Restrictions on purely kinetic k-essence

Abstract

We restrict purely kinetic k-essence. Assuming the equation of state is a power law of the kinetic energy: $w=w_0{X}^{\alpha }$, to obtain accelerated phases, we must have $\alpha >0$ as one of necessary conditions, constrained from the conditions for stability and causality, and the k-essence must behave like phantom. We also study the evolutions of the equation of state and the speed of sound with numerical simulation.

4 pages, 2 figures

References in corpus (18)

• Cosmological Evolution of a Quintom Model of Dark Energy
• A New Model of Agegraphic Dark Energy
• A Holographic Dark Energy Model from Ricci Scalar Curvature
• Kinetic k-essence and Quintessence
• On causality and superluminal behavior in classical field theories. Applications to k-essence theories and MOND-like theories of gravity
• No-go theorem for k-essence dark energy
• Gauge-invariant analysis of perturbations in Chaplygin gas unified models of dark matter and dark energy
• Unified Dark Matter in Scalar Field Cosmologies
• Causality and the speed of sound
• Crossing $w=-1$ by a single scalar on a Dvali-Gabadadze-Porrati brane
• 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)]
• A k-essence Model Of Inflation, Dark Matter and Dark Energy
• Slow-roll k-essence
• Attractor scenarios and superluminal signals in k-essence cosmology
• A note on perfect scalar fields
• Tracking quintessence and k-essence in a general cosmological background
• Geometrical diagnostic for purely kinetic k-essence dark energy
• Spatial Ricci scalar dark energy model

Cited by in corpus (6)

• Pure kinetic k-essence as the cosmic speed-up
• K-essence Models and Cosmic Acceleration in Generalized Teleparallel Gravity
• Dynamics of generalized tachyon field
• Viability of nonminimally coupled f (R) gravity
• The evolution of the power law k-essence cosmology
• Reconstruction of a kinetic k--essence Lagrangian from a modified of dark energy equation of state