Brane tachyon dynamics

Abstract

The dynamics of a tachyon attached to a Dvali, Gabadadze and Porrati (DGP) brane is investigated. Exponential potential and inverse power law potential are explored, respectively. The quasi-attractor behavior, for which the universe will eventually go into a phase similar to the slow-roll inflation, is discovered in both cases of exponential potential and inverse power law potential. The equation of state (EOS) of the virtual dark energy for a single scalar can cross the phantom divide in the branch $\theta =-1$ for both potentials, while the EOS of the virtual dark energy for a single scalar can not cross this divide in the branch $\theta =1$.

20 pages, 12 figs, to appear in PLB

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• Bifurcation and Global Dynamical Behavior of the $f(T)$ Theory
• Dynamical System Analysis of Brane Induced Gravity with Tachyon Field
• K-Inflation in Noncommutative Space-Time
• A unified model of inflation and dark energy based on the holographic spacetime foam