publication . Article . Other literature type . Preprint . 2018

Large-scale stability and astronomical constraints for coupled dark-energy models

Yang, W; Pan, S; Barrow, John;
Open Access
  • Published: 26 Feb 2018 Journal: Physical Review D, volume 97 (issn: 2470-0010, eissn: 2470-0029, Copyright policy)
  • Publisher: American Physical Society (APS)
  • Country: United Kingdom
Abstract
We study large-scale inhomogeneous perturbations and instabilities of interacting dark energy (IDE) models. Past analysis of large-scale perturbative instabilities, has shown that we can only test IDE models with observational data when its parameter ranges are either $w_{x}\geq -1$ and $\xi \geq 0,$ or $w_{x}\leq -1~$ and $~\xi \leq 0$, where $w_{x}$ is the dark energy equation of state (EoS), and $\xi$ is a coupling parameter governing the strength and direction of the energy transfer. We show that by adding a factor $(1+w_{x})$ to the background energy transfer, the whole parameter space can be tested against all the data and thus, the instabilities in such i...
Subjects
free text keywords: Physics and Astronomy (miscellaneous), Physics, Dark energy, Cosmological constant, Quintessence, Perturbation theory (quantum mechanics), Equation of state, Coupling parameter, Particle physics, Hubble's law, symbols.namesake, symbols, Parameter space, Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
80 references, page 1 of 6

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1. Cosmic microwave background observations (CMB): We use CMB data from the Planck 2015 measurements [63, 64], where we combine the full likelihoods ClT T , ClEE , ClT E with low l polarization ClT E + ClEE + ClBB, which is notationally the same as the \PlanckTT, TE, EE + lowP" of ref. [64].

2. Supernovae Type Ia: Supernovae Type Ia are the rst geometric sample to infer the accelerating phase of the universe and so far serve as one of the best samples to analyze any dark-energy model. In this work we use the most latest SNIa sample known as Joint Light Curve Analysis (JLA) samples [65] comprising 740 data points in the redshift range 0:01 z 1:30.

3. Baryon acoustic oscillation (BAO) distance measurements: For this data set, we use four BAO points: the 6dF Galaxy Survey (6dFGS) measurement at ze = 0:106 [66], the Main Galaxy Sample of Data Release 7 of Sloan Digital Sky Survey (SDSS-MGS) at ze = 0:15 [67], and the CMASS and LOWZ samples from the latest Data Release 12 (DR12) of the Baryon Oscillation Spectroscopic Survey (BOSS) at ze = 0:57 [68] and ze = 0:32 [68].

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