Inflation and inverse symmetry breaking

An inflation model with inverse symmetry breaking of two scalar fields is proposed. Constraints on the parameters for successful inflation are obtained. In general the inequality lambda(1) much less than g<lambda(2) should be satisfied, where lambda(1,2) and g are the coupling constants for self-interaction and mutual interaction of two scalar fields, respectively. An example with an SU(5) GUT phase transition and numerical study is presented. This model introduces a new mechanism for the onset of inflation.