TY - JOUR
T1 - On the stability of Jordan-Brans-Dicke static universe
AU - Del Campo, Sergio
AU - Herrera, Ramón
AU - Labrãa, Pedro
PY - 2009
Y1 - 2009
N2 - In this work we study the stability of the Jordan-Brans-Dicke (JBD) static universe. This is motivated by the possibility that the universe might have started out in an asymptotically JBD static state, in the context of the so called emergent universe scenario. We extent our previous results on stability of JBD static universe by considering spatially homogeneous Bianchi type IX anisotropic perturbation modes and by including more general perfect fluids. Contrary to general relativity, we have found that the JBD static universe, dominated by a standard perfect fluid, could be stable against isotropic and anisotropic perturbations. The implications of these results for the initial state of the universe and its pre-inflationary evolution are discussed.
AB - In this work we study the stability of the Jordan-Brans-Dicke (JBD) static universe. This is motivated by the possibility that the universe might have started out in an asymptotically JBD static state, in the context of the so called emergent universe scenario. We extent our previous results on stability of JBD static universe by considering spatially homogeneous Bianchi type IX anisotropic perturbation modes and by including more general perfect fluids. Contrary to general relativity, we have found that the JBD static universe, dominated by a standard perfect fluid, could be stable against isotropic and anisotropic perturbations. The implications of these results for the initial state of the universe and its pre-inflationary evolution are discussed.
KW - Modified gravity
KW - Physics of the early universe
UR - http://www.scopus.com/inward/record.url?scp=70350666245&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2009/07/006
DO - 10.1088/1475-7516/2009/07/006
M3 - Article
AN - SCOPUS:70350666245
VL - 2009
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 7
M1 - 006
ER -