arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1804.04722astro-ph.HEastro-ph.IM
收藏

利用光学和近红外蟹状脉冲检验弱等效原理

Testing the Weak Equivalence Principle using Optical and Near-Infrared Crab Pulses

Calvin Leung, Beili Hu, Sophia Harris, Amy Brown, Hien Nguyen, Jason Gallicchio

摘要:

弱等效原理指出,测试粒子在引力场中的测地线与粒子的构成无关。为了限制弱等效原理的违反,我们使用一米望远镜在洛杉矶附近的桌山天文台监测的相对到达时间的脉冲从蟹状星云脉冲星在光学($λ\approx 585$ nm)和近红外($λ\approx 814$ nm)使用的仪器,检测单光子纳秒的时间分辨率在这两个波段。红外线脉冲比可见光脉冲稍早到达。我们的三种分析方法给出的延迟的统计误差为$Δt_{obs} = 7.41 \pm 0.58$、$0.4 \pm 3.6$和$7.35 \pm 4.48$微秒(最多为脉冲星周期的1/4000)。我们将这种差异归因于可见光和红外脉冲形状略有不同的系统误差。无论这种延迟是来自脉冲星,是通过波长相关的介质引起的,还是由违反等效原理引起的,除非这些之间存在微调抵消,否则我们在$Δγ< 1.07 \times 10^{-10}~(3σ)$的这些波长处设置微分后牛顿参数的第一个上限。这一结果属于参数空间的一个未探索的区域,并补充了现有的限制等效原则违反快速射电暴,伽马射线暴,以及以前的限制从螃蟹。

英文摘要:

The Weak Equivalence Principle states that the geodesics of a test particle in a gravitational field are independent of the particle's constitution. To constrain violations of the Weak Equivalence Principle, we use the one-meter telescope at Table Mountain Observatory near Los Angeles to monitor the relative arrival times of pulses from the Crab Pulsar in the optical ($λ\approx 585$ nm) and near-infrared ($λ\approx 814$ nm) using an instrument which detects single photons with nanosecond-timing resolution in those two bands. The infrared pulse arrives slightly before the visible pulse. Our three analysis methods give delays with statistical errors of $Δt_{obs} = 7.41 \pm 0.58$, $0.4 \pm 3.6$, and $7.35 \pm 4.48$ microseconds (at most 1/4000 of the pulsar period). We attribute this discrepancy to systematic error from the fact that the visible and infrared pulses have slightly different shapes. Whether this delay emerges from the pulsar, is caused by passing through wavelength-dependent media, or is caused by a violation of the equivalence principle, unless there is a fine-tuned cancellation among these, we set the first upper limit on the differential post-Newtonian parameter at these wavelengths of $Δγ< 1.07 \times 10^{-10}~(3σ)$. This result falls in an unexplored region of parameter space and complements existing limits on equivalence-principle violation from fast radio bursts, gamma ray bursts, as well as previous limits from the Crab.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑