标题： 中子星在单模引力中的潮汐变形性 显示英文标题

标题： Tidal Deformability of Neutron Stars in Unimodular Gravity

摘要： 单模引力是相对于广义相对论的一种修改理论，通过一个额外的条件，即度规的行列式被固定。特别是，如果能量-动量张量不被单独要求守恒，将出现新的几何结构，可能具有观测特征。在本文中，我们在能量-动量张量不守恒的假设下，研究了紧凑星体在单模引力中的潮汐变形。对于多极模型中的中子星，计算了电型和磁型四极潮汐洛夫数。发现随着非守恒参数的增加，电型潮汐洛夫数单调增加，而磁型潮汐洛夫数则减少。与检测到的引力波事件的观测数据相比，较小的负非守恒参数更受青睐。 显示英文摘要

摘要： 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.