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 -