1,483 research outputs found
Topology of Minimal Walking Technicolor
We perform a lattice study of the topological susceptibility and instanton
size distribution of the \su{2} gauge theory with two adjoint Dirac fermions
(also known as Minimal Walking Technicolor), which is known to be in the
conformal window. In the theory deformed with a small mass term, by drawing a
comparison with the pure gauge theory, we find that topological observables are
decoupled from the fermion dynamics. This provides further evidence for the
infrared conformality of the theory. A study of the instanton size distribution
shows that this quantity can be used to detect the onset of finite size
effects.Comment: An error in the analysis has been corrected that does not affect the
result. Discussions have been expanded, comments and references added,
conclusions unchanged. Version to appear on EPJ
Large mass hierarchies from strongly-coupled dynamics
Motivated by the absence of signals of new physics at the LHC, which seems to imply the presence of large mass hierarchies, we investigate the theoretical possibility that these could arise dynamically in new strongly-coupled gauge theories extending the standard model of particle physics. To this purpose, we study lattice data on non-Abelian gauge theories in the (near-)conformal regime---specifically, SU(2) with Nf=1 and 2 dynamical fermion flavours in the adjoint representation. We focus our attention on the ratio R between the masses of the lightest spin-2 and spin-0 resonances, and draw comparisons with a simple toy model in the context of gauge/gravity dualities. For models in which large anomalous dimensions arise dynamically, we show indications that this mass ratio can be large, with R>5. Moreover, our results suggest that R might be related to universal properties of the IR fixed point. Our findings provide an interesting step towards understanding large mass ratios in the non-perturbative regime of quantum field theories with (near) IR conformal behaviour
Status of reproducibility and open science in hep-lat in 2021
As a fully computational discipline, Lattice Field Theory has the potential
to give results that anyone with sufficient computational resources can
reproduce, going from input parameters to published numbers and plots correct
to the last byte. After briefly motivating and outlining some of the key steps
in making lattice computations reproducible, this contribution presents the
results of a survey of all 1,229 submissions to the hep-lat arXiv in 2021 of
how explicitly reproducible each is. Areas where LFT has historically been well
ahead of the curve are highlighted, as are areas where there are opportunities
to do more.Comment: 9 pages, 9 figures. Contribution to the 39th International Symposium
on Lattice Field Theory, 8th-13th August, 2022, Bonn, German
Status of reproducibility and open science in hep-lat in 2021
As a fully computational discipline, Lattice Field Theory has the potential to give results that anyone with sufficient computational resources can reproduce, going from input parameters to published numbers and plots correct to the last byte. After briefly motivating and outlining some of the key steps in making lattice computations reproducible, this contribution presents the results of a survey of all 1,229 submissions to the hep-lat arXiv in 2021 of how explicitly reproducible each is. Areas where LFT has historically been well ahead of the curve are highlighted, as are areas where there are opportunities to do more
Application of bagging, boosting and stacking to intrusion detection
This paper investigates the possibility of using ensemble algorithms to improve the performance of network intrusion detection systems. We use an ensemble of three different methods, bagging, boosting and stacking, in order to improve the accuracy and reduce the false positive rate. We use four different data mining algorithms, naïve bayes, J48 (decision tree), JRip (rule induction) and iBK( nearest neighbour), as base classifiers for those ensemble methods. Our experiment shows that the prototype which implements four base classifiers and three ensemble algorithms achieves an accuracy of more than 99% in detecting known intrusions, but failed to detect novel intrusions with the accuracy rates of around just 60%. The use of bagging, boosting and stacking is unable to significantly improve the accuracy. Stacking is the only method that was able to reduce the false positive rate by a significantly high amount (46.84%); unfortunately, this method has the longest execution time and so is insufficient to implement in the intrusion detection fiel
Open Science in Lattice Gauge Theory community
Open science aims to make scientific research processes, tools and results accessible to all scientific communities, creating trust in science and enabling digital competences to be realized in research, leading to increased innovation. It provides standard and transparent pathways to conducting research and fosters best practices for collecting, analysing, preserving, sharing and reusing data, software, workflows and other outputs through collaborative networks. Open Science appears to be becoming the norm with its applications spanning throughout the whole research cycle of a project. The importance of making Open Science a reality is nowadays reflected in funding policies, research infrastructure and politics. In these proceedings we present the basic Open Science principles explaining briefly best practices for materialising Open Science. Subsequently, we present the results of the landscaping survey of Open Science in the Lattice Gauge Theories community. Finally, we provide directions in which the Lattice Gauge Theory community could move in order to enhance Openness and FAIRness (Findability, Accessibility, Interoperability, Reusability) in Science
Spectroscopy of (4) lattice gauge theory with 3 antisymmetric fermions
We perform numerical calculations of masses and decay constants of the lightest (flavoured) pseu- doscalar, vector and axialvector mesons in the (4) lattice gauge theory with three Dirac fermions in the antisymmetric representation. The corresponding continuum theory plays an important role in certain ultra-violet complete realisations of composite Higgs, partial top compositeness, and composite dark matter models. In addition, we measure the masses of other flavoured mesons in spin-0 and 1 channels, as well as the first excited state of the vector mesons. Using the gradient flow to set the scale, we carry out the continuum extrapolation and show preliminary results for the meson spectrum of the theory
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