CAN w < -1 BE EXORCIZED?
| Autor: | Pedro F. González-Díaz |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | International Journal of Modern Physics D. 14:1313-1320 |
| ISSN: | 1793-6594 0218-2718 |
| DOI: | 10.1142/s0218271805006973 |
| Popis: | Dimming mechanisms based on the conversion of photons into axions have been recently suggested which could justify the observation of equation of state values w = P/ρ less than -1 that do not correspond to the presence of phantom energy in the universe. It is argued that, though such a mechanism may in fact increase the actual value of w, it does not actually solve the phantom problem because the produced axions precisely are of the kind which has been considered to make up phantom energy and therefore the suggested mechanism can never make the actual value of w to exactly reach the value -1 from below, such as it also happens with other suggested mechanisms intended to get rid of phantoms from cosmology. It is conjectured that the actual current value of w must likely be less than -1 but so close to it that present observational accuracies could not allow discriminating between a cosmological constant and the phantom energy as the form currently taken by dark energy in the universe. |
| Databáze: | OpenAIRE |
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