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The phase structure associated with the chiral symmetry is thoroughlyinvestigated in de Sitter spacetime in the supersymmetric Nambu-Jona-Lasiniomodel with supersymmetry breaking terms. The argument is given in the three andfour space-time dimensions in the leading order of the 1/N expansion and it isshown that the phase characteristics of the chiral symmetry is determined bythe curvature of de Sitter spacetime. It is found that the symmetry breakingtakes place as the first order as well as second order phase transitiondepending on the choice of the coupling constant and the parameter associatedwith the supersymmetry breaking term. The critical curves expressing the phaseboundary are obtained. We also discuss the model in the context of the chaoticinflation scenario where topological defects (cosmic strings) develop duringthe inflation.Comment: 29 pages, 6 figures, REVTe

Curvature-induced phase transitions in the inflationary universe: Supersymmetric Nambu–Jona-Lasinio model in de Sitter spacetime