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We investigate cosmological consequences of an extended gravity model whichbelongs to the same class studied by Accetta and Steinhardt in an extendedinflationary scenario. But we do not worry about inflation in our model;instead, we focus on a topological object formed during cosmological phasetransitions. Although domain walls appear during first-order phase transitionssuch as QCD transition, they decay at the end of the phase transition.Therefore the "domain wall problem" does not exist in the suitable range ofpameters and, on the contrary, the "fragments" of walls may become seeds ofdark matter. A possible connection to "oscillating universe" model offered byMorikawa et al. is also discussed.

Decaying Domain Walls in an Extended Gravity Model and Cosmology