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Semi-holographic universe
Authors:Hongsheng Zhang  Xin-Zhou Li  Hyerim Noh
Institution:1. Shanghai United Center for Astrophysics (SUCA), Shanghai Normal University, 100 Guilin Road, Shanghai 200234, PR China;2. Korea Astronomy and Space Science Institute, Daejeon 305-348, Republic of Korea
Abstract:By assuming that a dark component (dark energy) in the universe strictly obeys the holographic principle, that is, its entropy is one fourth of the apparent horizon, we find that the existence of the other dark component (dark matter) is compulsory, as a compensation of dark energy, based on the first law of thermodynamics. By using the method of dynamical system analysis, we find that there exists a stable dark energy-dark matter scaling solution at late time, which is helpful to solve the coincidence problem. For reasonable parameters, the deceleration parameter is well consistent with current observations.
Keywords:Holographic principle  Dark energy
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