Double-Kasner spacetime: Peculiar velocities and cosmic jets
2011 (English)In: Physical Review D, ISSN 1550-7998, Vol. 83, no 12, 124029- p.Article in journal (Refereed) Published
In dynamic spacetimes in which asymmetric gravitational collapse/expansion is taking place, the timelike geodesic equation appears to exhibit an interesting property: Relative to the collapsing configuration, free test particles undergo gravitational acceleration and form a double-jet configuration parallel to the axis of collapse. We illustrate this aspect of peculiar motion in simple spatially homogeneous cosmological models such as the Kasner spacetime. To estimate the effect of spatial inhomogeneities on cosmic jets, timelike geodesics in the Ricci-flat double-Kasner spacetime are studied in detail. While spatial inhomogeneities can significantly modify the structure of cosmic jets, we find that under favorable conditions the double-jet pattern can initially persist over a finite period of time for sufficiently small inhomogeneities.
Place, publisher, year, edition, pages
2011. Vol. 83, no 12, 124029- p.
IdentifiersURN: urn:nbn:se:su:diva-67552DOI: 10.1103/PhysRevD.83.124029ISI: 000291799800002OAI: oai:DiVA.org:su-67552DiVA: diva2:470764
authorCount :32011-12-292011-12-292011-12-29Bibliographically approved