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Modality-Constrained Density Estimation via Deformable Templates (2021)
Journal Article
Dasgupta, S., Pati, D., Jermyn, I. H., & Srivastava, A. (2021). Modality-Constrained Density Estimation via Deformable Templates. Technometrics, 63(4), 536-547. https://doi.org/10.1080/00401706.2020.1867647

Estimation of a probability density function (pdf) from its samples, while satisfying certain shape constraints, is an important problem that lacks coverage in the literature. This article introduces a novel geometric, deformable template constrained... Read More about Modality-Constrained Density Estimation via Deformable Templates.

Justified Stories with Agent-Based Modelling for Local COVID-19 Planning (2021)
Journal Article
Badham, J., Barbrook-Johnson, P., Caiado, C., & Castellani, B. (2021). Justified Stories with Agent-Based Modelling for Local COVID-19 Planning. Journal of Artificial Societies and Social Simulation, 24(1), Article 8. https://doi.org/10.18564/jasss.4532

This paper presents JuSt-Social, an agent-based model of the COVID-19 epidemic with a range of potential social policy interventions. It was developed to support local authorities in North East England who are making decisions in a fast moving crisis... Read More about Justified Stories with Agent-Based Modelling for Local COVID-19 Planning.

G 4 flux, algebraic cycles and complex structure moduli stabilization (2021)
Journal Article
Braun, A., & Valandro, R. (2021). G 4 flux, algebraic cycles and complex structure moduli stabilization. Journal of High Energy Physics, 2021(1), Article 207. https://doi.org/10.1007/jhep01%282021%29207

We construct G4 fluxes that stabilize all of the 426 complex structure moduli of the sextic Calabi-Yau fourfold at the Fermat point. Studying flux stabilization usually requires solving Picard-Fuchs equations, which becomes unfeasible for models with... Read More about G 4 flux, algebraic cycles and complex structure moduli stabilization.

N = 7 On-shell diagrams and supergravity amplitudes in momentum twistor space (2021)
Journal Article
Armstrong, C., Farrow, J. A., & Lipstein, A. E. (2021). N = 7 On-shell diagrams and supergravity amplitudes in momentum twistor space. Journal of High Energy Physics, 2021(1), Article 181. https://doi.org/10.1007/jhep01%282021%29181

We derive an on-shell diagram recursion for tree-level scattering amplitudes in N = 7 supergravity. The diagrams are evaluated in terms of Grassmannian integrals and momentum twistors, generalising previous results of Hodges in momentum twistor space... Read More about N = 7 On-shell diagrams and supergravity amplitudes in momentum twistor space.

The construction of Green currents and singular theta lifts for unitary groups (2021)
Journal Article
Funke, J., & Hofmann, E. (2021). The construction of Green currents and singular theta lifts for unitary groups. Transactions of the American Mathematical Society, 374(4), 2909-2947. https://doi.org/10.1090/tran/8289

With applications in the Kudla program in mind we employ singular theta lifts for the reductive dual pair $ \mathrm {U}(p,q)\times \mathrm {U}(1,1)$ to construct two different kinds of Green forms for codimension $ q$-cycles in Shimura varieties asso... Read More about The construction of Green currents and singular theta lifts for unitary groups.

From Pseudostreamer Jets to Coronal Mass Ejections: Observations of the Breakout Continuum (2021)
Journal Article
Kumar, P., Karpen, J. T., Antiochos, S. K., Wyper, P. F., DeVore, C. R., & Lynch, B. J. (2021). From Pseudostreamer Jets to Coronal Mass Ejections: Observations of the Breakout Continuum. Astrophysical Journal, 907(1), https://doi.org/10.3847/1538-4357/abca8b

The magnetic breakout model, in which reconnection in the corona leads to destabilization of a filament channel, explains numerous features of eruptive solar events, from small-scale jets to global-scale coronal mass ejections (CMEs). The underlying... Read More about From Pseudostreamer Jets to Coronal Mass Ejections: Observations of the Breakout Continuum.

Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes (2021)
Journal Article
Uritsky, V., DeForest, C., Karpen, J., DeVore, C., Kumar, P., Raouafi, N., & Wyper, P. (2021). Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes. Astrophysical Journal, 907(1), https://doi.org/10.3847/1538-4357/abd186

Solar coronal plumes long seemed to possess a simple geometry supporting spatially coherent, stable outflow without significant fine structure. Recent high-resolution observations have challenged this picture by revealing numerous transient, small-sc... Read More about Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes.

(Mis-)matching type-B anomalies on the Higgs branch (2021)
Journal Article
Niarchos, V., Papageorgakis, C., Pini, A., & Pomoni, E. (2021). (Mis-)matching type-B anomalies on the Higgs branch. Journal of High Energy Physics, 2021, Article 106. https://doi.org/10.1007/jhep01%282021%29106

Building on [1], we uncover new properties of type-B conformal anomalies for Coulomb-branch operators in continuous families of 4D N = 2 SCFTs. We study a large class of such anomalies on the Higgs branch, where conformal symmetry is spontaneously br... Read More about (Mis-)matching type-B anomalies on the Higgs branch.

Instability thresholds for thermal convection in a Kelvin–Voigt fluid of variable order (2021)
Journal Article
Straughan, B. (2022). Instability thresholds for thermal convection in a Kelvin–Voigt fluid of variable order. Rendiconti del Circolo Matematico di Palermo Series 2, 71(1), 187-206. https://doi.org/10.1007/s12215-020-00588-1

We present numerical techniques for calculating instability thresholds in a model for thermal convection in a complex viscoelastic fluid of Kelvin–Voigt type. The theory presented is valid for various orders of an exponential fading memory term, and... Read More about Instability thresholds for thermal convection in a Kelvin–Voigt fluid of variable order.

WASP: a software package for correctly characterizing the topological development of ribbon structures (2021)
Journal Article
Sierzega, Z., Wereszczynski, J., & Prior, C. (2021). WASP: a software package for correctly characterizing the topological development of ribbon structures. Scientific Reports, 11, Article 1527. https://doi.org/10.1038/s41598-020-80851-8

We introduce the Writhe Application Software Package (WASP) which can be used to characterisze the topology of ribbon structures, the underlying mathematical model of DNA, Biopolymers, superfluid vorticies, elastic ropes and magnetic flux ropes. This... Read More about WASP: a software package for correctly characterizing the topological development of ribbon structures.

Classification of non-free Kleinian groups generated by two parabolic transformations (2021)
Journal Article
Akiyoshi, H., Ohshika, K., Parker, J. R., Sakuma, M., & Yoshida, H. (2021). Classification of non-free Kleinian groups generated by two parabolic transformations. Transactions of the American Mathematical Society, 374(3), 1765-1814. https://doi.org/10.1090/tran/8246

We give a full proof to Agol's announcement on the classification of non-free Kleinian groups generated by two parabolic transformations.

Resurgent expansion of Lambert series and iterated Eisenstein integrals (2021)
Journal Article
Dorigoni, D., & Kleinschmidt, A. (2021). Resurgent expansion of Lambert series and iterated Eisenstein integrals. Communications in Number Theory and Physics, 15(1), 1-57. https://doi.org/10.4310/cntp.2021.v15.n1.a1

We consider special Lambert series as generating functions of divisor sums and determine their complete transseries expansion near rational roots of unity. Our methods also yield new insights into the Laurent expansions and modularity properties of i... Read More about Resurgent expansion of Lambert series and iterated Eisenstein integrals.

Quantum computing for quantum tunneling (2021)
Journal Article
Abel, S., Chancellor, N., & Spannowsky, M. (2021). Quantum computing for quantum tunneling. Physical Review D, 103(1), Article 016008. https://doi.org/10.1103/physrevd.103.016008

We demonstrate how quantum field theory problems can be practically encoded by using a discretization of the field theory problem into a general Ising model, with the continuous field values being encoded into Ising spin chains. To illustrate the met... Read More about Quantum computing for quantum tunneling.

Kesten-McKay law for the Markoff surface mod p (2021)
Journal Article
Courcy-Ireland, M. D., & Magee, M. (2021). Kesten-McKay law for the Markoff surface mod p. Annales Henri Lebesgue, 4, 227-250. https://doi.org/10.5802/ahl.71

For each prime p, we study the eigenvalues of a 3-regular graph on roughly vertices constructed from the Markoff surface. We show they asymptotically follow the Kesten–McKay law, which also describes the eigenvalues of a random regular graph. The pro... Read More about Kesten-McKay law for the Markoff surface mod p.

Ricci curvature and eigenvalue estimates for the magnetic Laplacian on manifolds (2021)
Journal Article
Egidi, M., Liu, S., Muench, F., & Peyerimhoff, N. (2021). Ricci curvature and eigenvalue estimates for the magnetic Laplacian on manifolds. Communications in Analysis and Geometry, 29(5), 1127-1156. https://doi.org/10.4310/cag.2021.v29.n5.a4

In this paper, we present a Lichnerowicz type estimate and (higher order) Buser type estimates for the magnetic Laplacian on a closed Riemannian manifold with a magnetic potential. These results relate eigenvalues, magnetic fields, Ricci curvature, a... Read More about Ricci curvature and eigenvalue estimates for the magnetic Laplacian on manifolds.