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EnglishThe cosmological constant has attained a leading role in recent researches in cosmology. We extend the cosmic no-hair theorem to non-minimally coupled theories of gravity where ordinary matter is also present in the form of a perfect fluid. To achieve this goal we give a set of conditions for obtaining de Sitter expansion independently of any initial data (no fine-tuning problem), that is, we introduce a time-dependent (effective) cosmological constant. Finally, we apply the results to some specific models.
| Titolo: | A possible way to define an effective cosmological constant in scalar-tensor cosmologies | |
| Autori: | ||
| Data di pubblicazione: | 2000 | |
| Abstract: | The cosmological constant has attained a leading role in recent researches in cosmology. We extend the cosmic no-hair theorem to non-minimally coupled theories of gravity where ordinary matter is also present in the form of a perfect fluid. To achieve this goal we give a set of conditions for obtaining de Sitter expansion independently of any initial data (no fine-tuning problem), that is, we introduce a time-dependent (effective) cosmological constant. Finally, we apply the results to some specific models. | |
| Handle: | http://hdl.handle.net/11588/192794 | |
| ISBN: | 8847000688 | |
| Appare nelle tipologie: | 4.1 Articoli in Atti di convegno |
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