Tale of stable interacting dark energy, observational signatures, and the H0 tension
By Weiqiang Yang, Supriya Pan, E. di Valentino, Rafael C. Nunes, S. Vagnozzi, D. Mota. Journal of Cosmology and Astroparticle Physics, 2018
329 citations recorded by the source corpus.
We investigate the observational consequences of a novel class of stable interacting dark energy (IDE) models, featuring interactions between dark matter (DM) and dark energy (DE). In the first part of our work, we start by considering two IDE models which are known to present early-time linear perturbation instabilities. Applying a transformation depending on the dark energy equation of state (EoS) to the DM-DE coupling, we then obtain two novel stable IDE models. Subsequently, we derive robust and accurate constraints on the parameters of these models, assuming a constant EoS wx for the DE fluid, in light of some of the most recent publicly available cosmological data. These include Cosmic Microwave Background (CMB) temperature and polarization anisotropy measurements from the Planck satellite, a selection of Baryon Acoustic Oscillation measurements, Supernovae Type-Ia luminosity distance measurements from the JLA sample, and measurements of the Hubble parameter up to redshift 2 from cosmic chronometers. Our analysis displays a mild preference for the DE fluid residing in the phantom region (wx<−1), with significance up to 95% confidence level, while we obtain new upper limits on the coupling parameter between the dark components. The preference for a phantom DE suggests a coupling function 0Q<, thus a scenario where energy flows from the DE to the DM . We also examine the possibility of addressing the H0 and σ8 tensions, finding that only the former can be partially alleviated. Finally, we perform a Bayesian model comparison analysis to quantify the possible preference for the two IDE models against the standard concordance ΛCDM model, finding that the latter is always preferred with the strength of the evidence ranging from positive to very strong.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/56310039dd0476553de554ba2cfd530e97dc723c
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In Astronomy and Astrophysics
- Michele Moresco
- A. Cimatti
- L. Verde
- L. Pozzetti
- Supriya Pan
- Raul Jimenez
- E. di Valentino
- S. Vagnozzi
In Nuclear and High Energy Physics
Citations in the corpus
- Setting the Stage for Cosmic Chronometers. II. Impact of Stellar Population Synthesis Models Systematics and Full Covariance Matrix (2020, background): “…2018; Lin et al. 2019), to explore a possible time evolution of the dark energy equation-of-state parameter (Moresco et al. 2016a; Zhao et al. 2017; Yang et al. 2018), and, more recently, also in the context of the Hubble constant controversy (Verde et al. 2019) to provide an independent…”
- Interacting dark energy with time varying equation of state and the H0 tension (2018, background): “Different aspects of interacting dark energy have been investigated from recent observations in [12, 13, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32].”