TY - JOUR
T1 - Can cosmic parallax distinguish between anisotropic cosmologies?
AU - Fontanini, Michele
AU - West, Eric J.
AU - Trodden, Mark
PY - 2009/12/11
Y1 - 2009/12/11
N2 - In an anisotropic universe, observers not positioned at a point of special symmetry should observe cosmic parallax-the relative angular motion of test galaxies over cosmic time. It was recently argued that the nonobservance of this effect in upcoming precision astrometry missions such as GAIA may be used to place strong bounds on the position of off-center observers in a void-model universe described by the Lemaitre-Tolman-Bondi metric. We consider the analogous effect in anisotropic cosmological models described by an axisymmetric homogeneous Bianchi type I metric and discuss whether any observation of cosmic parallax would distinguish between different anisotropic evolutions.
AB - In an anisotropic universe, observers not positioned at a point of special symmetry should observe cosmic parallax-the relative angular motion of test galaxies over cosmic time. It was recently argued that the nonobservance of this effect in upcoming precision astrometry missions such as GAIA may be used to place strong bounds on the position of off-center observers in a void-model universe described by the Lemaitre-Tolman-Bondi metric. We consider the analogous effect in anisotropic cosmological models described by an axisymmetric homogeneous Bianchi type I metric and discuss whether any observation of cosmic parallax would distinguish between different anisotropic evolutions.
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U2 - 10.1103/PhysRevD.80.123515
DO - 10.1103/PhysRevD.80.123515
M3 - Article
AN - SCOPUS:73349083952
SN - 1550-7998
VL - 80
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
M1 - 123515
ER -