Geodesics in generalised Ellis–Bronnikov spacetime embedded in warped 5D background

Vivek Sharma (Department of Physics, Indira Gandhi National Tribal University, Amarkantak, MP, 484887, India) ; Suman Ghosh (Department of Physics, Birla Institute of Technology, Mesra, Ranchi, 835215, India)

We study the particle trajectories in the recently proposed five dimensional warped (generalized) Ellis–Bronnikov spacetime (5D-WGEB) (which does not require exotic matter) as well as it’s four dimensional counterpart (4D-GEB) in detail and conduct a comparative study. Analytical approach provides conditions which determines three types of trajectories (trapped, returning and crossing) for both 4D and 5D spacetimes. Notably in 5D geometry existence of trapped trajectories become highly sensitive to the initial conditions. We have solved the timelike geodesic equations numerically and presented the trajectories graphically along with corresponding geodesic potentials. We thus distinguished the roles of the so-called wormhole parameter and the warping factor regarding their effects on the trajectories and embedding as such. Interestingly, the 5D-WGEB model shows the localization of massive particles around the location of the brane for growing warp factor and runaway trajectories for decaying warp factor.

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Published on:
13 August 2022
Publisher:
Springer
Published in:
European Physical Journal C , Volume 82 (2022)
Issue 8
Pages 1-15
DOI:
https://doi.org/10.1140/epjc/s10052-022-10682-6
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: