2003/06/02 by Tomohiro Inagaki, Inagaki, Tomohiro, Xinhe Meng +3
Physics and Astronomy · #Astrophysics (astro-ph) #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Relativity and Gravitational Theory #astro-ph #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0306010
8 pages, 5 figures
openalex publication_date 2003/06/02 · arxiv created 2003/06/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Cosmology enters precision testing period with the observational experiments advancement. We have not arrived to decipher the origin of the dominant dark energy component of our universe, although we have located some of its characters. In such a situation the possibilities of a simple four-fermion interaction model are investigated to describe dark energy characters. We explicitly calculate the vacuum expectation value of the energy-momentum tensor and discuss the results with comparison to the equation of state for dark energy requirement. It is found that the negative pressure is realized at low temperature. It is an appropriate property as a dark energy candidate. We also investigate some cosmological tests for the dark energy via its equation of state.