A5009908069- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Wireless Body Area Networks
- Distributed and Parallel Computing Systems
- Cold Atom Physics and Bose-Einstein Condensates
- Advancements in PLL and VCO Technologies
- Radio Frequency Integrated Circuit Design
- Algorithms and Data Compression
- Rare-earth and actinide compounds
- Heat Transfer and Boiling Studies
- Advanced Algebra and Geometry
- Heat transfer and supercritical fluids
- Medical Imaging Techniques and Applications
- Markov Chains and Monte Carlo Methods
- Advanced Condensed Matter Physics
- Spectral Theory in Mathematical Physics
- Gas Dynamics and Kinetic Theory
- Advanced Materials Characterization Techniques
Helsinki Institute of Physics
2009-2022
University of Helsinki
2009-2022
University of Bern
2022
Swansea University
2020
Duke University
2016-2018
University of Southern Denmark
2015-2017
University of Stavanger
2016
RIKEN Center for Computational Science
2014-2016
European Organization for Nuclear Research
2016
University of Jyväskylä
2009-2012
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...
We study SU(2) gauge theory with two Dirac fermions in the adjoint representation of group on lattice. Using clover improved Wilson fermion action hypercubic truncated stout smearing we perform simulations at larger coupling than before. measure evolution constant using step scaling method Schr\"odinger functional and remaining discretization effects. At weak observe significant effects, which make it difficult to obtain a fully controlled continuum limit. Nevertheless, data remains...
We study the two-dimensional lattice Thirring model in presence of a fermion chemical potential. Our is asymptotically free and contains massive fermions that mimic baryon light bosons pions. Hence, it useful toy for QCD, especially since it, too, suffers from sign problem auxiliary field formulation In this work, we formulate both world line fermion-bag representations show can be completely eliminated with open boundary conditions when are massless. able accurately compute variety...
We study SU(2) gauge theory with two fermion flavors in the adjoint representation. Using a clover improved HEX smeared action and gradient flow running coupling allows us to simulate larger lattice size than before. find an infrared fixed point after continuum extrapolation range $4.3\ensuremath{\lesssim}{g}^{*2}\ensuremath{\lesssim}4.8$. also measure mass anomalous dimension value $0.25\ensuremath{\lesssim}{\ensuremath{\gamma}}^{*}\ensuremath{\lesssim}0.28$ at point.
We study the evolution of coupling in SU(2) gauge field theory with ${N}_{f}=8$ fundamental fermion flavors on lattice. This model is expected to have an infrared fixed point at high coupling. use HEX-smeared Wilson-clover action, and measure gradient flow running Dirichlet boundary conditions. Extrapolating our results continuum, we find ${g}_{*}^{2}=8.24(59{)}_{\ensuremath{-}1.64}^{+0.97}$, statistical systematic error estimates. also anomalous dimension quark mass operator, its value...
We present preliminary results of lattice simulations SU(2) gauge theory with two Wilson fermions in the adjoint representation.This has recently attracted considerable attention because it might possess an infrared fixed point (or almost-fixed-point), and hence be a candidate for walking technicolor theory.In this work we study particle spectrum theory, compare more familiar fields flavors fundamental representation fermions.
According to the Ideal Walking Technicolor paradigm large mass anomalous dimensions arise in gauged Nambu--Jona-Lasinio (NJL) models when four-fermion coupling is sufficiently strong induce spontaneous symmetry breaking an otherwise conformal gauge theory. We therefore study $SU(2)$ NJL model with two adjoint fermions using lattice simulations. The infrared phase at small while it displays a chirally broken couplings. In we find that dimension varies reaching $\gamma_m \sim 1$ close chiral...
We present a non perturbative study of SU(2) gauge theory with two fundamental Dirac flavours.We discuss how the model can be used as template for composite Dark Matter (DM).We estimate one particular interaction DM candidate Standard Model : through photon exchange computing electric polarizability candidate.Finally, we briefly viability given experimental constraints.
We present a lattice study of Nambu Jona-Lasinio (NJL) model using Wilson fermions. Four fermion interactions are natural part several extensions the Standard Model, appearing as low energy description more fundamental theory. In models dynamical electroweak symmetry breaking they used to endow Model fermions with masses. infrared conformal these interaction, when sufficiently strong, can alter dynamics fixed point, turning theory into (near) desirable features for building. As first step...
We present a measurement of the running coupling in SU(2) with two adjoint fermions Yang-Mills gradient flow scheme. The simulations are performed Schrodinger Functional boundary conditions using an improved HEX-smeared Wilson fermion action. obtain step scaling function by defining at scale relative to finite size lattice. find continuum limit non-trivial infrared fixed point.
We present a numerical study of the spectrum an asymptotically nonfree SU(2) gauge theory with ${N}_{f}=24$ massive fermion flavors. For such large number flavors, asymptotic freedom is lost and massless governed by Gaussian fixed point at long distances. If fermions are they decouple low energy scales confining. scaling law for masses hadrons, glueballs string tension as functions mass. The hadrons become effectively heavy quark systems, approximately twice mass, whereas scale confinement,...
We study the running of coupling in SU(2) gauge theory with 8 massless fundamental representation fermion flavours, using gradient flow method Schr\"odinger functional boundary conditions. Gradient allows us to measure robust continuum limit for step scaling function. The results show a clear indication infrared fixed point consistent perturbation theory.
We present a perturbative calculation of the improvement coefficients SU(2) gauge theory with adjoint representation Wilson-clover fermions and using Schrödinger functional boundary conditions.The computation terms is necessary for full O(a) improvement.With two flavours this called Minimal Walking Technicolor model.