Artículos de revistas
DES Y1 results: Splitting growth and geometry to test Lambda CDM
Fecha
2021-01-21Registro en:
Physical Review D. College Pk: Amer Physical Soc, v. 103, n. 2, 38 p., 2021.
2470-0010
10.1103/PhysRevD.103.023528
WOS:000609262900005
Autor
Stanford Univ
Univ Hawaii
Univ Arizona
Univ Penn
CALTECH
Newcastle Univ
Univ Michigan
UCL
Univ Chicago
Univ Portsmouth
Carnegie Mellon Univ
Universidade Estadual Paulista (Unesp)
Ohio State Univ
Duke Univ
Univ Edinburgh
Harvard & Smithsonian
Inst Estudis Espacials Catalunya IEEC
CSIC
Univ Queensland
SLAC Natl Accelerator Lab
Australian Natl Univ
Univ Clermont Auvergne
Cerro Tololo Interamer Observ
Universidade de São Paulo (USP)
Lab Interinst E Astron LIneA
Fermilab Natl Accelerator Lab
Univ Autonoma Madrid
Inst Astrophys Paris
Sorbonne Univ
Univ Sussex
Univ Manchester
Inst Astrofis Canarias
Univ La Laguna
Univ Illinois
Natl Ctr Supercomp Applicat
Barcelona Inst Sci & Technol
Univ Wisconsin
INAF Osservatorio Astron Trieste
Inst Fundamental Phys Universe
Observ Nacl
IIT Hyderabad
Ludwig Maximilians Univ Munchen
Santa Cruz Inst Particle Phys
Univ Oslo
Univ Cambridge
Max Planck Inst Extraterr Phys
Macquarie Univ
Lowell Observ
Inst Catalana Recerca & Estudis Avancats
Princeton Univ
Ctr Invest Energet Medioambientales & Tecnol CIEM
Univ Southampton
Oak Ridge Natl Lab
Institución
Resumen
We analyze Dark Energy Survey (DES) data to constrain a cosmological model where a subset of parameters-focusing on Omega(m)-are split into versions associated with structure growth (e.g., Omega(grow)(m)) and expansion history (e.g., Omega(geo)(m)). Once the parameters have been specified for the Lambda CDM 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-Lambda CDM 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)] : 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 Omega(grow)(m) = Omega(geo)(m). When DES and external data are analyzed separately, degeneracies with neutrino mass and intrinsic alignments limit our ability to measure Omega(grow)(m), but combining DES with external data allows us to constrain both growth and geometric quantities. We also consider a parametrization where we split both Omega(m) and w, but find that even our most constraining data combination is unable to separately constrain Omega(grow)(m) and w(grow). Relative to Lambda CDM, splitting growth and geometry weakens bounds on sigma(8) but does not alter constraints on h.