  Earth Trojan Asteroids are an important but elusive population that co-orbit
with Earth at the L4 and L5 Lagrange points. There is only one known, but a
large population is theoretically stable and could provide insight into our
solar system's past and present as well as planetary defense. In this paper, we
present the results of an Earth Trojan survey that uses a novel shift-and-stack
detection method on two nights of data from the Dark Energy Camera. We find no
new Earth Trojan Asteroids. We calculate an upper limit on the population that
is consistent with previous searches despite much less sky coverage.
Additionally, we elaborate on previous upper limit calculations using current
asteroid population statistics and an extensive asteroid simulation to provide
the most up to date population constraints. We find an L4 Earth Trojan
population of NET < 1 for H = 13.93, NET < 7 for H = 16, and NET < 938 for H =
22.
