Accelerating Solitons

Speaker: Andrew Royston (Pennsylvania State University)Host: Falk Hassler

We show that the leading semiclassical behavior of soliton form factors at arbitrary momentum transfer is controlled by solutions to a new wave-like integro-differential equation that describes solitons undergoing acceleration. We work in the context of two-dimensional linear sigma models for concreteness, but our methods are purely semiclassical and generalizable.  [...]

• High Energy Theory

Linearized Supergeometry of 11D,N =1⁄8 Superspace

Speaker: Anindya Sengupta (Texas A&M University)Host: Falk Hassler

In 1978, Cremmer, Julia, and Scherk wrote down a (component) theory of eleven-dimensional Supergravity. Soon, in 1980, Brink and Howe gave a superspace formulation of this theory. The component theory required that dynamical fields to be on-shell for the closure of 11D,N=1 Supersymmetry. The same on-shell requirement followed from the [...]

• High Energy Theory

Worldsheet Correlators in AdS3

Speaker: Lorenz Eberhardt (Institute for Advanced Study)Host: Falk Hassler

We revisit the computation of string correlation functions in AdS3 with pure NS-NS flux from a worldsheet point of view. These correlators contain all the perturbative information about the spacetime CFT and the existence of winding strings in AdS3 makes them very rich. We propose a solution to the problem [...]

• High Energy Theory

The Tadpole Problem

Speaker: Severin Lüst (Harvard University)Host: Falk Hassler

I will discuss string theory compactifications where a large number of moduli is stabilized by fluxes. I will present a conjecture which rules out the stabilization of all complex-structure moduli in F-theory at a generic point in moduli space by fluxes that satisfy the tadpole cancellation condition. Evidence for this [...]

• High Energy Theory

Quantum Minimal Surfaces from Quantum Error Correction

Speaker: Geoff Penington (University of California, Berkeley & IAS)Host: Falk Hassler

We show that complementary state-specific reconstruction of logical (bulk) operators is equivalent to the existence of a quantum minimal surface prescription for physical (boundary) entropies. This significantly generalizes both sides of an equivalence previously shown by Harlow; in particular, we do not require the entanglement wedge to be the same [...]

• High Energy Theory

T-duality and String Alpha’ Corrections

Speaker: James Liu (University of Michigan)Host: Falk Hassler

Although T-duality is an inherently stringy symmetry, it can be seen at the effective field theory level, both in the classical two-derivative action and at the alpha' corrected level.  In fact, T-duality invariance can be a powerful tool in constraining the form of the alpha' corrections.  A particularly interesting framework [...]

• High Energy Theory

Disorder Averaging and its UV (Dis)Contents

Speaker: Jonathan Heckman (University of Pennsylvania)Host: Falk Hassler

We present a stringy construction of ensemble QFTs, thus realizing a disorder averaging over coupling constants. When each member of the ensemble is a CFT with a standard holographic dual, the resulting bulk can be interpreted as a single asymptotically Anti-de Sitter space geometry with multiple boundary components. This provides [...]

• High Energy Theory

Decomposition in Orbifolds, Quantum Symmetries, and Anomalies

Speaker: Daniel Robbins (University of Albany)Host: Falk Hassler

In the context of 2D CFT, decomposition occurs when we construct an orbifold of a theory by gauging a group G that has a trivially-acting subgroup K.  The resulting theory is a disjoint union of orbifolds by subgroups of the effective G/K symmetry.  We'll generalize this old story by first [...]

• High Energy Theory

From Quantum Spacetime to String Theory and Quantum Gravity Phenomenology

Speaker: Djordje Minic (Virginia Tech)Host: Falk Hassler

Quantum gravity effects are traditionally tied to short distances and high energies. In this talk we argue that, perhaps surprisingly, quantum gravity may have important consequences for the phenomenology of the infrared. We center our discussion around a conception of quantum gravity involving a notion of quantum spacetime that arises [...]

• High Energy Theory

Lessons and Surprises from Kaluza-Klein Spectra

Speaker: Gabriel Larios (Institute of Theoretical Physics, Madrid)Host: Falk Hassler

Infinite towers of massive modes arise for every compactification of higher dimensional theories. Understanding the properties of these Kaluza-Klein towers on non-trivial solutions with an AdS factor has been a longstanding issue with clear holographic interest, as they describe the spectrum of single-trace operators of the dual CFTs at strong [...]

• High Energy Theory

Generalised Geometry and Consistent Truncation

Speaker: Grégoire Josse (LPTHE, Sorbonne Universite, Paris)Host: Falk Hassler

In this talk I will present how the generalized geometry framework provides a systematic and simple way to derive consistent truncation of ten and eleven dimension supergravity to any dimension and any amount of supersymmetry.

• High Energy Theory

Towards Exact matter spectra of F-theory Minimal Supersymmetric Standard Models

Speaker: Mirjam Cvetic (University of Pennsylvania)Host: Falk Hassler

Within the largest, currently known, class of one Quadrillion globally consistent F-theory Standard Models with gauge coupling unification and no chiral exotics, we present advances in the determination of the full matter spectra, which are governed by fractional powers of line bundles, also known as root bundles on matter curves. [...]

• High Energy Theory

TBA

Speaker: Murat Gunaydin (Penn State University)Host: Falk Hassler

Virtual Seminar: Zoom Link TBA

• High Energy Theory