The observational constraints on the flat $\phi $CDM models

Avsajanishvili, Olga; Huang, Yiwen; Samushia, Lado; Kahniashvili, Tina

doi:10.1140/epjc/s10052-018-6233-y

Title: The observational constraints on the flat $$\phi $$CDM models

Journal Article · Wed Sep 26 00:00:00 EDT 2018 · European Physical Journal. C, Particles and Fields

DOI:https://doi.org/10.1140/epjc/s10052-018-6233-y· OSTI ID:1506649

Avsajanishvili, Olga ^[1]; Huang, Yiwen ^[2]; Samushia, Lado ^[3]; Kahniashvili, Tina ^[4]

Ilia State University, Tbilisi, GA (United States)
University of California, San Diego, La Jolla, CA (United States)
Ilia State University, Tbilisi, GA (United States); Kansas State Univ., Manhattan, KS (United States)
Ilia State University, Tbilisi, GA (United States); Carnegie Mellon Univ., Pittsburgh, PA (United States); Laurentian University, Sudbury (Canada)

Most dark energy models have the ΛCDM as their limit, and if future observations constrain our universe to be close to ΛCDM Bayesian arguments about the evidence and the fine-tuning will have to be employed to discriminate between the models. Assuming a baseline ΛCDM model we investigate a number of quintessence and phantom dark energy models, and we study how they would perform when compared to observational data, such as the expansion rate, the angular distance, and the growth rate measurements, from the upcoming Dark Energy Spectroscopic Instrument (DESI) survey. We sample posterior likelihood surfaces of these dark energy models with Monte Carlo Markov Chains while using central values consistent with the Planck ΛCDM universe and covariance matrices estimated with Fisher information matrix techniques. We find that for this setup the Bayes factor provides a substantial evidence in favor of the ΛCDM model over most of the alternatives. We also investigated how well the CPL parametrization approximates various scalar field dark energy models, and identified the location for each dark energy model in the CPL parameter space.

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Research Organization:: Kansas State Univ., Manhattan, KS (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG03-99ER41093

OSTI ID:: 1506649

Journal Information:: European Physical Journal. C, Particles and Fields, Vol. 78, Issue 9; ISSN 1434-6044

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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