Comments on geometric and universal open string tachyons near fivebranes

Dan Israël
2007 Journal of High Energy Physics  
In a recent paper (hep-th/0703157), Sen studied unstable D-branes in NS5-branes backgrounds and argued that in the strong curvature regime the universal open string tachyon (on D-branes of the wrong dimensionality) and the geometric tachyon (on D-branes that are BPS in flat space but not in this background) may become equivalent. We study in this note an example of a non-BPS suspended D-brane vs. a BPS D-brane at equal distance between two fivebranes. We use boundary worldsheet CFT methods to show that these two unstable branes are identical.
doi:10.1088/1126-6708/2007/04/085 fatcat:mqas6xx665hixgvrwk5mgz7duq