论文标题
中子恒星在非模块性重力中的潮汐变形性
Tidal Deformability of Neutron Stars in Unimodular Gravity
论文作者
论文摘要
单型重力是关于一般相对性的一种修改理论，即固定了公制的决定因素。特别是，如果不能分别施加能量量张量，则出现新的几何结构，并具有潜在的观察性特征。在本文中，我们研究了在非保守的能量弹药张量的假设下，紧凑型恒星在单型重力中的潮汐变形性。电力型和磁性四极型潮汐爱数都是针对具有多质trope模型的中子恒星计算的。发现电型潮汐爱数在单调上增加，但是随着非保疗参数的增加，磁性型潮汐型爱情数量正在减少。与检测到的重力波事件的观察数据相比，有利于较小的负非保存参数。
Unimodular gravity is a modified theory with respect to general relativity by an extra condition that the determinant of the metric is fixed. Especially, if the energy-momentum tensor is not imposed to be conserved separately, a new geometric structure appears with potentially observational signatures. In this paper, we study tidal deformability of compact star in the unimodular gravity under the assumption of non-conserved energy-momentum tensor. Both the electric-type and magnetic-type quadrupole tidal Love numbers are calculated for neutron stars with polytrope model. It is found that the electric-type tidal Love numbers are monotonically increasing, but the magnetic-type ones are decreasing, with the increase of the non-conservation parameter. Compared with the observational data from detected gravitational-wave events, a small negative non-conservation parameter is favored.
