The Hubble Tension, The Crisis of Late Time Deformation Models and the Reconstruction of Quintessence Lagrangians
arXiv:2109.06256 · doi:10.3390/universe7080300
Abstract
We present a detailed and pedagogical analysis of recent cosmological data, including CMB, BAO, SnIa and the recent local measurement of . We thus obtain constraints on the parameters of standard dark energy parameterizations, including , and deformation models such as (constant equation of state of dark energy), and the CPL model (corresponding to the evolving dark energy equation-of-state parameter ). The fitted parameters include the dark matter density , the SnIa absolute magnitude , the Hubble constant and the dark energy parameters (e.g., for ). All models considered lead to a best-fit value of that is inconsistent with the locally determined value obtained by Cepheid calibrators ( tension). We then use the best-fit dark energy parameters to reconstruct the quintessence Lagrangian that would be able to reproduce these best-fit parameterizations. Due to the derived late phantom behavior of the best-fit dark energy equation-of-state parameter , the reconstructed quintessence models have a negative kinetic term and are therefore plagued with instabilities.
69 pages,4 tables,33 figures. Based on the BSc thesis of AT. Published in Universe 7 (2021) 8, 300. The numerical analysis files that were used for the production of the figures may be downloaded from: https://github.com/TasosTheodoropoulos/M_crisis
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