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In this paper we study the creation of super-massive real scalar particles inthe framework of a $f(R)=R-\beta/R^n$ modified gravity theory, with parametersconstrained by observational data. The analysis is restrict to a homogeneousand isotropic flat and radiation dominated universe. We compare the results tothe standard Einstein gravity with cosmological constant ($\Lambda CDM$ model),and we show that the total number density of created particles in the $f(R)$model is very close to the standard case. Another interesting result is thatthe spectrum of created particles is $\beta$ independent at early times.

Particle creation in a f(R) theory with cosmological constraints