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In simple models of galaxy formation and evolution, star formation is solelyregulated by the amount of gas present in the galaxy. However, it has recentlybeen shown that star formation can be suppressed by galactic dynamics ingalaxies that contain a dominant spheroidal component and a low gas fraction.This 'dynamical suppression' is hypothesised to also contribute to quenchinggas-rich galaxies at high redshift, but its impact on the galaxy population atlarge remains unclear. In this paper, we assess the importance of dynamicalsuppression in the context of gas regulator models of galaxy evolution throughhydrodynamic simulations of isolated galaxies, with gas-to-stellar mass ratiosof 0.01-0.20 and a range of galactic gravitational potentials fromdisc-dominated to spheroidal. Star formation is modelled using adynamics-dependent efficiency per free-fall time, which depends on the virialparameter of the gas. We find that dynamical suppression becomes more effectiveat lower gas fractions and quantify its impact on the star formation rate as afunction of gas fraction and stellar spheroid mass surface density. We combinethe results of our simulations with observed scaling relations that describethe change of galaxy properties across cosmic time, and determine the galaxymass and redshift range where dynamical suppression may affect the baryoncycle. We predict that the physics of star formation can limit and regulate thebaryon cycle at low redshifts ($z \lesssim 1.4$) and high galaxy masses($M_{\ast} \gtrsim 3 \times 10^{10}~M_{\odot}$), where dynamical suppressioncan drive galaxies off the star formation main sequence.

The Elephant in the Bathtub: when the physics of star formation regulate the baryon cycle of galaxies