Research works

Hamiltonian formulation of Carrollian Maxwell theory in deformed light-cone Kaluza-Klein-like null reduction

We construct magnetic and electric Carrollian Maxwell theories by performing Kaluza-Klein-like null reduction of a complex Maxwell field in a Bargmann deformed light-cone background with manifest gauge symmetry. The procedure preserves the original first-class U(1) Gauss constrai...

Direct large-area observation of subsurface plastic activity in conditioned copper electrodes

High-field conditioning is the process by which radio-frequency structures in particle accelerators and other high-gradient devices reach their operating fields, yet the underlying physical mechanism remains an open question. Models and indirect measurements point to subsurface d...

Edge-enhanced diffractive neural networks based on spin-multiplexed nonlocal metasurfaces

Single-layer diffractive neural networks often face classification accuracy bottlenecks due to limited wavefront modulation capabilities. Edge detection, as an optical image processing technique, extracts image contours and offers a promising way to simplify classification tasks....

Nonlinear pluggable optics: Digital signal processing-free Intensity Modulated Direct Detection links using analog photonic Next Generation Reservoir Computing

In this work, we propose a Nonlinear Pluggable Optic (NLPO) transceiver that combines the low latency and low power consumption of Linear Pluggable Optics (LPO) with the range and robustness of digital signal processing (DSP)-based transceivers. The proposed NLPO uses an analog p...

Searching for extra dimensions with gravitational waves: Dark-siren constraints from GWTC-4

Higher-dimensional theories of gravity predict that gravitational waves (GWs) can propagate into extra spatial dimensions, leading to modified amplitude damping over cosmological distances. Measurements of GW luminosity distances therefore provide a unique probe of the dimensiona...

Prescription Intervals of Medications for Chronic Use: A Cohort Study

ABSTRACT Purpose In deprescribing studies, a prescription-free gap is typically used to determine if patients discontinued their treatment. An appropriate gap depends on the typical time between prescriptions during continued use. This work aims to characterise the interval betwe...

Pathways to real composite operators from non-Hermitian fermions

A field theory in $3+1$ dimensions contains two fermions, two Abelian gauge fields, and one complex scalar, with dynamics fixed by a BRST symmetry. For a specific parameter configuration, the fermion mass matrix becomes non-Hermitian, and the propagators exhibit complex conjugate...

Odd-parity magnons in the Haldane-Hubbard model from topological exciton condensation

Odd-wave magnets are the counterparts to even-wave altermagnets realizing odd-parity spin splitting. Normally discussed for noncollinear systems, they have recently been shown to appear in collinear magnetic states in the presence of loop currents. Here we study collective excita...

Electronic primary thermometry: Experimental comparison of the Coulomb blockade and shot noise thermometer

Since the redefinition of the kelvin in 2019, new methods of primary thermometry have been considered to replace the currently agreed temperature scale in the very high and low temperature limits. These new methods should provide improved uncertainties and, most importantly, a mo...

Plasma conductivity from warm dense matter to the Spitzer limit using mean-force kinetic theory

A theoretical model is developed to compute electronic transport coefficients extending from warm and dense to hot and dilute plasma conditions. This kinetic theory-based approach models strong Coulomb correlations by treating interactions using the potential of mean force, elect...

Gravitational-wave astronomy with a space-based optical clock network

Since the first detection of a merging binary black hole system a decade ago, gravitational-wave astronomy has emerged as a powerful tool for astrophysics. Future space-based observatories, such as the Laser Interferometer Space Antenna (LISA), will unlock the millihertz (mHz) ba...

Critical states and anomalous wave transport in an aperiodic polariton monotile

Recently "the Hat" monotile was introduced into the family of aperiodic tilings and quasicrystals boasting physical properties lying at the boundary of ordered and disordered systems. Here we study the two-dimensional wave transport, transverse localization and scaling properties...

Using the pericentre precession of LAGEOS II to constrain quadratically coupled ultralight dark matter

It has been proposed that feebly interacting ultralight scalars may constitute the dark matter content of the universe. Models describing the interactions of a dark matter scalar with Standard Model fields may feature quadratic interactions at leading order, such that the scalar...

Fewer simulations, sharper covariances: Reducing mock covariance noise with Zel’dovich approximation control variates

We present a control-variate method for reducing the variance of power spectrum covariance matrix estimates from simulations of large-scale structure. The key idea is to pair each mock simulation with a cheap Zeldovich-approximation realization sharing the same initial conditions...

York-Tank: A Degradation-Aware and Difficulty-Stratified Stereo Dataset for Underwater Visual SLAM

Coupled visual degradations in underwater recordings make it difficult to relate simultaneous localization and mapping (SLAM) performance changes to specific factors and their severity. We present York-Tank, which is a controlled stereo dataset combining dominant-factor sequence...

Reflect-Guard: Enhancing LLM Safeguards Against Adversarial Prompts via Logical Self-Reflection

LLM safety classifiers such as Llama Guard detect overtly harmful prompts well but remain vulnerable to jailbreaks that disguise intent via role-play, fictional framing, or indirect requests. We present Reflect-Guard: Llama-Guard-3-8B fine-tuned via QLoRA to generate a distilled,...

Application of LHC gas recuperation systems for methane emission control in livestock housing

Abstract The CH4rLiE (CH4 Livestock Emission) project presents a dry-gas laboratory proof-of-principle for mitigating methane (CH4) emissions in livestock housing. This work investigates the technical feasibility of capturing CH4 at low concentrations by adapting gas recovery sys...

An empirical investigation of the pathways model of problem gambling and the UPPS-P

Abstract While impulsivity is recognised as a central aetiological factor of problem gambling within the pathways model, limited research has examined the different dimensions of this trait and the three gambling sub-types contained within this model. Thus, the current study aime...

XFlowMap: cross-scale generalization and mapping of massive origin-destination data

Mapping large origin-destination (OD) datasets remains challenging because flow maps become cluttered, meaningful patterns occur at multiple spatial scales, and existing flow-mapping approaches frequently rely on predefined aggregation units or manual generalization. This paper p...

A 4200-hour HyperFlash and ÉCLAT campaign on the hyperactive FRB 20240114A: constraining energetics with the most brilliant bursts

Abstract Hyperactive repeaters provide a unique window into the evolving environments and energy budgets of fast radio burst (FRB) sources, though they may not be representative of the FRB population in general. High-cadence observations are key to capturing the rarest and most e...