Stringy Probe Particle and Force Balance

Details Stringy Probe Particle and Force Balance Stringy Probe Particle and Force Balance

1999-07-05

arxiv.org/abs/hep-th/9907017v2

Phys.Rev. D60 (1999) 104046

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, references added, comments added, Phys. Rev. D accepted

Scientific paper

10.1103/PhysRevD.60.104046

We directly derive the classical equation of motion, which governs the centre of mass of a test string, from the string action. In a certain case, the equation is basically same as one derived by Papapetrou, Dixon and Wald for a test extended body. We also discuss the force balance using a stringy probe particle for an exact spinning multi-soliton solution of Einstein-Maxwell-Dilaton-Axion theory. It is well known that the force balance condition yields the saturation of the Bogomol'nyi type bound in the lowest order. In the present formulation the gyromagnetic ratio of the stringy probe particle is automatically determined to be $g=2$ which is the same value as the background soliton. As a result we can confirm the force balance via the gravitational spin-spin interaction.

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