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...tachyon is neutral, the gauge field cannot acquire mass via the Higgs mechanism. Also, how do open strings with one endpoint lying on the D-brane in question disappear after tachyon condensation? Ref.=-=[26]-=- proposed that at the extrema T = Tc, the action of the gauge field vanishes identically. This explains the absence of a dynamical gauge field. In addition, the path integral over the gauge field now ...

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...→ ∞. From the worldsheet analysis it is expected that they all “disappear” from the spectrum, but the precise mechanism by which this happens in spacetime is not well understood. It has been proposed =-=[14]-=- that the coefficients of the kinetic terms vanish at the “stable minimum” but the situation is unclear. The viewpoint of this paper sheds some light on these issues. We would like to construct the ac...

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... discussion with open strings living on a D-brane in bosonic string theory; and later generalise it to 5 The argument given in this section is an expanded version of the analysis already presented in =-=[15]-=-. 5brane-antibrane system or non-BPS D-branes in superstring theories. As mentioned in the introduction, we compactify all the spatial directions tangential to the D-brane. Thus we are dealing with t...

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...moved together with the D-brane. If so, through what kind of mechanism does the U(1) gauge field disappear? This is so-called ‘U(1) problem’ and discussed under the name of ‘Fate of U(1) gauge field’ =-=[5, 26, 33, 13, 27, 28, 85, 31]-=-. Before meddling in this problem, let us investigate the properties of the ‘closed string vacuum’ more closely. 2.9.1 Effective tachyon potential First, we examine the structure of the effective tach...

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...ng field theory action than in the bosonic case. In [15] by using this conjecture the effective action of non-BPS brane was calculated and this result was equal to the proposed form in several papers =-=[20, 21, 22, 23]-=- if we assume that the tachyon field is constant. On the other hand only limited results for the effective action of the brane-antibrane have been obtained. For the results from on-shell scattering am...

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... ρ, σ are given by (2.6)-(2.7). It follows from (2.6)-(2.7) that as t → ∞, Tij → 0, i.e. the system becomes pressureless. 5. The formula for ρ(t) can be obtained1 from an effective field theory model =-=[26,27]-=- for ∫ √ the tachyon with the action S = −Tp V (T) −det(ηµν + ∂µT∂νT) with the potential V (T) = 1 cosh T 2 , (2.9) as we detail in appendix B, see also [22,23,28,29]. 2.2. Closed string radiation A D...

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...efficient of the kinetic term, which we call f(φ)/2, becomes f(φc) = 1 − 8κ ln(6κ)φc ≈ −.05. (3.2) The approximate vanishing of the kinetic term at the minimum seems consistent with the conjecture of =-=[10]-=- that tachyon condensation sets all kinetic terms to zero and is related to the observation in [2] that there are no physical poles for the tachyon and transverse component of the U(1) gauge field in ...

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...ions [8] all suggest that D-branes can be constructed as solitons or lumps in open string field theory. Analogies between tachyon condensation in open string theory and confinement of electric charge =-=[9]-=- have also motivated suggestions that macroscopic closed strings can be described by flux tubes in open string field theory [4,10,11]. It is known that fundamental strings ending on D-branes can be vi...

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...ent in this open string field theory. Progress in identifying the fundamental string has been made in refs.[13, 14, 8, 15, 16]. In particular, in [14, 8, 15, 16] it was shown that the effective action=-=[17]-=- describing the dynamics of the D-brane around the tachyonic vacuum admits string-like classical solution whose tension matches that of a fundamental string. It was also established that on a D-25-bra...