For sufficiently small phi0 (below about 0.02 mPl), the inflaton condensate in this polynomial model fragments into long-lived oscillons, producing MHz-GHz gravitational waves and possibly seeding light primordial black holes.
Formation of subhorizon black holes from preheating
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abstract
We study the production of primordial black holes (PBHs) during the preheating stage that follows a chaotic inflationary phase. The scalar fields present in the process are evolved numerically using a modified version of the HLATTICE code. From the output of the numerical simulation, we compute the probability distribution of curvature fluctuations, paying particular attention to sub-horizon scales. We find that in some specific models these modes grow to large amplitudes developing highly non-Gaussian probability distributions. We then calculate PBH abundances using the standard Press-Schechter criterion and find that overproduction of PBHs is likely in some regions of the chaotic preheating parameter space.
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Inflaton Self Resonance, Oscillons, and Gravitational Waves in Small Field Polynomial Inflation
For sufficiently small phi0 (below about 0.02 mPl), the inflaton condensate in this polynomial model fragments into long-lived oscillons, producing MHz-GHz gravitational waves and possibly seeding light primordial black holes.