Stability of phantomk-essence theories

2005/11/30 by L. Raul Abramo, Nelson Pinto-Neto · 2 citations
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Cosmology and Gravitation Theories #Quantum Mechanics and Applications #astro-ph #gr-qc #hep-th

paper · pdf · doi:10.1103/physrevd.73.063522

published as Phys.Rev.D73:063522,2006 · Replaced with accepted version (minor changes, 1 reference added). Revtex4, 4 pages (double column), 1 figure

openalex publication_date 2006/03/22 · arxiv created 2006/03/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We show that phantom dark energy, if it is described by a k-essence theory, has three fundamental problems: first, its Hamiltonian is unbounded from below. Second, classical stability precludes the equation of state from crossing the ``Lambda-barrier,'' w_\ensuremathΛ=\ensuremath-1. Finally, both the equation of state and the sound speed are unbounded---the first, from below, the second, from above---if the kinetic term is not bounded by dynamics.

Citations

• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Cosmological parameter analysis including SDSS Lyαforest and galaxy bias: Constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
• Kinetically driven quintessence
• Crossing the phantom divide: Dark energy internal degrees of freedom
• k-Inflation

Cited by

• w d =−1 in interacting quintessence model
• k-Essence, superluminal propagation, causality and emergent geometry