Simulations show that an IMF extending to at least 200 solar masses is required to match both the observed mass-metallicity-SFR relation and cosmic star formation history at z greater than or equal to 4, due to enhanced yields from pair-instability supernovae.
(2012); V ogelsberger et al
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Impact of initial mass function on the chemical evolution of high-redshift galaxies
Simulations show that an IMF extending to at least 200 solar masses is required to match both the observed mass-metallicity-SFR relation and cosmic star formation history at z greater than or equal to 4, due to enhanced yields from pair-instability supernovae.