'Hidden photons' to send secret emails through Earth


By Jon Cartwright IF YOU shine a laser on the floor, where does the light go? With the right preparation, some of it might pop out at the other side of the world – an effect that could be exploited to transmit secret messages through the ground. That is the conclusion of Andreas Ringwald at the German Electron Synchrotron (DESY) in Hamburg, and colleagues, who have explored the possibility of hypothetical particles called “hidden photons” (www.arxiv.org/abs/0903.5300). “If such particles exist, then we can use them to communicate,
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