Artículos de revistas
DES Y1 results: Splitting growth and geometry to test ΛcDM
Fecha
2021-01-21Registro en:
Physical Review D, v. 103, n. 2, 2021.
2470-0029
2470-0010
10.1103/PhysRevD.103.023528
2-s2.0-85100411365
Autor
Stanford University
University of Hawaii
University of Arizona
University of Pennsylvania
California Institute of Technology
Newcastle University
University of Michigan
University College London
University of Chicago
University of Portsmouth
Carnegie Mellon University
Universidade Estadual Paulista (UNESP)
Ohio State University
Duke University
University of Edinburgh
Harvard and Smithsonian
Institut d'Estudis Espacials de Catalunya (IEEC)
Institute of Space Sciences (ICE-CSIC
University of Queensland
382 Via Pueblo Mall
SLAC National Accelerator Laboratory
Australian National University
LPC
NSF's National Optical-Infrared Astronomy Research Laboratory
Universidade de São Paulo (USP)
Laboratório Interinstitucional de E-Astronomia-LIneA
Fermi National Accelerator Laboratory
Universidad Autonoma de Madrid
Institut d'Astrophysique de Paris
University of Sussex
University of Manchester
Instituto de Astrofisica de Canarias
Universidad de la Laguna
University of Illinois at Urbana-Champaign
National Center for Supercomputing Applications
Barcelona Institute of Science and Technology
University of Wisconsin-Madison
INAF-Osservatorio Astronomico di Trieste
Institute for Fundamental Physics of the Universe
Observatório Nacional
IIT Hyderabad
Ludwig-Maximilians-Universität
Santa Cruz Institute for Particle Physics
University of Oslo
University of Cambridge
Max Planck Institute for Extraterrestrial Physics
Ludwig-Maximilians Universität München
Center for Astrophysics | Harvard and Smithsonian
Macquarie University
Lowell Observatory
Institució Catalana de Recerca i Estudis Avançats
Peyton Hall
Medioambientales y Tecnológicas (CIEMAT)
University of Southampton
Oak Ridge National Laboratory
Institución
Resumen
We analyze Dark Energy Survey (DES) data to constrain a cosmological model where a subset of parameters - focusing on ωm - are split into versions associated with structure growth (e.g., ωmgrow) and expansion history (e.g., ωmgeo). Once the parameters have been specified for the ΛCDM cosmological model, which includes general relativity as a theory of gravity, it uniquely predicts the evolution of both geometry (distances) and the growth of structure over cosmic time. Any inconsistency between measurements of geometry and growth could therefore indicate a breakdown of that model. Our growth-geometry split approach therefore serves both as a (largely) model-independent test for beyond-ΛCDM physics, and as a means to characterize how DES observables provide cosmological information. We analyze the same multiprobe DES data as [Phys. Rev. Lett. 122, 171301 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.171301]: DES Year 1 (Y1) galaxy clustering and weak lensing, which are sensitive to both growth and geometry, as well as Y1 BAO and Y3 supernovae, which probe geometry. We additionally include external geometric information from BOSS DR12 BAO and a compressed Planck 2015 likelihood, and external growth information from BOSS DR12 RSD. We find no significant disagreement with ωmgrow=ωmgeo. When DES and external data are analyzed separately, degeneracies with neutrino mass and intrinsic alignments limit our ability to measure ωmgrow, but combining DES with external data allows us to constrain both growth and geometric quantities. We also consider a parametrization where we split both ωm and w, but find that even our most constraining data combination is unable to separately constrain ωmgrow and wgrow. Relative to ΛCDM, splitting growth and geometry weakens bounds on σ8 but does not alter constraints on h.