论文标题
由中子星的近区域中的重量波段产生的光子
Photons generated by gravitional waves in the near-zone of a neutron star
论文作者
论文摘要
当引力波或重力通过电或磁性背景传播时，它可以以某种概率转换为光子。在本文中，在中子恒星的近区域中的Minkowski时空和弯曲的时空中，偶极磁场都被认为是这种背景。在前一种情况下，我们发现重力垂直行进而不是平行于背景磁场，可以更有效地转换为电磁辐射场。在后一种情况下，我们关注的是沿着中子恒星附近的径向方向行进的情况。中子恒星的半径约为十公里，因此具有长波长或低频的重力波可以通过衍射绕过中子星。对于高频引力波，转换概率与距离正方形成正比，而距离正方形则是静态电或磁性背景情况。偶极场和中子恒星北极之间的倾斜角越小，磁振幅越大。描述弯曲时空的术语将稍微增强这种概率。我们估计该值大约是$ \ sim 10^{ - 14} -10^{ - 10} $的顺序。因此，可以期望这种转换过程可能有可能打开观察高频引力波的窗口。
When a gravitational wave or a graviton travels through an electric or magnetic background, it could convert into a photon with some probability. In this paper, a dipole magnetic field is considered as this kind of background in both the Minkowski spacetime and the curved spacetime in the near-zone of a neutron star. In the former case, we find that the graviton traveling vertically rather than parallel to the background magnetic field could be more effectively converted into an electromagnetic radiation field. In the latter case, we focus on the situation, in which the graviton travels along the radial direction near a neutron star. The radius of a neutron star is about ten kilometers, so the gravitational wave with long wavelength or low frequency may bypass neutron stars by diffraction. For high frequency gravitational wave, the conversion probability is proportional to the distance square as that in the static electric or magnetic background case. The smaller the inclination angle between the dipole field and the neutron star north pole is, the larger magnetic amplitude will be. The term that described curved spacetime will slightly enhance this kind of probability. We estimate that this value is about the order of $\sim 10^{-14}- 10^{-10}$. Therefore, it is expectable that this kind of conversion process may have a potential to open a window for observing high frequency gravitational waves.
