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A Toy Model of Closed String Tachyon Effective Action
, 2004
"... Abstract: In this paper we propose the toy model of the closed string tachyon effective action that has marginal tachyon profile as its exact solution in case of constant or linear dilaton background. Then we will apply this model for description of two dimensional bosonic string theory. We will fin ..."
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Abstract: In this paper we propose the toy model of the closed string tachyon effective action that has marginal tachyon profile as its exact solution in case of constant or linear dilaton background. Then we will apply this model for description of two dimensional bosonic string theory. We will find that the background configuration with the spatial dependent linear dilaton, flat spacetime metric and marginal tachyon profile is the exact solution of our model even if we take into account backreaction of tachyon on dilaton and on metric.
Note About Unstable M3brane Action
, 810
"... Abstract: We construct an action for unstable M3brane in Mtheory. We argue that in order to find M3brane action that upon direct dimensional reduction leads to nonBPS D3brane action in type IIA theory we have to presume that the background possesses Killing isometry and that this isometry has t ..."
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Abstract: We construct an action for unstable M3brane in Mtheory. We argue that in order to find M3brane action that upon direct dimensional reduction leads to nonBPS D3brane action in type IIA theory we have to presume that the background possesses Killing isometry and that this isometry has to be gauged on the worldvolume of M3brane. Then we construct singular tachyon kink on worldvolume of M3brane and we show that the dynamics of resulting topological defect is governed by an action that upon direct dimensional reduction leads to D2brane in type IIA theory and that is equivalent to standard M2brane action in flat background.
Comments on Higher Derivative Terms for the Tachyon Action
, 2004
"... We consider the open string tachyon action in a world–sheet sigma model approach. We present explicit calculations up to order 8 in derivatives for the bosonic string, and mimic these to order 6 for the superstring, including terms with multiple derivatives acting on the tachyon field. We reproduce ..."
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We consider the open string tachyon action in a world–sheet sigma model approach. We present explicit calculations up to order 8 in derivatives for the bosonic string, and mimic these to order 6 for the superstring, including terms with multiple derivatives acting on the tachyon field. We reproduce lower derivative terms obtained elsewhere, and speculate on the role of the world–sheet contact terms in regularizing the action for the superstring tachyon. 1