  We explore a new possibility that some inflaton fields in multi-field
inflation models satisfy the observed value of the spectral index so that the
curvature perturbation generated by them through post-inflationary dynamics may
be relevant for the current observations. We illustrate this point using a
simple and reasonable multi-field chaotic inflation model motivated from string
theory. Possible non-Gaussianity and the tensor-to-scalar ratio are briefly
addressed.
