| Journal: | Brazilian journal of physics |
| Database: | PERIÓDICA |
| System number: | 000408734 |
| ISSN: | 0103-9733 |
| Authors: | Alcaniz, J.S1 |
| Institutions: | 1Ministerio da Ciencia e Tecnologia, Observatorio Nacional, Rio de Janeiro. Brasil |
| Year: | 2006 |
| Season: | Dic |
| Volumen: | 36 |
| Number: | 4A |
| Pages: | 1109-1117 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, analítico |
| English abstract | The high-quality cosmological data, which became available in the last decade, have thrusted upon us a rather preposterous composition for the universe which poses one of the greatest challenges theoretical physics has ever faced: the so-called dark energy. By focusing our attention on specific examples of dark energy scenarios, we discuss three different candidates for this dark component, namely, a decaying vacuum energy or time-varying cosmological constant [Λ(t)], a rolling homogeneous quintessence field (Φ), and modifications in gravity due to extra spatial dimensions. As discussed, all these candidates [along with the vacuum energy or cosmological constant (Λ)] seem somewhat to be able to explain the current observational results, which hampers any definitive conclusion on the actual nature of the dark energy |
| Disciplines: | Física y astronomía |
| Keyword: | Astronomía, Física, Física de partículas y campos cuánticos, Astrofísica, Cosmología, Energía oscura, Relatividad general, Constante cosmológica |
| Keyword: | Physics and astronomy, Astronomy, Particle physics and quantum fields, Physics, Astrophysics, Cosmology, Dark energy, General relativity, Cosmological constant |
| Full text: | Texto completo (Ver PDF) |
