标题： $φ$- 轴子星在无质量标量-张量理论中的模式 显示英文标题

标题： $φ$-modes of neutron stars in a massless scalar-tensor theory

摘要： 标量-张量理论允许中子星存在丰富的准正则模态。 标量场的存在允许极化单极和偶极辐射，以及由标量场引发的其他高阶多极模态。 在这里，我们展示了标量主导的最低多极的$\phi$模态，$l=0$、1 和 2 对于无质量的标量-张量理论，该理论受$R^2$理论的启发，并与广义相对论中最小耦合标量场的模态进行比较。 我们考虑了一组六个现实的状态方程，并提取了这些模态的普遍关系。 显示英文摘要

摘要： Scalar-tensor theories allow for a rich spectrum of quasinormal modes of neutron stars. The presence of the scalar field allows for polar monopole and dipole radiation, as well as for additional higher multipole modes led by the scalar field. Here we present these scalar-led $\phi$-modes for the lowest multipoles, $l=0$, 1 and 2 for a massless scalar-tensor theory of the Brans-Dicke type, motivated by $R^2$ theory, and compare with those of a minimally coupled scalar field in general relativity. We consider a set of six realistic equations of state and extract universal relations for the modes.