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Planck 2015 constraints on spatially-flat dynamical dark energy models

  • Junpei OobaEmail author
  • Bharat Ratra
  • Naoshi Sugiyama
Original Article

Abstract

We determine constraints on spatially-flat tilted dynamical dark energy XCDM and \(\phi \)CDM inflation models by analyzing Planck 2015 cosmic microwave background (CMB) anisotropy data and baryon acoustic oscillation (BAO) distance measurements. XCDM is a simple and widely used but physically inconsistent parameterization of dynamical dark energy, while the \(\phi \)CDM model is a physically consistent one in which a scalar field \(\phi \) with an inverse power-law potential energy density powers the currently accelerating cosmological expansion. Both these models have one additional parameter compared to standard \(\varLambda \)CDM and both better fit the TT + lowP + lensing + BAO data than does the standard tilted flat-\(\varLambda \)CDM model, with \(\Delta \chi ^{2} = -1.26\ (-1.60)\) for the XCDM (\(\phi \)CDM) model relative to the \(\varLambda \)CDM model. While this is a 1.1\(\sigma \) (1.3\(\sigma \)) improvement over standard \(\varLambda \)CDM and so not significant, dynamical dark energy models cannot be ruled out. In addition, both dynamical dark energy models reduce the tension between the Planck 2015 CMB anisotropy and the weak lensing \(\sigma _{8}\) constraints.

Keywords

Cosmic background radiation Cosmological parameters Large-scale structure of universe Observations 

Notes

Acknowledgements

We thank G. Horton-Smith and C.-G. Park for helpful discussions. We thank the referee for comments that helped us improve the paper. This work is supported by Grants-in-Aid for Scientific Research from JSPS (Nos. 16J05446 (J.O.) and 15H05890 (N.S.)). B.R. is supported in part by DOE grant DE-SC0019038.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Physics and AstrophysicsNagoya UniversityNagoyaJapan
  2. 2.Department of PhysicsKansas State UniversityManhattanUSA
  3. 3.Kobayashi-Maskawa Institute for the Origin of Particles and the UniverseNagoya UniversityNagoyaJapan
  4. 4.Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU)The University of TokyoChibaJapan

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