  The D3/D7 inflation is studied in the framework of Type 0B string theory. Due
to the presence of the closed string tachyon, the constant gauge field flux on
the transverse worldvolume of D7-brane is almost arbitrary in having an
attractive inflaton potential energy. Besides, a positive cosmological constant
appears in this model whose magnitude is related to the volume modulus of the
D7-brane transverse worldvolume.
