Holographic Dark Energy Holographic Dark Energy Model Dark energy density is given by the vacuum energy density caused via quantum fluctuation Pde=3 2M2L-2 L Characteristic length scale of universe Model parameter MP Reduced Planck mass Choosing different characteristic length scale L Various Holographic Dark Energy Models Review see: M. Li, X.-D. Li, S. Wang, Y Wang, CTP. 56, 525-604 (2011)[arXiv: 1103. 5870] M. Li, Phys. Lett. B 603, 1(2004) [arXiv: hep-th/0403127] R-G Cai, Phys. Lett. B 657, 228-231(2007) [arXiv: 0707 4049 [hep-th]lHolographic Dark Energy Holographic Dark Energy Model: Dark energy density is given by the vacuum energy density caused via quantum fluctuation Characteristic length scale of universe Choosing different characteristic length scale L → Various Holographic Dark Energy Models Review see: M. Li, X. -D. Li, S. Wang, Y. Wang, CTP. 56, 525-604 (2011) [arXiv:1103.5870]. M. Li, Phys. Lett. B 603, 1 (2004) [arXiv:hep-th/0403127]. R. -G. Cai, Phys. Lett. B 657, 228-231 (2007) [arXiv:0707.4049 [hep-th]]. Model parameter Reduced Planck mass