Reconstructing k-essence

2005/12/31 by A. A. Sen, A A Sen · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Particle physics theoretical and experimental studies #astro-ph

paper · pdf · doi:10.1088/1475-7516/2006/03/010

published as JCAP 0603:010,2006 · Corrections in Figure 2 and 3, new references added, no major change, conclusion remains the same. Accepted in JCAP

arxiv created 2006/02/28 · openalex publication_date 2006/03/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

We present a model independent method of reconstructing the Lagrangian for the k-essence field driving the present acceleration of the universe. We consider the simplest k-essence model for which the potential is constant. Later we use three parametrizations for the Hubble parameter H ( z ), consistent with recent the SN1a data, to yield the Lagrangian F . Our reconstruction program does not generate any physically realistic Lagrangian for models that allow phantom crossing, whereas models without phantom crossing yield well behaved Lagrangians.

Citations

• Determining the equation of state of the expanding Universe: inverse problem in cosmology
• Prospects for probing the dark energy via supernova distance measurements
• Cosmological Constant - the Weight of the Vacuum
• Statefinder -- a new geometrical diagnostic of dark energy
• How to determine an effective potential for a variable cosmological term
• Cosmological parameter analysis including SDSS Lyαforest and galaxy bias: Constraints on the primordial spectrum of fluctuations, neutrino mass, and dark energy
• Accelerating Universes with Scaling Dark Matter
• Cosmological consequences of a rolling homogeneous scalar field
• k-Inflation

Cited by

• k-Essence, superluminal propagation, causality and emergent geometry