Dark energy: Vacuum fluctuations, the effective phantom phase, and holography
- Consejo Superior de Investigaciones Cientificas (ICE/CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), Campus UAB, Faculty Ciencies, Torre C5-Par-2a pl, E-08193 Bellaterra, Barcelona (Spain)
- Department of Applied Physics, National Defence Academy, Hashirimizu Yokosuka 239-8686 (Japan)
- Institucio Catalana de Recerca i Estudis Avancats (ICREA) and Institut d'Estudis Espacials de Catalunya (IEEC/ICE), Edifici Nexus, Gran Capita 2-4, 08034 Barcelona (Spain)
- Physics Department, Nankai University, Tianjin, 300071 (China)
We aim at the construction of dark energy models without exotic matter but with a phantomlike equation of state (an effective phantom phase). The first model we consider is decaying vacuum cosmology where the fluctuations of the vacuum are taken into account. In this case, the phantom cosmology (with an effective, observational {omega} being less than -1 ) emerges even for the case of a real dark energy with a physical equation of state parameter {omega} larger than -1. The second proposal is a generalized holographic model, which is produced by the presence of an infrared cutoff. It also leads to an effective phantom phase, which is not a transient one as in the first model. However, we show that quantum effects are able to prevent its evolution towards a big rip singularity.
- OSTI ID:
- 20709245
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 10; Other Information: DOI: 10.1103/PhysRevD.71.103504; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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