Large Density Perturbations from Reheating to Standard Model particles
  due to the Dynamics of the Higgs Boson during Inflation
  Cosmic Microwave Background (CMB) observations are used to constrain
reheating to Standard Model (SM) particles after a period of inflation. As a
light spectator field, the SM Higgs boson acquires large field values from its
quantum fluctuations during inflation, gives masses to SM particles that vary
from one Hubble patch to another, and thereby produces large density
fluctuations. We consider both perturbative and resonant decay of the inflaton
to SM particles. For the case of perturbative decay from coherent oscillations
of the inflaton after high scale inflation, we find strong constraints on the
reheat temperature for the inflaton decay into heavy SM particles. For the case
of resonant particle production (preheating) to (Higgsed) SM gauge bosons, we
find temperature fluctuations larger than observed in the CMB for a range of
gauge coupling that includes those found in the SM and conclude that such
preheating cannot be the main source of reheating the Universe after inflation.
