  The $N=1$ supergravity models of cosmological inflation with inflaton
belonging to a massive vector multiplet and spontaneous SUSY breaking after
inflation are reformulated as the supersymmetric $U(1)$ gauge theories of a
massless vector superfield interacting with the Higgs and Polonyi chiral
superfields, all coupled to supergravity. The $U(1)$ gauge sector is identified
with the $U(1)$ gauge fields of the super-GUT coupled to supergravity, whose
gauge group has a $U(1)$ factor. A positive cosmological constant (dark energy)
is included. The scalar potential is calculated, and its de Sitter vacuum
solution is found to be stable.
