String Phenomenology 2023

Session

Parallel

Jul 4, 2023, 2:00 PM

Institute for Basic Science, Daejeon

Conveners

Parallel: Tue 1-A

• Tatsuo Kobayashi

Parallel: Tue 2-A

• Fabian Ruehle

Parallel: Thu 1-A

• Kang-Sin Choi

Parallel: Thu 2-A

• Sungjay Lee

46. Upper bound on the Atiyah–Singer index from tadpole cancellation

Hajime Otsuka

7/4/23, 2:00 PM

I will discuss upper bounds on the generation number of chiral zero-modes in heterotic and Type II string theories. We find that tadpole cancellation conditions lead to the small generation number of quarks and leptons.

47. Blow-up of magnetized T^2/Z_N and index theorem

Maki Takeuchi

7/4/23, 2:15 PM

The number of zero modes of magnetized T^2/Z_N orbifold have been obtained in previous paper. However, due to the existence of singularities in the orbifold, the Atiyah-Singer index theorem cannot be applied, and hence the physical/geometrical meaning of the zero mode number has not been clear. To apply the Atiyah-Singer to the model, we replace the T^2/Z_N orbifold by a smooth manifold...

48. Small Kinetic Mixing in String Theory

Ruben Kuespert

7/4/23, 2:30 PM

Kinetic mixing between gauge fields of different U(1) factors is a well-studied phenomenon in 4d EFT. In string compactifications with U(1)s from sequestered D-brane sectors, kinetic mixing becomes a key target for the UV prediction of a phenomenologically important EFT operator. Surprisingly, in many cases kinetic mixing is absent due to a non-trivial cancellation. In particular, D3-D3...

49. Phenomenology in magnetized orbifold models

Shohei Takada

7/4/23, 2:45 PM

We consider magnetized orbifold models to realize three-generation structure, mass hierarchy in the Standard model. In particular, we focus on the theory compactified on six-dimensional orbifolds, not on two-dimensional ones.

50. A dataset of R-symmetric Wess-Zumino models

Zheng Sun

7/4/23, 3:00 PM

We made an exhaustive search for generic R-symmetric Wess-Zumino models with up to 5 chiral fields, and checked the consistency of their vacuum solutions with predictions from the Nelson-Seiberg theorem and its generalization. Each model is recorded as the R-charge assignment of fields, which uniquely determines the cubic polynomial superpotentials with generic coefficients. The resulting...

51. Meson scattering from string scattering in holographic QCD

Dorin Weissman

7/4/23, 3:15 PM

We present a detailed study of the applications of holographic QCD to the scattering of mesons. The starting point is that mesons are described as strings in curved confining backgrounds. We show how, through holography, we can modernize the description of hadrons as strings, and how to approach meson scattering in the framework of holography.

52. Axion-Photon Couplings in the String Landscape

Naomi Gendler

7/4/23, 4:00 PM

In this talk, I will review the construction of an ensemble of axion models arising from type IIB string theory on toric hypersurface Calabi-Yau threefold orientifolds. I’ll explain some of the observational constraints on these string theory axions, coming from dark matter bounds as well as axion-photon coupling experiments. Finally, I’ll explain a mechanism that suppresses axion-photon...

53. Line bundle cohomology

Andrei Constantin

7/4/23, 4:15 PM

The first part of the talk outlines the need for ultra-fast cohomology computations in heterotic model building. The second part presents some new results on line bundle cohomology on certain complex varieties of various dimensions and types (including Calabi-Yau threefolds), in particular in relation to generating functions.

54. Decoding Nature with Nature's Tools

Thomas Harvey

7/4/23, 4:30 PM

In this talk, I will present recent work (2306.03147) on engineering Heterotic Line Bundle realisations of the standard model via genetic algorithms and quantum annealing. We show that these methods are able to efficiently find almost all models within a given range of line bundles, and make use of recently discovered analytic formulae for line bundle cohomology to impose the exact spectrum...

55. How many Calabi-Yau manifolds are known? Placing upper and lower bounds on the Kreuzer-Skarke list.

Cristofero Fraser-Taliente

7/4/23, 4:45 PM

We use Wall's theorem to find bounds on the number of Calabi-Yau manifolds in the Kreuzer-Skarke list for small Picard number. Lower bounds are found using polynomial invariant theory, as well as some further invariants descending from the integral nature of the topological data. A range of computational techniques can then be applied to find explicit isomorphisms between realisations, and...

56. FTheoryTools: A computational tool for analysis of singular elliptic fibrations

Andrew Turner

7/4/23, 5:00 PM

In this talk, I will discuss an upcoming computational tool for analysis of singular elliptic fibrations called FTheoryTools. This tool automates many of the difficult calculations involved in the analysis of F-theory models, and additionally hopes to catalogue and make available many of the constructions that appear throughout the F-theory literature so that anyone may easily do calculations...

57. Fano 3-Folds, Ypk Manifolds and Brane Brick Models

Rak-Kyeong Seong

7/4/23, 5:15 PM

82. Full Landscape of Supersymmetric Pati-Salam Models from Intersection Brane Worlds

Rui Sun

7/6/23, 2:00 PM

We construct a systematic method to complete the landscape of intersecting brane worlds with the example of supersymmetric Pati-Salam models. Moreover, we propose a concrete way to realize all the string-scale gauge coupling relations of generic intersecting brane models via introducing exotic particles.

83. Flavor, CP and Metaplectic Modular Symmetries in Type IIB Chiral Flux Vacua

Takafumi Kai

7/6/23, 2:15 PM

We examine symmetries of chiral four-dimensional vacua of Type IIB flux compactifications with vanishing superpotential W=0. We find that the N=1 supersymmetric MSSM-like and Pati-Salam vacua possess enhanced discrete symmetries in the effective action below the mass scale of stabilized complex structure moduli and dilaton. Furthermore, a generation number of quarks/leptons is small on these...

84. Quark and lepton hierarchies from S4' modular flavor symmetry

Junichiro Kawamura

7/6/23, 2:30 PM

We propose models in which the hierarchical structures of the masses and mixing in both quark and lepton sectors are explained by the S4' modular flavor symmetry near the fixed point Im \tau >> 1. The model provides the first explicit example which explains hierarchies of both quarks and leptons by a single modular flavor symmetry. The hierarchies are realized by powers of \epsilon := e^{2\pi...

85. Root bundles: Applications to F-theory Standard model

Martin Bies

7/6/23, 2:45 PM

Recently, root bundles entered the quest for F-theory standard model constructions without exotic vector-like pairs. I will provide an overview of these developments.

86. Towards natural and realistic E7 GUTs in F-theory

Shing Yan Li

7/6/23, 3:00 PM

We consider phenomenological aspects of a natural class of Standard Model-like supersymmetric F-theory vacua realized through flux breaking of rigid E7 gauge factors. It was shown that three generations of Standard Model matter can arise quite easily in these models. We further find that many other Standard Model-like features can easily be compatible with these constructions. For example,...

87. Hairy Black Holes by Spontaneous Symmetry Breaking

Miok Park

7/6/23, 3:15 PM

We have studied hairy black hole solutions in Einstein(-Maxwell)-scalar-Gauss-Bonnet theory. The scalar field coupling function includes a mass and a quartic interaction term, and that the gravity action has U(1) symmetry. We assumed that the early stage of the formation of hairy black holes from the non-hairy ones, and so we considered the case when the scalar field is small near the black...

88. $(p-1)$-Bracket for D$p$-branes in Large R-R Field Background

Chen-Te Ma

7/6/23, 4:00 PM

The volume-preserving diffeomorphism is a key feature that characterizes the large constant R-R ($p-1$)-form field background in a D$p$-brane theory. It represents a symmetry of the theory that preserves the volume of space. To describe this symmetry, we introduce the concept of the ($p-1$)-bracket, which generates the volume-preserving diffeomorphism. The ($p-1$)-bracket is a mathematical...

89. Generalised Bismut-Lichnerowicz formulae and quantum corrections in string theory

Yi Zhang

7/6/23, 4:15 PM

From a quantum gravity point of view, higher-derivative corrections serve as means of probing String Theory at a fundamental level. Even though the complete expansion involves all fields of the theory, most of the attention has been concentrated on the gravitational action. The gravitational part of the first higher derivative corrections to M-theory, which begins at eight derivatives, has...

90. Strings, D-branes, and supergravities from supermembranes with discrete spectra

Camilo las Heras

7/6/23, 4:30 PM

M2-branes with fluxes correspond to sectors of M-theory on a torus with good quantum behavior, like the discreteness of the supersymmetric spectrum. Consequently, these particular M2-branes may describe microscopical degrees of freedom of, at least, a sector of M-theory. In this talk, we will identify non-perturbative objects of type II string theory that are directly related to M2-brane with...

91. Free Fermionic Webs of Heterotic T-folds

Benjamin Percival

7/6/23, 4:45 PM

Non-geometric string vacua are well know to play a key role in moduli stabilisation. In the context of heterotic orbifolds, models can be studied in terms of fermionic or bosonic formulations. At the heart of the connection between these two constructions is bosonisation that connects a single boson with 2 real fermions in the worldsheet CFT. The freedom to pair up fermions in a large number...

92. Wilson loops, holomorphic anomaly equations and blowup equations

Xin Wang

7/6/23, 5:00 PM

We investigate the topological string correspondence of the five-dimensional half-BPS Wilson loops on S1. First, we propose the refined holomorphic anomaly equations for the BPS sectors of the Wilson loop expectation values. We then solve these equations and obtain many non-trivial novel integral refined BPS invariants for rank-one models. By studying the Wilson loop expectation values around...

93. Finiteness of flux vacua and the tadpole conjecture

Jeroen Monnee

7/6/23, 5:15 PM

Recently, the finiteness of self-dual flux vacua in F-theory has been established using the framework of tame geometry. In this talk, we present an alternative proof using the methods of asymptotic Hodge theory to provide a complementary and more hands-on perspective. This requires a detailed understanding of the nilpotent orbit expansion of the period map for an arbitrary number of complex...

94. Reducing differential systems for Feynman integrals and cosmological correlators

Arno Hoefnagels

7/6/23, 5:30 PM

Many different integrals can be studied by considering them as solutions to differential equations. In this talk I will highlight a particular approach based on Gelfand-Kapranov-Zelevinsky (GKZ) systems, a class of integrals including Feynman integrals, period integrals, cosmological correlators and many more. In this setting it is quit simple to find solutions although these can be unwieldy...