17,261 research outputs found
Laplaza Sets, or How to Select Coherence Diagrams for Pseudo Algebras
We define a general concept of pseudo algebras over theories and 2-theories.
A more restrictive such notion was introduced by Hu and Kriz, but as noticed by
M. Gould, did not capture the desired examples. The approach taken in this
paper corrects the mistake by introducing a more general concept, allowing more
flexibility in selecting coherence diagrams for pseudo algebras.Comment: 21 pages. To appear in the Advances of Mathematics. Exposition
improved, notion of operad with degeneracies removed as a simplification,
definition of pseudo algebra improved
Skyrme insulators: insulators at the brink of superconductivity
Current theories of superfluidity are based on the idea of a coherent quantum
state with topologically protected, quantized circulation. When this
topological protection is absent, as in the case of He-A, the coherent
quantum state no longer supports persistent superflow. Here we argue that the
loss of topological protection in a superconductor gives rise to an insulating
ground state. We specifically introduce the concept of a Skyrme insulator to
describe the coherent dielectric state that results from the topological
failure of superflow carried by a complex vector order parameter. We apply this
idea to the case of SmB, arguing that the observation of a diamagnetic
Fermi surface within an insulating bulk can be understood in terms of a Skyrme
insulator. Our theory enables us to understand the linear specific heat of
SmB in terms of a neutral Majorana Fermi sea and leads us to predict that
in low fields of order a Gauss, SmB6 will develop a Meissner effect.Comment: 10 pages, 4 figure
An Effective Field Theory for Fractional Quantum Hall Systems near
We propose an effective field theory (EFT) of fractional quantum Hall systems
near the filling fraction that flows to pertinent IR candidate
phases, including non-abelian Pfaffian, anti-Pfaffian, and particle-hole
Pfaffian states (Pf, APf, and PHPf). Our EFT has a 2+1 O(2)
Chern-Simons gauge theory coupled to four Majorana fermions by a discrete
charge conjugation gauge field, with Gross-Neveu-Yukawa-Higgs terms. Including
deformations via a Higgs condensate and fermion mass terms, we can map out a
phase diagram with tunable parameters, reproducing the prediction of the
recently-proposed percolation picture and its gapless topological quantum phase
transitions. Our EFT captures known features of both gapless and gapped sectors
of time-reversal-breaking domain walls between Pf and APf phases. Moreover, we
find that PfAPf domain walls have higher tension than domain walls in the
PHPf phase. Then the former, if formed, may transition to the
energetically-favored PHPf domain walls; this could, in turn, help further
induce a bulk transition to PHPf.Comment: 72 pages, 10 figures, 5 tables. Many appendices. Add Sec 2.2, new
remarks in Conclusion, and other clarifications. Accepted by Physical Review
Researc
A Conceptual Design of an Inattention Management Middleware with Adaptive Target Saliency
© 2020 IEEE. We present a conceptual design of an inattention management middleware with adaptive target saliency. The design objective is to provide mechanisms for managing operator inattention in multi-display multitasking applications. The conceptual design integrates ideas from situational awareness into its mechanisms to provide dynamic target saliency as a means to 1) guide operators through sub-tasks by drawing attention to high priority targets; and 2) guide operators on how to efficiently split their attention between tasks. We motivate the design by analysis of the results following a formative study with a prototype version of the conceptual design
Inattention-Management Middleware for Human-in-the-Loop Multi-Display Applications
Operator inattention is an important and unsolved
problem in mission critical multi-display systems where a single
or a group of operators continuously monitor information flows
on distributed displays. In this paper we present a novel system
solution to this problem and a middleware for supporting flexible
attention-aware applications for a variety of domains. Some of
the most significant functionality includes direct querying of
the application’s attention state, custom callback definitions to
be executed on specific attention events or application updates,
inter-application message routing, and pushing custom notification
with relative location information to any other registered
application. We evaluate our middleware by developing three
applications that both demonstrate the efficacy and versatility of
the system and provide performance estimates in terms of latency
as a function of payload size
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