COSMIC CONSTRAINTS ON HOLOGRAPHIC DARK ENERGY IN BRANS-DICKE THEORY VIA MARKOV-CHAIN MONTE-CARLO METHOD

In this paper,the holographic dark energy in Brans-Dicke theory is confronted by cosmic observations from SN Ia, BAO, OHD and CMB via Markov-Chain Monte-Carlo (MCMC) method. The best fit parameters are found in 1 sigma region: Omega(h0) = 0.725(-0.0330)(+0.0268), c = 0.807(-0.160)(+0.165), H-0 = 70.436(-3.0743)(+3.245) and alpha = 0.00248(-0.00609)(+0.00549) (equivalently omega = 2415.653 which is less than the solar system bound and consistent with other constraint results). With these best fit values of the parameters, it is found that the universe is undergoing accelerated expansion,and the current value of equation of state of holographic dark energy w(h0) = -1.0376(-0.121)(+0.129) which is phantom like in Brans-Dicke theory. The effective Newton's constant decreases with the expansion of our universe for the negative value of model parameter alpha.