109 research outputs found
Beyond the Planar Limit in ABJM
In this article we consider gauge theories with a U(N)X U(N) gauge group. We
provide, for the first time, a complete set of operators built from scalar
fields that are in the bi fundamental of the two groups. Our operators
diagonalize the two point function of the free field theory at all orders in
1/N. We then use this basis to investigate non-planar anomalous dimensions in
the ABJM theory. We show that the dilatation operator reduces to a set of
decoupled harmonic oscillators, signaling integrability in a nonplanar large N
limit.Comment: v2: minor revisison
On the infrared behaviour of 3d Chern-Simons theories in N=2 superspace
We discuss the problem of infrared divergences in the N=2 superspace approach
to classically marginal three-dimensional Chern-Simons-matter theories.
Considering the specific case of ABJM theory, we describe the origin of such
divergences and offer a prescription to eliminate them by introducing
non-trivial gauge-fixing terms in the action. We also comment on the extension
of our procedure to higher loop order and to general three-dimensional
Chern-Simons-matter models.Comment: 26 pages, 6 figures, JHEP3; v2: minor corrections and references
added; v3: introduction expanded, presentation of section 3.3.1 improved,
references added, version to appear in JHE
ABJM Dibaryon Spectroscopy
We extend the proposal for a detailed map between wrapped D-branes in Anti-de
Sitter space and baryon-like operators in the associated dual conformal field
theory provided in hep-th/0202150 to the recently formulated AdS_4 \times
CP^3/ABJM correspondence. In this example, the role of the dibaryon operator of
the 3-dimensional CFT is played by a D4-brane wrapping a CP^2 \subset CP^3.
This topologically stable D-brane in the AdS_4 \times CP^3 is nothing but
one-half of the maximal giant graviton on CP^3.Comment: 26 page
The giant graviton on AdS_{4} x CP^{3} - another step towards the emergence of geometry
We construct the giant graviton on AdS_{4} x CP^{3} out of a four-brane
embedded in and moving on the complex projective space. This configuration is
dual to the totally anti-symmetric Schur polynomial operator
\chi_{R}(A_{1}B_{1}) in the 2+1-dimensional, N = 6 super Chern-Simons ABJM
theory. We demonstrate that this BPS solution of the D4-brane action is
energetically degenerate with the point graviton solution and initiate a study
of its spectrum of small fluctuations. Although the full computation of this
spectrum proves to be analytically intractable, by perturbing around a "small'"
giant graviton, we find good evidence for a dependence of the spectrum on the
size, \alpha_{0}, of the giant. This is a direct result of the changing shape
of the worldvolume as it grows in size.Comment: 46 pages, 7 figures. Further details added to section 6 - the
solutions to the leading order fluctuation equations and the leading order
spectrum have been obtained - and additional comments added to the
discussion. Additional references added. Mistake in section 2 correcte
Welding and lung cancer in a pooled analysis of case-control studies.
Several epidemiologic studies have indicated an increased risk of lung cancer among welders. We used the SYNERGY project database to assess welding as a risk factor for developing lung cancer. The database includes data on 15,483 male lung cancer cases and 18,388 male controls from 16 studies in Europe, Canada, China, and New Zealand conducted between 1985 and 2010. Odds ratios and 95% confidence intervals between regular or occasional welding and lung cancer were estimated, with adjustment for smoking, age, study center, and employment in other occupations associated with lung cancer risk. Overall, 568 cases and 427 controls had ever worked as welders and had an odds ratio of developing lung cancer of 1.44 (95% confidence interval: 1.25, 1.67) with the odds ratio increasing for longer duration of welding. In never and light smokers, the odds ratio was 1.96 (95% confidence interval: 1.37, 2.79). The odds ratios were somewhat higher for squamous and small cell lung cancers than for adenocarcinoma. Another 1,994 cases and 1,930 controls had ever worked in occupations with occasional welding. Work in any of these occupations was associated with some elevation of risk, though not as much as observed in regular welders. Our findings lend further support to the hypothesis that welding is associated with an increased risk of lung cancer
Quantum coherent control of a hybrid superconducting circuit made with graphene-based van der Waals heterostructures
Quantum coherence and control is foundational to the science and engineering
of quantum systems. In van der Waals (vdW) materials, the collective coherent
behavior of carriers has been probed successfully by transport measurements.
However, temporal coherence and control, as exemplified by manipulating a
single quantum degree of freedom, remains to be verified. Here we demonstrate
such coherence and control of a superconducting circuit incorporating
graphene-based Josephson junctions. Furthermore, we show that this device can
be operated as a voltage-tunable transmon qubit, whose spectrum reflects the
electronic properties of massless Dirac fermions traveling ballistically. In
addition to the potential for advancing extensible quantum computing
technology, our results represent a new approach to studying vdW materials
using microwave photons in coherent quantum circuits
Lessons from giant gravitons on
We implement Mikhailov's holomorphic curve construction to explore various
properties of giant gravitons in type IIB string theory on . By coloring the D-brane worldvolume, we are able to show how, in the
string theory, the giant graviton factorizes at its maximal size into two
dibaryons - topologically stable D-branes wrapping non-contractible cycles in
the . This is related to the structure of the symmetry group of the
emergent Klebanov-Witten gauge theory being a product -
instead of the canonical . Finally, we complete this study with a
systematic and detailed construction of the spectrum of small fluctuations
about the giant graviton configuration. Curiously, we find that the fluctuation
spectrum depends on the size of the giant. The similarity of the operator
structures in the Klebanov-Witten and ABJM theories leads us to believe that
the D4-brane giant graviton in type IIA string theory on factorizes into two dibaryons in a
qualitatively similar way.Comment: 39 pages; abstract reworded slightly; additional comments included in
subsection 3.3; section 5 revised with the addition of subsection 5.3; added
reference
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