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Analysis on a general class of holographic type dark energy models

Author:
Z. Huang   Y. Wu  


Journal:
Journal of Cosmology and Astroparticle Physics


Issue Date:
2012


Abstract(summary):

We present a detail analysis on a general class of holographic type dark energy models characterized by the length scale L = 1/a n(t)int 0tdt' a m(t'). We show that n ges 0 is required by the recent cosmic accelerated expansion of universe. In the early universe dominated by the constituent with constant equation of state w m, we have w de ges -1-2n/3 for n ges 0 and m < 0, and w de ges -(2/3)(n-m)+w m for n > m ges 0. The models with n > m ges 0 become single-parameter models like the LambdaCDM model due to the analytic feature Omega de ges d 2/4(2m+3w m+3) 2a 2(n-m) at radiation- and matter-dominated epoch. Whereas the cases n = m ges 0 should be abandoned as the dark energy cannot dominate the universe forever and there might be too large fraction of dark energy in early universe, and the cases m > n ges 0 are forbidden by the self-consistent requirement Omega de << 1 in the early universe. Thus a detailed study on the single-parameter models corresponding to cases n > m ges 0 is carried out by using recent observations. The best-fit analysis indicates that the conformal-age-like models with n = m+1, i.e. Lprop1/Ha in early universe, are more favored and also the models with smaller n for the given n-m are found to fit the observations better. The equation of state of the dark energy in models with n = m+1 > 0 transits from w de < -1 during inflation to w de > -1 in radiation- and matter-dominated epoch, and then back to w de < -1 eventually. The best-fit result of the case (n = 0, m = -1) which is so-called etaHDE model proposed in (Huang 2012) is the most favorable model and compatible with the LambdaCDM model.


Page:
035 (16 pp.)---035 (16 pp.)


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