The Cepheid galactic internet

@article{Learned2008TheCG,
  title={The Cepheid galactic internet},
  author={John G. Learned and Rolf Peter Kudritzki and Sandip Pakvasa and Anthony Zee},
  journal={Contemporary Physics},
  year={2008},
  volume={53},
  pages={113 - 118}
}
We propose that a sufficiently advanced civilisation may employ Cepheid variable stars as beacons to transmit all-call information throughout the galaxy and beyond. They might employ a pulsed neutrino beam to trigger the expansion of a Cepheid at an earlier than normal time, generating a binary signature of normal period or artificially shortened period. One can construct many scenarios wherein it would be desirable for such a civilisation of star ticklers to transmit data to anyone else within… 

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