Impact of theoretical priors in cosmological analyses: the case of single field quintessence - INSPIRE

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Impact of theoretical priors in cosmological analyses: the case of single field quintessence

Simone Peirone
(
- Leiden U.
)
,
Matteo Martinelli
(
- Leiden U.
)
,
Marco Raveri
(
- Leiden U. and
- Chicago U., EFI and
- Chicago U., KICP
)
,
Alessandra Silvestri
(
- Leiden U.
)

Feb 21, 2017

7 pages

Published in:

Phys.Rev.D 96 (2017) 6, 063524

Published: Sep 26, 2017

e-Print:

1702.06526 [astro-ph.CO]

DOI:

10.1103/PhysRevD.96.063524

View in:

ADS Abstract Service

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Abstract: (APS)

We investigate the impact of general conditions of theoretical stability and cosmological viability on dynamical dark energy models. As a powerful example, we study whether minimally coupled, single field quintessence models that are safe from ghost instabilities, can source the Chevallier-Polarski-Linder (CPL) expansion history recently shown to be mildly favored by a combination of cosmic microwave background (Planck) and weak lensing (KiDS) data. We find that in their most conservative form, the theoretical conditions impact the analysis in such a way that smooth single field quintessence becomes significantly disfavored with respect to the standard ΛCDM cosmological model. This is due to the fact that these conditions cut a significant portion of the (w0,wa) parameter space for CPL, in particular, eliminating the region that would be favored by weak lensing data. Within the scenario of a smooth dynamical dark energy parametrized with CPL, weak lensing data favors a region that would require multiple fields to ensure gravitational stability.

Note:

7 pages, 4 figures

gravitation: stability
coupling: minimal
quintessence
statistical analysis
gravitation: lens
cosmological model
dark energy
cosmic background radiation
conservation law
multiple field

References(40)

Figures(4)

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