On exact tachyon potential in open string field theory

Gerasimov, A.; Shatashvili, Samson L.

doi:10.1088/1126-6708/2000/10/034

Cited by 318 publications

(505 citation statements)

References 6 publications

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“…When p = 2 the theoretical predictions Eqs. (34) and (35) are within the 2σ observational contour bound for N > 50 as found from Fig. 4.…”

Section: Constraints On Braneworld Inflationsupporting

confidence: 83%

See 1 more Smart Citation

Constraints on braneworld inflation from CMB anisotropies

Tsujikawa¹,

Liddle²

2004

J. Cosmol. Astropart. Phys.

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We obtain observational constraints on Randall-Sundrum type II braneworld inflation using a compilation of data including WMAP, the 2dF and latest SDSS galaxy redshift surveys. We place constraints on three classes of inflation models (large-field, small-field and hybrid models) in the high-energy regime, which exhibit different behaviour compared to the low-energy case. The quartic potential is outside the 2σ observational contour bound for a number of e-folds less than 60, and steep inflation driven by an exponential potential is excluded because of its high tensor-to-scalar ratio. It is more difficult to strongly constrain small-field and hybrid models due to additional freedoms associated with the potentials, but we obtain upper bounds for the energy scale of inflation and the model parameters in certain cases. We also discuss possible ways to break the degeneracy of consistency relations and inflationary observables.

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“…When p = 2 the theoretical predictions Eqs. (34) and (35) are within the 2σ observational contour bound for N > 50 as found from Fig. 4.…”

Section: Constraints On Braneworld Inflationsupporting

confidence: 83%

“…(43) by performing a Taylor expansion around φ = 0. The potential of the tachyon field computed in the bosonic string field theory is given by [35,36] …”

Section: B Small-field Modelsmentioning

confidence: 99%

Constraints on braneworld inflation from CMB anisotropies

Tsujikawa¹,

Liddle²

2004

J. Cosmol. Astropart. Phys.

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“…In this completely solvable example we find that the "tachyon matter" state introduced in [1] is just the state of closed strings that the brane decays into. Another interesting issue is the relation between the tachyon potentials discussed in the context of string field theory [46,47,48] to the simple inverted quadratic potential we find here. We think that the relation is the following.…”

Section: Discussionmentioning

confidence: 85%

D-brane decay in two-dimensional string theory

Klebanov

Maldacena

Seiberg

2003

J. High Energy Phys.

221

468

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We consider unstable D0-branes of two dimensional string theory, described by the boundary state of Zamolodchikov and Zamolodchikov [36] multiplied by the Neumann boundary state for the time coordinate t. In the dual description in terms of the c = 1 matrix model, this D0-brane is described by a matrix eigenvalue on top of the upside down harmonic oscillator potential. As suggested by McGreevy and Verlinde [25], an eigenvalue rolling down the potential describes D-brane decay. As the eigenvalue moves down the potential to the asymptotic region it can be described as a free relativistic fermion. Bosonizing this fermion we get a description of the state in terms of a coherent state of the tachyon field in the asymptotic region, up to a non-local linear field redefinition by an energy-dependent phase. This coherent state agrees with the exponential of the closed string one-point function on a disk with Sen's marginal boundary interaction for t which describes D0-brane decay.

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“…From canonical equation of motions, we finḋ 8) while the worldsheet energy-momentum conservation may be written as,…”

Section: Canonical Formulationmentioning

confidence: 99%

Open/closed duality, unstable D-branes and coarse-grained closed strings

Yee¹,

Yi²

2004

Nuclear Physics B

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At the final stage of unstable D-brane decay in the effective field theory approach, all energy and momentum of the initial state are taken up by two types of fluids, known as string fluid and tachyon matter. In this note, we compare motion of this fluid system to that of macroscopic collection of stretched closed strings and find a precise match at classical level. The string fluid reflects low frequency undulation of the stretched strings while the tachyon matter encodes the average effect of high frequency oscillations turned on those strings. In particular, the combined fluid system has been known to have a reduced speed of light, depending on the composition, and we show that this property is exactly reproduced in classical motion on the closed string side. Finally we illustrate how the tachyon matter may be viewed as an effective degrees of freedom carrying high frequency energy-momentum of Nambu-Goto strings by coarse-graining the dynamics of the latter. * ho-ung.yee@kias.re.kr † piljin@kias.re.kr

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On exact tachyon potential in open string field theory

Cited by 318 publications

References 6 publications

Constraints on braneworld inflation from CMB anisotropies

Constraints on braneworld inflation from CMB anisotropies

D-brane decay in two-dimensional string theory

Open/closed duality, unstable D-branes and coarse-grained closed strings

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