Origin of the geometric tachyon

Details Origin of the geometric tachyon Origin of the geometric tachyon

2008-04-17

arxiv.org/abs/0804.2863v2

Phys.Rev.D78:061901,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, revtex, v2: eq.(22), (24) and (25) corrected

Scientific paper

10.1103/PhysRevD.78.061901

The motion of a Dp-brane in the background of a stack of coincident NS5-branes is analysed as the motion of a relativistic point particle in the transverse space of the five-branes. In this system, the particle experiences a proper acceleration orthogonal to its proper velocity due to the background dilaton field which changes the dynamics from that of a simple geodesic motion. In particular, we show that in the vicinity of the five-branes, it is this acceleration which is responsible for modifying the motion of the radial mode to that of an inverted simple harmonic oscillator leading to the tachyonic instability.

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