skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Unparticle dark energy

Abstract

We examine a dark energy model where a scalar unparticle degree of freedom plays the role of quintessence. In particular, we study a model where the unparticle degree of freedom has a standard kinetic term and a simple mass potential, the evolution is slowly rolling and the field value is of the order of the unparticle energy scale ({lambda}{sub u}). We study how the evolution of w depends on the parameters B (a function of unparticle scaling dimension d{sub u}), the initial value of the field {phi}{sub i} (or equivalently, {lambda}{sub u}) and the present matter density {omega}{sub m0}. We use observational data from type Ia supernovae, baryon acoustic oscillations and the cosmic microwave background to constrain the model parameters and find that these models are not ruled out by the observational data. From a theoretical point of view, unparticle dark energy model is very attractive, since unparticles (being bound states of fundamental fermions) are protected from radiative corrections. Further, coupling of unparticles to the standard model fields can be arbitrarily suppressed by raising the fundamental energy scale M{sub F}, making the unparticle dark energy model free of most of the problems that plague conventional scalar field quintessence models.

Authors:
;  [1];  [2]
  1. HEPCOS, Department of Physics, SUNY at Buffalo, Buffalo, New York 14260-1500 (United States)
  2. Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States)
Publication Date:
OSTI Identifier:
21322696
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 80; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevD.80.063522; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARYONS; BOUND STATE; COUPLING; DEGREES OF FREEDOM; DENSITY; EVOLUTION; MASS; NONLUMINOUS MATTER; OSCILLATIONS; POTENTIALS; RADIATIVE CORRECTIONS; RELICT RADIATION; SCALAR FIELDS; STANDARD MODEL; SUPERNOVAE

Citation Formats

Dai, D.-C., Stojkovic, Dejan, and Dutta, Sourish. Unparticle dark energy. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.80.063522.
Dai, D.-C., Stojkovic, Dejan, & Dutta, Sourish. Unparticle dark energy. United States. doi:10.1103/PHYSREVD.80.063522.
Dai, D.-C., Stojkovic, Dejan, and Dutta, Sourish. Tue . "Unparticle dark energy". United States. doi:10.1103/PHYSREVD.80.063522.
@article{osti_21322696,
title = {Unparticle dark energy},
author = {Dai, D.-C. and Stojkovic, Dejan and Dutta, Sourish},
abstractNote = {We examine a dark energy model where a scalar unparticle degree of freedom plays the role of quintessence. In particular, we study a model where the unparticle degree of freedom has a standard kinetic term and a simple mass potential, the evolution is slowly rolling and the field value is of the order of the unparticle energy scale ({lambda}{sub u}). We study how the evolution of w depends on the parameters B (a function of unparticle scaling dimension d{sub u}), the initial value of the field {phi}{sub i} (or equivalently, {lambda}{sub u}) and the present matter density {omega}{sub m0}. We use observational data from type Ia supernovae, baryon acoustic oscillations and the cosmic microwave background to constrain the model parameters and find that these models are not ruled out by the observational data. From a theoretical point of view, unparticle dark energy model is very attractive, since unparticles (being bound states of fundamental fermions) are protected from radiative corrections. Further, coupling of unparticles to the standard model fields can be arbitrarily suppressed by raising the fundamental energy scale M{sub F}, making the unparticle dark energy model free of most of the problems that plague conventional scalar field quintessence models.},
doi = {10.1103/PHYSREVD.80.063522},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 6,
volume = 80,
place = {United States},
year = {2009},
month = {9}
}