Nonsingular models of universes in teleparallel theories
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Different models of universes are considered in the context of teleparallel theories. Assuming that the universe is filled by a fluid with an equation of state P ¼ f ð Þ , for different teleparallel theories and different equation of state we study its dynamics. Two particular cases are studied in detail: in the first one we consider a function f with two zeros (two de Sitter solutions) that mimics a huge cosmological constant at early times and a pressureless fluid at late times; in the second one, in the context of loop quantum cosmology with a small cosmological constant, we consider a pressureless fluid ( P ¼ 0 , f ð Þ¼ ) which means there are de Sitter and anti–de Sitter solutions. In both cases one obtains a nonsingular universe that at early times is in an inflationary phase; after leaving this phase, it passes trough a matter dominated phase and finally at late times it expands in an accelerated way
PACS Numbers: 04.50.Kd, 98.80.Jk
CitationHaro, J.; Amoros, J. Nonsingular models of universes in teleparallel theories. "Physical review letters", 14 Febrer 2013, vol. 110, núm. 7, p. 1-5.