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It is shown that the first law of thermodynamics and the holographicprinciple applied to an arbitrary large cosmic causal horizon naturally demandthe zero cosmological constant and non-zero dynamical dark energy in the formof the holographic dark energy. Semiclassical analysis shows that theholographic dark energy has a parameter $d=1$ and an equation of statecomparable to current observational data, if the entropy of the horizonsaturates the Bekenstein-Hawking bound. This result indicates that quantumfield theory should be modified at large scale to explain dark energy. Therelations among dark energy, quantum vacuum energy and entropic gravity arealso discussed.

Zero Cosmological Constant and Nonzero Dark Energy from Holographic Principle