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A. Bedroya and C. Vafa, JHEP 09
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A. Bedroya, R. Brandenberger, M. Loverde, and C. Vafa, Phys. Rev. D 101
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A. Lewis, “GetDist: a Python package for analysing Monte Carlo samples,” (2019), arXiv:1910.13970 [astro-ph, physics:physics]
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1910
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2024

Do Observations Prefer Thawing Quintessence?

Payeur, Guillaume, McDonough, Evan, Brandenberger, Robert

Understand

In light of recent observations by the Dark Energy Spectroscopic Instrument (DESI), we study evidence for thawing quintessence over a cosmological constant as dark energy, with emphasis on the effect of the choice of priors.

Working with a parametrization for the equation of state parameter motivated by the theory, we analyse the DESI BAO data jointly with Planck 2018 and Pantheon+ or Dark Energy Survey supernovae data, and find a preference for thawing quintessence compared to a bare cosmological constant only if we use priors which are heavily informed by the data itself.
If we extend the priors to physically better motivated ranges, the evidence for thawing quintessence disappears.

Built on

E. Palti, Fortsch. Phys. 67
Original
1903
Earlier work this paper cites.
A. Bedroya and C. Vafa, JHEP 09
Original
1909
Earlier work this paper cites.
A. Bedroya, R. Brandenberger, M. Loverde, and C. Vafa, Phys. Rev. D 101
Original
1909
Earlier work this paper cites.
A. Lewis, “GetDist: a Python package for analysing Monte Carlo samples,” (2019), arXiv:1910.13970 [astro-ph, physics:physics]
Original
1910
Earlier work this paper cites.
S. Tsujikawa, “Quintessence: A Review,” (2013), arXiv:1304.1961 [astro-ph, physics:gr-qc, physics:hep-ph, physics:hep-th]
Original
1961
Earlier work this paper cites.
A. Gelman and D. B. Rubin, Statistical Science 7
1992
Earlier work this paper cites.
N. C. Tsamis and R. P. Woodard, Nucl. Phys. B 474
1996
Earlier work this paper cites.
V. F. Mukhanov, L. R. W. Abramo, and R. H. Brandenberger, Phys. Rev. Lett. 78
1997
Earlier work this paper cites.
A. Lewis, A. Challinor, and A. Lasenby, The Astrophysical Journal 538
2000
Earlier work this paper cites.
M. Chevallier and D. Polarski, International Journal of Modern Physics D 10
2001
Earlier work this paper cites.
X. Li and A. Shafieloo, The Astrophysical Journal 902
Original
2001
Earlier work this paper cites.
R. H. Brandenberger, in 18th IAP Colloquium on the Nature of Dark Energy: Observational and Theoretical Results on the Accelerating Universe (2002) arXiv:hep-th/0210165
2002
Earlier work this paper cites.
A. Lewis and S. Bridle, Physical Review D 66
2002
Earlier work this paper cites.
E. V. Linder, Physical Review Letters 90
2003
Earlier work this paper cites.
J. C. Hill, E. McDonough, M. W. Toomey, and S. Alexander, Phys. Rev. D 102
Original
2003
Earlier work this paper cites.
J. Torrado and A. Lewis, Journal of Cosmology and Astroparticle Physics 2021
Original
2005
Earlier work this paper cites.
M. M. Ivanov, E. McDonough, J. C. Hill, M. Simonović, M. W. Toomey, S. Alexander, and M. Zaldarriaga, Phys. Rev. D 102
Original
2006
Earlier work this paper cites.
E. J. Copeland, M. Sami, and S. Tsujikawa, International Journal of Modern Physics D 15
2006
Earlier work this paper cites.
R. Trotta, Contemporary Physics 49
Original
2008
Earlier work this paper cites.
W. Fang, W. Hu, and A. Lewis, Physical Review D 78
Original
2008
Earlier work this paper cites.