  Pressure-regulated star formation is a simple variant on the usual
supernova-regulated star formation efficiency that controls the global star
formation rate as a function of cold gas content in star-forming galaxies, and
accounts for the Schmidt-Kennicutt law in both nearby and distant galaxies.
Inclusion of AGN-induced pressure, by jets and/or winds that flow back onto a
gas-rich disk, can lead under some circumstances to significantly enhanced star
formation rates, especially at high redshift and most likely followed by the
more widely accepted phase of star formation quenching. Simple expressions are
derived that relate supermassive black hole growth, star formation and outflow
rates. The ratios of black hole to spheroid mass and of both black hole
accretion and outflow rates to star formation rate are predicted as a function
of time. I suggest various tests of the AGN-triggered star formation
hypothesis.
