized at distant orbits, i.e., in the high coupling constant case. Although scalar effects are largely quenched when the separation $a$ is $\gtrsim 3$--$6$ times of the Compton length-scale that is defined by the scalar mass, we show that the interaction between the scalar fields of the two neutron stars generates a scalar cloud surrounding the binary at the price of orbital energy when $a \lesssim 3$--$6$ times of the Compton length-scale. This enables us to constrain the scalar mass $m_\phi$ from gravitational-wave observations of binary neutron star mergers by inspecting the dephasing due to such phenomenon. In particular, the event GW170817 is suggestive of a constraint of $m_\phi \gtrsim 10^{-11}$ eV and the coupling strength should be mild if the neutron stars in this system were spontaneously scalarized.