  Large-field inflation in supergravity requires the approximate global
symmetry needed to protect flatness of the scalar potential. In helical-phase
inflation, the U(1) symmetry of the Kahler potential is assumed, the phase part
of the complex scalar of a chiral superfield plays the role of inflaton, and
the radial part is strongly stabilized. The original model of helical phase
inflation, proposed by Li, Li and Nanopoulos (LLN), employs an extra
(stabilizer) superfield. We propose a more economical new class of the helical
phase inflationary models without a stabilizer superfield. As the specific
examples, the quadratic, the natural, and the Starobinsky-type inflationary
models are studied in our approach.
