标量张量引力场中相对论恒星的标量引力波
Scalar gravitational waves from relativistic stars in scalar-tensor gravity
摘要：
与广义相对论不同，标量-张量引力的径向振荡可以激发标量引力波。为了研究标量-张量引力中的标量引力波，我们导出了中子星径向振荡的演化方程，确定了物质振荡和标量引力波的具体振荡频率。模态分析和直接时间演化。因此，我们观察到自发标量化，即使在径向振荡。标量引力波辐射的总能量随背景标量场和耦合常数的变化而变化，其特定振荡频率与物质振荡频率完全相同。也就是说，通过对标量引力波的直接观测，不仅可以揭示引力理论，而且可以提取中子星的径向振荡。
英文摘要：
Unlike general relativity, the scalar gravitational waves can be excited due to the radial oscillations in scalar-tensor gravity. To examine the scalar gravitational waves in scalar-tensor gravity, we derive the evolution equations of the radial oscillations of neutron stars and determine the specific oscillation frequencies of the matter oscillations and scalar gravitational waves, where we adopt two different numerical approaches, i.e., the mode analysis and direct time evolution. As a result, we observe the spontaneous scalarization even in the radial oscillations. Depending on the background scalar field and coupling constant, the total energy radiated by the scalar gravitational waves dramatically changes, where the specific oscillation frequencies are completely same as the matter oscillations. That is, via the direct observations of scalar gravitational waves, one can not only reveal the gravitational theory, but also extract the radial oscillations of neutron stars.
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