Title: Emergent dark Universe 

Abstract:
We discuss a scenario that the dark matter in late universe emerges as part of the holographic stress-energy tensor on the hypersurface in higher dimensional flat bulk. We construct a toy model with a de Sitter hypersurface in flat spacetime. We find an interesting relation between the dark matter and baryonic matter density parameters, by using the Lambda cold dark matter parameterization. We further combine this holographic embedding of emergent dark matter with brane-world scenario and present a new parameterization for the Friedmann equation, which can be reduced to our toy constraint in the current universe. This model has the connection with the Verlinde's emergent gravity, where the dark matter is regarded as the elastic response of the baryonic matter on the de Sitter spacetime background.

Based on the modified Friedmann equations, we present a Markov-Chain-Monte-Carlo analysis with the observational data, including type Ia Supernova and the direct measurement of the Hubble constant. We obtain a good fitting result and the matter component turns out to be small enough, which matches well with our theoretical assumption that only the normal matter is required. Finally, we also comment on the parameters in the swampland criteria which can be extracted from our model.