A5003777616- 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
- Quantum many-body systems
- Topological and Geometric Data Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Quantum chaos and dynamical systems
- Markov Chains and Monte Carlo Methods
- Stochastic processes and statistical mechanics
- Neural Networks and Applications
- Quantum, superfluid, helium dynamics
- Noncommutative and Quantum Gravity Theories
- Advanced Neuroimaging Techniques and Applications
- Computational Physics and Python Applications
- Advanced Thermodynamics and Statistical Mechanics
- COVID-19 epidemiological studies
- Quantum and electron transport phenomena
- Machine Learning in Materials Science
- Dark Matter and Cosmic Phenomena
Swansea University
2016-2025
University of Plymouth
2012-2023
National Yang Ming Chiao Tung University
2022-2023
University of Edinburgh
2011-2023
Pusan National University
2022-2023
Institute for Basic Science
2023
Brookhaven National Laboratory
2008-2023
Chung Yuan Christian University
2022-2023
University of Bonn
2023
Foundry (United Kingdom)
2019-2021
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...
A bstract The Sp(4) gauge theory with two Dirac fundamental flavours provides a candidate for the microscopic origin of composite-Higgs models based on SU(4)/Sp(4) coset. We employ combination different, complementary strategies numerical lattice calculations, Hybrid Monte Carlo and Heat Bath algorithms. perform pure Yang-Mills, quenched computations exploratory studies dynamical Wilson fermions. present first results in literature spectrum glueballs Yang-Mills theory, an EFT framework...
We provide the first determination of mass lightest flavor-singlet pseudoscalar and scalar bound states (mesons) in Sp(4) Yang-Mills theory coupled to two flavors fundamental fermions, using lattice methods. This has applications both composite Higgs strongly interacting dark matter scenarios. find singlets have masses comparable those light flavored states, which might important implications for phenomenological models. focus on regions parameter space corresponding a moderately heavy...
We demonstrate that the update of weight matrices in learning algorithms can be described framework Dyson Brownian motion, thereby inheriting many features random matrix theory. relate level stochasticity to ratio rate and minibatch size, providing more robust evidence a previously conjectured scaling relationship. discuss universal nonuniversal resulting Coulomb gas distribution identify Wigner surmise semicircle explicitly teacher-student model (near-)solvable case Gaussian restricted...
We calculate the string tensions of $k$-strings in SU($N$) gauge theories both 3 and 4 dimensions. In D=3+1, we find that ratio $k=2$ tension to $k = 1$ fundamental is consistent, at $2 \sigma$ level, with M(-theory)QCD-inspired conjecture `Casimir scaling'. D=2+1 see a definite deviation from MQCD formula, as well much smaller but still significant Casimir scaling. D=3+1 high temperature spatial $k$-string also satisfy approximate point out scaling arises naturally if cross-section flux...
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.
In order to calculate QED corrections hadronic physical quantities by means of lattice simulations, a coherent description electrically-charged states in finite volume is needed. the usual periodic setup, Gauss's law and large gauge transformations forbid propagation states. A possible solution this problem, which does not violate axioms local quantum field theory, has been proposed Wiese Polley, based on use C⋆ boundary conditions. We present thorough analysis properties symmetries...
Introduction The emergence of the novel respiratory SARS-CoV-2 and subsequent COVID-19 pandemic have required rapid assimilation population-level data to understand control spread infection in general vulnerable populations. Rapid analyses are needed inform policy development target interventions at-risk groups prevent serious health outcomes. We aim provide an accessible research platform determine demographic, socioeconomic clinical risk factors for infection, morbidity mortality COVID-19,...
We perform lattice studies of meson mass spectra and decay constants the $Sp(4)$ gauge theory in quenched approximation. consider two species (Dirac) fermions as matter field content, transforming 2-index antisymmetric fundamental representation group, respectively. All fields are formulated Wilson fermions. extrapolate to continuum massless limits compare each other results obtained for mesons. In case three fermions, long-distance dynamics is relevant composite Higgs models. This first...
In commonly used Monte Carlo algorithms for lattice gauge theories the integrated autocorrelation time of topological charge is known to be exponentially-growing as continuum limit approached. This $\mathit{topological}\,\,\textit{freezing}$, whose severity increases with size group, can result in potentially large systematics. To provide a direct quantification latter, we focus on $\mathrm{SU}(6)$ Yang--Mills theory at spacing which conventional methods associated decorrelation have an...
Restricted Boltzmann machines (RBMs) are well-known tools used in machine learning to learn probability distribution functions from data. We analyze RBMs with scalar fields on the nodes perspective of lattice field theory. Starting simplest case Gaussian fields, we show that RBM acts as an ultraviolet regulator, cutoff determined by either number hidden or a model mass parameter. verify these ideas case, where target is known, and explore implications for cases it not known using MNIST...
We report the results of lattice numerical studies <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>S</a:mi><a:mi>p</a:mi><a:mo stretchy="false">(</a:mo><a:mn>4</a:mn><a:mo stretchy="false">)</a:mo></a:mrow></a:math> gauge theory coupled to fermions (hyperquarks) transforming in fundamental and two-index antisymmetric representations group. This strongly is minimal candidate for ultraviolet completion composite Higgs models that facilitate mechanism partial...
We study the dual superconductivity of ground state SU(2) gauge theory in connection with confinement. do this measuring on lattice a disorder parameter describing condensation monopoles. Confinement appears as transition to superconductor, independent Abelian projection defining Some speculation is made existence more appropriate parameter. A similar for SU(3) presented companion paper.
Diquarks may play an important role in hadron spectroscopy, baryon decays, and color superconductivity. We investigate the existence of diquark correlations lattice QCD by considering systematically all lowest energy channels a gauge-invariant setup. measure mass differences between various show that positive parity scalar is lightest. Quark-quark inside are clearly seen this channel, yield size O(1) fm.
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 $T_c$...