地球地震中的宇宙信号？
Cosmic signatures in earth's seismic tremor?
摘要：
即使在没有地震的情况下，地球上的每个地点都会经历连续的弹性振动，这些振动主要是由海浪的非线性相互作用引起的。然而，在兆赫频率的频谱的精细结构显示出数百个非常显着的窄带宽峰值，具有持久性和重合与太阳声本征模式，这是不兼容的任何地球物理起源。通过估计地球的引力波横截面，结合其弹性响应和由宇宙信号与海洋起源的震颤的干扰所产生的随机放大，来评估共同宇宙起源的可行性。测得的光谱峰出现兼容的重力单色照明在应变$h \gtrsim 10^{-20} $。我们详细分析了2.614 mHz附近的波段，预计双星白矮星J 0651 +2844 -这是已知的第二强引力恒星源-将发射。地球和太阳的光谱震颤峰值是一致的，但它们的振幅是3 o.m.。比独立的估计值大，因此引力源的归属将需要各种具有确定的质量-距离比的未知非发光源。
英文摘要：
Even in absence of earthquakes, each site on earth experiences continuous elastic vibrations which are mostly traced to the non-linear interactions of sea waves. However, the fine structure of the spectrum at mHz frequencies shows hundreds of highly significant narrow bandwidth peaks, with a persistence and a coincidence with solar acoustic eigenmodes which are incompatible with any geophysical origin. The feasibility of a common cosmic origin is evaluated through an estimate of the gravitational wave cross-section of the earth, combined with its elastic response and with the stochastic amplification produced by the interference of the cosmic signal with tremor of oceanic origin. The measured spectral peaks appear compatible with a gravitational monochromatic illumination at strains $h \gtrsim 10^{-20} $. We analize in detail the band around 2.614 mHz, where the binary white dwarf J0651+2844 - which is the second strongest known gravitational stellar source - is expected to emit. Compatible spectral tremor peaks are found for both the earth and the sun, but their amplitude is 3 o.m. larger than independent estimates, so that a gravitational source attribution would call for a variety of unknown non-luminous sources with definite mass-distance ratios.
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