Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2017/01/023
Keywords
dark energy theory; dark energy experiments
Funding
- CONACyT
- University of Edinburgh
- STFC [ST/K006606/1, ST/L000644/1]
- BIS National E-infrastructure capital grant [ST/J005673/1]
- STFC grants [ST/H008586/1, ST/K00333X/1]
- Science and Technology Facilities Council [ST/L000636/1, ST/P000673/1, ST/M007065/1, ST/K00333X/1, ST/M00418X/1, ST/J005673/1] Funding Source: researchfish
- STFC [ST/M007065/1, ST/M00418X/1, ST/P000673/1, ST/K00333X/1, ST/L000636/1, ST/J005673/1] Funding Source: UKRI
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The pseudo-Nambu-Goldstone Boson (PNGB) potential, defined through the amplitude M-4 and width f of its characteristic potential V (phi) = M-4 [1 + cos(phi / f)], is one of the best-suited models for the study of thawing quintessence. We analyse its present observational constraints by direct numerical solution of the scalar field equation of motion. Observational bounds are obtained using Supernovae data, cosmic microwave background temperature, polarization and lensing data from Planck, direct Hubble constant constraints, and baryon acoustic oscillations data. We find the parameter ranges for which PNGB quintessence gives a viable theory for dark energy. This exact approach is contrasted with the use of an approximate equation-of-state parametrization for thawing theories. We also discuss other possible parameterization choices, as well as commenting on the accuracy of the constraints imposed by Planck alone. Overall our analysis highlights a significant prior dependence to the outcome coming from the choice of modelling methodology, which current data are not sufficient to override.
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