1,010 research outputs found
Twisted Bethe equations from a twisted S-matrix
All-loop asymptotic Bethe equations for a 3-parameter deformation of
AdS5/CFT4 have been proposed by Beisert and Roiban. We propose a Drinfeld twist
of the AdS5/CFT4 S-matrix, together with c-number diagonal twists of the
boundary conditions, from which we derive these Bethe equations. Although the
undeformed S-matrix factorizes into a product of two su(2|2) factors, the
deformed S-matrix cannot be so factored. Diagonalization of the corresponding
transfer matrix requires a generalization of the conventional algebraic Bethe
ansatz approach, which we first illustrate for the simpler case of the twisted
su(2) principal chiral model. We also demonstrate that the same twisted Bethe
equations can alternatively be derived using instead untwisted S-matrices and
boundary conditions with operatorial twists.Comment: 42 pages; v2: a new appendix on sl(2) grading, 2 additional
references, and some minor changes; v3: improved Appendix D, additional
references, and further minor changes, to appear in JHE
Red green blue emissive lead sulfide quantum dots: heterogeneous synthesis and applications.
Visible emission colloidal quantum dots (QDs) have shown promise in optical and optoelectronic applications. These QDs are typically composed of relatively expensive elements in the form of indium, cadmium, and gallium since alternative candidate materials exhibiting similar properties are yet to be realized. Herein, for the first time, we report red green blue (RGB) photoluminescences with quantum yields of 18% from earth-abundant lead sulfide (PbS) QDs. The visible emissive property is mainly attributed to a high degree of crystallinity even for the extremely small QD sizes (1-3 nm), which is realized by employing a heterogeneous reaction methodology at high growth temperatures (>170 °C). We demonstrate that the proposed heterogeneous synthetic method can be extended to the synthesis of other metal chalcogenide QDs, such as zinc sulfide and zinc selenide, which are promising for future industrial applications. More importantly, benefiting from the enlarged band gaps, the as-prepared PbS solar cells show an impressive open circuit voltage (∼0.8 V) beyond that reported to date
Quantitative analysis of S. mutans and S. sobrinus cultivated independently and adhered to polished orthodontic composite resins
Klebanov-Witten flows in M-theory
We study renormalization group flows among three dimensional superconformal
gauge theories which closely resemble the renowned Klebanov-Witten flow in four
dimensions. In the large N limit, each theory appearing in the flow is
holographically dual to M-theory on AdS4 times a toric Sasaki-Einstein
seven-manifold. The theories are obtained through the so-called flavoring
method, which adds some fundamental matter fields to the dimensionally reduced
Klebanov-Witten theories. We reconfirm the matching between the gauge theories
and the dual geometries by comparing the chiral ring structure. As a more
refined test of the flows, we compute the three-sphere partition function of
the gauge theories. The square of the free energy, inversely proportional to
the volume of the seven-manifold, decreases by a universal ratio 16/27 for all
flows considered in this paper.Comment: 38 pages, 8 figures; v2. references added, minor improvement
Strain engineering and one-dimensional organization of metal-insulator domains in single-crystal VO2 beams
Spatial phase inhomogeneity at the nano- to microscale is widely observed in
strongly-correlated electron materials. The underlying mechanism and
possibility of artificially controlling the phase inhomogeneity are still open
questions of critical importance for both the phase transition physics and
device applications. Lattice strain has been shown to cause the coexistence of
metallic and insulating phases in the Mott insulator VO2. By continuously
tuning strain over a wide range in single-crystal VO2 micro- and nanobeams,
here we demonstrate the nucleation and manipulation of one-dimensionally
ordered metal-insulator domain arrays along the beams. Mott transition is
achieved in these beams at room temperature by active control of strain. The
ability to engineer phase inhomogeneity with strain lends insight into
correlated electron materials in general, and opens opportunities for designing
and controlling the phase inhomogeneity of correlated electron materials for
micro- and nanoscale device applications.Comment: 14 pages, 4 figures, with supplementary informatio
Study of B -> \rho \pi decays at Belle
This paper describes a study of B meson decays to the pseudoscalar-vector
final state \rho\pi using 31.9\times 10^6 B\bar{B} events collected with the
Belle detector at KEKB. The branching fractions B(B^+ \to \rho^0\pi^+) =
(8.0^{+2.3+0.7}_{-2.0-0.7}) \times 10^{-6} and B(B^0 -> \rho^{+-} \pi^{-+}) =
(20.8^{+6.0+2.8}_{-6.3-3.1}) \times 10^{-6} are obtained. In addition, a 90%
confidence level upper limit of B(B^0 \to \rho^0\pi^0) < 5.3 \times 10^{-6}is
reported.Comment: 14 pages, 3 figures, to be submitted to Phys. Lett.
Consumer perceptions of co-branding alliances: Organizational dissimilarity signals and brand fit
This study explores how consumers evaluate co-branding alliances between dissimilar partner firms. Customers are well aware that different firms are behind a co-branded product and observe the partner firms’ characteristics. Drawing on signaling theory, we assert that consumers use organizational characteristics as signals in their assessment of brand fit and for their purchasing decisions. Some organizational signals are beyond the control of the co-branding partners or at least they cannot alter them on short notice. We use a quasi-experimental design and test how co-branding partner dissimilarity affects brand fit perception. The results show that co-branding partner dissimilarity in terms of firm size, industry scope, and country-of-origin image negatively affects brand fit perception. Firm age dissimilarity does not exert significant influence. Because brand fit generally fosters a benevolent consumer attitude towards a co-branding alliance, the findings suggest that high partner dissimilarity may reduce overall co-branding alliance performance
Improving Clinical Outcomes and Quality of Life with Massage Therapy in Youth and Young Adults with Cystic Fibrosis: a Pilot Study
Background: Cystic Fibrosis (CF) is an autosomal recessive disorder of exocrine glands characterized by abnormal production of thick mucus, primar-ily in bronchi of the lungs. Individuals experience recurrent respiratory infections, increased work of breathing, cough and musculoskeletal changes with pain. Previous research found that massage therapy (MT) decreased pain, muscle tightness, and anxiety in individuals with CF, but did not use valid/reliable measurements of quality of life (QOL).Purpose: To evaluate the effects of MT on QOL and clinical outcomes in individuals 8 to 21 years old with CF. Setting: A 622-bed nonprofit pediatric hospital in Ohio in the United States.Participants: Convenience sample of 24 patients with CF; 12 randomly assigned to treatment and control groups, respectively. Research Design and Intervention: Prospective two-group controlled pre/post pilot study using deep tissue myofascial trigger point massage over 10 to 12 weeks.Measurements: Pediatric Quality of Life Inven-tory (Peds QL 4.0); Cystic Fibrosis Questionnaire-Revised (CFQ-R); numeric rating scales (NRS) for pain, muscle tightness, ease of breathing, relax-ation; pulmonary function (PFT); single breath count; thoracic excursion (TE).Results: All participants were Caucasian; mean age 15.7 (SD = 3.5) years; 16 (66.6%) female. No significant differences were found in terms of age, gender, baseline pain between MT and control groups. At the final visit, compared to the control group, the children in MT group showed statistically significantly reduced muscle tight-ness (p = .048) with a large effect size (?²=0.163) and marginally statistically significantly higher levels of relaxation (p = .052), less pain (p = .076), and improved upper TE (p = .078) and lower TE (p = .056) scores with large and moderate effect sizes (?² = 0.156, ?² = 0.095, ?² = 0.083, and ?² = 0.073). No statistically significant differences in children’s and caregivers’ QOL scores between the two groups were found.Conclusions: Massage therapy was found to significantly reduce muscle tightness, marginally significantly help pain, relaxation, and thoracic excursion in participants with C
Cosmic Ray Anomalies from the MSSM?
The recent positron excess in cosmic rays (CR) observed by the PAMELA
satellite may be a signal for dark matter (DM) annihilation. When these
measurements are combined with those from FERMI on the total () flux
and from PAMELA itself on the ratio, these and other results are
difficult to reconcile with traditional models of DM, including the
conventional mSUGRA version of Supersymmetry even if boosts as large as
are allowed. In this paper, we combine the results of a previously
obtained scan over a more general 19-parameter subspace of the MSSM with a
corresponding scan over astrophysical parameters that describe the propagation
of CR. We then ascertain whether or not a good fit to this CR data can be
obtained with relatively small boost factors while simultaneously satisfying
the additional constraints arising from gamma ray data. We find that a specific
subclass of MSSM models where the LSP is mostly pure bino and annihilates
almost exclusively into pairs comes very close to satisfying these
requirements. The lightest in this set of models is found to be
relatively close in mass to the LSP and is in some cases the nLSP. These models
lead to a significant improvement in the overall fit to the data by an amount
dof in comparison to the best fit without Supersymmetry
while employing boosts . The implications of these models for future
experiments are discussed.Comment: 57 pages, 31 figures, references adde
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