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We investigate the emergence of large, localized, pseudo-stableconfigurations (oscillons) from inflaton fragmentation at the end of inflation.We predict the number density of large oscillons, and the conditions necessaryfor their emergence in a class of inflationary models. Analytic estimates areprovided for a 3+1 and 1+1-dimensional universe. We test our predictions withdetailed numerical simulations in 1+1-dimensions. We see a zoo of oscillonsemerging from the simulations, including the usual small amplitude "sech"oscillons as well as large "flat-topped" oscillons. The emergent oscillonsaccount for approximately 80 per cent of the energy density of the inflaton.

Inflaton fragmentation: Emergence of pseudo-stable inflaton lumps (oscillons) after inflation