TY - JOUR
T1 - Classically and quantum stable emergent universe from conservation laws
AU - Del Campo, Sergio
AU - Guendelman, Eduardo I.
AU - Herrera, Ramón
AU - Labraña, Pedro
N1 - Funding Information:
This work was supported by Comision Nacional de Ciencias y Tecnologia through FONDECYT Grants 1110230 (SdC), 1130628 (RH). Also it was supported by Pontificia Universidad Catolica de Valparaiso through grants 123.787-2007 (SdC) and 123724 (RH). One of us (E.I.G) would like to thank the astrophysics and cosmology group at the Pontificia Universidad Catolica de Valparaiso and the Frankfurt Institute of Advanced Studies of Frankfurt University for hospitality. P.L. is supported by Direccion de Investigacion de la Universidad del Bio-Bio through Grants No 166907 2/R, and GI 150407/VC.
Publisher Copyright:
© 2016 IOP Publishing Ltd and Sissa Medialab srl .
PY - 2016/8/22
Y1 - 2016/8/22
N2 - It has been recently pointed out by Mithani-Vilenkin [1-4] that certain emergent universe scenarios which are classically stable are nevertheless unstable semiclassically to collapse. Here, we show that there is a class of emergent universes derived from scale invariant two measures theories with spontaneous symmetry breaking (s.s.b) of the scale invariance, which can have both classical stability and do not suffer the instability pointed out by Mithani-Vilenkin towards collapse. We find that this stability is due to the presence of a symmetry in the "emergent phase", which together with the non linearities of the theory, does not allow that the FLRW scale factor to be smaller that a certain minimum value a0 in a certain protected region.
AB - It has been recently pointed out by Mithani-Vilenkin [1-4] that certain emergent universe scenarios which are classically stable are nevertheless unstable semiclassically to collapse. Here, we show that there is a class of emergent universes derived from scale invariant two measures theories with spontaneous symmetry breaking (s.s.b) of the scale invariance, which can have both classical stability and do not suffer the instability pointed out by Mithani-Vilenkin towards collapse. We find that this stability is due to the presence of a symmetry in the "emergent phase", which together with the non linearities of the theory, does not allow that the FLRW scale factor to be smaller that a certain minimum value a0 in a certain protected region.
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=84984985804&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2016/08/049
DO - 10.1088/1475-7516/2016/08/049
M3 - Article
AN - SCOPUS:84984985804
VL - 2016
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 8
M1 - 049
ER -