publication . Preprint . Article . 2010

New mechanism to cross the phantom divide

Xin-Zhou Li; Hongsheng Zhang; Yunshuang Du;
Open Access English
  • Published: 25 Aug 2010
Abstract
Recently, type Ia supernovae data appear to support a dark energy whose equation of state $w$ crosses -1, which is a much more amazing problem than the acceleration of the universe. We show that it is possible for the equation of state to cross the phantom divide by a scalar field in the gravity with an additional inverse power-law term of Ricci scalar in the Lagrangian. The necessary and sufficient condition for a universe in which the dark energy can cross the phantom divide is obtained. Some analytical solutions with $w<-1$ or $w>-1$ are obtained. A minimal coupled scalar with different potentials, including quadratic, cubic, quantic, exponential and logarith...
Subjects
free text keywords: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology, High Energy Physics - Theory, Physics and Astronomy (miscellaneous), Engineering (miscellaneous), Scalar–tensor theory, Classical mechanics, Scalar field, Dark energy, Equation of state, Scalar (physics), Scalar curvature, Friedmann equations, symbols.namesake, symbols, Universe, media_common.quotation_subject, media_common, Mathematical physics, Physics
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