Anomalous spectral lines and relic quantum nonequilibrium
  We describe features that could be observed in the line spectra of relic
cosmological particles should quantum nonequilibrium be preserved in their
statistics. According to our arguments, these features would represent a
significant departure from those of a conventional origin. Among other
features, we find a possible spectral broadening that is proportional to the
energy resolution of the recording telescope (and so could be much larger than
any conventional broadening). Notably, for a range of possible initial
conditions we find the possibility of spectral line "narrowing", whereby a
telescope could observe a line that is narrower than it is conventionally able
to resolve. We discuss implications for the indirect search for dark matter,
with particular reference to some recent controversial spectral lines.
