A5071943192- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Black Holes and Theoretical Physics
- Theoretical and Computational Physics
- Quantum and electron transport phenomena
- Graphene research and applications
- Data Visualization and Analytics
- Topological and Geometric Data Analysis
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Topological Materials and Phenomena
- Superconducting Materials and Applications
- Advanced Condensed Matter Physics
- Quantum chaos and dynamical systems
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Surface and Thin Film Phenomena
- Rare-earth and actinide compounds
- Data Management and Algorithms
- Advanced Thermodynamics and Statistical Mechanics
- Quantum Information and Cryptography
- Image Retrieval and Classification Techniques
Royal Hospital School
2024
University of Liverpool
2021-2024
Swansea University
2013-2022
University of Southern Denmark
2019-2022
Liverpool Hospital
2022
Fondazione Bruno Kessler
2022
National University of Ireland, Maynooth
2008-2020
Sejong University
2010-2020
Trinity College Dublin
2016-2020
Central China Normal University
2020
We propose a new method to investigate the thermal properties of QCD with small quark chemical potential $\ensuremath{\mu}.$ Derivatives and gluonic observables respect $\ensuremath{\mu}$ are computed at $\ensuremath{\mu}=0$ for two flavors $p4$ improved staggered fermions $ma=0.1,0.2$ on ${16}^{3}\ifmmode\times\else\texttimes\fi{}4$ lattice, used calculate leading order Taylor expansion in location pseudocritical point about $\ensuremath{\mu}=0.$ This should be well behaved values...
We present results of a simulation two flavor QCD on ${16}^{3}\ifmmode\times\else\texttimes\fi{}4$ lattice using p4-improved staggered fermions with bare quark mass $m/T=0.4$. Derivatives the thermodynamic grand canonical partition function $Z(V,T,{\ensuremath{\mu}}_{u},{\ensuremath{\mu}}_{d})$ respect to chemical potentials ${\ensuremath{\mu}}_{u,d}$ for different flavors are calculated up sixth order, enabling estimates pressure and number density as well chiral condensate various...
A lattice calculation is presented for the electrical conductivity σ of QCD plasma with 2+1 dynamical flavors at nonzero temperature. We employ conserved current on anisotropic lattices using a tadpole-improved clover action and study behavior over wide range temperatures, both below above deconfining transition. The extracted from spectral-function analysis maximal entropy method, discussion its systematics provided. find an increase σ/T across
The central idea of this review is to consider quantum field theory models relevant for particle physics and replace the fermionic matter in these by a bosonic one. This mostly motivated fact that bosons are more 'accessible' easier manipulate experimentalists, but 'substitution' also leads new novel phenomena. It allows us gain information about among other things confinement dynamics deconfinement transition. We will thus dynamical lattices corresponding Schwinger or [Formula: see text]...
We present results of a simulation QCD on 4x16^3 lattice with 2 continuum flavors p4-improved staggered fermion mass m/T=0.4. Derivatives the thermodynamic grand potential respect to quark chemical mu_q up fourth order are calculated, enabling estimates pressure, number density and associated susceptibilities as functions via Taylor series expansion. Discretisation effects various formulations discussed in some detail. In addition it is possible estimate radius convergence expansion function...
In lattice QCD, the maximum entropy method can be used to reconstruct spectral functions from Euclidean correlators obtained in numerical simulations. We show that at finite temperature most commonly algorithm, employing Bryan's method, is inherently unstable small energies and gives a modification avoids this. demonstrate this approach using vector current-current correlator quenched QCD temperature. Our first results indicate electrical conductivity above deconfinement transition.
We present a lattice QCD calculation of the charge diffusion coefficient, electrical conductivity and various susceptibilities conserved charges, for range temperatures below above deconfinement crossover. The calculations include contributions from up, down strange quarks. find that coefficient is order 1/(2\pi T) has dip around crossover temperature. Our results are obtained with simulations containing 2+1 dynamical flavours on anisotropic lattices. Maximum Entropy Method used to construct...
We study two-color QCD with two flavors of Wilson fermion as a function quark chemical potential mu and temperature T. find evidence superfluid phase at intermediate low T where the number density diquark condensate are both very well described by Fermi sphere nearly-free quarks disrupted BCS condensate. Our results suggest that contribution to energy is negative (and balanced positive gauge contribution), although this result highly sensitive details renormalisation. also chiral in region...
We have simulated two-color four-flavor QCD at nonzero chemical potential $\ensuremath{\mu}$ for quark number. Simulations were performed on ${8}^{4}$ and ${12}^{3}\ifmmode\times\else\texttimes\fi{}24$ lattices. Clear evidence was seen the formation of a colorless diquark condensate which breaks number spontaneously, $\ensuremath{\mu}>{\ensuremath{\mu}}_{c}\ensuremath{\sim}{m}_{\ensuremath{\pi}}/2.$ The transition appears to be second order. measured spectrum scalar pseudoscalar bosons shows...
We present the results of numerical simulations a $(2+1)$-dimensional fermion field theory based on recent proposal for model graphene consisting ${N}_{f}$ four-component Dirac fermions moving in plane and interacting via an instantaneous Coulomb interaction. In strong-coupling limit we identify critical number flavors ${N}_{fc}=4.8(2)$ separating insulating from conducting phase. This transition corresponds to location quantum point, use fit equation state chiral order parameter estimate...
We present results from simulations of two color QCD with Wilson quark flavors in the presence a chemical potential $\ensuremath{\mu}$ at different lattice spacings. The equation state, conformal anomaly, superfluid order parameter, and Polyakov line are all discussed. Our suggest that transitions hadronic to matter confined deconfined occur distinct values $\ensuremath{\mu}$, consistent existence quarkyonic phase this model.
A 2+1 dimensional fermion field theory is proposed as a model for the low-energy electronic excitations in monolayer graphene. The consists of N=2 four-component Dirac fermions moving plane and interacting via contact interaction between charge densities. For strong couplings there continuous transition to Mott insulting phase. We present results an extensive numerical study model's critical region, including order parameter, its associated susceptibility, first time quasiparticle...
It is expected that nucleons and their parity partners become degenerate when chiral symmetry restored. We investigate this question in the context of thermal transition from hadronic phase to quark-gluon plasma, using lattice QCD simulations with ${N}_{f}=2+1$ flavors. observe a clear sign doubling plasma. Besides, we find nucleon ground state is, within uncertainty, largely independent temperature, whereas temperature effects are substantial negative-parity (${N}^{*}$) channel, already...
The relationship between GH, insulin-like growth factor I (IGF-I), IGF-binding protein-1 (IGFBP-1), and insulin may be critical to the understanding of variation in early growth, especially small for gestational age (SGA) baby.To investigate these relationships, we have undertaken 12-h hormone profiles 26 babies (13 SGA) at a median 4.5 days age.GH levels were measured every 10 min; IGFBP-1 20 min.Mean hormones IGF-I (from single sample) related size birth.The GH data analyzed by Pulsar time...
We discuss the phase structure and equation of state for QCD at non-zero temperature density. Derivatives ln Z with respect to quark chemical potential µq up fourth order are calculated 2-flavor QCD, enabling estimates pressure, number density associated susceptibilities as functions via a Taylor series expansion. Also, transition line 2 3-flavor critical endpoint in (T, µq) plane investigated low regime.
We present numerical results for noncompact three-dimensional quantum electrodynamics numbers of flavors ${N}_{f}=1$ and ${N}_{f}=4$. In particular, we address the issue whether chiral symmetry is spontaneously broken in continuum limit, obtain a positive answer ${N}_{f}=1$, with dimensionless condensate estimated to be ${\ensuremath{\beta}}^{2}⟨\overline{\ensuremath{\psi}}\ensuremath{\psi}⟩\ensuremath{\simeq}O({10}^{\ensuremath{-}3})$, implying that critical number ${N}_{fc}>1$. also...
We study what happens to the N , Δ and Ω baryons in hadronic gas quark-gluon plasma, with particular interest parity doubling its emergence as plasma is heated. This done using simulations of lattice QCD, employing FASTSUM anisotropic f = 2 + 1 ensembles, four temperatures below above deconfinement transition temperature. Below T c we find that positive-parity groundstate masses are largely temperature independent, whereas negative-parity ones reduced considerably increases. may be for...