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Coronal Holes and Open Magnetic Flux over Cycles 23 and 24 (2016)
Journal Article
Lowder, C., Qiu, J., & Leamon, R. (2016). Coronal Holes and Open Magnetic Flux over Cycles 23 and 24. Solar Physics, 292(1), Article 18. https://doi.org/10.1007/s11207-016-1041-8

As the observational signature of the footprints of solar magnetic field lines open into the heliosphere, coronal holes provide a critical measure of the structure and evolution of these lines. Using a combination of Solar and Heliospheric Observator... Read More about Coronal Holes and Open Magnetic Flux over Cycles 23 and 24.

A Bound on the Pseudospectrum for a Class of Non-normal Schrödinger Operators (2016)
Journal Article
Dondl, P., Dorey, P., & Rossler, F. (2017). A Bound on the Pseudospectrum for a Class of Non-normal Schrödinger Operators. Applied mathematics research express, 2017(2), 271-296. https://doi.org/10.1093/amrx/abw011

We are concerned with the non-normal Schrödinger operator H=−Δ+VH=−Δ+V on L2(Rn)L2(Rn) , where V∈W1,∞loc(Rn)V∈Wloc1,∞(Rn) and ReV(x)≥c∣x∣2−dReV(x)≥c∣x∣2−d for some c,d>0c,d>0 . The spectrum of this operator is discrete and its real part is bounded be... Read More about A Bound on the Pseudospectrum for a Class of Non-normal Schrödinger Operators.

6d dual conformal symmetry and minimal volumes in AdS (2016)
Journal Article
Bhattacharya, J., & Lipstein, A. E. (2016). 6d dual conformal symmetry and minimal volumes in AdS. Journal of High Energy Physics, 2016(12), Article 105. https://doi.org/10.1007/jhep12%282016%29105

The S-matrix of a theory often exhibits symmetries which are not manifest from the viewpoint of its Lagrangian. For instance, powerful constraints on scattering amplitudes are imposed by the dual conformal symmetry of planar 4d N=4N=4 super Yang-Mill... Read More about 6d dual conformal symmetry and minimal volumes in AdS.

Constraints on galaxy formation models from the galaxy stellar mass function and its evolution (2016)
Journal Article
Rodrigues, L. F. S., Vernon, I., & Bower, R. G. (2017). Constraints on galaxy formation models from the galaxy stellar mass function and its evolution. Monthly Notices of the Royal Astronomical Society, 466(2), 2418-2435. https://doi.org/10.1093/mnras/stw3269

We explore the parameter space of the semi-analytic galaxy formation model GALFORM, studying the constraints imposed by measurements of the galaxy stellar mass function (GSMF) and its evolution. We use the Bayesian emulator method to quickly eliminat... Read More about Constraints on galaxy formation models from the galaxy stellar mass function and its evolution.

Optimisation of maintenance policy under parameter uncertainty using portfolio theory (2016)
Journal Article
Wu, S., Coolen, F., & Liu, B. (2017). Optimisation of maintenance policy under parameter uncertainty using portfolio theory. IISE Transactions, 49(7), 711-721. https://doi.org/10.1080/24725854.2016.1267881

In reliability mathematics, optimisation of maintenance policy is derived based on reliability indexes such as the reliability or its derivatives (e.g., the cumulative failure intensity or the renewal function) and the associated cost information. Th... Read More about Optimisation of maintenance policy under parameter uncertainty using portfolio theory.

Sectional curvature of polygonal complexes with planar substructures (2016)
Journal Article
Keller, M., Peyerimhoff, N., & Pogorzelski, F. (2017). Sectional curvature of polygonal complexes with planar substructures. Advances in Mathematics, 307, 1070-1107. https://doi.org/10.1016/j.aim.2016.10.027

In this paper we introduce a class of polygonal complexes for which we consider a notion of sectional combinatorial curvature. These complexes can be viewed as generalizations of 2-dimensional Euclidean and hyperbolic buildings. We focus on the case... Read More about Sectional curvature of polygonal complexes with planar substructures.