论文标题
射电望远镜作为高频引力检测器的潜力
Potential of radio telescopes as high-frequency gravitational wave detectors
论文作者
论文摘要
在存在磁场的情况下，重力波被转化为光子，反之亦然。我们证明了这种转换导致宇宙微波背景（CMB）的变形，该宇宙微波背景可以用作MHz对GHz引力波源的检测器，然后再进行回报。射电望远镜边缘的测量值可以作为重力波振幅上的结合，$ h_c <10^{ - 21}（10^{ - 12}）$在78 MHz处，对于当前天体和宇宙学约束允许的最强（最弱）宇宙磁场。同样，Arcade 2的结果表示$ H_C <10^{ - 24}（10^{ - 14}）$ $ 3-30 $ GHz。对于最强的磁场，这些约束超过了当前的实验室约束，约有七个数量级。可以想象，未来21厘米天文学的进步将这些界限推向了宇宙学限制对重力波的总能量密度的敏感性。
In the presence of magnetic fields, gravitational waves are converted into photons and vice versa. We demonstrate that this conversion leads to a distortion of the cosmic microwave background (CMB), which can serve as a detector for MHz to GHz gravitational wave sources active before reionization. The measurements of the radio telescope EDGES can be cast as a bound on the gravitational wave amplitude, $h_c < 10^{-21} (10^{-12})$ at 78 MHz, for the strongest (weakest) cosmic magnetic fields allowed by current astrophysical and cosmological constraints. Similarly, the results of ARCADE 2 imply $h_c < 10^{-24} (10^{-14})$ at $3 - 30$ GHz. For the strongest magnetic fields, these constraints exceed current laboratory constraints by about seven orders of magnitude. Future advances in 21cm astronomy may conceivably push these bounds below the sensitivity of cosmological constraints on the total energy density of gravitational waves.
