Cosmographic Degeneracy

Abstract

We examine the dark energy and matter densities allowed by precision measurements of distances out to various redshifts, in the presence of spatial curvature and (near) arbitrary behavior of the dark energy equation of state. Degeneracies among the parameters permit a remarkably large variation in their values when using only distance measurements of the late time universe and making no assumptions about the dark energy or curvature. Going beyond distance measurements to a lower limit on the growth of structure bounds the allowed region significantly but still leaves considerable freedom to match a flat LCDM model with dark energy very different from a cosmological constant. The combination of distances with Hubble parameter, gravitational lensing or other large scale structure data is essential to determining robustly the cosmological model.

6 pages, 3 figures, minor changes, results unchanged, matched Phys. Rev. D published version

References in corpus (4)

• A 3% Solution: Determination of the Hubble Constant with the Hubble Space Telescope and Wide Field Camera 3
• Two new diagnostics of dark energy
• Model Independent Reconstruction of the Expansion History of the Universe and the Properties of Dark Energy
• Non-parametric Dark Energy Degeneracies

Cited by in corpus (20)

• Late-time cosmology with 21cm intensity mapping experiments
• DESI 2024: Reconstructing Dark Energy using Crossing Statistics with DESI DR1 BAO data
• Observables and unobservables in dark energy cosmologies
• Lensing Time Delays and Cosmological Complementarity
• Cosmographic Constraints and Cosmic Fluids
• Einstein, Planck and Vera Rubin: relevant encounters between the Cosmological and the Quantum Worlds
• Dark energy, matter creation and curvature
• Probing Dark Energy through Scale Dependence
• Crossing Statistic: Reconstructing the Expansion History of the Universe
• Effective equation of state for running vacuum: "mirage" quintessence and phantom dark energy
• Crossing Statistic: Bayesian interpretation, model selection and resolving dark energy parametrization problem
• Confronting the concordance model of cosmology with Planck data
• How Flat is Our Universe Really?
• Growth of perturbations in nonlocal gravity with non-$\Lambda$CDM background
• Is dark energy evolving?
• Falsifying Cosmological Constant
• Expanding covariant cosmography of the local Universe: incorporating the snap and axial symmetry
• Gravitational Slip parameter and Gravitational Waves in Einstein-Cartan theory
• Unified dark fluid with null sound speed as an alternative to phantom dark energy
• Quasilinear observables in dark energy cosmologies