719 citations · 3.5k across the 84 of their papers we have counts for
60 papers · 1 filter
The M-Theory Three-Form and Singular Geometries
R. Donagi, M. Wijnholt
While M- and F-theory compactifications describe a much larger class of vacua than perturbative string compactifications, they typically need singularities to generate non-abelian…
Improved statistics for F-theory standard models
Martin Bies, Mirjam Cvetič, Ron Donagi +1
Much of the analysis of F-theory-based Standard Models boils down to computing cohomologies of line bundles on matter curves. By varying parameters one can degenerate such matter c…
The bad locus in the moduli of super Riemann surfaces with Ramond punctures
Ron Donagi, Nadia Ott
The bad locus in the moduli of super Riemann surfaces with Ramond punctures parametrizes those super Riemann surfaces that have more than the expected number of independent closed…
Brill-Noether-general Limit Root Bundles: Absence of vector-like Exotics in F-theory Standard Models
Martin Bies, Mirjam Cvetič, Ron Donagi +1
Root bundles appear prominently in studies of vector-like spectra of 4d F-theory compactifications. Of particular importance to phenomenology are the Quadrillion F-theory Standard…
Root Bundles and Towards Exact Matter Spectra of F-theory MSSMs
Martin Bies, Mirjam Cvetič, Ron Donagi +2
Motivated by the appearance of fractional powers of line bundles in studies of vector-like spectra in 4d F-theory compactifications, we analyze the structure and origin of these bu…
Families of Hitchin systems and N=2 theories
Aswin Balasubramanian, Jacques Distler, Ron Donagi
Motivated by the connection to 4d theories, we study the global behavior of families of tamely-ramified Hitchin integrable systems as the underlying curve va…
Machine Learning and Algebraic Approaches towards Complete Matter Spectra in 4d F-theory
Martin Bies, Mirjam Cvetic, Ron Donagi +3
Motivated by engineering vector-like (Higgs) pairs in the spectrum of 4d F-theory compactifications, we combine machine learning and algebraic geometry techniques to analyze line b…
Global aspects of moduli spaces of 2d SCFTs
Ron Donagi, Mark Macerato, Eric Sharpe
The Bagger-Witten line bundle is a line bundle over moduli spaces of two-dimensional SCFTs, related to the Hodge line bundle of holomorphic top-forms on Calabi-Yau manifolds. It ha…
Twisted spectral correspondence and torus knots
Wu-yen Chuang, Duiliu-Emanuel Diaconescu, Ron Donagi +2
Cohomological invariants of twisted wild character varieties as constructed by Boalch and Yamakawa are derived from enumerative Calabi-Yau geometry and refined Chern-Simons invaria…
Conformal field theories and compact curves in moduli spaces
Ron Donagi, David R. Morrison
We show that there are many compact subsets of the moduli space of Riemann surfaces of genus that do not intersect any symmetry locus. This has interesting implications f…
BPS states, torus links and wild character varieties
Duiliu-Emanuel Diaconescu, Ron Donagi, Tony Pantev
A string theoretic framework is constructed relating the cohomology of wild character varieties to refined stable pair theory and torus link invariants. Explicit conjectural formul…
Type II String Theory on Calabi-Yau Manifolds with Torsion and Non-Abelian Discrete Gauge Symmetries
Volker Braun, Mirjam Cvetic, Ron Donagi +1
We provide the first explicit example of Type IIB string theory compactification on a globally defined Calabi-Yau threefold with torsion which results in a four-dimensional effecti…
F-Theory Vacua with Z_3 Gauge Symmetry
Mirjam Cvetič, Ron Donagi, Denis Klevers +2
Discrete gauge groups naturally arise in F-theory compactifications on genus-one fibered Calabi-Yau manifolds. Such geometries appear in families that are parameterized by the Tate…
Global aspects of (0,2) moduli space: toric varieties and tangent bundles
Ron Donagi, Zhentao Lu, Ilarion V. Melnikov
We study the moduli space of A/2 half-twisted gauged linear sigma models for NEF Fano toric varieties. Focusing on toric deformations of the tangent bundle, we describe the vacuum…
Super Atiyah classes and obstructions to splitting of supermoduli space
Ron Donagi, Edward Witten
The first obstruction to splitting a supermanifold S is one of the three components of its super Atiyah class, the two other components being the ordinary Atiyah classes on the red…
Parabolic refined invariants and Macdonald polynomials
Wu-yen Chuang, Duiliu-Emanuel Diaconescu, Ron Donagi +1
A string theoretic derivation is given for the conjecture of Hausel, Letellier, and Rodriguez-Villegas on the cohomology of character varieties with marked points. Their formula is…
Supermoduli Space Is Not Projected
Ron Donagi, Edward Witten
We prove that for genus greater than or equal to 5, the moduli space of super Riemann surfaces is not projected (and in particular is not split): it cannot be holomorphically proje…
The Sen Limit
A. Clingher, R. Donagi, M. Wijnholt
F-theory compactifications on elliptic Calabi-Yau manifolds may be related to IIb compactifications by taking a certain limit in complex structure moduli space, introduced by A. Se…
Weak Coupling, Degeneration and Log Calabi-Yau Spaces
R. Donagi, S. Katz, M. Wijnholt
We establish a new weak coupling limit in F-theory. The new limit may be thought of as the process in which a local model bubbles off from the rest of the Calabi-Yau. The construct…
On Seven-Brane Dependent Instanton Prefactors in F-theory
Mirjam Cvetič, Ron Donagi, James Halverson +1
We study the moduli-dependent prefactor of M5-instanton corrections to the superpotential in four-dimensional F-theory compactifications. In light of the M-theory and type IIb limi…
The MSSM Spectrum from (0,2)-Deformations of the Heterotic Standard Embedding
Volker Braun, Philip Candelas, Rhys Davies +1
We construct supersymmetric compactifications of E_8 \times E_8 heterotic string theory which realise exactly the massless spectrum of the Minimal Supersymmetric Standard Model (MS…
Gluing Branes II: Flavour Physics and String Duality
R. Donagi, M. Wijnholt
Recently we discussed new aspects of degenerate brane configurations, which can appear in the context of heterotic strings, perturbative type II, or M/F-theory. Here we continue ou…
Gluing Branes, I
Ron Donagi, Martijn Wijnholt
We consider several aspects of holomorphic brane configurations. We recently showed that an important part of the defining data of such a configuration is the gluing morphism, whic…
MSW Instantons
Ron Donagi, Martijn Wijnholt
We analyze M5-instantons in F-theory, or equivalently D3-instantons with varying axio-dilaton, in the presence of 7-brane gauge groups. The chiral two-form on the M5-brane plays an…