String Phenomenology 2025

Session

Parallel Session 2

8 Jul 2025, 13:30

ISEC (Northeastern University)

325. No Need To Be Vexed: CY Hypersurfaces from Reflexive Polytopes Beyond FRSTs

Elijah Sheridan

08/07/2025, 13:30

The Krezuer-Skarke (KS) database of toric hypersurface Calabi-Yau (CY) threefolds arising from fine, regular, star triangulations (FRSTs) of 4D reflexive polytopes—following Batyrev's original construction—has long provided an important setting for explicit model building in string phenomenology. It is known, however, that the Kahler moduli spaces of KS Calabi-Yau geometries are not fully...

326. No Shift, Sherlock

José Calderón-Infante

08/07/2025, 13:48

In this talk, I will present a novel CFT-based argument against continuous shift symmetries in AdS/CFT. Unlike other global symmetries, continuous scalar shift symmetries have a clear CFT counterpart: the existence of a conformal manifold along which the CFT data does not change. This allows us to ask whether a local and unitary CFT can exhibit such a property. We provide a purely CFT argument...

327. Kernel Bundles with Real and Symplectic Structure

Andrew Turner

08/07/2025, 14:06

The monad bundle construction is a useful tool to build a large class of holomorphic, polystable vector bundles for use in heterotic string compactifications. While it is well-known how to construct monad bundles with SU(n) structure, constructing monad bundles with reduced structure groups remains relatively unexplored. In this talk, we will introduce new techniques to construct kernel...

328. Fermionic Gauge Symmetry in Target Space Duality

Sunit Patil

08/07/2025, 14:24

TBA

329. Computation of the index on orbifold

Maki Takeuchi

08/07/2025, 14:42

We investigate the independent chiral zero modes on the orbifolds from the Atiyah-Segal- Singer fixed point theorem. The required information for this calculation includes the fixed points of the orbifold and the manner in which the spatial symmetries act on these points, unlike previous studies that necessitated the calculation of zero modes. Since the fixed point theorem can be applied to...

330. Insights on Black Hole Stability from Light Towers

Matteo Zatti

08/07/2025, 15:30

We revisit and study quantum corrections to the supersymmetric
entropy of BPS black holes in 4d N=2 supergravity, which can be obtained
from Type IIA string theory compactified on a Calabi–Yau threefold.
Macroscopically, these corrections arise from an infinite series of
higher-derivative F-terms that encode modifications to the
two-derivative supergravity effective action. They result...

331. Gluing Black Hole Entropies Across Dimensions

Alberto Castellano Mora

08/07/2025, 15:48

We investigate quantum corrections to the supersymmetric entropy of BPS black holes in 4d N=2 effective field theories, derived from Type IIA string theory on a Calabi–Yau threefold. These corrections arise from an infinite series of higher-derivative F-terms modifying the two-derivative supergravity action. Within the large volume regime, we analyze their moduli dependence as well as the...

332. Higher-Dimensional Fermionic SYK Model in IR Region

Chen-Te Ma

08/07/2025, 16:06

We study the 2D fermionic SYK model with Majorana fermions, featuring a kinetic term with a quartic expression and a $2q$-body interaction with Gaussian disorder. By minimizing the effective action or solving the SD equation for $q=1$, we determine that the appropriate ansatz involves zero spins. Our computation of the Lyapunov exponent shows violations of chaos and unitarity bounds. The...

333. Vanishing Terms in Heterotic Effective Theories

James Gray

08/07/2025, 16:24

TBA

334. Non-geometric compactifications from Landau-Ginzburg models

Miguel Morros

08/07/2025, 16:42

One of the challenges of Calabi-Yau compactifications is to stabilise the complex structure and Kähler moduli corresponding to the deformations of the internal space. If they were left massless, they would give rise to phenomenologically irrelevant string vacua. In type IIB string theory, only complex structure moduli can be stabilised by turning on fluxes in the internal space. Besides, the...

355. $G_2$-manifolds from Diophantine equations

Jakob Moritz

10/07/2025, 13:30

I will argue that perturbatively flat vacua of type IIB string theory are dual to M-theory compactifications on $G_2$-manifolds without four-form flux. As a consequence, one can, implicitly, construct enormous numbers of $G_2$-manifolds by solving Diophantine equations in type IIB flux quanta. This duality can be used to compute warping corrections to the Kähler potential and Kähler...

356. (-1)-form symmetries and SymTFT

Subham Roy

10/07/2025, 13:48

TBA

357. Decoding IR Dualities and Phases with Quad-CFTs in N=1 SU(N) Gauge Theories

Ajit Kumar

10/07/2025, 14:06

In this talk, I will discuss ​about our work on understanding the infrared (IR) dynamics of four-dimensional N=1 SU(N) chiral gauge theories with antisymmetric or symmetric rank-2 tensor matter. While Seiberg duality has been instrumental in constructing dual descriptions for theories with fundamental and anti-fundamental matter a systematic duality framework is lacking for tensorial theories....

358. Navigating the T-Duality Landscape of Little String Theories

Hamza Ahmed

10/07/2025, 14:24

In this talk, we explore the phenomenological potential of heterotic line bundle models as a promising framework for deriving the Standard Model from string theory. We present a systematic approach to constrain the low-energy effective theories derived from such compactifications using remnants of anomalous U(1) symmetries to retrieve realistic quarks and leptons masses, mixing patterns and...

359. Non-invertible Symmetries and a Categorified Bagger–Witten Line Bundle in Exceptional Holonomy

Xingyang Yu

10/07/2025, 14:42

In Calabi–Yau compactifications, the Bagger–Witten line bundle captures how the $U(1)_R$ symmetry varies over SCFT moduli space. For compactifications on $\mathrm{Spin}(7)$ and $G_2$ manifolds, the worldsheet theories include Ising and tricritical Ising sectors, whose non-invertible fusion categorical symmetries generalize the role of $U(1)_R$. In this talk, I propose a categorified version of...

360. Non-geometric string vacua

Muthusamy Rajaguru

10/07/2025, 15:30

In this talk, we discuss various aspects of Minkowski vacua arising in the $1^9$ and $2^6$ Landau-Ginzburg Models. In particular, we present fully stabilized $\mathcal{N}=1$ Minkowski vacua and violations of the refined tadpole conjecture. We also comment on symmetry arguments that could potentially explain the existence of flat directions in these models.

361. SymTFT Entanglement and Holographic (Non)-Factorization

Ethan Torres

10/07/2025, 15:48

Symmetry topological field theories (SymTFTs) have been very useful tools in recent years for studying the generalized symmetries and 't Hooft anomalies of QFTs. When a QFT has a semiclassical holographic dual, there is typically a neat dictionary between the SymTFT data and configurations of various branes in the string background. In this talk, we will address such a dictionary in cases...

362. (Quadratically) Refined Discrete Anomaly Cancellation

Michelangelo Tartaglia

10/07/2025, 16:06

TBA

363. Rediscovering the Standard Model with AI

Pellegrino Piantadosi

10/07/2025, 16:24

TBA

364. Searching for new Special Lagrangians with Quality-Diversity Optimization

Yidi Qi

10/07/2025, 16:42

Special Lagrangian (sLags) submanifolds are crucial objects for string phenomenology and the SYZ conjecture, yet their explicit construction remains a significant challenge in geometry. In this talk, we introduce a novel computational framework to tackle this problem. Using the Fermat Quintic as a primary testbed, our approach leverages a Quality-Diversity (QD) search algorithm to navigate...