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Non-universal stellar initial mass functions: large uncertainties in star formation rates at <i>z</i> ≈ 2–4 and other astrophysical probes
ABSTRACT We explore the assumption, widely used in many astrophysical calculations, that the stellar initial mass function (IMF) is universal across all galaxies. By considering both a canonical broken-power-law IMF and a non-universal IMF, we are able to compare the effect of different IMFs on multiple observables and derived quantities …