1210.0966 (Miao Li et al.)
Miao Li, Rong-Xin Miao
A new model of holographic dark energy with action principle is proposed. It is the first time that one can derive a HDE model from the action principle. Besides, the puzzles of causality and circular logic about HDE have been completely solved. In this model, the evolution of universe only depends on the present state of universe, which clearly show that it obeys the law of causality. Furthermore, the use of future event horizon as a present cutoff is not an input but automatically follows from the equations of motion. Interestingly, this new model is very similar to the initial one of Li except a new term which may be explained as dark radiation.
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http://arxiv.org/abs/1210.0966
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