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Bergman, O.; Thorn, C.B.
Florida Univ., Gainesville, FL (United States). Inst. for Fundamental Theory. Funding organisation: USDOE, Washington, DC (United States)1996
Florida Univ., Gainesville, FL (United States). Inst. for Fundamental Theory. Funding organisation: USDOE, Washington, DC (United States)1996
AbstractAbstract
[en] We construct a 1+1 dimensional superstring-bit model for D=3 Type IIB superstring. This low dimension model escapes the problem encountered in higher dimension models: (1) It possesses full Galilean supersymmetry; (2) For noninteracting Polymers of bits, the exactly soluble linear superpotential describing bit interactions is in a large universality class of superpotentials which includes ones bounded at spatial infinity; (3) The latter are used to construct a superstring-bit model with the clustering properties needed to define an S-matrix for closed polymers of superstring-bits
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1996; 11 p; UFIFT-HEP--95-31; CONTRACT FG05-86ER40272; Also available from OSTI as DE96006416; NTIS; US Govt. Printing Office Dep
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Gaillard, M.K.
Lawrence Berkeley Lab., CA (United States). Funding organisation: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)1995
Lawrence Berkeley Lab., CA (United States). Funding organisation: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)1995
AbstractAbstract
[en] A procedure for Pauli-Villars regularization of locally and globally supersymmetric theories is described. Implications for specific theories, especially those obtained from superstrings, are discussed with emphasis on the role of field theory anomalies
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Jun 1995; 8 p; Super symmetry conference; Palaiseau (France); 15-19 May 1995; CONF-9505289--1; UCB-PTH--95/19; CONTRACT AC03-76SF00098; NSF GRANT PHY-90-21139; Also available from OSTI as DE96000140; NTIS; US Govt. Printing Office Dep
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[en] We study nonperturbative superpotentials with positive exponents, i.e. the form like AeaT with positive constant a and the modulus T.
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SUSY08: 16. international conference on supersymmetry and the unification of fundamental interactions; Seoul (Korea, Republic of); 16-21 Jun 2008; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
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Kokorelis, C.
Sussex Univ., Brighton (United Kingdom)1997
Sussex Univ., Brighton (United Kingdom)1997
AbstractAbstract
No abstract available
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Dec 1997; [vp.]; Available from British Library Document Supply Centre- DSC:DXN016493; Thesis (Ph.D.)
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Miscellaneous
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Thesis/Dissertation
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Chapline, G.
Lawrence Livermore National Lab., CA (United States). Funding organisation: USDOE Assistant Secretary for Defense Programs, Washington, DC (United States)1996
Lawrence Livermore National Lab., CA (United States). Funding organisation: USDOE Assistant Secretary for Defense Programs, Washington, DC (United States)1996
AbstractAbstract
[en] The pattern of duality symmetries acting on the states of compactified superstring models reinforces an earlier suggestion that the Monster sporadic group is a hidden symmetry for superstring models. This in turn points to a supersymmetric theory of self-dual and anti-self-dual K3 manifolds joined by Dirac strings and evolving in a 13 dimensional spacetime as the fundamental theory. In addition to the usual graviton and dilaton this theory contains matter-like degrees of freedom resembling the massless states of the heterotic string, thus providing a completely geometric interpretation for ordinary matter. 25 refs
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Sep 1996; 17 p; String '96: annual meeting on strings; Santa Barbara, CA (United States); 15-20 Jul 1996; CONF-9607119--2; CONTRACT W-7405-ENG-48; Available from OSTI as DE97051524; NTIS; US Govt. Printing Office Dep
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[en] A couple of issues concerning the effective dynamics of D-branes in string theory are discussed. Primarily, I am concerned with linearization of the actions by introduction of non-propagating fields and a full super- and κ-symmetric description of D-branes. (orig.)
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30. international symposium Ahrenshoop on the theory of elementary particles; Buckow (Germany); 27-31 Aug 1996
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Schlotterer, O; Stieberger, S, E-mail: stephan.stieberger@mpp.mpg.de2013
AbstractAbstract
[en] The structure of tree-level open and closed superstring amplitudes is analyzed. For the open superstring amplitude we find a striking and elegant form, which allows one to disentangle its α′-expansion into several contributions accounting for different classes of multiple zeta values. This form is bolstered by the decomposition of motivic multiple zeta values, i.e. the latter encapsulate the α′-expansion of the superstring amplitude. Moreover, a morphism induced by the coproduct maps the α′-expansion onto a non-commutative Hopf algebra. This map represents a generalization of the symbol of a transcendental function. In terms of elements of this Hopf algebra the α′-expansion assumes a very simple and symmetric form, which carries all the relevant information. Equipped with these results we can also cast the closed superstring amplitude into a very elegant form. (paper)
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Available from http://dx.doi.org/10.1088/1751-8113/46/47/475401; Country of input: International Atomic Energy Agency (IAEA)
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Journal of Physics. A, Mathematical and Theoretical (Online); ISSN 1751-8121;
; v. 46(47); [37 p.]

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Buchbinder, Evgeny I.; Constantin, Andrei; Lukas, Andre
Funding organisation: SCOAP3, CERN, Geneva (Switzerland)
arXiv e-print [ PDF ]2014
Funding organisation: SCOAP3, CERN, Geneva (Switzerland)
arXiv e-print [ PDF ]2014
AbstractAbstract
[en] It has recently been realised that polystable, holomorphic sums of line bundles over smooth Calabi-Yau three-folds provide a fertile ground for heterotic model building. Large numbers of phenomenologically promising such models have been constructed for various classes of Calabi-Yau manifolds. In this paper we focus on a case study for the tetra-quadric — a Calabi-Yau hypersurface embedded in a product of four ℂℙ"1 spaces. We address the question of finiteness of the class of consistent and physically viable line bundle models constructed on this manifold. Further, for a specific semi-realistic example, we explore the embedding of the line bundle sum into the larger moduli space of non-Abelian bundles, both by means of constructing specific polystable non-Abelian bundles and by turning on VEVs in the associated low-energy theory. In this context, we explore the fate of the Higgs doublets as we move in bundle moduli space. The non-Abelian compactifications thus constructed lead to SU(5) GUT models with an additional global B−L symmetry. The non-Abelian compactifications inherit many of the appealing phenomenological features of the Abelian model, such as the absence of dimension four and dimension five operators triggering fast proton decay
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Available from http://dx.doi.org/10.1007/JHEP03(2014)025; Available from http://repo.scoap3.org/record/1537; PUBLISHER-ID: JHEP03(2014)025; OAI: oai:repo.scoap3.org:1537; Copyright (c) OPEN ACCESS, © The Authors; This article is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Journal of High Energy Physics (Online); ISSN 1029-8479;
; v. 2014(03); p. 25

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AbstractAbstract
[en] The Grand Unification Theory with the (SU5 circle-times U1)circle-times(SU3 circle-times U1)H gauge group, in which (SU3 circle-times U1)H is the horizontal symmetry of quark-lepton generations, is considered within the framework of the approach using a four-dimensional superstring with free fermions. The horizontal hypercharge YH is used to quantize electromagnetic charges of quarks and leptons within the framework of standard SO10 16-plets. In the authors approach, construction of the horizontal gauge symmetry leads to the appearance of a new massive SO10 16-plet, which is a singlet with respect to the horizontal group. The resulting Higgs sector may enable the hidden gauge group to be suppressed significantly and to break the flip SU5 circle-times U1 symmetry first to SM and then to SUc3 circle-times Uem1. The Qem construction allows the authors to avoid states with exotic charges (Qexem = 1/nQem), whose emergence is characteristic of the approach using four-dimensional superstrings. In the authors approach, the horizontal group can be violated in the low-energy limit, which offers a possibility for the existence of a superweaklike mechanism of CP violation in the gauge sector of the SU3H group. 19 refs., 2 tabs
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Translated from Yadernaya Fizika; 57: No. 1, 168-174(1994).
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[en] We investigate the NBI matrix model with the potential $X/Λ+X-1+(2/η+1)/log X$ recently proposed to describe IIB superstrings. With the proper normalization, using Virasoro constraints, we prove the equivalence of this model and the Kontsevich matrix model for $/η/ne0$ and find the explicit transformation between the two models. (author)
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Available in electronic form only at the Web site of the Journal of High Energy Physics located at http://jhep.sissa.it/. E-print number: hep-th/9805212
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Journal Article
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Journal of High Energy Physics (Online); ISSN 1029-8479;
; v. 12(1998); p. vp

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