Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-06-20
Class.Quant.Grav.26:055004,2009
Physics
High Energy Physics
High Energy Physics - Theory
26 pages, v2: added references, v3: one ref. updated, to appear in Class. and Quant. Gravity
Scientific paper
10.1088/0264-9381/26/5/055004
We present a detailed analysis of our recent observation that the origin of the geometric tachyon, which arises when a D$p$-brane propagates in the vicinity of a stack of coincident NS5-branes, is due to the proper acceleration generated by the background dilaton field. We show that when a fundamental string (F-string), described by the Nambu-Goto action, is moving in the background of a stack of coincident D$p$-branes, the geometric tachyon mode can also appear since the overall conformal mode of the induced metric for the string can act as a source for proper acceleration. We also studied the detailed dynamics of the F-string as well as the instability by mapping the Nambu-Goto action of the F-string to the tachyon effective action of the non-BPS D-string. We qualitatively argue that the condensation of the geometric tachyon is responsible for the (F,D$p$) bound state formation.
Das Ashok
Panda Sudhakar
Roy Shibaji
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