M. Ronen Plesser

Journal Article Journal of High Energy Physics · September 1, 2022 We discuss renormalization group flows in two-dimensional quantum field theories with (0,2) supersymmetry. We focus on theories with UV described by a Landau-Ginzburg Lagrangian and use the chiral algebra to constrain the IR dynamics. We present examples w ... Full text Cite

(0,2) hybrid models

Journal Article Journal of High Energy Physics · September 1, 2018 We introduce a class of (0,2) superconformal field theories based on hybrid geometries, generalizing various known constructions. We develop techniques for the computation of the complete massless spectrum when the theory can be interpreted as determining ... Full text Open Access Cite

SU(N) Transitions in M-Theory on Calabi–Yau Fourfolds and Background Fluxes

Journal Article Communications in Mathematical Physics · April 1, 2017 We study M-theory on a Calabi–Yau fourfold with a smooth surface S of AN–1 singularities. The resulting three-dimensional theory has a N= 2 SU(N) gauge theory sector, which we obtain from a twisted dimensional reduction of a seven-dimensional N= 1 SU(N) ga ... Full text Cite

Mirror Symmetry and Discriminants

Journal Article · February 15, 2017 We analyze the locus, together with multiplicities, of "bad" conformal field theories in the compactified moduli space of N=(2,2) superconformal field theories in the context of the generalization of the Batyrev mirror construction using the gauged linear ... Open Access Link to item Cite

General mirror pairs for gauged linear sigma models

Journal Article Journal of High Energy Physics · November 1, 2015 Abstract: We carefully analyze the conditions for an abelian gauged linear σ-model to exhibit nontrivial IR behavior described by a nonsingular superconformal field theory determining a superstring vacuum. This is done without reference to a geometric phas ... Full text Cite

Special Lagrangian torus fibrations of complete intersection Calabi-Yau manifolds: A geometric conjecture

Journal Article Nuclear Physics B · September 1, 2015 For complete intersection Calabi-Yau manifolds in toric varieties, Gross and Haase-Zharkov have given a conjectural combinatorial description of the special Lagrangian torus fibrations whose existence was predicted by Strominger, Yau and Zaslow. We present ... Full text Cite

Worldsheet instantons and (0,2) linear models

Journal Article Journal of High Energy Physics · August 28, 2015 Abstract: We study the stability of heterotic compactifications described by (0,2) gauged linear sigma models with respect to worldsheet instanton corrections to the space-time superpotential following the work of Beasley and Witten [1]. We show that gener ... Full text Cite

Massless spectrum for hybrid CFTs

Journal Article · December 5, 2014 Full text Open Access Cite

Accidents in (0,2) Landau-Ginzburg theories

Journal Article Journal of High Energy Physics · January 1, 2014 Abstract: We study the role of accidental symmetries in two-dimensional (0,2) superconformal field theories obtained by RG flow from (0,2) Landau-Ginzburg theories. These accidental symmetries are ubiquitous, and, unlike in the case of (2,2) theories, thei ... Full text Cite

Hybrid conformal field theories

Journal Article Journal of High Energy Physics · January 1, 2014 We describe a class of (2,2) superconformal field theories obtained by fibering a Landau-Ginzburg orbifold CFT over a compact Kähler base manifold. While such models are naturally obtained as phases in a gauged linear sigma model, our construction is indep ... Full text Cite

Conifold transitions in m-theory on calabi-yau fourfolds with background fluxes

Journal Article Advances in Theoretical and Mathematical Physics · December 1, 2013 We consider topology changing transitions for M-theory compactifications on Calabi-Yau fourfolds with background G-flux. The local geometry of the transition is generically a genus g curve of conifold singularities, which engineers a 3d gauge theory with f ... Full text Cite

(0,2) elephants

Journal Article Journal of High Energy Physics · February 27, 2012 We enumerate massless E6 singlets for (0,2)-compactifications of the heterotic string on a Calabi-Yau threefold with the \standard embedding" in three distinct ways. In the large radius limit of the threefold, these singlets count deformations of the Calab ... Full text Cite

Elusive Worldsheet Instantons in Heterotic String Compactifications

Journal Article STRING-MATH 2011 · January 1, 2012 Open Access Link to item Cite

A (0,2) mirror map

Journal Article Journal of High Energy Physics · September 28, 2011 We study the linear sigma model subspace of the moduli space of (0,2) superconformal world-sheet theories obtained by deforming (2,2) theories based on Calabi-Yau hypersurfaces in reflexively plain toric varieties. We describe a set of algebraic coordinate ... Full text Cite

(0,2) Deformations of linear sigma models

Journal Article Journal of High Energy Physics · January 1, 2011 We study (0,2) deformations of a (2,2) supersymmetric gauged linear sigma model for a Calabi-Yau hypersurface in a Fano toric variety. In the non-linear sigma model these correspond to some of the holomorphic deformations of the tangent bundle on the hyper ... Full text Cite

Decompactifications and massless D-branes in hybrid models

Journal Article Journal of High Energy Physics · January 1, 2010 A method of determining the mass spectrum of BPS D-branes in any phase limit of a gauged linear sigma model is introduced. A ring associated to monodromy is defined and one considers K-theory to be a module over this ring. A simple but interesting class of ... Full text Cite

A-Model correlators from the Coulomb branch

Journal Article Journal of High Energy Physics · February 1, 2006 We compute the contribution of discrete Coulomb vacua to A-Model correlators in toric Gauged Linear Sigma Models. For models corresponding to a compact variety, this determines the correlators at arbitrary genus. For non-compact examples, our results imply ... Full text Cite

The Coulomb branch in gauged linear sigma models

Journal Article Journal of High Energy Physics · June 1, 2005 We investigate toric GLSMs as models for tachyon condensation in type II strings on space-time non-supersymmetric orbifold singularities. The A-model correlators in these theories satisfy a set of relations related to the topology of the resolved orbifold. ... Full text Cite

SUPERSYMMETRIC BOUNDARY CONDITIONS FOR THE ${\mathcal N} = 2$ SIGMA MODEL

Journal Article Quantum Theory and Symmetries · October 2004 Full text Cite

Localized tachyons in ℂ³/ℤN

Journal Article Journal of High Energy Physics · August 1, 2004 We study the condensation of localized closed string tachyons in ℂ3/ℤN non-supersymmetric noncompact orbifold singularities via renormalization group flows that preserve supersymmetry in the worldsheet conformal field theory and their interrelations with t ... Cite

Localized tachyons in ℂ³/ℤN

Localized tachyons in ℂ³/ℤ_N

Journal Article Journal of High Energy Physics · 2004 We study the condensation of localized closed string tachyons in ℂ3/ℤN non-supersymmetric noncompact orbifold singularities via renormalization group flows that preserve supersymmetry in the worldsheet conformal field theory and their interrelations with t ... Cite

Localized tachyons in ℂ³/ℤ_N

Coarse-graining quivers

Journal Article · September 16, 2003 We describe a block-spin-like transformation on a simplified subset of the space of supersymmetric quiver gauge theories that arise on the worldvolumes of D-brane probes of orbifold geometries, by sequentially Higgsing the gauge symmetry in these theories. ... Open Access Link to item Cite

D-branes, discrete torsion and the McKay correspondence

Journal Article Journal of High Energy Physics · January 1, 2001 We analyze the D-branes of a type-IIB string theory on an orbifold singularity including the possibility of discrete torsion following the work of Douglas et al. First we prove some general results about the moduli space of a point associated to the "regul ... Full text Cite

D-branes, discrete torsion and the McKay correspondence

Journal Article Journal of High Energy Physics · 2001 We analyze the D-branes of a type-IIB string theory on an orbifold singularity including the possibility of discrete torsion following the work of Douglas et al. First we prove some general results about the moduli space of a point associated to the "regul ... Cite

Toric duality is seiberg duality

Journal Article Journal of High Energy Physics · January 1, 2001 We study four N = 1 SU(N)6 gauge theories, with bi-fundamental chiral matter and a superpotential. In the infrared, these gauge theories all realize the low-energy world-volume description of N coincident D3-branes transverse to the complex cone over a del ... Full text Cite

D3-branes on partial resolutions of abelian quotient singularities of Calabi-Yau threefolds

Journal Article Nuclear Physics B · February 7, 2000 We investigate field theories on the world-volume of a D3-brane transverse to partial resolutions of a ℤ3 × ℤ3 Calabi-Yau threefold quotient singularity. We deduce the field content and Lagrangian of such theories and present a systematic method for mappin ... Full text Cite

Heterotic string corrections from the dual type-II string

Journal Article Journal of High Energy Physics · January 1, 2000 We introduce a method of using the a dual type-IIA string to compute α′-corrections to the moduli space of heterotic string compactifications. In particular we study the hypermultiplet moduli space of a heterotic string on a K3 surface. One application of ... Full text Cite

Heterotic string corrections from the dual type-II string

Journal Article Journal of High Energy Physics · 2000 We introduce a method of using the a dual type-IIA string to compute α′-corrections to the moduli space of heterotic string compactifications. In particular we study the hypermultiplet moduli space of a heterotic string on a K3 surface. One application of ... Cite

T-duality can fail

Journal Article Journal of High Energy Physics · January 1, 1999 We show that T-duality can be broken by non-perturbative effects in string coupling. The T-duality in question is that of the 2-torus when the heterotic string is compactified on K3xT2. This case is compared carefully to a situation where T-duality appears ... Full text Cite

Non-spherical horizons, I

Journal Article Advances in Theoretical and Mathematical Physics · January 1, 1999 We formulate an extension of Maldacena's AdS/CFT conjectures to the case of branes located at singular points in the ambient transverse space. For singularities which occur at finite distance in the moduli space of M or F theory models with spacetimefillin ... Full text Cite

T-duality can fail

Journal Article Journal of High Energy Physics · 1999 We show that T-duality can be broken by non-perturbative effects in string coupling. The T-duality in question is that of the 2-torus when the heterotic string is compactified on K3xT2. This case is compared carefully to a situation where T-duality appears ... Cite

N = 2 moduli spaces and N = 1 dualities for SO(nc) and USp(2nc) super-QCD

Journal Article Nuclear Physics B · January 6, 1997 We determine the exact global structure of the moduli space of N = 2 supersymmetric SO(n) and USp(2n) gauge theories with matter hypermultiplets in the fundamental representations, using the non-renormalization theorem for the Higgs branches and the exact ... Full text Cite

N = 2 moduli spaces and N = 1 dualities for SO(n_c) and USp(2n_c) super-QCD

Journal Article Nuclear Physics B · 1997 We determine the exact global structure of the moduli space of N = 2 supersymmetric SO(n) and USp(2n) gauge theories with matter hypermultiplets in the fundamental representations, using the non-renormalization theorem for the Higgs branches and the exact ... Cite

Enhanced gauge symmetry in type II string theory

Journal Article Nuclear Physics B · October 7, 1996 We show how enhanced gauge symmetry in type II string theory compactified on a Calabi-Yau threefold arises from singularities in the geometry of the target space. When the target space of the type IIA string acquires a genus g curve C of AN-1 singularities ... Full text Cite

The moduli space of vacua of N = 2 SUSY QCD and duality in N = 1 SUSY QCD

Journal Article Nuclear Physics B · July 8, 1996 We analyze in detail the moduli space of vacua of N = 2 SUSY QCD with nc colors and nf flavors. The Coulomb branch has submanifolds with non-Abelian gauge symmetry. The massless quarks and gluons at these vacua are smoothly connected to the underlying elem ... Full text Cite

New N = 2 superconformal field theories in four dimensions

Journal Article Nuclear Physics B · February 19, 1996 New examples of N = 2 supersymmetric conformal field theories are found as fixed points of SU(2) N = 2 supersymmetric QCD. Relations among the scaling dimensions of their relevant chiral operators, global symmetries, and Higgs branches are understood in te ... Full text Cite

Towards mirror symmetry as duality for two dimensional Abelian gauge theories

Journal Article Nuclear Physics B - Proceedings Supplements · January 1, 1996 Superconformal sigma models with Calabi-Yau target spaces described as complete intersection subvarieties in toric varieties can be obtained as the low-energy limit of certain abelian gauge theories in two dimensions. We formulate mirror symmetry for this ... Full text Cite

Mirror manifolds in higher dimension

Journal Article Communications in Mathematical Physics · November 1, 1995 We describe mirror manifolds in dimensions different from the familiar case of complex threefolds. We isolate certain simplifying features present only in dimension three, and supply alternative methods that do not rely on these special characteristics and ... Full text Cite

Coulomb Phase of N=2 Supersymmetric QCD.

Journal Article Physical review letters · August 1995 Full text Cite

Summing the instantons: Quantum cohomology and mirror symmetry in toric varieties

Journal Article Nuclear Physics, Section B · April 24, 1995 We use the gauged linear sigma model introduced by Witten to calculate instanton expansions for correlation functions in topological sigma models with target space a toric variety V or a Calabi-Yau hypersurface M ⊂ V. In the linear model the instanton modu ... Full text Cite

Topological Landau-Ginzburg formulation and integrable structure of two-dimensional string theory

Journal Article Nuclear Physics, Section B · August 22, 1994 We construct a topological Landau-Ginzburg formulation of the two-dimensional string at the self-dual radius. The model is an analytic continuation of the Ak+1 minimal model to k = -3. We compute the superpotential and calculate tachyon correlators in the ... Full text Cite

The partition function of two-dimensional string theory

Journal Article Nuclear Physics, Section B · April 12, 1993 We derive a compact and explicit expression for the generating functional of all correlation functions of tachyon operators in two-dimensional string theory. This expression makes manifest relations of the c = 1 system to KP flow nd W1 + ∞ constraints. Mor ... Full text Cite

The partition function of 2d string theory

Journal Article Nuclear Physics B · 1993 Link to item Cite

Exact S-matrix for two-dimensional string theory

Journal Article Nuclear Physics, Section B · June 22, 1992 We formulate simple graphical rules which allow explicit calculation of nonperturbative c = 1 S-matrices. This allows us to investigate the constraint of nonperturbative unitarity, which indeed rules out some theories. Nevertheless, we show that there is a ... Full text Cite

Classical scattering in (1 + 1)-dimensional string theory

Journal Article Physical Review D · January 1, 1992 We find the general solution to Polchinski's classical scattering equations for (1 + 1)-dimensional string theory. This allows efficient computation of scattering amplitudes in the standard Liouville×c=1 background. Moreover, the solution leads to a mappin ... Full text Cite

MIRROR MANIFOLDS - A BRIEF REVIEW AND PROGRESS REPORT

Journal Article PARTICLES, STRINGS AND COSMOLOGY · January 1, 1992 Link to item Cite

GAUGE SYMMETRY BREAKING IN SUPERCONFORMAL ORBIFOLDS

Journal Article Modern Physics Letters A · March 7, 1991 We study the construction of (2, 0) theories from orbifolds of N=2 minimal superconformal string compactifications with non-trivial Wilson loops. In particular, we exploit the connection between geometrical and exactly soluble string vacua to arri ... Full text Cite

(p, q) string actions

Journal Article Nuclear Physics, Section B · October 8, 1990 We investigate a recently proposed nonperturbative formulation of two-dimensional quantum gravity coupled to (p,q) minimal conformal matter. The coupled differential equations for the partition function summed over topologies are shown to follow from an ac ... Full text Cite

Duality in Calabi-Yau moduli space

Journal Article Nuclear Physics, Section B · July 2, 1990 We describe a duality in the moduli space of string vacua which pairs topologically distinct Calabi-Yau manifolds and shows that the yield isomorphic conformal theories. At the level of the geometrical description, this duality interchanges the roles of Kä ... Full text Cite

Mirror Symmetry and Partition Functions

Journal Article Localization methods have produced explicit expressions for the sphere partition functions of (2,2) superconformal field theories. The mirror symmetry conjecture predicts an IR duality between pairs of Abelian gauged linear sigma models, a class of which d ... Link to item Cite

A (0,2) Mirror Duality

Internet Publication We construct a class of exactly solved (0,2) heterotic compactifications, similar to the (2,2) models constructed by Gepner. We identify these as special points in moduli spaces containing geometric limits described by non-linear sigma models on complete ... Open Access Link to item Cite