Defense Intelligence Reference Document High-Frequency Gravitational Wave Communications

Defense Intelligence Agency · 57 pages · text from the file's own layer

This Defense Intelligence Reference Document was prepared by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) program, is dated 6 April 2010 and is part of a series of advanced technology reports produced in FY 2009. It reviews proposed laboratory generators and detectors of high-frequency gravitational waves for communications. It favors an infrared-excited molecules transmitter and the Li-Baker detector, estimating about 1.9 million bits per second over 7,000 km through the Earth. It also discusses timing standards and interplanetary navigation uses.

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p. 4 …Change in Centrifugal Force of Orbiting Masses, .dfct, Replaced by Change in Tangential Force, Aft, to…
p. 5 …cannot be shielded or shadowed by planetary masses. Plasma interference seen at planetary entry would be…
p. 8 …Change in Centrifugal Force of Orbiting Masses, b.fc1, Replaced by Change in Tangential Force, 4ft…
p. 9 …as the particles move through a target mass. The usual difficulty with HFGWs generated by nuclear…
p. 10 …to an individual slice, P and its mass, m would be both one hundredth of their…
p. 13 …radiation pattern for a pair of orbiting masses. GW l I T GW Figure 4. Radiation…
p. 14 …The mass density of pentane is divided by its molecular mass and that gives the density…
p. 17 …In 1995 Tobar characterized multi-mode resonant-mass HFGW detectors and three years later in 1998…
p. 22 …E/c2 may be substituted for mass in an energy only system. This is depicted in…
p. 36 …as strongly affected by the presence of mass. Such a differential propagation delay comparison (between RF…
p. 41 …The concept is that the mass essentially "rolls" down a "hill" produced by the static g…
p. 47 …V. (2009a), "Lessons for Energy Resonance HFGW Detector Designs Learned from Mass Resonance and Interferometric LFGW…
p. 48 …Tobar, M, 1729-1736 E. (1995), "Characterizing multi-mode resonant-mass gravitational wave detectors," Journal of…
p. 49 …pairs of oppositely jerking at one-time mass elements, integer power of the generated gravitational waves…

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Figure 9. Birmingham University HFGW Detector
The INFN Genoa HFGW resonant antenna consists of two coupled, superconducting,
spherical, harmonic oscillators a few centimeters in diameter (see Figure 10). The
oscillators are designed to have (when uncoupled) almost equal resonant frequencies.
In theory, the system is expected to have a sensitivity to HFGWs with size (fractional
deformations) of about~ 2x 10·17 (Hz)'½ with an expectation to reach a sensitivity of~
2x10-20 (Hz/½ (Bernard, Gemme, Parodi, and Picasso (2001); Chincarini and Gemme.
(2003)). As of this date, however, there is no further development of the INFN Genoa
H FGW detector.
Figure 10. INFN Genoa HFGW Detector
The Kawamura 100 MHz HFGW detector has been built by the Astronomical
Observatory of Japan. It consists of two synchronous interferometers exhibiting an
arms length of 75 cm. Please see Figure 11. Its sensitivity is now about 10- 16 (Hz/½
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