  Luminous Compact Blue Galaxies (LCBGs) are compact, star-forming galaxies
that are rarely observed in the local universe but abundant at z=1. This
increase in LCBG number density over cosmic lookback time roughly follows the
increase in the star formation rate density of the universe over the same
period. We use publicly available data in the COSMOS field to study the
evolution of the largest homogeneous sample of LCBGs to date by deriving their
luminosity function in four redshift bins over the range $0.1\leq~z\leq1$. We
find that over this redshift range, the characteristic luminosity (M$^{*}$)
increases by $\sim$0.2 mag, and the number density increases by a factor of
four. While LCBGs make up only about $18\%$ of galaxies more luminous than
M$_{B}=-$18.5 at $z\sim0.2$, they constitute roughly $54\%$ at z$\sim$0.9. The
strong evolution in number density indicates that LCBGs are an important
population of galaxies to study in order to better understand the decrease in
the star formation rate density of the universe since $z\sim1$.
