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A New Model of Agegraphic Dark Energy
In this note, we propose a new model of agegraphic dark energy based on the
K\'{a}rolyh\'{a}zy relation, where the time scale is chosen to be the conformal
time of the Friedmann-Robertson-Walker (FRW) universe. We find that in
the radiation-dominated epoch, the equation-of-state parameter of the new
agegraphic dark energy whereas ; in the
matter-dominated epoch, whereas ; eventually, the
new agegraphic dark energy dominates; in the late time when
, and the new agegraphic dark energy mimics a cosmological
constant. In every stage, all things are consistent. The confusion in the
original agegraphic dark energy model proposed in arXiv:0707.4049 disappears in
this new model. Furthermore, is naturally satisfied in both
radiation-dominated and matter-dominated epochs where . In addition, we
further extend the new agegraphic dark energy model by including the
interaction between the new agegraphic dark energy and background matter. In
this case, we find that can cross the phantom divide.Comment: 8 pages, revtex4; v2: Phys. Lett. B in press; v3: published versio
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