Nonsingular models of universes in teleparallel theories

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=-ρ-f(ρ), for different teleparallel theories and different equation of state we study its dynamics. Two particular cases are studied in de...

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Bibliographic Details
Published in:Physical review letters 2013-02, Vol.110 (7), p.071104-071104, Article 071104
Main Authors: de Haro, Jaume, Amoros, Jaume
Format: Article
Language:English
Subjects:
Cosmologia
Cosmological constants
Cosmology
Equation of state
Loop quantum cosmologies
Matemàtiques i estadística
Nonsingular
Pressureless
Teleparallel theory
Àrees temàtiques de la UPC
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Summary: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=-ρ-f(ρ), 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=0⇔f(ρ)=-ρ) 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.110.071104