Critical comments on the paper "Crossing $\omega =-1$ by a single scalar field on a Dvali-Gabadadze-Porrati brane" by H Zhang and Z-H Zhu [Phys.Rev.D75,023510(2007)]

Abstract

It is demonstrated that the claim in the paper "Crossing $\omega =-1$ by a single scalar field on a Dvali-Gabadadze-Porrati brane" by H Zhang and Z-H Zhu [Phys.Rev.D75,023510(2007)], about a prove that there do not exist scaling solutions in a universe with dust in a Dvali-Gabadadze-Porrati (DGP) braneworld scenario, is incorrect.

5 pages, 8 eps figures

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• Constraints on the Sound Speed of Dynamical Dark Energy
• Holographic dark energy in a cyclic universe
• Reconstruction of Hessence Dark Energy and the Latest Type Ia Supernovae Gold Dataset
• Inflationary universe in loop quantum cosmology
• Analytic spectrum of relic gravitational waves modified by neutrino free streaming and dark energy
• Possible theoretical limits on holographic quintessence from weak gravity conjecture
• Holographic hessence models
• Dynamics of Quintom and Hessence Energies in Loop Quantum Cosmology
• Chaplygin DGP cosmologies
• Exact models with non-minimal interaction between dark matter and (either phantom or quintessence) dark energy
• Dynamics of holographic vacuum energy in the DGP model
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• Null Energy Condition and Dark Energy Models
• Bouncing Universe with Non-minimally Coupled Quintom Matter
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• From thermodynamics to the solutions in gravity theory
• New mechanism to cross the phantom divide
• Dynamical-Screening and the Phantom-Like Effects in a DGP-Inspired $F(R,\varphi )$ Model
• Stability analysis of the cosmological solutions with induced gravity and scalar field on the brane
• Holographic dark energy and validity of the generalized second law of thermodynamics in the dgp brane world
• Cosmological Model of Interacting Tachyon Field
• A Lorentz Invariance Violating Cosmology on the DGP Brane
• Dynamical System Analysis of Randall-Sundrum Model with Tachyon Field on the Brane