Τίτλος:
Mirage effects on the brane
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
We discuss features of the brane cosmological evolution that arise
through the presence of matter in the bulk. As these deviations from the
conventional evolution are not associated with some observable matter
component on the brane, we characterize them as mirage effects. We
review an example of expansion that can be attributed to mirage
nonrelativistic matter (mirage cold dark matter) on the brane. The real
source of the evolution is an anisotropic bulk fluid with negative
pressure along the extra dimension. We also study the general problem of
exchange of real nonrelativistic matter between the brane and the bulk,
and discuss the related mirage effects. Finally, we derive the brane
cosmological evolution within a bulk that contains a global monopole
(hedgehog) configuration. This background induces a mirage curvature
term in the effective Friedmann equation, which can cause a brane
universe with positive spatial curvature to expand forever.
Συγγραφείς:
Apostolopoulos, PS
Brouzakis, N
Saridakis, EN
Tetradis, N
Περιοδικό:
Physical Review D
Εκδότης:
AMER PHYSICAL SOC
DOI:
10.1103/PhysRevD.72.044013
