  It has recently been speculated that the end state of a collapsing universe
is a tachyonic big crunch. The time reversal of this process would be the
emergence of an expanding universe from a tachyonic big bang. In this
framework, we study the emergence of cosmological fluctuations. In particular,
we compare the amplitude of the perturbations at tne end of the tachyon phase
with what would be obtained assuming the usual vacuum initial conditions. We
find that cosmological fluctuations emerge in a thermal state. We comment on
the relation to the trans-Planckian problem of inflationary cosmology.
