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Novel metals and insulators from holography (2014)
Journal Article
Donos, A., & Gauntlett, J. P. (2014). Novel metals and insulators from holography. Journal of High Energy Physics, 2014(6), https://doi.org/10.1007/jhep06%282014%29007

Using simple holographic models in D = 4 spacetime dimensions we construct black hole solutions dual to d = 3 CFTs at finite charge density with a Q-lattice deformation. At zero temperature we find new ground state solutions, associated with broken t... Read More about Novel metals and insulators from holography.

Bethe ansatz for Yangian invariants: Towards super Yang–Mills scattering amplitudes (2014)
Journal Article
Frassek, R., Kanning, N., Ko, Y., & Staudacher, M. (2014). Bethe ansatz for Yangian invariants: Towards super Yang–Mills scattering amplitudes. Nuclear Physics B, 883, 373-424. https://doi.org/10.1016/j.nuclphysb.2014.03.015

We propose that Baxter's Z -invariant six-vertex model at the rational gl(2) point on a planar but in general not rectangular lattice provides a way to study Yangian invariants. These are identified with eigenfunctions of certain monodromies of an au... Read More about Bethe ansatz for Yangian invariants: Towards super Yang–Mills scattering amplitudes.

Growth of cross-characteristic representations of finite quasisimple groups of Lie type (2014)
Journal Article
Häsä, J. (2014). Growth of cross-characteristic representations of finite quasisimple groups of Lie type. Journal of Algebra, 407, 275-306. https://doi.org/10.1016/j.jalgebra.2014.02.031

In this paper we give a bound to the number of conjugacy classes of maximal subgroups of any almost simple group whose socle is a classical group of Lie type. The bound is View the MathML source, where n is the dimension of the classical socle and q... Read More about Growth of cross-characteristic representations of finite quasisimple groups of Lie type.

Time-weighted multi-touch attribution and channel relevance in the customer journey to online purchase (2014)
Journal Article
Wooff, D., & Anderson, J. (2015). Time-weighted multi-touch attribution and channel relevance in the customer journey to online purchase. Journal of statistical theory and practice, 9(2), 227-249. https://doi.org/10.1080/15598608.2013.862753

We address statistical issues in attributing revenue to marketing channels and inferring the importance of individual channels in customer journeys towards an online purchase. We describe the relevant data structures and introduce an example. We sugg... Read More about Time-weighted multi-touch attribution and channel relevance in the customer journey to online purchase.

A simple holographic model of momentum relaxation (2014)
Journal Article
Andrade, T., & Withers, B. (2014). A simple holographic model of momentum relaxation. Journal of High Energy Physics, 2014(5), Article 101. https://doi.org/10.1007/jhep05%282014%29101

We consider a holographic model consisting of Einstein-Maxwell theory in d + 1 bulk spacetime dimensions with d − 1 massless scalar fields. Momentum relaxation is realised simply through spatially dependent sources for operators dual to the neutral s... Read More about A simple holographic model of momentum relaxation.

Use of Emulator Methodology for Uncertainty Reduction Quantification (2014)
Presentation / Conference Contribution
Ferreira, C., Vernon, I., Schiozer, D., & Goldstein, M. (2014). Use of Emulator Methodology for Uncertainty Reduction Quantification. In LACPEC 14: SPE Latin American and Caribbean Petroleum Engineering Conference, proceedings, 21-23 May 2014, Maracaibo, Venezuela. https://doi.org/10.2118/169405-ms

In petroleum engineering, simulation models are used in the reservoir performance prediction and in the decision making process. These models are complex systems, typically characterized by a vast number of input parameters. Usually the physical stat... Read More about Use of Emulator Methodology for Uncertainty Reduction Quantification.

Non-homogeneous random walks on a semi-infinite strip (2014)
Journal Article
Georgiou, N., & Wade, A. R. (2014). Non-homogeneous random walks on a semi-infinite strip. Stochastic Processes and their Applications, 124(10), 3179-3205. https://doi.org/10.1016/j.spa.2014.05.005

We study the asymptotic behaviour of Markov chains (Xn,ηn) on Z+×S, where Z+ is the non-negative integers and S is a finite set. Neither coordinate is assumed to be Markov. We assume a moments bound on the jumps of Xn, and that, roughly speaking, ηn... Read More about Non-homogeneous random walks on a semi-infinite strip.

Observations of a hybrid double-streamer/pseudostreamer in the solar corona (2014)
Journal Article
Rachmeler, L., Platten, S., Bethge, C., Seaton, D., & Yeates, A. (2014). Observations of a hybrid double-streamer/pseudostreamer in the solar corona. Astrophysical Journal Letters, 787(1), https://doi.org/10.1088/2041-8205/787/1/l3

We report on the first observation of a single hybrid magnetic structure that contains both a pseudostreamer and a double streamer. This structure was originally observed by the SWAP instrument on board the PROBA2 satellite between 2013 May 5 and 10.... Read More about Observations of a hybrid double-streamer/pseudostreamer in the solar corona.

Nonparametric predictive inference for system reliability using the survival signature (2014)
Journal Article
Coolen, F., Coolen-Maturi, T., & Al-nefaiee, A. (2014). Nonparametric predictive inference for system reliability using the survival signature. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 228(5), 437-448. https://doi.org/10.1177/1748006x14526390

The survival signature has recently been presented as an attractive concept to aid quantification of system reliability. It has similar characteristics as the system signature, which is well established, but contrary to the latter it is easily applic... Read More about Nonparametric predictive inference for system reliability using the survival signature.

Folding defect affine Toda field theories (2014)
Journal Article
Robertson, C. (2014). Folding defect affine Toda field theories. Journal of Physics A: Mathematical and Theoretical, 47(18), Article 185201. https://doi.org/10.1088/1751-8113/47/18/185201

A folding process is applied to fused a(1) r defects to construct defects for the non-simply laced affine Toda field theories of c(1) n , d(2) n and a(2) 2n at the classical level. Support for the hypothesis that these defects are integrable in the f... Read More about Folding defect affine Toda field theories.

Reflection subgroups of odd-angled Coxeter groups (2014)
Journal Article
Felikson, A., Fintzen, J., & Tumarkin, P. (2014). Reflection subgroups of odd-angled Coxeter groups. Journal of Combinatorial Theory, Series A, 126, 92-127. https://doi.org/10.1016/j.jcta.2014.04.008

We give a criterion for a finitely generated odd-angled Coxeter group to have a proper finite index subgroup generated by reflections. The answer is given in terms of the least prime divisors of the exponents of the Coxeter relations.

On the helicity of open magnetic fields (2014)
Journal Article
Prior, C., & Yeates, A. (2014). On the helicity of open magnetic fields. Astrophysical Journal, 787(2), Article 100. https://doi.org/10.1088/0004-637x/787/2/100

We reconsider the topological interpretation of magnetic helicity for magnetic fields in open domains, and relate this to the relative helicity. Specifically, our domains stretch between two parallel planes, and each of these ends may be magnetically... Read More about On the helicity of open magnetic fields.

Supersymmetric Perturbations of the M5 brane (2014)
Journal Article
Niarchos, V. (2014). Supersymmetric Perturbations of the M5 brane. Journal of High Energy Physics, 2014(5), Article 023. https://doi.org/10.1007/jhep05%282014%29023

We study long-wavelength supersymmetric deformations of brane solutions in supergravity using an extension of previous ideas within the general scheme of the blackfold approach. As a concrete example, we consider long-wavelength perturbations of the... Read More about Supersymmetric Perturbations of the M5 brane.

The solar cycle variation of topological structures in the global solar corona (2014)
Journal Article
Platten, S., Parnell, C., Haynes, A., Priest, E., & Mackay, D. (2014). The solar cycle variation of topological structures in the global solar corona. Astronomy & Astrophysics, 565, Article A44. https://doi.org/10.1051/0004-6361/201323048

Context. The complicated distribution of magnetic flux across the solar photosphere results in a complex web of coronal magnetic field structures. To understand this complexity, the magnetic skeleton of the coronal field can be calculated. The skelet... Read More about The solar cycle variation of topological structures in the global solar corona.

Equilibrium Morphologies and Force Extension Behavior for Polymers with Hydrophobic Patches: Role of Quenched Disorder (2014)
Journal Article
Mishra, A., Panwar, A., & Chakrabarti, B. (2014). Equilibrium Morphologies and Force Extension Behavior for Polymers with Hydrophobic Patches: Role of Quenched Disorder. Macromolecular Theory and Simulations, 23(4), 266-278. https://doi.org/10.1002/mats.201300154

Equilibrium morphologies and mechanical properties of copolymers with hydrophobic segments are explored using Langevin dynamics simulations. The interplay between different length scales, namely, persistence length ℓp, and disorder correlation length... Read More about Equilibrium Morphologies and Force Extension Behavior for Polymers with Hydrophobic Patches: Role of Quenched Disorder.

Orbits for products of maps (2014)
Journal Article
Pakapongpun, A., & Ward, T. (2014). Orbits for products of maps. Thai Journal of Mathematics, 12(1), 33-44

We study the behaviour of the dynamical zeta function and the orbit Dirichlet series for products of maps. The behaviour under products of the radius of convergence for the zeta function, and the abscissa of convergence for the orbit Dirichlet series... Read More about Orbits for products of maps.

Bayesian inference for transportation origin-destination matrices: the Poisson-inverse Gaussian and other Poisson mixtures (2014)
Journal Article
Perrakis, K., Karlis, D., Cools, M., & Janssens, D. (2015). Bayesian inference for transportation origin-destination matrices: the Poisson-inverse Gaussian and other Poisson mixtures. Journal of the Royal Statistical Society: Series A, 178(1), 271-296. https://doi.org/10.1111/rssa.12057

Transportation origin–destination analysis is investigated through the use of Poisson mixtures by introducing covariate‐based models which incorporate different transport modelling phases and also allow for direct probabilistic inference on link traf... Read More about Bayesian inference for transportation origin-destination matrices: the Poisson-inverse Gaussian and other Poisson mixtures.