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We study the impact of different galaxy statistics and empirical metallicityscaling relations on the merging rates and on the properties of compact objectsbinaries. First, we analyze the similarities and differences of using the starformation rate functions or the stellar mass functions as galaxy statistics forthe computation of the cosmic star formation rate density. Then we investigatethe effects of adopting the Fundamental Metallicity Relation or a classic MassMetallicity Relation to assign metallicity to galaxies with given properties.We find that when the Fundamental Metallicity Relation is exploited, the bulkof the star formation occurs at relatively high metallicities even at highredshift; the opposite holds when the Mass Metallicity Relation is employed,since in this case the metallicity at which most of the star formation takesplace strongly decreases with redshift. We discuss the various reasons andpossible biases originating this discrepancy. Finally, we show the impact thatthese different astrophysical prescriptions have on the merging rates and onthe properties of compact objects binaries; specifically, we present resultsfor the redshift dependent merging rates and for the chirp mass and time delaydistributions of the merging binaries.

Evolution of Galaxy Star Formation and Metallicity: Impact on Double Compact Objects Mergers