New generic evolution for $k$ essence dark energy with $w\approx 1$
Abstract
We reexamine kessence dark energy models with a scalar field Φ and a factorized Lagrangian, L = V (φ)F(X), with X = $$1\over{2}$$∇_{µ}Φ∇^{µ}Φ. A value of the equation of state parameter, w, near 1 requires either X ≈ 0 or dF/dX ≈ 0. Previous work showed that thawing models with X ≈ 0 evolve along a set of unique trajectories for w(a), while those with dF/dX ≈ 0 can result in a variety of different forms for w(a). We show that if dV /dΦ is small and (1/V )(dV /dΦ) is roughly constant, then the latter models also converge toward a single unique set of behaviors for w(a), different from those with X ≈ 0. We derive the functional form for w(a) in this case, determine the conditions on V (Φ) for which it applies, and present observational constraints on this new class of models. We note that kessence models with dF/dX ≈ 0 correspond to a dark energy sound speed c$$2\atop{s}$$ ≈ 0.
 Authors:

 Univ. of Pennsylvania, Philadelphia, PA (United States)
 Vanderbilt Univ., Nashville, TN (United States)
 Publication Date:
 Research Org.:
 Vanderbilt Univ., Nashville, TN (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), High Energy Physics (HEP)
 OSTI Identifier:
 1599595
 Alternate Identifier(s):
 OSTI ID: 1546489
 Grant/Contract Number:
 SC0019207
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review D
 Additional Journal Information:
 Journal Volume: 100; Journal Issue: 2; Journal ID: ISSN 24700010
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; dark energy; kessence; scalar fields
Citation Formats
Kehayias, John, and Scherrer, Robert J. New generic evolution for k essence dark energy with w≈1. United States: N. p., 2019.
Web. doi:10.1103/PhysRevD.100.023525.
Kehayias, John, & Scherrer, Robert J. New generic evolution for k essence dark energy with w≈1. United States. https://doi.org/10.1103/PhysRevD.100.023525
Kehayias, John, and Scherrer, Robert J. Thu .
"New generic evolution for k essence dark energy with w≈1". United States. https://doi.org/10.1103/PhysRevD.100.023525. https://www.osti.gov/servlets/purl/1599595.
@article{osti_1599595,
title = {New generic evolution for k essence dark energy with w≈1},
author = {Kehayias, John and Scherrer, Robert J.},
abstractNote = {We reexamine kessence dark energy models with a scalar field Φ and a factorized Lagrangian, L = V (φ)F(X), with X = $1\over{2}$∇µΦ∇µΦ. A value of the equation of state parameter, w, near 1 requires either X ≈ 0 or dF/dX ≈ 0. Previous work showed that thawing models with X ≈ 0 evolve along a set of unique trajectories for w(a), while those with dF/dX ≈ 0 can result in a variety of different forms for w(a). We show that if dV /dΦ is small and (1/V )(dV /dΦ) is roughly constant, then the latter models also converge toward a single unique set of behaviors for w(a), different from those with X ≈ 0. We derive the functional form for w(a) in this case, determine the conditions on V (Φ) for which it applies, and present observational constraints on this new class of models. We note that kessence models with dF/dX ≈ 0 correspond to a dark energy sound speed c$2\atop{s}$ ≈ 0.},
doi = {10.1103/PhysRevD.100.023525},
journal = {Physical Review D},
number = 2,
volume = 100,
place = {United States},
year = {2019},
month = {7}
}
Web of Science
Figures / Tables:
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