Minimal signatures of the Standard Model in non-Gaussianities
  We show that the leading coupling between a shift symmetric inflaton and the
Standard Model fermions leads to an induced electroweak symmetry breaking due
to particle production during inflation, and as a result, a unique oscillating
feature in non-Gaussianities. In this one parameter model, the enhanced
production of Standard Model fermions dynamically generates a new electroweak
symmetry breaking minimum, where the Higgs field classically rolls into. The
production of fermions stops when the Higgs expectation value and hence the
fermion masses become too large, suppressing fermion production. The balance
between the above-mentioned effects gives the Standard Model fermions masses
that are uniquely determined by their couplings to the inflaton. In particular,
the heaviest Standard Model fermion, the top quark, can produce a distinct
cosmological collider physics signature characterised by a one-to-one relation
between amplitude and frequency of the oscillating signal, which is observable
at future 21-cm surveys.
