High-Frequency Gravitational Wave Communications

This Defense Intelligence Reference Document, produced under the Advanced Aerospace Weapon System Applications (AAWSA) Program in 2010, provides a comprehensive technical overview of the potential for high-frequency gravitational wave (HFGW) communications. The document posits that HFGWs, which are gravitational waves with frequencies higher than 100 kHz, could revolutionize telecommunications by providing a wireless system capable of transmitting information directly through the Earth without attenuation or the need for traditional infrastructure like fiber optic cables or satellite transponders.

The report details the history of HFGW research, noting that while low-frequency gravitational waves are detectable by instruments like LIGO, HFGWs require different generation and detection methods. The document evaluates various proposed HFGW generators, including piezoelectric and infrared-excited molecule approaches, and identifies the Li-Baker detector as the most promising receiver technology. The Li-Baker detector utilizes the 'Li-Effect,' a synchro-resonance condition where electromagnetic and gravitational waves interact to produce a perturbative photon flux, allowing for the detection of HFGW signals.

Operational concerns such as link budgets, signal-to-noise ratios, and bandwidth are analyzed, with the report suggesting that HFGW systems could provide significant improvements in timing and navigation, potentially serving as a supplement or alternative to GPS. The document outlines a developmental roadmap spanning from 2009 to 2050, emphasizing the need for continued theoretical research and the construction of laboratory prototypes. Beyond communications, the report explores other potential applications for HFGW technology, including HFGW-induced nuclear fusion, propulsion, and surveillance. The document concludes that while the technology is in its infancy, the theoretical foundations are sound, and further investment in laboratory-scale experiments is essential to validate these concepts and transition them into practical applications.