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Made available in DSpace on 2022-04-29T08:29:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-21
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.
Kavli Institute for Particle Astrophysics and Cosmology Stanford University, P.O. Box 2450
Institute for Astronomy University of Hawaii, 2680 Woodlawn Drive
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Department of Physics and Astronomy University of Pennsylvania
Jet Propulsion Laboratory California Institute of Technology, 4800 Oak Grove Drive
School of Mathematics Statistics and Physics Newcastle University
Department of Physics University of Michigan
Department of Physics and Astronomy University College London, Gower Street
Kavli Institute for Cosmological Physics University of Chicago
Institute of Cosmology and Gravitation University of Portsmouth
Department of Physics Carnegie Mellon University
Instituto de Física Teórica Universidade Estadual Paulista
Center for Cosmology and Astro-Particle Physics Ohio State University
Department of Physics Ohio State University
Department of Physics Duke University
Institute for Astronomy University of Edinburgh
Center for Astrophysics Harvard and Smithsonian, 60 Garden Street
Institut d'Estudis Espacials de Catalunya (IEEC)
Institute of Space Sciences (ICE-CSIC Campus UAB, Carrer de Can Magrans, s/n
School of Mathematics and Physics University of Queensland
Department of Physics Stanford University 382 Via Pueblo Mall
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Centre for Gravitational Astrophysics College of Science Australian National University
Research School of Astronomy and Astrophysics Australian National University
Université Clermont Auvergne CNRS IN2P3 LPC
Department of Astronomy and Astrophysics University of Chicago
Cerro Tololo Inter-American Observatory NSF's National Optical-Infrared Astronomy Research Laboratory, Casilla 603
Departamento de Física Matemática Instituto de Física Universidade de São Paulo, CP 66318
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Observatório Nacional, Rua General José Cristino 77
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Santa Cruz Institute for Particle Physics
Department of Astronomy University of Michigan
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Institute of Astronomy University of Cambridge, Madingley Road
Kavli Institute for Cosmology University of Cambridge, Madingley Road
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Universitäts-Sternwarte Fakultät für Physik Ludwig-Maximilians Universität München, Scheinerstrasse 1
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Australian Astronomical Optics Macquarie University
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Department of Astrophysical Sciences Princeton University Peyton Hall
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
School of Physics and Astronomy University of Southampton
Computer Science and Mathematics Division Oak Ridge National Laboratory
Instituto de Física Teórica Universidade Estadual Paulista
