http://arxiv.org/abs/1505.03436
Thusfar, there does not appear to be an agreed definition of homogeneous dark energy (DE). In this work, we argue that a correct definition of homogeneous DE is one whose density perturbation in comoving gauge vanishes. Using different DE models, we then investigate the consequence of this approach in the power spectrum — with all the power spectra being normalized to match each other on small scales, at z = 0. We find that on super-Hubble scales, relativistic corrections in the observed galaxy power spectrum are able to distinguish a homogeneous DE from the concordance model and from a clustering DE, at low z and for high magnification bias. However, the matter power spectrum: is incapable of distinguishing a homogeneous DE from the concordance model (on all scales), at z = 0; but is able to differentiate it from a clustering DE, particularly at low z. Moreover, we found that relativistic effects become enhanced with decreasing magnification bias, and with increasing z.
D. Duniya
Thu, 14 May 15
25/57
Comments: 10 pages, 6 figures. Submitted to Physical Review D
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