期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 431, 期 1, 页码 923-929出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt220
关键词
cosmology: dark energy; cosmology: theory
资金
- CNPq
- FAPESP
- MEC
- FEDER
- CPAN
- Gen. de Catalunya [2009SGR502]
We propose a novel cosmological scenario with the space-time emerging from a pure initial de Sitter stage and subsequently evolving into the radiation, matter and dark energy dominated epochs, thereby avoiding the initial singularity and providing a complete description of the expansion history and a natural solution to the horizon problem. The model is based on a dynamical vacuum energy density which evolves as a power series of the Hubble rate. The transit from the inflation into the standard radiation epoch is universal, giving a clue for a successful description of the graceful exit. Since the resulting late time cosmic history is very close to the concordance Lambda cold dark matter model, the new unified framework embodies a more complete past cosmic evolution than the standard cosmology.
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