A Unified Model of Phantom Energy and Dark Matter
Abstract
To explain the acceleration of the cosmological expansion researchers have considered an unusual form of mass-energy generically called dark energy. Dark energy has a ratio of pressure over mass density which obeys w = p/ρ < -1/3. This form of mass-energy leads to accelerated expansion. An extreme form of dark energy, called phantom energy, has been proposed which has w = p/ρ < -1. This possibility is favored by the observational data. The simplest model for phantom energy involves the introduction of a scalar field with a negative kinetic energy term. Here we show that theories based on graded Lie algebras naturally have such a negative kinetic energy and thus give a model for phantom energy in a less ad hoc manner. We find that the model also contains ordinary scalar fields and anti-commuting (Grassmann) vector fields which act as a form of two component dark matter. Thus from a gauge theory based o!
n a graded algebra we naturally obtained both phantom energy and dark matter.- Publication:
-
SIGMA
- Pub Date:
- January 2008
- DOI:
- 10.3842/SIGMA.2008.009
- arXiv:
- arXiv:0801.4728
- Bibcode:
- 2008SIGMA...4..009C
- Keywords:
-
- dark energy;
- phantom energy;
- graded algebras;
- High Energy Physics - Theory;
- General Relativity and Quantum Cosmology
- E-Print:
- This is a contribution to the Proc. of the Seventh International Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007, Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/