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Article
Report number	hep-th/0203077 ; TUW-02-06 ; ITP-UH-04-02 ; ITP-UH-2002-04 ; TUW-2002-06
Title	Non-commutative tachyon action and D-brane geometry
Author(s)	Herbst, Manfred (CERN) ; Kling, Alexander (Hannover U.) ; Kreuzer, Maximilian (Vienna, Tech. U.)
Publication	2002
Imprint	8 Mar 2002
Number of pages	12
In:	JHEP 08 (2002) 010
DOI	10.1088/1126-6708/2002/08/010
Subject category	Particle Physics - Theory
Abstract	We analyse open string correlators in non-constant background fields, including the metric $g$, the antisymmetric $B$-field, and the gauge field $A$. Working with a derivative expansion for the background fields, but exact in their constant parts, we obtain a tachyonic on-shell condition for the inserted functions and extract the kinetic term for the tachyon action. The 3-point correlator yields a non-commutative tachyon potential. We also find a remarkable feature of the differential structure on the D-brane: Although the boundary metric $G$ plays an essential role in the action, the natural connection on the D-brane is the same as in closed string theory, i.e. it is compatible with the bulk metric and has torsion $H=dB$. This means, in particular, that the parallel transport on the brane is independent of the gauge field $A$.

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