2008/01/30 by Max Chaves, Douglas Singleton
Physics and Astronomy · #Advanced Differential Geometry Research #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #gr-qc #hep-th
paper · pdf · doi:10.3842/sigma.2008.009
published as SIGMA 4:009,2008 · 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/
arxiv created 2008/01/30 · openalex publication_date 2008/01/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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/ < -1/3. This form of massenergy leads to accelerated expansion. An extreme form of dark energy, called phantom energy, has been proposed which has w = p/ < -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 on a graded algebra we naturally obtained both phantom energy and dark matter.