Coupling Constant Relations and Effective Lagrangian in the Type I Superstring

Sakai, Norisuke; Abe, Mitsuko

doi:10.1143/ptp.80.162

Cited by 12 publications

(25 citation statements)

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“…The structure of this paper is as follows: in section 2 we will review the one-loop calculation of the gauge action for toroidal compactifications of the SO(32) type-I superstring. In section 3 we will analyze ultraviolet divergences, and rederive in particular the relation between the gauge and gravitational couplings and the string scale, obtained previously by Abe and Sakai [16,17]. The results of these two sections are standard [18,19], but we include them as a warm up for the orbifold calculation which follows in section 4.…”

Section: Introductionmentioning

confidence: 93%

Threshold effects in open-string theory

1996

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Section: Introductionmentioning

confidence: 93%

Threshold effects in open-string theory

1996

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“…The one compact dimension of the D4-brane we live on has volume 2πR 6 . The factor of (2π) 6 π in the above comes from G 10 in type I string theory [17],…”

Section: The String Scalementioning

confidence: 99%

Effect of Cortical Bone Layer on Fast and Slow Waves in Cancellous Bone: Investigations Using Stratified Models

Hosokawa

Nagatani

2012

Jpn. J. Appl. Phys.

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We study inflation and reheating in a brane world model derived from type IIA string theory. This particular set-up is based on a model of string mediated supersymmetry breaking. The inflaton is one of the transverse scalars of a D4-brane which has one of its spatial dimensions stretched between two NS5branes, so that it is effectively three-dimensional. This D4-brane is attracted to a D6-brane that is separated from the 5-branes by a fixed amount. The potential of the transverse scalar due to the D4/D6 interaction makes a good inflaton potential. As the D4-brane slides along the two 5-branes towards the 6-brane it begins to oscillate near the minimum of the potential. The inflaton field couples to the massless standard model fields through Yukawa couplings. In the brane picture these couplings are introduced by having another D6 -brane intersect the D4-brane such that the 4-6 strings, whose lowest lying modes are the standard model matter, couple to the scalar mode of the 4-4 strings, the inflaton. The inflaton can decay into scalar and spinor particles on the 4-6 strings, reheating the universe. Observational data are used to place constraints on the parameters of the model. 3 For references to such models see [2, 3] and references therein. 4 Other inflationary models based on IIA string theory are [4] and [5]. 5 Inflation in Mirage Cosmology was studied in [7,8].

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“…Notice that whichever of the two ⋆ In our notations, λ 2 I corresponds to g 4 open = (2π) 7 g 2 closed of ref. [9]. Also, we normalize the gauge group generators T a to tr(Q a Q b ) = δ ab rather than 2δ ab .…”

Section: Compactifications Of the So(32) Theorymentioning

confidence: 99%

Large-volume string compactifications, revisited

1997

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We reconsider the issue of large-volume compactifications of the heterotic string in light of the recent discoveries about strongly-coupled string theories.Our conclusion remains firmly negative with respect to classical compactifications of the ten-dimensional field theory, albeit for a new reason: When the internal sixfold becomes large in heterotic units, the theory acquires an additional threshold at energies much less then the naive Kaluza-Klein scale. It is this additional threshold that imposes the ultimate limit on the compactification scale M KK > 4 · 10 7 GeV for any compactification; for most compactifications, the actual limit is much higher. (Generically, M KK > α GUT M Planck in either SO(32) or E 8 × E ′ 8 heterotic string.) ⋆

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Coupling Constant Relations and Effective Lagrangian in the Type I Superstring

Cited by 12 publications

References 0 publications

Threshold effects in open-string theory

Threshold effects in open-string theory

Effect of Cortical Bone Layer on Fast and Slow Waves in Cancellous Bone: Investigations Using Stratified Models

Large-volume string compactifications, revisited

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