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Trivalent expanders, $(Delta – Y)$-transformation, and hyperbolic surfaces (2019)
Journal Article
Ivrissimtzis, I., Peyerimhoff, N., & Vdovina, A. (2019). Trivalent expanders, $(Delta – Y)$-transformation, and hyperbolic surfaces. Groups, Geometry, and Dynamics, 13(3), 1103-1131. https://doi.org/10.4171/ggd/518

We construct a new family of trivalent expanders tessellating hyperbolic surfaces with large isometry groups. These graphs are obtained from a family of Cayley graphs of nilpotent groups via (Delta–Y)-transformations. We study combinatorial, topologi... Read More about Trivalent expanders, $(Delta – Y)$-transformation, and hyperbolic surfaces.

Cutting sequences on Bouw-Moeller surfaces: an S-adic characterization (2019)
Journal Article
Davis, D., Pasquinelli, I., & Ulcigrai, C. (2019). Cutting sequences on Bouw-Moeller surfaces: an S-adic characterization. Annales Scientifiques de l’École Normale Supérieure, 52(4), 927-1023. https://doi.org/10.24033/asens.2401

Résumé. On considère un codage symbolique des géodésiques sur une famille de surfaces de Veech (surfaces de translation riches en symétries affines) récemment découverte par Bouw et Möller. Ces surfaces, comme l’a remarqué Hooper, peuvent être réalis... Read More about Cutting sequences on Bouw-Moeller surfaces: an S-adic characterization.

Exploring Flaring Behaviour on Low Mass Stars, Solar-type Stars and the Sun (2019)
Journal Article
Doyle, L., Ramsay, G., Doyle, J., Wyper, P., Scullion, E., Wu, K., & McLaughlin, J. (2019). Exploring Flaring Behaviour on Low Mass Stars, Solar-type Stars and the Sun. Proceedings of the International Astronomical Union, 15(S354), 384-319. https://doi.org/10.1017/s1743921319009980

We report on our project to study the activity in both the Sun and low mass stars. Utilising high cadence, Hα observations of a filament eruption made using the CRISP spectropolarimeter mounted on the Swedish Solar Telescope has allowed us to determi... Read More about Exploring Flaring Behaviour on Low Mass Stars, Solar-type Stars and the Sun.

Infinite rank surface cluster algebras (2019)
Journal Article
Canakci, I., & Felikson, A. (2019). Infinite rank surface cluster algebras. Advances in Mathematics, 352, 862-942. https://doi.org/10.1016/j.aim.2019.06.008

We generalise surface cluster algebras to the case of infinite surfaces where the surface contains finitely many accumulation points of boundary marked points. To connect different triangulations of an infinite surface, we consider infinite mutation... Read More about Infinite rank surface cluster algebras.

Exclusive vector meson production in heavy ion collisions (2019)
Journal Article
Khoze, V., Martin, A., & Ryskin, M. (2019). Exclusive vector meson production in heavy ion collisions. Journal of Physics G: Nuclear and Particle Physics, 46(8), Article 085002. https://doi.org/10.1088/1361-6471/ab2009

We discuss the salient features of exclusive vector meson production in heavy ion collisions at LHC energies. Special attention is paid to the space-time picture of the process. We account for both coherent and incoherent contributions. The explicit... Read More about Exclusive vector meson production in heavy ion collisions.

Reconstructing solar magnetic fields from historical observations : IV. Testing the reconstruction method (2019)
Journal Article
Virtanen, I., Virtanen, I., Pevtsov, A., Bertello, L., Yeates, A., & Mursula, K. (2019). Reconstructing solar magnetic fields from historical observations : IV. Testing the reconstruction method. Astronomy & Astrophysics, 627(A11), Article A11. https://doi.org/10.1051/0004-6361/201935606

Abstract Aims. The evolution of the photospheric magnetic field has only been regularly observed since the 1970s. The absence of earlier observations severely limits our ability to understand the long-term evolution of solar magnetic fields, especial... Read More about Reconstructing solar magnetic fields from historical observations : IV. Testing the reconstruction method.

Quantum anomalies in Ar(1) Toda theories with defects (2019)
Journal Article
Penati, S., & Polvara, D. (2019). Quantum anomalies in Ar(1) Toda theories with defects. Journal of High Energy Physics, 2019(6), Article 62. https://doi.org/10.1007/jhep06%282019%29062

We study quantum integrability of ane Toda theories with a line of defect. In particular, we focus on the problem of constructing quantum higher-spin conserved currents in models dened by two A(1) r Toda theories separated by a non-trivial type-I def... Read More about Quantum anomalies in Ar(1) Toda theories with defects.

Competing risks survival analysis of ruptured gas pipelines: A nonparametric predictive approach (2019)
Journal Article
Tee, K. F., Pesinis, K., & Coolen-Maturi, T. (2019). Competing risks survival analysis of ruptured gas pipelines: A nonparametric predictive approach. International Journal of Pressure Vessels and Piping, 175, Article 103919. https://doi.org/10.1016/j.ijpvp.2019.06.001

Risk analysis based on historical failure data can form an integral part of the integrity management of oil and gas pipelines. The scarcity and lack of consistency in the information provided by major incident databases leads to non-specific results... Read More about Competing risks survival analysis of ruptured gas pipelines: A nonparametric predictive approach.

The planning problem in mean field games as regularized mass transport (2019)
Journal Article
Graber, P. J., Mészáros, A. R., Silva, F. J., & Tonon, D. (2019). The planning problem in mean field games as regularized mass transport. Calculus of Variations and Partial Differential Equations, 58(3), Article 115. https://doi.org/10.1007/s00526-019-1561-9

In this paper, using variational approaches, we investigate the first order planning problem arising in the theory of mean field games. We show the existence and uniqueness of weak solutions of the problem in the case of a large class of Hamiltonians... Read More about The planning problem in mean field games as regularized mass transport.