A model-independent null test on the cosmological constant

2010/04/30 by Savvas Nesseris, Arman Shafieloo · 3 citations
Physics and Astronomy · #Constant (computer programming) #Cosmological constant #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Galaxies: Formation, Evolution, Phenomena #Hubble's law #Lambda #Lambda-CDM model #Metric expansion of space #Null (SQL) #Redshift #astro-ph.CO #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1111/j.1365-2966.2010.17254.x

published as Mon.Not.Roy.Astron.Soc.408:1879-1885,2010 · v1: 8 pages, 7 figures. v2: Typos corrected, sections 3,4 expanded, examples added, results unchanged. v3: changes match published version

openalex publication_date 2010/09/06 · arxiv created 2010/10/26 · arxiv updated 2015/03/13 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05

Abstract

We use the Om statistic and the genetic algorithms (GAs) in order to derive a null test on the spatially flat cosmological constant model Lambda cold dark matter (ΛCDM). This is done in two steps: first, we apply the GAs to the Constitution SNIa data in order to acquire a model-independent reconstruction of the expansion history of the Universe H(z) and secondly, we use the reconstructed H(z) in conjunction with the Om statistic, which is constant only for the ΛCDM model, to derive our constraints. We find that while ΛCDM is consistent with the data at the 2σ level, some deviations from ΛCDM model at low redshifts can be accommodated.

Citations

• Consistency Tests for the Cosmological Constant
• Can dark energy be decaying?
• Genetic algorithms and supernovae type Ia analysis
• Statefinder—A new geometrical diagnostic of dark energy
• Reconstructing Dark Energy
• Is cosmic acceleration slowing down?
• A Model‐Independent Determination of the Expansion and Acceleration Rates of the Universe as a Function of Redshift and Constraints on Dark Energy
• Three‐YearWilkinson Microwave Anisotropy Probe(WMAP) Observations: Implications for Cosmology

Cited by

• Reconstruction of the null-test for the matter density perturbations
• Crossing statistic: reconstructing the expansion history of the universe
• Machine learning forecasts of the cosmic distance duality relation with strongly lensed gravitational wave events