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We study a model of the emergent dark universe, which lives on the time-likehypersurface in a five-dimensional bulk spacetime. The holographic fluid on thehypersurface is assumed to play the role of the dark sector, mainly includingthe dark energy and apparent dark matter. Based on the modified Friedmannequations, we present a Markov-Chain-Monte-Carlo analysis with theobservational data, including type Ia Supernova and the direct measurement ofthe Hubble constant. We obtain a good fitting result and the matter componentturns out to be small enough, which matches well with our theoreticalassumption that only the normal matter is required. After considering thefitting parameters, an effective potential of the model with a dynamical scalarfield is reconstructed. The parameters in the swampland criteria are extracted,and they satisfy the criteria at the present epoch but are in tension with thecriteria if the potential is extended to the future direction. The method toreconstruct the potential is helpful to study the swampland criteria of othermodels without an explicit scalar field.

Emergent Dark Universe and the Swampland Criteria