Moduli Oscillation Induced by Reheating
  We estimate the abundance of the coherent oscillation of moduli, which
linearly couple to matter fields through higher dimensional operators. During
the (p)reheating after inflation, matter particles are efficiently produced and
it can affect the moduli potential in a non-adiabatic way, which results in the
coherent oscillation of the moduli. In particular, such effects are most
important at the very beginning of the (p)reheating. It is found that this
production mechanism is so efficient that a successful evolution of the
universe can be threatened even if the moduli mass is larger than the Hubble
scale.
