Higgscitement: Cosmological Dynamics of Fine Tuning
  The Higgs potential appears to be fine-tuned, hence very sensitive to values
of other scalar fields that couple to the Higgs. We show that this feature can
lead to a new epoch in the early universe featuring violent dynamics coupling
the Higgs to a scalar modulus. The oscillating modulus drives tachyonic Higgs
particle production. We find a simple parametric understanding of when this
process can lead to rapid modulus fragmentation, resulting in gravitational
wave production. A nontrivial equation-of-state arising from the nonlinear
dynamics also affects the time elapsed from inflation to the CMB, influencing
fits of inflationary models. Supersymmetric theories automatically contain
useful ingredients for this picture.
