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The correspondence between galaxy major mergers and starburst activity iswell-established observationally and in simulations of low redshift galaxies.However, the evolution of the properties of interactions and of the galaxiesinvolved suggests that the starburst response of galaxies to merger eventscould vary across cosmic time. Using the VINTERGATAN cosmological zoom-insimulation of a Milky Way-like galaxy, we show here that starbursts, i.e.episodes of fast star formation, are connected with the onset of tidalcompression, itself induced by mergers. However, this compression becomesstrong enough to trigger starbursts only after the formation of the galacticdisc. As a consequence, starburst episodes are only found during a precisephase of galaxy evolution, after the formation of the disc and until the lastmajor merger. As the depletion time quantifies the instantaneous star formationactivity, while the specific star formation rate involves the integrated resultof the past activity (via the stellar mass), starburst episodes do notnecessarily coincide with elevated specific star formation rate. This suggeststhat not all starburst galaxies are outliers above the main sequence of galaxyformation.

The merger-starburst connection across cosmic times