On the Stewart-Lyth Inverse Problem
  In this paper the Stewart-Lyth inverse problem is rewritten using the comoving scales as the basic parameter. It is shown that some information on the inflaton potential can be obtained from observations taking into account only the scalar power spectrum. 
Eloy Ay\'on-Beato (1), Alberto Garc\'ia (1), Ricardo Mansilla (2),   C\'esar A. Terrero-Escalante (1) ((1) Depto. Fisica, CI...