Jacob McNamara
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View article: GSO Defects: IIA/IIB Walls and the Surprisingly Stable $\mathrm{R}7$-Brane
GSO Defects: IIA/IIB Walls and the Surprisingly Stable $\mathrm{R}7$-Brane Open
The recently proposed Swampland Cobordism Conjecture predicts the existence of new non-supersymmetric objects which supplement the spectrum of low-energy gravitational effective field theories. In this paper, we study a subset of these def…
View article: Fate of stringy noninvertible symmetries
Fate of stringy noninvertible symmetries Open
Noninvertible symmetries in quantum field theory (QFT) generalize the familiar product rule of groups to a more general fusion rule. In many cases, gauged versions of these symmetries can be regarded as dual descriptions of invertible gaug…
View article: Wormhole Renormalization: The gravitational path integral, holography, and a gauge group for topology change
Wormhole Renormalization: The gravitational path integral, holography, and a gauge group for topology change Open
We study the Factorization Paradox from the bottom up by adapting methods from perturbative renormalization. Just as quantum field theories are plagued with loop divergences that need to be cancelled systematically by introducing counterte…
View article: On the Fate of Stringy Non-Invertible Symmetries
On the Fate of Stringy Non-Invertible Symmetries Open
Non-invertible symmetries in quantum field theory (QFT) generalize the familiar product rule of groups to a more general fusion rule. In many cases, gauged versions of these symmetries can be regarded as dual descriptions of invertible gau…
View article: Non-standard axion electrodynamics and the dual Witten effect
Non-standard axion electrodynamics and the dual Witten effect Open
View article: Running decompactification, sliding towers, and the distance conjecture
Running decompactification, sliding towers, and the distance conjecture Open
A bstract We study towers of light particles that appear in infinite-distance limits of moduli spaces of 9-dimensional $$ \mathcal{N} $$ = 1 string theories, some of which notably feature decompactification limits with running string cou…
View article: Non-standard axion electrodynamics and the dual Witten effect
Non-standard axion electrodynamics and the dual Witten effect Open
Standard axion electrodynamics has two closely related features. First, the coupling of a massless axion field to photons is quantized, in units proportional to the electric gauge coupling squared. Second, the equations of motion tell us t…
View article: Running Decompactification, Sliding Towers, and the Distance Conjecture
Running Decompactification, Sliding Towers, and the Distance Conjecture Open
We study towers of light particles that appear in infinite-distance limits of moduli spaces of 9-dimensional $\mathcal{N}=1$ string theories, some of which notably feature decompactification limits with running string coupling. The lightes…
View article: Geometry and Strings 2023
Geometry and Strings 2023 Open
The proposal details plans for an upcoming meeting as part of the annual Geometry and Strings conference series. This\nseries was formerly known as the ``F-theory'' conference series and has since broadened to include more general approach…
View article: Reflections on Parity Breaking
Reflections on Parity Breaking Open
Parity and CP symmetries are broken in the world around us. Nonetheless, parity (or CP) may be a gauge symmetry which is higgsed in our universe. This is assumed in many scenarios for physics beyond the Standard Model, including the classi…
View article: Chern-Weil global symmetries and how quantum gravity avoids them
Chern-Weil global symmetries and how quantum gravity avoids them Open
View article: Non-invertible global symmetries and completeness of the spectrum
Non-invertible global symmetries and completeness of the spectrum Open
View article: Gravitational Solitons and Completeness
Gravitational Solitons and Completeness Open
We show that gravitational solitons naturally carry gauge charges beyond those of any local quantum field. The effect of these charged excitations is to break a non-invertible symmetry to its maximal group-like sub-symmetry. Taking these c…
View article: Baby Universes, Holography, and the Swampland
Baby Universes, Holography, and the Swampland Open
On the basis of a number of Swampland conditions, we argue that the Hilbert space of baby universe states must be one-dimensional in a consistent theory of quantum gravity. This scenario may be interpreted as a type of "Gauss's law for ent…
View article: Cobordism Classes and the Swampland
Cobordism Classes and the Swampland Open
We argue that any proposed quantum theory of gravity with non-trivial cobordism classes in the space of configurations belongs to the Swampland. The argument is based on the assumption that there are no global symmetries in a consistent th…
View article: Topological Chern-Simons/Matter Theories
Topological Chern-Simons/Matter Theories Open
We propose a new partially topological theory in three dimensions which couples Chern-Simons theory to matter. The 3-manifolds needed for this construction admit transverse holomorphic foliation (THF). The theory depends only on the choice…