TY - JOUR
T1 - Emerging universe from scale invariance
AU - Campo, Sergio Del
AU - Guendelman, Eduardo I.
AU - Herrera, Ramón
AU - Labraña, Pedro
PY - 2010
Y1 - 2010
N2 - We consider a scale invariant model which includes a R2 term in action and show that a stable "emerging universe" scenario is possible. The model belongs to the general class of theories, where an integration measure independent of the metric is introduced. To implement scale invariance (S.I.), a dilaton field is introduced. The integration of the equations of motion associated with the new measure gives rise to the spontaneous symmetry breaking (S.S.B) of S.I. After S.S.B. of S.I. in the model with the R2 term (and first order formalism applied), it is found that a non trivial potential for the dilaton is generated. The dynamics of the scalar field becomes non linear and these non linearities are instrumental in the stability of some of the emerging universe solutions, which exists for a parameter range of the theory.
AB - We consider a scale invariant model which includes a R2 term in action and show that a stable "emerging universe" scenario is possible. The model belongs to the general class of theories, where an integration measure independent of the metric is introduced. To implement scale invariance (S.I.), a dilaton field is introduced. The integration of the equations of motion associated with the new measure gives rise to the spontaneous symmetry breaking (S.S.B) of S.I. After S.S.B. of S.I. in the model with the R2 term (and first order formalism applied), it is found that a non trivial potential for the dilaton is generated. The dynamics of the scalar field becomes non linear and these non linearities are instrumental in the stability of some of the emerging universe solutions, which exists for a parameter range of the theory.
KW - cosmology of theories beyond the SM
KW - inflation
KW - initial conditions and eternal universe
KW - modified gravity
UR - http://www.scopus.com/inward/record.url?scp=77954053316&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2010/06/026
DO - 10.1088/1475-7516/2010/06/026
M3 - Article
AN - SCOPUS:77954053316
SN - 1475-7516
VL - 2010
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 6
M1 - 026
ER -