55 research outputs found
E8 Quiver Gauge Theory and Mirror Symmetry
We show that the Higgs branch of a four-dimensional Yang-Mills theory, with
gauge and matter content summarised by an E_8 quiver diagram, is identical to
the generalised Coulomb branch of a four-dimensional superconformal strongly
coupled gauge theory with E_8 global symmetry. This is the final step in
showing that there is a Higgs-Coulomb identity of this kind for each of the
cases {0}, A_1, A_2, D_4, E_6, E_7 and E_8. This series of equivalences
suggests the existence of a mirror symmetry between the quiver theories and the
strongly coupled theories. We also discuss how to interpret the parameters of
the quiver gauge theory in terms of the Hanany-Witten picture.Comment: 19 pages, 3 figures, references adde
Data management for production quality deep learning models: Challenges and solutions
Deep learning (DL) based software systems are difficult to develop and maintain in industrial settings due to several challenges. Data management is one of the most prominent challenges which complicates DL in industrial deployments. DL models are data-hungry and require high-quality data. Therefore, the volume, variety, velocity, and quality of data cannot be compromised. This study aims to explore the data management challenges encountered by practitioners developing systems with DL components, identify the potential solutions from the literature and validate the solutions through a multiple case study. We identified 20 data management challenges experienced by DL practitioners through a multiple interpretive case study. Further, we identified 48 articles through a systematic literature review that discuss the solutions for the data management challenges. With the second round of multiple case study, we show that many of these solutions have limitations and are not used in practice due to a combination of four factors: high cost, lack of skill-set and infrastructure, inability to solve the problem completely, and incompatibility with certain DL use cases. Thus, data management for data-intensive DL models in production is complicated. Although the DL technology has achieved very promising results, there is still a significant need for further research in the field of data management to build high-quality datasets and streams that can be used for building production-ready DL systems. Furthermore, we have classified the data management challenges into four categories based on the availability of the solutions.(c) 2022 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Actions and symmetries of NSR superstrings and D-strings
We present all NSR superstring and super-D-string actions invariant under a
set of prescribed gauge transformations, and characterize completely their
global symmetries. In particular we obtain locally supersymmetric Born-Infeld
actions on general backgrounds in a formulation with extra target space
dimensions. The nontrivial global symmetries of the superstring actions
correspond to isometries of the background, whereas super-D-string actions can
have additional symmetries acting nontrivially also on the coordinates of the
extra dimensions.Comment: 4 pages, references added and errors correcte
AdS spacetimes from wrapped M5 branes
We derive a complete geometrical characterisation of a large class of
, and supersymmetric spacetimes in eleven-dimensional
supergravity using G-structures. These are obtained as special cases of a class
of supersymmetric , and
geometries, naturally associated to M5-branes wrapping calibrated cycles in
manifolds with , SU(3) or SU(2) holonomy. Specifically, the latter class
is defined by requiring that the Killing spinors satisfy the same set of
projection conditions as for wrapped probe branes, and that there is no
electric flux. We show how the R-symmetries of the dual field theories appear
as isometries of the general AdS geometries. We also show how known solutions
previously constructed in gauged supergravity satisfy our more general
G-structure conditions, demonstrate that our conditions for half-BPS
geometries are precisely those of Lin, Lunin and Maldacena, and construct some
new singular solutions.Comment: 1+56 pages, LaTeX; v2, references added; v3, minor corrections, final
version to appear in JHE
Supergravity Duals for N=2 Gauge Theories
We construct supergravity solutions for Dp-branes at orbifold points. The
solutions are written in terms of a single function, which is the solution to a
nonlinear differential equation. The near horizon limits of these solutions are
dual, in the AdS/CFT sense, to super-Yang-Mills theories with 8 supercharges in
various dimensions. In particular, we present a dual to N=2 SU(N) SYM theory in
3+1 dimensions, and analyse some aspects of the duality.Comment: 15 pages, late
Supergravity Solution of Intersecting Branes and AdS/CFT with Flavor
We construct the supergravity solution for fully localized D2/D6
intersection. The near horizon limit of this solution is the supergravity dual
of supersymmetric Yang-Mills theory in 2+1 dimensions with flavor. We use this
solution to formulate mirror symmetry of 2+1 dimensional gauge theories in the
language of AdS/CFT correspondence. We also construct the supergravity dual of
a non-commutative gauge theory with fundamental matter.Comment: 17 Pages, 2 figures, references added. Minor corrections to eqs (5.3)
and (5.4
Supergravity Solutions for branes
We find a large class of supersymmetric solutions in the
background with NS fluxes. This two-parameter family of solutions preserves 8
of the 16 supersymmetries of the background.Comment: References added. 13 pages, late
Revisiting D-branes in
We find the most general supergravity solution in an
background preserving an symmetry and half the
supersymmetries. Contrary to previous expectations from boundary state
arguments, it is shown that no solutions exist containing localized brane
sources.Comment: 9 pages, LaTe
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