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In F-term supergravity inflation models, scalar fields other than theinflaton generically receive a Hubble induced mass, which may restore gaugesymmetries during inflation and phase transitions may occur during or afterinflation as the Hubble parameter decreases. We study monopole (and domainwall) production associated with such a phase transition in chaotic inflationin supergravity and obtain a severe constraint on the symmetry breaking scalewhich is related with the tensor-to-scalar ratio. Depending on modelparameters, it is possible that monopoles are sufficiently diluted to be freefrom current constraints but still observable by planned experiments.

Phase transition and monopole production in supergravity inflation