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From celestial correlators to AdS, and back (2023)
Journal Article
Iacobacci, L., Sleight, C., & Taronna, M. (2023). From celestial correlators to AdS, and back. Journal of High Energy Physics, 2023(6), Article 53. https://doi.org/10.1007/jhep06%282023%29053

We present a general relation between celestial correlation functions in d-dimensions and Witten diagrams in (d + 1)-dimensional Euclidean anti-de Sitter (EAdS) space, to all orders in perturbation theory. Contact diagram processes are proportional t... Read More about From celestial correlators to AdS, and back.

Bakry–Émery Curvature Sharpness and Curvature Flow in Finite Weighted Graphs. Implementation (2023)
Journal Article
Cushing, D., Kamtue, S., Liu, S., Münch, F., Peyerimhoff, N., & Snodgrass, B. (2023). Bakry–Émery Curvature Sharpness and Curvature Flow in Finite Weighted Graphs. Implementation. Axioms, 12(6), Article 577. https://doi.org/10.3390/axioms12060577

In this paper, we discuss the implementation of a curvature flow on weighted graphs based on the Bakry–Émery calculus. This flow can be adapted to preserve the Markovian property and its limits as time goes to infinity turn out to be curvature sharp... Read More about Bakry–Émery Curvature Sharpness and Curvature Flow in Finite Weighted Graphs. Implementation.

Causality in heliophysics: Magnetic fields as a bridge between the Sun’s interior and the Earth’s space environment (2023)
Journal Article
Nandy, D., Baruah, Y., Bhowmik, P., Dash, S., Gupta, S., Hazra, S., …Sinha, S. (2023). Causality in heliophysics: Magnetic fields as a bridge between the Sun’s interior and the Earth’s space environment. Journal of Atmospheric and Solar-Terrestrial Physics, 248, Article 106081. https://doi.org/10.1016/j.jastp.2023.106081

Our host star, the Sun, is a middle-aged main sequence G type star whose activity varies. These variations are primarily governed by solar magnetic fields which are produced in the Sun’s interior via a magnetohydrodynamic dynamo mechanism. Solar acti... Read More about Causality in heliophysics: Magnetic fields as a bridge between the Sun’s interior and the Earth’s space environment.

Symmetry TFTs from String Theory (2023)
Journal Article
Apruzzi, F., Bonetti, F., García Etxebarria, I., Hosseini, S. S., & Schäfer-Nameki, S. (2023). Symmetry TFTs from String Theory. Communications in Mathematical Physics, 402(1), 895-949. https://doi.org/10.1007/s00220-023-04737-2

We determine the d+1 dimensional topological field theory, which encodes the higher-form symmetries and their ’t Hooft anomalies for d-dimensional QFTs obtained by compactifying M-theory on a non-compact space X. The resulting theory, which we call t... Read More about Symmetry TFTs from String Theory.

A generalized system reliability model based on survival signature and multiple competing failure processes (2023)
Journal Article
Chang, M., Coolen, F., Coolen-Maturi, T., & Huang, X. (2023). A generalized system reliability model based on survival signature and multiple competing failure processes. Journal of Computational and Applied Mathematics, Article 115364. https://doi.org/10.1016/j.cam.2023.115364

Degradation-based system reliability analysis has been extensively conducted, but the components in a system are assumed to experience similar degradation and shock processes, neglecting actual failure mechanisms. However, multiple types of component... Read More about A generalized system reliability model based on survival signature and multiple competing failure processes.

Stabilization estimates for the Brinkman–Forchheimer–Kelvin–Voigt equation backward in time (2023)
Journal Article
Gentile, M., & Straughan, B. (2023). Stabilization estimates for the Brinkman–Forchheimer–Kelvin–Voigt equation backward in time. Acta Mechanica, 234(9), 4001-4009. https://doi.org/10.1007/s00707-023-03592-5

The final value value problem for the Brinkman–Forchheimer–Kelvin–Voigt equations is analysed for quadratic and cubic types of Forchheimer nonlinearity. The main term in the Forchheimer equations is allowed to be fully anisotropic. It is shown that t... Read More about Stabilization estimates for the Brinkman–Forchheimer–Kelvin–Voigt equation backward in time.

Optimal Control of Probability on A Target Set for Continuous-Time Markov Chains (2023)
Journal Article
Ma, C., & Zhao, H. (2023). Optimal Control of Probability on A Target Set for Continuous-Time Markov Chains. IEEE Transactions on Automatic Control, https://doi.org/10.1109/tac.2023.3278789

In this paper, a stochastic optimal control problem is considered for a continuous-time Markov chain taking values in a denumerable state space over a fixed finite horizon. The optimality criterion is the probability that the process remains in a tar... Read More about Optimal Control of Probability on A Target Set for Continuous-Time Markov Chains.

Spherical winding and helicity (2023)
Journal Article
Xiao, D., Prior, C., & Yeates, A. (2023). Spherical winding and helicity. Journal of Physics A: Mathematical and Theoretical, 56(20), Article 205201. https://doi.org/10.1088/1751-8121/accc17

In ideal magnetohydrodynamics, magnetic helicity is a conserved dynamical quantity and a topological invariant closely related to Gauss linking numbers. However, for open magnetic fields with non-zero boundary components, the latter geometrical inter... Read More about Spherical winding and helicity.