AAWSAP DIRD, High-Frequency Gravitational Wave Communications, April 2010

This Defense Intelligence Reference Document, DIA-08-1004-005, is dated 6 April 2010. The Defense Intelligence Agency's Defense Warning Office prepared it under the Advanced Aerospace Weapon System Applications program. It reviews proposed laboratory generators and detectors for high-frequency gravitational waves. It favors a piezoelectric approach for proof-of-concept tests, IR-excited molecules for an operational transmitter and the Li-Baker detector as the receiver. It estimates about 1.9 million bits per second over 7,000 km through the Earth and discusses timing standards and interplanetary navigation uses.

From the source: Release of 2026-09-18 Incident: 4/6/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD examines whether high-frequency gravitational waves could serve as a communications medium while avoiding the attenuation that limits radio-frequency systems. The report surveys proposed transmitter and detector concepts, argues that gravitational-wave communications could support secure point-to-point links, timing standards, and interplanetary navigation, and gives particular attention to laboratory generator concepts and the Li-Baker detector as possible building blocks for such a system. The document makes clear, however, that the entire concept depends on capabilities that had not been demonstrated in practice, including laboratory-scale generation and reliable detection of usable high-frequency gravitational-wave signals. It is an exploratory systems-oriented review built around a future communications concept.

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The stack of orbital planes are no replaced by a stack of N plates each containing n
molecules in each waveguide ring as exhibited in Figure 6. Now there is a HFGW wave
moving up the axis of the rings (or normal to the waveguide plates) and increasing in
strength according to the product nN2 .
GW GW
Figure 5. GW Flux Growth Analogous to Stack of N Figure 6. Stack of Circular-Wave-Guide Plates
Orbital Planes With Typical Molecule Jerks, df's
One should consider the IR rings in more detail. As calculated, the IR wavelength is
about 2.Sx10· 6 m. The IR waveguide has a cross-sectional area radius of A/4 in order
for it to be a monomode (lowest order mode) so that the phase doesn't change across
the waveguide. Thus the cross-sectional area of each IR ring is n x (2.Sx10·6 m/4 )2 =
l.23x 10-12 m2 and its diameter is 1.25xl0-6 m. The volume of each 100-m radius nano
size toroidal ring is 2n x (100) x (1.23x 10-12 ) = 7. 7x 10-12 m3 . The mass density of
pentane is divided by its molecular mass and that gives the density of jerkable masses
of 6.3x1028 m·3 . Thus the number of jerkable mass pairs, n, in a 100 m radius circular
wave guide 2n = (6.3xl028 ) x ( 7.7x 10-12 ) = 4.85x10 17 submicroscopic "particles" or
potentially jerkable masses or n = 2.45 x 1017 mass pairs. According to Table 1 of
Woods and Baker (2009) for pentane A= 4.62x 10-16 W. Thus the flux at one meter
distance for all of the mass pairs in a single ring from Equation (8) of Black and Baker
(2009) is n x (0.01146) x P; = 1.29 wm- 2• It should be recognized that the axes of the
opposite pentane molecules jerk (in response to the EM wave) may not be anti-parallel
and tangential to the circular waveguides. On the other hand, the radiation pattern for
the HFGW exhibits some omni-directional form, as shown in Figure 7, so significant
HFGW radiation will be directed along the axis of the stack of circular waveguides
(normal to the plates) and the HFGW will build up.
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