Skip to main content

Research Repository

Advanced Search

All Outputs (148)

Boundary conditions for scalars in Lifshitz (2013)
Journal Article
Andrade, T., & Ross, S. F. (2013). Boundary conditions for scalars in Lifshitz. Classical and Quantum Gravity, 30(6), Article 065009. https://doi.org/10.1088/0264-9381/30/6/065009

We consider the quantization of scalar fields on a Lifshitz background, exploring the possibility of alternative boundary conditions, allowing the slow falloff mode to fluctuate. We show that the scalar field with alternative boundary conditions is n... Read More about Boundary conditions for scalars in Lifshitz.

On the connection between probability boxes and possibility measures (2013)
Journal Article
Troffaes, M. C., Miranda, E., & Destercke, S. (2013). On the connection between probability boxes and possibility measures. Information Sciences, 224, 88-108. https://doi.org/10.1016/j.ins.2012.09.033

We explore the relationship between possibility measures (supremum preserving normed measures) and p-boxes (pairs of cumulative distribution functions) on totally preordered spaces, extending earlier work in this direction by De Cooman and Aeyels, am... Read More about On the connection between probability boxes and possibility measures.

Reversible complex hyperbolic isometries (2013)
Journal Article
Gongopadhyay, K., & Parker, J. R. (2013). Reversible complex hyperbolic isometries. Linear Algebra and its Applications, 438(6), 2728-2739. https://doi.org/10.1016/j.laa.2012.11.029

Let PU(n,1) denote the isometry group of the n-dimensional complex hyperbolic space hn. An isometry g is called reversible if g is conjugate to g-1 in PU(n,1). If g can be expressed as a product of two involutions, it is called strongly reversible. W... Read More about Reversible complex hyperbolic isometries.

Non-dissipative hydrodynamics: Effective actions versus entropy current (2013)
Journal Article
Bhattacharya, J., Bhattacharyya, S., & Rangamani, M. (2013). Non-dissipative hydrodynamics: Effective actions versus entropy current. Journal of High Energy Physics, 2013(2), Article 153. https://doi.org/10.1007/jhep02%282013%29153

While conventional hydrodynamics incorporating dissipative effects is hard to derive from an action principle, it is nevertheless possible to construct classical actions when the dissipative terms are switched off. In this note we undertake a systema... Read More about Non-dissipative hydrodynamics: Effective actions versus entropy current.

The low energy dynamics of charge two dyonic instantons (2013)
Journal Article
Allen, J., & Smith, D. (2013). The low energy dynamics of charge two dyonic instantons. Journal of High Energy Physics, 2013(2), Article 113. https://doi.org/10.1007/jhep02%282013%29113

We explore the low energy dynamics of charge two instantons and dyonic instantons in SU(2) 5-dimensional Yang-Mills. We make use of the moduli space approximation and first calculate the moduli space metric for two instantons. For dyonic instantons t... Read More about The low energy dynamics of charge two dyonic instantons.

A number-of-modes reference rule for density estimation under multimodality (2013)
Journal Article
Einbeck, J., & Taylor, J. (2013). A number-of-modes reference rule for density estimation under multimodality. Statistica Neerlandica, 67(1), 54-66. https://doi.org/10.1111/j.1467-9574.2012.00531.x

We consider kernel density estimation for univariate distributions. The question of interest is as follows: given that the data analyst has some background knowledge on the modality of the data (for instance, ‘data of this type are usually bimodal’),... Read More about A number-of-modes reference rule for density estimation under multimodality.

Super-Gaussian transport theory and the field-generating thermal instability in laser-plasmas (2013)
Journal Article
Bissell, J., Ridgers, C., & Kingham, R. (2013). Super-Gaussian transport theory and the field-generating thermal instability in laser-plasmas. New Journal of Physics, 15(2), Article 025017. https://doi.org/10.1088/1367-2630/15/2/025017

Inverse bremsstrahlung (IB) heating is known to distort the electron distribution function in laser–plasmas from a Gaussian towards a super-Gaussian, thereby modifying the equations of classical transport theory (Ridgers et al 2008 Phys. Plasmas 15 0... Read More about Super-Gaussian transport theory and the field-generating thermal instability in laser-plasmas.

Assessing Model Adequacy (2013)
Book Chapter
Goldstein, M., Seheult, A., & Vernon, I. (2013). Assessing Model Adequacy. In M. Mulligan, & J. Wainwright (Eds.), Environmental modelling : finding simplicity in complexity (435-449). (2). Wiley. https://doi.org/10.1002/9781118351475.ch26

Environmental models are simplified representations of complex physical systems. The implementation of any such model, as a computer simulator, involves further simplifications and approximations. The value of the resulting simulator, in giving scien... Read More about Assessing Model Adequacy.

Amplitudes of 3d Yang Mills Theory (2013)
Journal Article
Lipstein, A. E., & Mason, L. (2013). Amplitudes of 3d Yang Mills Theory. Journal of High Energy Physics, 2013(01), Article 009. https://doi.org/10.1007/jhep01%282013%29009

This paper studies various properties of amplitudes in 3d super Yang Mills theory. First we explain how to obtain the amplitudes of 3d super Yang Mills theories from 4d super Yang Mills theories and obtain their helicity structure. Next, we use a 3d... Read More about Amplitudes of 3d Yang Mills Theory.

The Quantum sl(N) Graph Invariant and a Moduli Space (2013)
Journal Article
Lobb, A., & Zentner, R. (2013). The Quantum sl(N) Graph Invariant and a Moduli Space. International Mathematics Research Notices, Advance Access, https://doi.org/10.1093/imrn/rns275

We associate a moduli problem to a colored trivalent graph; such graphs, when planar, appear in the state-sum description of the quantum sl(N) knot polynomial due to Murakami, Ohtsuki, and Yamada. We discuss how the resulting moduli space can be thou... Read More about The Quantum sl(N) Graph Invariant and a Moduli Space.

Instability of N=2 gauge theory in compact space with an isospin chemical potential (2013)
Journal Article
Chunlen, S., Peeters, K., Vanichchapongjaroen, P., & Zamaklar, M. (2013). Instability of N=2 gauge theory in compact space with an isospin chemical potential. Journal of High Energy Physics, 2013(1), Article 35. https://doi.org/10.1007/jhep01%282013%29035

We investigate N=2 super-Yang-Mills theory on a three sphere in the presence of an isospin chemical potential at strong coupling using the AdS/CFT correspondence. This system exhibits an instability for sufficiently large values of the chemical poten... Read More about Instability of N=2 gauge theory in compact space with an isospin chemical potential.

Inferring marketing channel relevance in the customer journey to online purchase (2013)
Preprint / Working Paper
Wooff, D., & Anderson, J. (2013). Inferring marketing channel relevance in the customer journey to online purchase

In this paper we address the problem of inferring marketing channel importance for the customer journey to online purchase, using sequential data analysis ideas. We suggest a method for inferring the relative value of channels using historical data.... Read More about Inferring marketing channel relevance in the customer journey to online purchase.

Time-weighted attribution of revenue to multiple e-commerce marketing channels in the customer journey (2013)
Preprint / Working Paper
Wooff, D., & Anderson, J. (2013). Time-weighted attribution of revenue to multiple e-commerce marketing channels in the customer journey

In this paper we address statistical issues in attributing revenue to marketing channels. We describe the relevant data structures and introduce an example. We suggest an asymmetric bathtub shape as appropriate for time-weighted revenue attribution t... Read More about Time-weighted attribution of revenue to multiple e-commerce marketing channels in the customer journey.

An Introduction to Localisation and Supersymmetry in Curved Space (2013)
Journal Article
Cremonesi, S. (2013). An Introduction to Localisation and Supersymmetry in Curved Space. Proceedings of Science, Modave2013,

This paper presents the lecture notes of a course that I taught at the Ninth Modave Summer School in Mathematical Physics. The course has been designed to give an introduction to new exact results for supersymmetric field theories obtained by localis... Read More about An Introduction to Localisation and Supersymmetry in Curved Space.

Islamic Insurance (Takaful): Demand and Supply in the UK (2013)
Journal Article
Coolen-Maturi, T. (2013). Islamic Insurance (Takaful): Demand and Supply in the UK. International Journal of Islamic and Middle Eastern Finance and Management, 6(2), 87-104. https://doi.org/10.1108/17538391311329806

Purpose: – This paper aims to examine empirically whether there is a real demand for takaful products among Muslims in the UK, and to assess the awareness about takaful insurance and its main principles among UK Muslim communities. Design/methodology... Read More about Islamic Insurance (Takaful): Demand and Supply in the UK.

Pathways of Large-scale Magnetic Couplings Between Solar Coronal Events (2013)
Journal Article
Schrijver, C., Title, A., Yeates, A., & DeRosa, M. (2013). Pathways of Large-scale Magnetic Couplings Between Solar Coronal Events. Astrophysical Journal, 773(2), https://doi.org/10.1088/0004-637x/773/2/93

The high-cadence, comprehensive view of the solar corona by SDO/AIA shows many events that are widely separated in space while occurring close together in time. In some cases, sets of coronal events are evidently causally related, while in many other... Read More about Pathways of Large-scale Magnetic Couplings Between Solar Coronal Events.

Homology of moduli spaces of linkages in high-dimensional Euclidean space (2013)
Journal Article
Schuetz, D. (2013). Homology of moduli spaces of linkages in high-dimensional Euclidean space. Algebraic & geometric topology, 13(2), 1183-1224. https://doi.org/10.2140/agt.2013.13.1183

We study the topology of moduli spaces of closed linkages in ℝd depending on a length vector ℓ ∈ ℝn. In particular, we use equivariant Morse theory to obtain information on the homology groups of these spaces, which works best for odd d. In the case... Read More about Homology of moduli spaces of linkages in high-dimensional Euclidean space.

Unique topological characterization of braided magnetic fields (2013)
Journal Article
Yeates, A., & Hornig, G. (2013). Unique topological characterization of braided magnetic fields. Physics of Plasmas, 20(1), Article 012102. https://doi.org/10.1063/1.4773903

We introduce a topological flux function to quantify the topology of magnetic braids: non-zero, line-tied magnetic fields whose field lines all connect between two boundaries. This scalar function is an ideal invariant defined on a cross-section of t... Read More about Unique topological characterization of braided magnetic fields.