标题： 脉冲星的脉冲轮廓在标量-张量引力中 显示英文标题

标题： Pulse profiles from a pulsar in scalar-tensor gravity

摘要： 脉冲轮廓从标量-张量引力理论中的中子星进行了研究，对于几种恒星模型，我们基于极帽模型假设中子星上存在对跖的热点。 然后，我们发现，在标量-张量引力中，标量化的中子星的脉冲轮廓几乎与广义相对论中没有标量场的情况相同，即当两颗恒星的致密度非常相似时。 也就是说，标量场的存在并不直接改变从中子星发出的脉冲轮廓，而恒星的致密度在标量-张量引力中对于确定脉冲形状至关重要。 此外，我们发现，标量化的中子星的脉冲形状或多或少与具有相同质量的广义相对论中的中子星的脉冲形状相似，而脉冲轮廓中最小振幅与最大振幅的比值在标量-张量引力中强烈依赖于耦合常数，这取决于旋转轴和磁轴之间的角度以及旋转轴与观测方向之间的角度。 因此，通过直接观测脉冲轮廓以及对恒星质量的额外观测，可以提取强场区域中引力理论的印记。 显示英文摘要

摘要： The pulse profile from a neutron star in scalar-tensor theory of gravity is examined for several stellar models, where we assume the existence of the antipodal hot spots on the neutron star based on the polar cap model. Then, we find that the pulse profile from the scalarized neutron star in scalar-tensor gravity is almost the same as that in general relativity, i.e., without a scalar field, if the stellar compactness of the both stars is very similar. That is, the existence of the scalar field does not directly change the pulse profile from the neutron star, while the stellar compactness is crucial for determining the pulse shape even in the scalar-tensor gravity. Additionally, we find that the pulse shape from the scalarized neutron star is more or less similar to that from the neutron star with the same mass in general relativity, while the ratio of the minimum amplitude to the maximum amplitude in the pulse profile depend strongly on the coupling constant in scalar-tensor gravity, depending on the angle between the rotational and magnetic axes and the angle between the rotational axis and the direction to the observer. So, the direct observation of the pulse profile together with the additional observation of the stellar mass, one may extract the imprint of the gravitational theory in strong field regime.