Probing the coupling between dark components of the universe

By Zongkuan Guo, N. Ohta, S. Tsujikawa. 2007

337 citations recorded by the source corpus.

We place observational constraints on a coupling between dark energy and dark matter by using 71 Type Ia supernovae (SNe Ia) from the first year of the five-year Supernova Legacy Survey (SNLS), the cosmic microwave background (CMB) shift parameter from the three-year Wilkinson Microwave Anisotropy Probe (WMAP), and the baryon acoustic oscillation (BAO) peak found in the Sloan Digital Sky Survey (SDSS). The interactions we study are (i) constant coupling $\ensuremath{\delta}$ and (ii) varying coupling $\ensuremath{\delta}(z)$ that depends on a redshift $z$, both of which have simple parametrizations of the Hubble parameter to confront with observational data. We find that the combination of the three databases marginalized over a present dark energy density gives stringent constraints on the coupling, $\ensuremath{-}0.08l\ensuremath{\delta}l0.03$ (95% C.L.) in the constant coupling model and $\ensuremath{-}0.4l{\ensuremath{\delta}}_{0}l0.1$ (95% C.L.) in the varying coupling model, where ${\ensuremath{\delta}}_{0}$ is a present value. The uncoupled $\ensuremath{\Lambda}\mathrm{CDM}$ model (${w}_{X}=\ensuremath{-}1$ and $\ensuremath{\delta}=0$) still remains a good fit to the data, but the negative coupling ($\ensuremath{\delta}l0$) with the equation of state of dark energy ${w}_{X}l\ensuremath{-}1$ is slightly favored over the $\ensuremath{\Lambda}\mathrm{CDM}$ model.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/74562ce09159f169f6f284c1825cda07adc5a6ce

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Citations in the corpus

The growth of structure in interacting dark energy models (2009, neutral): “[7–28]).”
Observational constraints on an interacting dark energy model (2009, neutral): “…Zimdahl & Pavon (2001); Farrar & Peebles (2004); Chimento et al. (2003); Olivares et al. (2005); Koivisto (2005); Sadjadi & Alimohammadi (2006); Guo et al. (2007); Boehmer et al. (2008); He & Wang (2008); Quartin et al. (2008); Pereira & Jesus (2009); Quercellini et al. (2008); Valiviita et…”
Statefinder diagnosis for the interacting model of holographic dark energy (2007, result): “In addition, the proposal of interacting dark energy is compatible with the current observations such as the SNIa and CMB data [ 26 ].”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “Various choices of couplings have been investigated in the literature, including constant β [45, 818, 47, 690, 557, 990, 992, 947] and varying couplings [102], with effects on Supernovæ, CMB and cross-correlation of the CMB and LSS [152, 62, 47, 59, 720, 711, 810].”