Cosmological Constraints from Multiple Probes in the Dark Energy Survey.

Autor: Abbott TMC; Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, Casilla 603, La Serena, Chile., Alarcon A; Institut d'Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain.; Institute of Space Sciences (ICE, CSIC), Campus UAB, Carrer de Can Magrans, s/n, 08193 Barcelona, Spain., Allam S; Fermi National Accelerator Laboratory, P. O. Box 500, Batavia, Illinois 60510, USA., Andersen P; School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia.; University of Copenhagen, Dark Cosmology Centre, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark., Andrade-Oliveira F; Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil.; Laboratório Interinstitucional de e-Astronomia-LIneA, Rua Gal. José Cristino 77, Rio de Janeiro, RJ 20921-400, Brazil., Annis J; Fermi National Accelerator Laboratory, P. O. 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Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2019 May 03; Vol. 122 (17), pp. 171301.
DOI: 10.1103/PhysRevLett.122.171301
Abstrakt: 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=-0.80_{-0.11}^{+0.09}. The geometry is shown to be consistent with a spatially flat Universe, and we obtain a constraint on the baryon density of Ω_{b}=0.069_{-0.012}^{+0.009} 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.
Databáze: MEDLINE