A5027702041- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- High-Energy Particle Collisions Research
- Theoretical and Computational Physics
- Physics of Superconductivity and Magnetism
- Explainable Artificial Intelligence (XAI)
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum many-body systems
- Adversarial Robustness in Machine Learning
- Multi-Agent Systems and Negotiation
- Topic Modeling
- Stochastic processes and statistical mechanics
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Semantic Web and Ontologies
- Computational Physics and Python Applications
- Quantum and electron transport phenomena
- Business Process Modeling and Analysis
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- Nuclear reactor physics and engineering
- Quantum Information and Cryptography
University of Plymouth
2015-2024
Trinity College Dublin
2022-2024
University of Southern Denmark
2011-2024
Imperial College London
2021-2024
Polytechnic University of Bari
2024
Center for Theoretical Biological Physics
2024
Massachusetts Institute of Technology
2024
Michigan State University
2022-2023
Goethe University Frankfurt
2022-2023
Lawrence Berkeley National Laboratory
2022-2023
We explore some consequences of the crossing symmetry for defect conformal field theories, focusing on codimension one defects like flat boundaries or interfaces. study surface transitions 3d Ising and other O(N) models through numerical solutions to equations with method determinants. In extraordinary transition, where low-lying spectrum operators is known, we use bootstrap obtain information bulk theory. ordinary transition knowledge allows calculate scale dimension relevant operator,...
The constraints of conformal bootstrap are applied to investigate a set field theories in various dimensions. prescriptions can be both unitary and non allowing for the study spectrum low-lying primary operators theory. We evaluate lowest scaling dimensions local associated with Yang-Lee edge singularity 2 ≤ D 6. Likewise we obtain six scalars four spinning 3d critical Ising model. Our findings agreement existing results per mill precision estimate several new exponents.
We study the gauge sector of Minimal Walking Technicolor, which is an SU(2) theory with nf=2 flavors Wilson fermions in adjoint representation. Numerical simulations are performed on lattices Nt x Ns^3, Ns ranging from 8 to 16 and Nt=2Ns, at fixed \beta=2.25, varying fermion bare mass m0, so that our numerical results cover full range masses quenched region chiral limit. present for string tension glueball spectrum. A comparison mesonic gluonic observables leads conclusion infrared dynamics...
The masses of the lowest-lying states in meson and gluonic sector an SU(2) gauge theory with two Dirac flavors adjoint representation are measured on lattice at a fixed value coupling $\beta = 4/g_0^2 2.25$ for values bare fermion mass $m_0$ that span range between quenched regime massless limit, various volumes. Even light constituent fermions lightest glueballs found to be lighter than mesons. Moreover, string tension static fundamental sources strongly depends dynamical becomes order...
The density of states is calculated for the SU(2), SU(3), and a compact U(1) lattice gauge theories using modified version Wang-Landau algorithm. We find that SU(2) theory can be reliably over range 120 000 orders magnitude sizes as big ${20}^{4}$. demonstrate potential algorithm by reproducing average action, its specific heat, critical couplings weak first order transition in U(1).
We investigate the structure and novel emerging features of mesonic nonsinglet spectrum minimal walking technicolor theory. Precision measurements in pseudoscalar vector channels are compared to expectations for an IR-conformal field theory a QCD-like Our results favor scenario which is (almost) conformal infrared, while spontaneous chiral symmetry breaking seems less plausible.
We consider the vacuum expectation value of Wilson loop operators by studying behavior string probes in solutions type-IIB theory generated ${N}_{c}$ $D5$-branes wrapped on an ${S}^{2}$ internal manifold. In particular, we focus to background equations that are dual field theories with a walking gauge coupling as well for flavored systems. present detail our solution and emphasize various general aspects procedure study loops using duals. discuss special features strings show when probing...
The deconfinement transition in SU($N_c$) Yang--Mills is investigated by Monte Carlo simulations of the gauge theory discretized on a spacetime lattice. We present new results for $ 4 \le N_c 8$ (in particular, $N_c = 5$ and 7$), which are analysed together with previously published results. increased amount data, improved statistics closer to continuum limit provide us better control over systematic errors. After performing thermodynamic limit, numerical ratio critical temperature $T_c$...
We present a numerical study of spectroscopic observables in the SU(2) gauge theory with two adjoint fermions using improved source and sink operators. compare detail our results previous determinations masses that used point sources sinks we investigate possible systematic effects both cases. Such comparison enables us to clearly assess impact short temporal extent on physical picture, some due finite spatial box. While confirming IR-conformal behavior theory, investigation shows order make...
The recent introduction of the gradient flow has provided a new tool to probe dynamics quantum field theories. latest developments have shown how use for exploration symmetries, and definition corresponding renormalized Noether currents. In this paper we introduce infinitesimal translations along gauge theories, study Ward identities. This approach is readily generalized case theories defined on lattice, where regulator breaks translation invariance. identities in lead nonperturbative...
In Wang–Landau type algorithms, Monte-Carlo updates are performed with respect to the density of states, which is iteratively refined during simulations. The partition function and thermodynamic observables then obtained by standard integration. this work, our recently introduced method in class (the LLR approach) analysed further developed. Our approach a histogram free particularly suited for systems continuous degrees freedom giving rise continuum as it commonly found lattice gauge...
A detailed investigation of finite-size effects is performed for SU(2) gauge theory with two fermions in the adjoint representation, which previous lattice studies have shown to be inside conformal window. The system investigated different spatial and temporal boundary conditions on lattices various extensions, values bare fermion mass representing a heavy light regime. Our study shows that infinite-volume limit masses decay constants mesonic sector reached only when pseudoscalar particle...
We present the first calculation of scattering amplitude in singlet channel beyond QCD. The is performed $SU(2)$ gauge theory with $N_f=2$ fundamental Dirac fermions and based on a finite-volume formalism. exhibits $SU(4) \to Sp(4)$ chiral symmetry breaking pattern that used to design minimal composite Higgs models currently tested at LHC. Our results show that, for range underlying fermion mass considered, lowest flavour state stable.
The use of counterfactual explanations (CFXs) is an increasingly popular explanation strategy for machine learning models. However, recent studies have shown that these may not be robust to changes in the underlying model (e.g., following retraining), which raises questions about their reliability real-world applications. Existing attempts towards solving this problem are heuristic, and robustness resulting CFXs evaluated with only a small number retrained models, failing provide exhaustive...
Neutral meson mixing and lifetimes are theory-side parametrised in terms four-quark operators which can be determined by calculating weak decay matrix elements using lattice Quantum Chromodynamics. While calculations of standard, determinations typically suffer from complications renormalisation procedures because dimension-6 mix with lower mass dimension and, moreover, quark-line disconnected diagrams contribute. We present work detailing the idea to use fermionic gradient flow...
Deep learning models are powerful image classifiers but their opacity hinders trustworthiness. Explanation methods for capturing the reasoning process within these faithfully and in a clear manner scarce, due to sheer complexity size. We provide solution this problem by defining novel method explaining outputs of with debates between two agents, each arguing particular class. obtain as concrete instances Free Argumentative eXchanges (FAXs), argumentation-based multi-agent framework allowing...
Abstract In lattice calculations, the approach to continuum limit is hindered by severe freezing of topological charge, which prevents ergodic sampling in configuration space. order significantly reduce autocorrelation time we develop a density states with smooth constraint and use it study SU(3) pure Yang Mills gauge theory near limit. Our algorithm relies on simulated tempering across range couplings, guarantees decorrelation charge sectors. Particular emphasis placed testing accuracy,...
Composite Higgs models are a class of proposed to address the hierarchy and naturalness problems associated with Standard Model fundamental scalar Higgs. $SU(2)$ two flavours is minimal model for composite sector which not yet ruled out by experimental data. We present lattice results mass degenerate flavours. For fermion action we use new exponential clover Wilson action, offers $O(a)$ improvement. discuss tuning $c_\mathrm{SW}$ parameter through Schrödinger functional simulations, scale...
Fermionic gradient flow in combination with the short-flow-time expansion provides a computational method where renormalisation of hadronic matrix elements on lattice can be simplified to address e.g.~the issue that operators different mass dimension mix. We demonstrate our procedure by determining four-quark describing neutral meson mixing or lifetimes. While calculations are well-established and serve validate procedure, calculation for heavy lifetimes is still outstanding. Preliminary...
Composite Higgs models are a class of Beyond the Standard Model (BSM) proposed to address hierarchy and naturalness problems associated with (SM) Higgs. A new QCD-like strongly interacting sector based on $SU(2)$ two fundamental flavours can be used build composite model which is not yet ruled out by experiment. The role singlet scalar resonance will affect phenomenology at LHC. In this project our goal understand properties state in isolation as first step understanding models. We present...