对超声波的地球物理研究的建议
Proposal for a geophysical search for dilatonic waves
摘要：
我们提出了一种新的方法来搜索的成分依赖的超声波，预测的统一理论弦。该方法利用超导重力仪探测由超声波激发的地球内核平动引起的地球表面重力变化。该方法在$\sim$ 7 $\times$ 10 $^{-5}$ Hz的频率下具有最佳灵敏度，该频率低于使用引力波探测器的先前提议的灵敏频率：$\sim$ 10至1000 Hz。利用超导重力仪的表面重力测量结果，并假设一个简单的地球模型，我们提出了初步的能量密度的随机背景下的无质量介子在低频率的上限。虽然目前的结果受到地球模型的不确定性的限制，这种方法有可能在一个新的窗口中检测超声波。
英文摘要：
We propose a new method of searching for the composition-dependent dilatonic waves, predicted by unified theories of strings. In this method, Earth's surface-gravity changes due to translational motions of its inner core, excited by dilatonic waves, are searched for by using superconducting gravimeters. This method has its best sensitivity at the frequency of $\sim$ 7 $\times$ 10$^{-5}$ Hz, which is lower than the sensitive frequencies of previous proposals using gravitational-wave detectors: $\sim$ 10 to 1000 Hz. Using available results of surface-gravity measurements with superconducting gravimeters and assuming a simple Earth model, we present preliminary upper limits on the energy density of a stochastic background of massless dilatons at the low frequency. Though the results are currently limited by the uncertainty in the Earth model, this method has a potential of detecting dilatonic waves in a new window.
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