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Holographic Dark Matter Fluid in Late Time Universe
- Dr. Yun-Long ZHANG
We discuss a scenario that the dark matter fluid in late time universe emerges as part of the holographic stress-energy tensor on the hypersurface in higher dimensional flat spacetime. We construct a toy model with the Friedmann-Lemaitre-Robertson-Walker (FLRW) hypersurface as the holographic screen in the flat bulk. After adding the baryonic matter on the screen, we assume that both of the dark matter and dark energy can be described by the Brown-York stress-energy tensor. From the Hamiltonian constraint equation in the flat bulk, we find an interesting relation between the dark matter and baryonic matter's energy density parameters, by comparing with the Lambda cold dark matter parameterization. We further compare this holographic embedding of emergent dark matter with traditional braneworld scenario and present an alternative interpretation as the holographic universe, with the new parameterization of the Friedmann equation. [Ref: JHEP 1810 (2018) 009 [arXiv: 1712.09326v2]]