New model of massive spin two field
  We propose a new ghost-free model describing massive spin two field. This
model consists of a kinetic term and interaction terms without derivative. We
report on the properties of this model, especially we consider what could
happen when this model couples with gravity. Although the model does not
generate any ghost on the Minkowski space-time, it is not so clear whether or
not this property is preserved even on curved space-time. In fact, Buchbinder
et al. have found that the ghost appears even in the Fierz-Pauli theory on
curved space-time if we do not include non-minimal coupling terms. We report on
the model with interactions on curved space-time and show that we can construct
a model without ghost by including non-minimal coupling terms.
