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Interacting Energy Components and Observational $H(z)$ Data | Hao Wei
; Shuang Nan Zhang
; | Date: |
25 Apr 2007 | Subject: | Astrophysics (astro-ph) | Abstract: | In this note, we extend our previous work [Phys. Lett. B 644, 7 (2007),
astro-ph/0609597], and compare eleven interacting dark energy models with
different couplings to the observational $H(z)$ data. However, none of these
models is better than the simplest $Lambda$CDM model. This implies that either
more exotic couplings are needed in the cosmological models with interaction
between dark energy and dust matter or there is no interaction at all. In fact,
as shown in our previous work, the observational $H(z)$ data favors the models
which have an oscillating feature for both $H(z)$ and effective
equation-of-state parameter (EoS), with the effective EoS crossing -1 around
redshift $zsim 1.5$. Therefore, other physical mechanisms are need to produce
an oscillating feature for $H(z)$ which can also fit the observational $H(z)$
data fairly well. | Source: | arXiv, arxiv.0704.3330 | Services: | Forum | Review | PDF | Favorites |
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