Particle motion in weak relativistic gravitational fields

Obradovic, Miki, Kunz, Martin, Hindmarsh, Mark and Iliev, Ilian T (2012) Particle motion in weak relativistic gravitational fields. Physical Review D, 86 (6). 064018-064029. ISSN 1550-7998

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We derive the geodesic equation of motion in the presence of weak gravitational fields produced by relativistic sources such as cosmic strings, decomposed into scalar, vector and tensor parts. To test the result, we perform the first N-body simulations with relativistic weak gravitational external fields. Our test case is a moving straight string, for which we recover the well-known result for the impulse on nonrelativistic particles. We find that the vector (gravito-magnetic) force is an essential contributor. Our results mean that it is now possible to incorporate straightforwardly into N-body simulations all weak relativistic sources, including networks of cosmic defects.

Item Type: Article
Keywords: Post-Newtonian approximation; perturbation theory; related approximations, Mathematical procedures and computer techniques, Particle-theory and field-theory models of the early Universe
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
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Depositing User: Ilian Iliev
Date Deposited: 18 Oct 2012 08:45
Last Modified: 07 Mar 2017 05:56

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