Particle creation during inflation is considered. It could be important for
species whose interaction is of gravitational strength or weaker. A complete
but economical formalism is given for spin-zero and spin-half particles, and
the particle abundance is estimated on the assumption that the particle mass in
the early universe is of order the Hubble parameter H. It is roughly the same
for both spins, and it is argued that the same estimate should hold for higher
spin particles in particular the gravitino. The abundance is bigger than that
from the usual particle collision mechanism if the inflationary energy scale is
of order 1016GeV, but not if it is much lower.Comment: 17 pages, no Figure
