Cosmological Constraints from Multiple Probes in the Dark Energy Survey
Date
2019
Authors
Abbott, T. M. C.
Alarcon, A.
Allam, Sahar
Andersen, P.
Andrade-Oliveira, F.
Annis, James
Asorey, J.
Avila, S.
Bacon, David
Banik, N.
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American Physical Society
Abstract
The combination of multiple observational probes has long been advocated as a powerful technique to
constrain cosmological parameters, in particular dark energy. The Dark Energy Survey has measured 207
spectroscopically confirmed type Ia supernova light curves, the baryon acoustic oscillation feature, weak
gravitational lensing, and galaxy clustering. Here we present combined results from these probes, deriving
constraints on the equation of state, w, of dark energy and its energy density in the Universe. Independently
of other experiments, such as those that measure the cosmic microwave background, the probes from this
single photometric survey rule out a Universe with no dark energy, finding w ¼ −0.80þ0.09 −0.11 . The geometry
is shown to be consistent with a spatially flat Universe, and we obtain a constraint on the baryon density of
Ωb ¼ 0.069þ0.009 −0.012 that is independent of early Universe measurements. These results demonstrate the
potential power of large multiprobe photometric surveys and pave the way for order of magnitude advances
in our constraints on properties of dark energy and cosmology over the next decade.
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Physical Review Letters
Type
Journal article
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Open Access
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