The Phantom of the OPRA

Abstract

The Observed Perlmutter-Riess Acceleration (OPRA) implies that the expansion of the Universe is currently increasing and is motivation for the so-called phantom energy models. We consider the dynamics of phantom scalar field models. An important physical time constraint, which can be used to rule out many cosmological models, is obtained from the condition that all forms of energy density, including the field causing OPRA (e.g., the phantom field), must be non-negligible for an extended period, which is conservatively estimated to be of the order of a few $Gyr$. We find that this physical time constraint cannot be satisfied in conventional phantom cosmological models.

arXiv comment9 pages; 1 figure

References in corpus (4)

• A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state
• Cosmological Evolution of a Quintom Model of Dark Energy
• Uncorrelated Estimates of Dark Energy Evolution
• Attractor Solution of Phantom Field

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• Singularities in and Stability of Ooguri-Vafa-Verlinde Cosmologies