8 research outputs found
On the perturbative chiral ring for marginally deformed N=4 SYM theories
For \cal{N}=1 SU(N) SYM theories obtained as marginal deformations of the
\cal{N}=4 parent theory we study perturbatively some sectors of the chiral ring
in the weak coupling regime and for finite N. By exploiting the relation
between the definition of chiral ring and the effective superpotential we
develop a procedure which allows us to easily determine protected chiral
operators up to n loops once the superpotential has been computed up to (n-1)
order. In particular, for the Lunin-Maldacena beta-deformed theory we determine
the quantum structure of a large class of operators up to three loops. We
extend our procedure to more general Leigh-Strassler deformations whose chiral
ring is not fully understood yet and determine the weight-two and weight-three
sectors up to two loops. We use our results to infer general properties of the
chiral ring.Comment: LaTex, 40 pages, 4 figures, uses JHEP3; v2: minor correction
gamma_i Deformed Lax Pair for Rotating Strings in the Fast Motion Limit
A 3-parameter generalization of the Lunin-Maldacena background has recently
been constructed by Frolov. This gamma_i-deformed background is
non-supersymmetric. We consider strings in this gamma_i-deformed R \times S^5
background rotating in three orthogonal planes (the 3-spin sector) in a fast
motion limit, in which the total angular momentum J is assumed to be large. We
show that there exists a consistent transformation which takes the undeformed
equations of motion into the gamma_i-deformed equations of motion. This
transformation is used to construct a Lax pair for the bosonic part of the
gamma_i-deformed theory in the fast motion limit. This implies the
integrability of the bosonic part of the gamma_i-deformed string sigma model in
the fast motion limit.Comment: 21 page
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
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
Impact of opioid-free analgesia on pain severity and patient satisfaction after discharge from surgery: multispecialty, prospective cohort study in 25 countries
Background: Balancing opioid stewardship and the need for adequate analgesia following discharge after surgery is challenging. This study aimed to compare the outcomes for patients discharged with opioid versus opioid-free analgesia after common surgical procedures.Methods: This international, multicentre, prospective cohort study collected data from patients undergoing common acute and elective general surgical, urological, gynaecological, and orthopaedic procedures. The primary outcomes were patient-reported time in severe pain measured on a numerical analogue scale from 0 to 100% and patient-reported satisfaction with pain relief during the first week following discharge. Data were collected by in-hospital chart review and patient telephone interview 1 week after discharge.Results: The study recruited 4273 patients from 144 centres in 25 countries; 1311 patients (30.7%) were prescribed opioid analgesia at discharge. Patients reported being in severe pain for 10 (i.q.r. 1-30)% of the first week after discharge and rated satisfaction with analgesia as 90 (i.q.r. 80-100) of 100. After adjustment for confounders, opioid analgesia on discharge was independently associated with increased pain severity (risk ratio 1.52, 95% c.i. 1.31 to 1.76; P < 0.001) and re-presentation to healthcare providers owing to side-effects of medication (OR 2.38, 95% c.i. 1.36 to 4.17; P = 0.004), but not with satisfaction with analgesia (beta coefficient 0.92, 95% c.i. -1.52 to 3.36; P = 0.468) compared with opioid-free analgesia. Although opioid prescribing varied greatly between high-income and low- and middle-income countries, patient-reported outcomes did not.Conclusion: Opioid analgesia prescription on surgical discharge is associated with a higher risk of re-presentation owing to side-effects of medication and increased patient-reported pain, but not with changes in patient-reported satisfaction. Opioid-free discharge analgesia should be adopted routinely