  In conventional scenario of thermal inflation, the requirement that the
reheating temperature must be larger than the temperature of the
nucleosynthesis puts a lower bound on the mass of the inflaton field. At the
same time, the mass of the inflaton field and the height of the potential
during thermal inflation are intimately related. With these conditions, the
conventional models for thermal inflation are quite restricted. Naively, one
can expect that the above constraints may be removed if thermal inflation is
realized within the setups for hybrid inflation. In this paper we show why it
is difficult to construct hybrid models for thermal inflation within
conventional supergravity, and then show a successful example in models for the
braneworld. Our mechanism is based on the idea of non-tachyonic brane
inflation.
