Holographic Λ(t)CDM model in a non-flat universe

Abstract

The holographic $\Lambda (t)$CDM model in a non-flat universe is studied in this paper. In this model, to keep the form of the stress-energy of the vacuum required by general covariance, the holographic vacuum is enforced to exchange energy with dark matter. It is demonstrated that for the holographic model the best choice for the IR cutoff of the effective quantum field theory is the event horizon size of the universe. We derive the evolution equations of the holographic $\Lambda (t)$CDM model in a non-flat universe. We constrain the model by using the current observational data, including the 557 Union2 type Ia supernovae data, the cosmic microwave background anisotropy data from the 7-yr WMAP, and the baryon acoustic oscillation data from the SDSS. Our fit results show that the holographic $\Lambda (t)$CDM model tends to favor a spatially closed universe (the best-fit value of ${\Omega }_{k0}$ is -0.042), and the 95% confidence level range for the spatial curvature is $-0.101<{\Omega }_{k0}<0.040$. We show that the interaction between the holographic vacuum and dark matter induces an energy flow of which the direction is first from vacuum to dark matter and then from dark matter to vacuum. Thus, the holographic $\Lambda (t)$CDM model is just a time-varying vacuum energy scenario in which the interaction between vacuum and dark matter changes sign during the expansion of the universe.

8 pages, 4 figures. version for publication in EPJC. arXiv admin note: text overlap with arXiv:1112.2350

References in corpus (25)

• Dynamics of dark energy
• Dark Energy and the Accelerating Universe
• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• A Dark Energy Model Characterized by the Age of the Universe
• A New Model of Agegraphic Dark Energy
• A Holographic Dark Energy Model from Ricci Scalar Curvature
• Holographic dark energy models: A comparison from the latest observational data
• Constraints on Holographic Dark Energy from Latest Supernovae, Galaxy Clustering, and Cosmic Microwave Background Anisotropy Observations
• Dynamical vacuum energy, holographic quintom, and the reconstruction of scalar-field dark energy
• Holographic Ricci dark energy: Current observational constraints, quintom feature, and the reconstruction of scalar-field dark energy
• Reconstructing holographic quintessence
• Statefinder diagnosis for the interacting model of holographic dark energy
• Agegraphic dark energy as a quintessence
• Holographic tachyon model
• Some Issues Concerning Holographic Dark Energy
• Constraints on holographic dark energy models using the differential ages of passively evolving galaxies
• Holographic dark energy in a cyclic universe
• Inflation with Holographic Dark Energy
• Observational constraints on late-time Lambda(t) cosmology
• Possible theoretical limits on holographic quintessence from weak gravity conjecture
• Holographic Ricci dark energy in Randall-Sundrum braneworld: Avoidance of big rip and steady state future
• Holographic Gas as Dark Energy
• Dynamics of holographic vacuum energy in the DGP model
• $\Lambda (t)$CDM Model as a Unified Origin of Holographic and Agegraphic Dark Energy Models

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