Non-BPS States And Branes In String Theory

We construct the explicit boundary state description of the vortex-type (codimension two) tachyon condensation in brane-antibrane systems generalizing the known result of the kink-type . In this description we show how the RR-charge of the lower dimensional D-branes emerges. We also investigate the tachyon condensation in T 4 /Z 2 orbifold and find that the twisted sector can be treated almost in the same way as the untwisted sector from the viewpoint of the boundary state. Further we discuss the higher codimension cases.

Section: Bosonization Of the Boundary State And Tachyon Condensationmentioning

confidence: 77%

“…Recently there have been tremendous progresses in understanding non-BPS configrations of D-branes and tachyon condensations in them, pioneered by Sen (for a review see [1]). In Superstring theory most of these systems are realized as either brane-antibrane systems [2,3,4,5] or non-BPS D-branes [6,5,7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Boundary state description of tachyon condensation

Naka¹,

Takayanagi²,

Uesugi³

2000

“…For any M > 0 and a = 0 the dihole consists of two oppositely charged, extremal (degenerate horizon) four-dimensional black holes 1 . We write the dihole metric in the inherited BoyerLindquist coordinates as…”

Section: Dihole Spacetimementioning

confidence: 99%

“…Sen's construction [1] of BPS and non-BPS branes as solitons inside higher dimensional branes and the Gutperle/Strominger extension to the timelike case [2] showed the existence of a class of Space-like objects in string theory, as spacelike-extended analogs of ordinary (timelike-extended) branes, references include [3,4,5,6], [7]- [12]. Up to now however Sbranes have been rather mysterious as their role and properties have not been fully understood.…”

Section: Introductionmentioning

confidence: 99%

How to stop (worrying and love) the bubble: boundary changing solutions

Jones

Wang

2007

We discover that a class of bubbles of nothing are embedded as time dependent scaling limits of previous spacelike-brane solutions. With the right initial conditions, a near-bubble solution can relax its expansion and open the compact circle. Thermodynamics of the new class of solutions is discussed and the relationships between brane/flux transitions, tachyon condensation and imaginary D-branes are outlined. Finally, a related class of simultaneous connected S-branes are also examined.

“…where superscripts (11), (12), (21) [19]. Hence, two non-BPS D p -branes of IIA(IIB) may convert to D p -braneanti-D p -brane of IIB(IIA).…”

Section: Review Of Construction Of D Pdp Effective Actionmentioning

confidence: 99%

Tachyon tunnelling in D-brane-anti-D-brane

Bitaghsir

Garousi

2006

Using the tachyon DBI action proposal for the effective theory of noncoincident D p -brane-anti-D p -brane system, we study the decay of this system in the tachyon channel. We assume that the branes separation is held fixed, i.e., no throat formation, and then find the bounce solution which describe the decay of the system from false to the true vacuum of the tachyon potential. We shall show that due to the non-standard form of the kinetic term in the effective action, the thin wall approximation for calculating the bubble nucleation rate gives a result which is independent of the branes separation. This unusual result might indicate that the true decay of this metastable system should be via a solution that represents a throat formation as well as the tachyon tunneling.