Publications (39)
Electrified Fuzzy Spheres and Funnels in Curved Backgrounds
Steven Thomas, John Ward
We use the non-Abelian DBI action to study the dynamics of coincident -branes in an arbitrary curved background, with the presence of a homogenous world-volume electric fie…
The Subleading Eikonal in Supergravity Theories
Arnau Koemans Collado, Paolo Di Vecchia, Rodolfo Russo +1
In this paper we study the subleading contributions to eikonal scattering in (super)gravity theories with particular emphasis on the role of both elastic and inelastic scattering p…
Direct Mediation and Metastable Supersymmetry Breaking for SO(10)
Daniel Koschade, Moritz McGarrie, Steven Thomas
We examine a metastable Macroscopic SO(N) SQCD model of Intriligator, Seiberg and Shih (ISS). We introduce various baryon and meson deformations, including multitra…
Orbifold Duality Symmetries and Quantum Hall systems
Spyros Skoulakis, Steven Thomas
We consider the possible role that chiral orbifold conformal field theories may play in describing the edge state theories of quantum Hall systems. This is a generalization of work…
Dirac-Born-Infeld actions and Tachyon Monopoles
Vincenzo Calò, Gianni Tallarita, Steven Thomas
We investigate magnetic monopole solutions of the non-abelian DBI action describing 2 coincident non-BPS D9-branes in flat space. Just as in the case of kink and vortex solitonic t…
String Necklaces and Primordial Black Holes from Type IIB Strings
Matthew Lake, Steven Thomas, John Ward
We consider a model of static cosmic string loops in type IIB string theory, where the strings wrap cycles within the internal space. The strings are not topologically stabilised,…
Domain walls in five dimensional supergravity with non-trivial hypermultiplets
Klaus Behrndt, Carl Herrmann, Jan Louis +1
We study BPS domain wall solutions of 5-dimensional N=2 supergravity where isometries of the hypermultiplet geometry have been gauged. We derive the corresponding supersymmetric fl…
Duality Invariant Magnetohydrodynamics And Dyons
Omduth Coceal, Wafic A. Sabra, Steven Thomas
The theory of magnetohydrodynamics is extended to the cases of a plasma of separate magnetic and electric charges, as well as to a plasma of dyons respectively. In both these cases…
Geometrical Tachyon Kinks and NS5 Branes
Steven Thomas, John Ward
We further investigate the 5 ring background using the tachyon map. Mapping the radion fields to the rolling tachyon helps to explain the motion of a probe -brane in this b…
Inflation from Geometrical Tachyons
Steven Thomas, John Ward
We propose an alternative formulation of tachyon inflation using the geometrical tachyon arising from the time dependent motion of a BPS -brane in the background geometry due t…
Large Screening in Two Dimensional Nonabelian Vortex Systems
Chinorat Kobdaj, Steven Thomas
We study charge screening in a system of two dimensional nonabelian vortices, at finite temperature. Such vortices are generated after an \( SO(3) \) global symmetry group is spont…
Non Abelian Tachyon Kinks
Vincenzo Calò, Gianni Tallarita, Steven Thomas
Starting from the action of two coincident non-BPS D9-branes, we investigate kink configurations of the U(2) matrix tachyon field. We consider both Str and Tr prescriptions for the…
Scales of Gaugino Condensation and Supersymmetry Breaking in Nonstandard M-Theory Embeddings
Zygmunt Lalak, Steven Thomas
We investigate the formation of dynamical gaugino condensates and supersymmetry breaking in the compactifications of Horava-Witten theory with perturbative nonstandard embeddings.…
Near-Infrared Photometry of the Type IIn SN 2005ip: The Case for Dust Condensation
Ori Fox, Michael F. Skrutskie, Roger A. Chevalier +13
Near-infrared photometric observations of the Type IIn SN 2005ip in NGC 2906 reveal large fluxes (>1.3 mJy) in the K_s-band over more than 900 days. While warm dust can explain the…
The outer rings of SN 1987A from year 1994 to 2024: morphology, light curves, and optical to mid-infrared spectra
Sophie Rosu, Elko Gerville-Reache, Steven Thomas +14
The outer rings (ORs) of Supernova (SN) 1987A were ejected ~20000 years before the explosion. Their characterisation is crucial for constraining the properties of the progenitor of…
Gaugino Condensation, Moduli Potentials and Supersymmetry Breaking in M-Theory Models
Zygmunt Lalak, Steven Thomas
We derive the explicit form, and discuss some properties of the moduli dependent effective potential arising from M-theory compactified on , when one…
Beyond the Basics: Leveraging Large Language Model for Fine-Grained Medical Entity Recognition
Nwe Ni Win, Jim Basilakis, Steven Thomas +6
Extracting clinically relevant information from unstructured medical narratives such as admission notes, discharge summaries, and emergency case histories remains a challenge in cl…
Non-topological Cycloops
Matthew Lake, Steven Thomas, John Ward
We propose a mechanism for the creation of cosmic string loops with dynamically stabilised windings in the internal space. Assuming a velocity correlations regime in the post-infla…
Eikonal Scattering in Kaluza-Klein Gravity
Arnau Koemans Collado, Steven Thomas
We study eikonal scattering in the context of Kaluza-Klein theory by considering a massless scalar field coupled to Einstein's gravity in 5D compactified to 4D on a manifold $M_4\t…
Fuzzy Sphere Dynamics and Non-Abelian DBI in Curved Backgrounds
Steven Thomas, John Ward
We consider the non-Abelian action for the dynamics of -branes in the background of -branes, which parameterises a fuzzy sphere using the SU(2) algebra. We find that t…
Logarithmic Conformal Field Theory Solutions of Two Dimensional Magnetohydrodynamics
Spyros Skoulakis, Steven Thomas
We consider the application of logarithmic conformal field theory in finding solutions to the turbulent phases of 2-dimensional models of magnetohydrodynamics. These arise upon dim…
Perturbing Conformal Turbulence
Omduth Coceal, Steven Thomas
We consider perturbations of the non-unitary minimal model solutions of two-dimensional conformal turbulence proposed by Polyakov. Demanding the absence of non-integrable singulari…
OMOP ETL Framework for Semi-Structured Health Data
Jacob Desmond, Ryan Wartmann, Chng Wei Lau +3
Healthcare data are generated in many different formats, which makes it difficult to integrate and reuse across institutions and studies. Standardisation is required to enable cons…
Conformal Models of Magnetohydrodynamic Turbulence
Omduth Coceal, Steven Thomas
Following the previous work of Ferretti and Yang on the role of magnetic fields in the theory of conformal turbulence, we show that non-unitary minimal model solutions to 2-dimensi…
Classification of kinetic-related injury in hospital triage data using NLP
Midhun Shyam, Jim Basilakis, Kieran Luken +4
Triage notes, created at the start of a patient's hospital visit, contain a wealth of information that can help medical staff and researchers understand Emergency Department patien…
Phase Transitions in Separated and anti- Branes at Finite Temperature
Vincenzo Calò, Steven Thomas
We consider a pair of parallel and anti- branes in flat space, with a finite separation along some perpendicular spatial direction and at finite…
Beyond the Standard Embedding in M-Theory on S^1/Z_2
Zygmunt Lalak, Stefan Pokorski, Steven Thomas
In this paper we discuss compactifications of M-theory to four dimensions on X \times S^1/Z_2, in which nonstandard embeddings in the E_8 \times E_8 vacuum gauge bundle are conside…
D-Brane Dynamics and NS5 Rings
Steven Thomas, John Ward
We consider the classical motion of a probe D-brane moving in the background geometry of a ring of NS5 branes, assuming that the latter are non-dynamical. We analyse the solutions…
Metastable SUSY Breaking and Supergravity at Finite Temperature
Lilia Anguelova, Riccardo Ricci, Steven Thomas
We study how coupling to supergravity affects the phase structure of a system exhibiting dynamical supersymmetry breaking in a metastable vacuum. More precisely, we consider the Se…
Non Abelian Geometrical Tachyon
Vincenzo Calo, Gianni Tallarita, Steven Thomas
We investigate the dynamics of a pair of coincident D5 branes in the background of NS5 branes. It has been proposed by Kutasov that the system with a single probing D-brane mov…
Generating the cosmic microwave background power asymmetry with
Zachary Kenton, David J. Mulryne, Steven Thomas
We consider a higher order term in the expansion for the CMB power asymmetry generated by a superhorizon isocurvature field fluctuation. The term can generate the asymmetry w…
D-brane dynamics near compactified NS5-branes
Steven Thomas, John Ward
We examine the dynamics of a -brane in the background of coincident, parallel 5-branes which have had one of their common transverse directions compactified. We find th…
Finite Soft Terms in String Compactifications with Broken Supersymmetry
Imran Shah, Steven Thomas
We consider the role of supersymmetry breaking soft terms that are present in generalized Narain compactifications of heterotic string theory, in which local supersymmetry is spont…
Maxwell-Chern-Simons Vortices and Holographic Superconductors
Gianni Tallarita, Steven Thomas
We investigate probe limit vortex solutions of a charged scalar field in Einstein-Maxwell theory in 3+1 dimensions, for an asymptotically AdS Schwarzschild black hole metric with t…
Non-Abelian (p,q) Strings in the Warped Deformed Conifold
Steven Thomas, John Ward
We calculate the tension of -strings in the warped deformed conifold using the non-Abelian DBI action. In the large flux limit, we find exact agreement with the recent expre…
D-brane Potentials in the Warped Resolved Conifold and Natural Inflation
Zachary Kenton, Steven Thomas
In this paper we obtain a model of Natural Inflation from string theory with a Planckian decay constant. We investigate D-brane dynamics in the background of the warped resolved co…
The Quantum Education Ecosystem: A Review of Global Initiatives, Methods, and Challenges
Sara Ayman Metwalli, Aryan Iliat, Steven Thomas +3
Quantum information science and engineering (QISE) is advancing rapidly, creating an urgent demand for a quantum-literate, technically proficient workforce. Despite this need, quan…
Gravitational Wave Constraints on Multi-Brane Inflation
Ian Huston, James E. Lidsey, Steven Thomas +1
A class of non-canonical inflationary models is identified, where the leading-order contribution to the non-Gaussianity of the curvature perturbation is determined by the sound spe…
Supergravity and Supersymmetry Breaking in Four and Five Dimensions
John Ellis, Zygmunt Lalak, Stefan Pokorski +1
We discuss supersymmetry breaking in the field-theoretical limit of the strongly-coupled heterotic string compactified on a Calabi-Yau manifold, from the different perspectives of…