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Utilizing a high-resolution (114 pc/h) adaptive mesh-refinement cosmologicalgalaxy formation simulation of the standard cold dark matter model with a large(2000-3000 galaxies with stellar mass greater than 1e9 Msun) statisticalsample, we examine the role of major mergers in driving star formation at z>1in a cosmological setting, after validating that some of the key properties ofsimulated galaxies are in reasonable agreement with observations, includingluminosity functions, SF history, effective sizes and damped Lyman alphasystems. We find that major mergers have a relatively modest effect on starformation, in marked contrast to previous idealized merger simulations of diskgalaxies that show up to two orders of magnitude increase in star formationrate. At z=2.4-3.7, major mergers tend to increase the specific star formationrate by 10-25% for galaxies in the entire stellar mass range 10^9-10^12 Msunprobed. Their effect appears to increase with decreasing redshift, but iscapped at 60% at z=1.4-2.4. Two factors may account for this modest effect.First, SFR of galaxies not in major mergers are much higher at z>1 than localdisk galaxy counterparts. Second, most galaxies at z>1 have small sizes andcontain massive dense bulges, which suppress the merger induced structuraleffects and gas inflow enhancement. Various other predictions are also madethat will provide verifiable tests of the model.

Inconsequence of Galaxy Major Mergers in Driving Star Formation at z>1: Insights from Cosmological Simulations