Research articles, presentations, and other scholarship

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  • Geometric constraints in dual F-theory and heterotic string compactifications 

    Anderson, Lara B.; Taylor, Washington (Springer, 2014-08-05)
    We systematically analyze a broad class of dual heterotic and F-theory models that give four-dimensional supergravity theories, and compare the geometric constraints on the two sides of the duality. Specifically, we give ...
  • T-branes and geometry 

    Anderson, Lara B.; Heckman, Jonathan J.; Katz, Sheldon (Springer, 2014-05-19)
    T-branes are a non-abelian generalization of intersecting branes in which the matrix of normal deformations is nilpotent along some subspace. In this paper we study the geometric remnant of this open string data for ...
  • Notes on nonabelian (0,2) theories and dualities 

    Jia, Bei; Sharpe, Eric; Wu, Ruoxu (Springer, 2014-08-05)
    In this paper we explore basic aspects of nonabelian (0,2) GLSMs in two dimensions for unitary gauge groups, an arena that until recently has largely been unexplored. We begin by discussing general aspects of (0,2) theories, ...
  • Algebroids, heterotic moduli spaces and the Strominger system 

    Anderson, Lara B.; Gray, James; Sharpe, Eric (Springer, 2014-07-08)
    In this paper we study compactifications of heterotic string theory on manifolds satisfying the partial derivative(partial derivative) over bar -lemma. We consider the Strominger system description of the low energy ...
  • Topological invariants and fibration structure of complete intersection Calabi-Yau four-folds 

    Gray, James; Haupt, Alexander S.; Lukas, Andre (Springer, 2014-09-17)
    We investigate the mathematical properties of the class of Calabi-Yau four-folds recently found in ref. [1]. This class consists of 921,497 configuration matrices which correspond to manifolds that are described as complete ...
  • Physics of F-theory compactifications without section 

    Anderson, Lara B.; Garcia-Etxebarria, Inaki; Grimm, Thomas W.; Keitel, Jan (Springer, 2014-12-24)
    We study the physics of F-theory compactifications on genus-one fibrations without section by using an M-theory dual description. The five-dimensional action obtained by considering M-theory on a Calabi-Yau threefold is ...
  • Metastring theory and modular space-time 

    Freidel, Laurent; Leigh, Robert G.; Mini, Djordje (Springer, 2015-06-03)
    String theory is canonically accompanied with a space-time interpretation which determines S-matrix-like observables, and connects to the standard physics at low energies in the guise of local effective field theory. ...
  • Dimensional oxidation and modular completion of non-geometric type IIB action 

    Gao, Xin; Shukla, Pramod (Springer, 2015-05-05)
    Utilizing a setup of type IIB superstring theory compactified on an orientifold of T-6/(Z(2) x Z(2)), we propose a modular invariant dimensional oxidation of the four-dimensional scalar potential. In the oxidized ten-dimensional ...
  • Wilson lines and Chern-Simons flux in explicit heterotic Calabi-Yau compactifications 

    Apruzzi, Fabio; Gautason, Fridrik Freyr; Parameswaran, Susha; Zagermann, Marco (Springer, 2015-02-27)
    We study to what extent Wilson lines in heterotic Calabi-Yau compactifications lead to non-trivial H-flux via Chern-Simons terms. Wilson lines are basic ingredients for Standard Model constructions but their induced H-flux ...
  • A Calabi-Yau database: threefolds constructed from the Kreuzer-Skarke list 

    Altman, Ross; Gray, James; He, Yang-Hui; Jejjala, Vishnu; Nelson, Brent D. (Springer, 2015-02-25)
    Kreuzer and Skarke famously produced the largest known database of Calabi-Yau threefolds by providing a complete construction of all 473,800,776 reflexive polyhedra that exist in four dimensions [1]. These polyhedra describe ...
  • Chiral operators in two-dimensional (0,2) theories and a test of triality 

    Guo, Jirui; Jia, Bei; Sharpe, Eric (Springer, 2015-06-30)
    In this paper we compute spaces of chiral operators in general two-dimensional (0,2) nonlinear sigma models, both in theories twistable to the A/2 or B/2 model, as well as in non-twistable theories, and apply them to check ...
  • Localization of twisted N=(0,2) gauged linear sigma models in two dimensions 

    Closset, Cyril; Gu, Wei; Jia, Bei; Sharpe, Eric (Springer, 2016-03-14)
    We study two-dimensional N=(0, 2) supersymmetric gauged linear sigma models (GLSMs) using supersymmetric localization. We consider N=(0, 2) theories with an R-symmetry, which can always be defined on curved space by a ...
  • Mutation, Witten index, and quiver invariant 

    Kim, Heeyeon; Lee, Seung-Joo; Yi, Piljin (Springer, 2015-07-20)
    We explore Seiberg-like dualities, or mutations, for quiver quantum mechanics in the context of wall-crossing. In contrast to higher dimensions, the 1d Seiberg-duality must be performed with much care. With fixed ...
  • Matter in transition 

    Anderson, Lara B.; Gray, James; Raghuram, Nikhil; Taylor, Washington (Springer, 2016-04-13)
    We explore a novel type of transition in certain 6D and 4D quantum field theories, in which the matter content of the theory changes while the gauge group and other parts of the spectrum remain invariant. Such transitions ...
  • Witten index for noncompact dynamics 

    Lee, Seung-Joo; Yi, Piljin (Springer, 2016-06-16)
    Among gauged dynamics motivated by string theory, we find many with gapless asymptotic directions. Although the natural boundary condition for ground states is L-2, one often turns on chemical potentials or supersymmetric ...
  • Toda-like (0,2) mirrors to products of projective spaces 

    Chen, Zhuo; Sharpe, Eric; Wu, Ruoxu (Springer, 2016-08-16)
    One of the open problems in understanding (0,2) mirror symmetry concerns the construction of Toda-like Landau-Ginzburg mirrors to (0,2) theories on Fano spaces. In this paper, we begin to fill this gap by making an ansatz ...
  • Tools for CICYs in F-theory 

    Anderson, Lara B.; Gao, Xin; Gray, James; Lee, Seung-Joo (Springer, 2016-11-02)
    We provide a set of tools for analyzing the geometry of elliptically fibered Calabi-Yau manifolds, starting with a description of the total space rather than with a Weierstrass model or a specified type of fi ber/base. ...
  • Multiple fibrations in Calabi-Yau geometry and string dualities 

    Anderson, Lara B.; Gao, Xin; Gray, James; Lee, Seung-Joo (Springer, 2016-10-19)
    In this work we explore the physics associated to Calabi-Yau (CY) n-folds that can be described as a fibration in more than one way. Beginning with F-theory vacua in various dimensions, we consider limits/dualities with ...
  • D-particles on orientifolds and rational invariants 

    Lee, Seung-Joo; Yi, Piljin (Springer, 2017-07-11)
    We revisit the DO bound state problems, of the M/IIA duality, with the Orientifolds. The cases of 04 and 08 have been studied recently, from the perspective of five-dimensional theories, while the case of O0 has been much ...
  • Mordell-Weil torsion in the mirror of multi-sections 

    Oehlmann, Paul-Konstantin; Reuter, Jonas; Schimannek, Thorsten (Springer, 2016-12-12)
    We give further evidence that genus-one fibers with multi-sections are mirror dual to fibers with Mordell-Weil torsion. In the physics of F-theory compactifications this implies a relation between models with a non-simply ...

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