A Phantom does not Result from a Backreaction

Abstract

The backreaction of nonlinear inhomogeneities to the cosmic expansion is analyzed in the framework of general relativity with a cosmological constant. By defining the spatially averaged matter energy density, we find that the cosmological constant induces a new type of backreaction whose equation of state is $p=-4/3\rho$, where $\rho$ and $p$ are the effective energy density and effective pressure of the backreaction in the averaged Friedmann universe. However, the effective density is negative, and thus it decreases the acceleration caused by the cosmological constant.

6pages, accepted by Progress of Theoretical Physics

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Cited by in corpus (10)

• The Viability of Phantom Dark Energy: A Brief Review
• Cosmological Backreaction from Perturbations
• On average properties of inhomogeneous fluids in general relativity III: general fluid cosmologies
• Systematic corrections to the measured cosmological constant as a result of local inhomogeneity
• Gauges and Cosmological Backreaction
• Averaging Robertson-Walker Cosmologies
• Backreaction: Gauge and Frame Dependences
• On the physical effects of consistent cosmological averaging
• Expansion and Growth of Structure Observables in a Macroscopic Gravity Averaged Universe
• Modified Averaging Processes in Cosmology and the Structured FRW model