1,828 research outputs found
A Physical Origin for Singular Support Conditions in Geometric Langlands Theory
We explain how the nilpotent singular support condition introduced into the
geometric Langlands conjecture by Arinkin and Gaitsgory arises naturally from
the point of view of N = 4 supersymmetric gauge theory. We define what it means
in topological quantum field theory to restrict a category of boundary
conditions to the full subcategory of objects compatible with a fixed choice of
vacuum, both in functorial field theory and in the language of factorization
algebras. For B-twisted N = 4 gauge theory with gauge group G, the moduli space
of vacua is equivalent to h*/W , and the nilpotent singular support condition
arises by restricting to the vacuum 0 in h*/W. We then investigate the
categories obtained by restricting to points in larger strata, and conjecture
that these categories are equivalent to the geometric Langlands categories with
gauge symmetry broken to a Levi subgroup, and furthermore that by assembling
such for the groups GL_n for all positive integers n one finds a hidden
factorization structure for the geometric Langlands theory.Comment: 55 pages, 5 figures, more improvements to the expositio
Geometric Langlands Twists of N = 4 Gauge Theory from Derived Algebraic Geometry
We develop techniques for describing the derived moduli spaces of solutions
to the equations of motion in twists of supersymmetric gauge theories as
derived algebraic stacks. We introduce a holomorphic twist of N=4
supersymmetric gauge theory and compute the derived moduli space. We then
compute the moduli spaces for the Kapustin-Witten topological twists as its
further twists. The resulting spaces for the A- and B-twist are closely related
to the de Rham stack of the moduli space of algebraic bundles and the de Rham
moduli space of flat bundles, respectively. In particular, we find the
unexpected result that the moduli spaces following a topological twist need not
be entirely topological, but can continue to capture subtle algebraic
structures of interest for the geometric Langlands program.Comment: 55 pages; minor correction
Explaining Classifiers using Adversarial Perturbations on the Perceptual Ball
We present a simple regularization of adversarial perturbations based upon
the perceptual loss. While the resulting perturbations remain imperceptible to
the human eye, they differ from existing adversarial perturbations in that they
are semi-sparse alterations that highlight objects and regions of interest
while leaving the background unaltered. As a semantically meaningful adverse
perturbations, it forms a bridge between counterfactual explanations and
adversarial perturbations in the space of images. We evaluate our approach on
several standard explainability benchmarks, namely, weak localization,
insertion deletion, and the pointing game demonstrating that perceptually
regularized counterfactuals are an effective explanation for image-based
classifiers.Comment: CVPR 202
A review of Australian approaches for monitoring, assessing and reporting estuarine condition: III. Evaluation against international best practice and recommendations for the future
In this final component of a three-part review, we present a national synthesis and evaluation of approaches for monitoring, assessing and reporting estuarine condition across Australia. Progress is evaluated against objective criteria that together provide a model of international best practice. We critically assess the limitations, inconsistencies and gaps that are evident across Australian jurisdictions, and identify common obstacles to future progress. Major strengths and successes are also highlighted, together with specific examples of best practice from around Australia that are transferable to other States and beyond. Significant obstacles to greater national coordination of monitoring and reporting practices include inconsistent spatial scales of management, pluralistic governance structures and the lack of any overarching legislation. Nonetheless, many perceptible advances have been made over the last decade across Australia in estuarine monitoring and health assessment, and there is great potential for further progress. Finally, we provide a list of recommendations to address some of the most pressing limitations and gaps, and support improved future monitoring, assessment and reporting for Australian estuaries
A review of Australian approaches for monitoring, assessing and reporting estuarine condition: I. International context and evaluation criteria
© 2016 Elsevier Ltd Given the immeasurable value of estuaries and their severe and growing pressures, sound understanding and reporting of estuarine condition is essential for their effective management and sustainable development. In light of this, we aim to provide a timely and comprehensive three-part review of the approaches currently employed for monitoring, assessing and reporting estuarine condition, focussing on Australian systems. Here, in Part 1, we establish the national and international context of our review and define globally-relevant evaluation criteria against which to assess Australian progress. We achieve this by examining effective monitoring, assessment and reporting programs from around the world and characterising ‘best practice’. We then highlight the Australian historical context and consider recent policies, frameworks, guidelines and legislation relating to the monitoring and reporting of estuarine condition nationwide
UMS_HR_Important Information on the Families First Coronavirus Response Act Email
Email from Chris Lindstrom, Co-Interim CHRO, Human Resources and Tracy Elliott, Co-Interim CHRO, Human Resources to University of Maine System employees regarding the Families First Coronavirus Response Act, (FFCRA), that took effect April 1, 2020
A manifesto for a socio-technical approach to NHS and social care IT-enabled business change - to deliver effective high quality health and social care for all
80% of IT projects are known to fail. Adopting a socio-technical
approach will help them to succeed in the future.
The socio-technical proposition is simply that any work system comprises
both a social system (including the staff, their working practices, job roles,
culture and goals) and a technical system (the tools and technologies that
support and enable work processes). These elements together form a
single system comprising interacting parts. The technical and the social
elements need to be jointly designed (or redesigned) so that they are
congruent and support one another in delivering a better service.
Focusing on one aspect alone is likely to be sub-optimal and wastes
money (Clegg, 2008). Thus projects that just focus on the IT will almost
always fail to deliver the full benefits
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