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28 March 2024
 
  » arxiv » arxiv.0704.3330

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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)
AbstractIn 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
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