作为SETI观测的功率束泄漏辐射
Power Beaming Leakage Radiation as a SETI Observable
摘要：
来自先进文明的最可观测到的泄漏辐射很可能来自于使用能量束传输能量和加速航天器。能量束的应用包括将航天器发射到轨道，将卫星提升到更高的轨道，以及涉及货物或乘客的空间转移的行星际概念。我们还量化了光束驱动发射到外太阳系，星际先驱和最终的星际飞船。我们估计的主要观测参数的功率聚束泄漏。地外文明知道他们的能量束可以被观察到，所以可以在能量束上放一条信息，并广播给我们接收，而几乎不需要额外的能量或成本。通过观察能量束的泄漏，我们可以发现嵌入在能量束上的信息。艾伦望远镜阵列最近对异常恒星KIC 8462852的观测，对该系统中的地外能量辐射设置了一些限制。我们表明，大多数功率光束的应用与我们的太阳系建议将是可检测的，如果使用由ATA监测的频率范围，因此，缺乏检测是一个有意义的，如果适度的，在该系统中的地外功率光束的约束。在进行更广泛的观察之前，有限的观察时间和频率覆盖范围在频率和持续时间上不够广泛，无法得出明确的结论。这样的光束在很远的星际距离上都是可见的。这意味着SETI搜索的一种新方法：不是关注另一个文明产生的窄带信标传输，而是寻找具有更宽带宽的更强大的波束。这需要一种新的方法来通过地球上的望远镜发现它们。功率聚束应用的进一步研究应该做，这可以扩大我们在这里讨论的可观察特征的参数空间。
英文摘要：
The most observable leakage radiation from an advanced civilization may well be from the use of power beaming to transfer energy and accelerate spacecraft. Applications suggested for power beaming involve launching spacecraft to orbit, raising satellites to a higher orbit, and interplanetary concepts involving space-to-space transfers of cargo or passengers. We also quantify beam-driven launch to the outer solar system, interstellar precursors and ultimately starships. We estimate the principal observable parameters of power beaming leakage. Extraterrestrial civilizations would know their power beams could be observed, and so could put a message on the power beam and broadcast it for our receipt at little additional energy or cost. By observing leakage from power beams we may find a message embedded on the beam. Recent observations of the anomalous star KIC8462852 by the Allen Telescope Array set some limits on extraterrestrial power beaming in that system. We show that most power beaming applications commensurate with those suggested for our solar system would be detectable if using the frequency range monitored by the ATA, and so the lack of detection is a meaningful, if modest, constraint on extraterrestrial power beaming in that system. Until more extensive observations are made, the limited observation time and frequency coverage are not sufficiently broad in frequency and duration to produce firm conclusions. Such beams would be visible over large interstellar distances. This implies a new approach to the SETI search: Instead of focusing on narrowband beacon transmissions generated by another civilization, look for more powerful beams with much wider bandwidth. This requires a new approach for their discovery by telescopes on Earth. Further studies of power beaming applications should be done, which could broaden the parameter space of observable features we have discussed here.
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