12 research outputs found
Surprisingly Simple Spectra
The large N limit of the anomalous dimensions of operators in
super Yang-Mills theory described by restricted Schur polynomials, are studied.
We focus on operators labeled by Young diagrams that have two columns (both
long) so that the classical dimension of these operators is O(N). At large N
these two column operators mix with each other but are decoupled from operators
with columns. The planar approximation does not capture the large N
dynamics. For operators built with 2, 3 or 4 impurities the dilatation operator
is explicitly evaluated. In all three cases, in a certain limit, the dilatation
operator is a lattice version of a second derivative, with the lattice emerging
from the Young diagram itself. The one loop dilatation operator is diagonalized
numerically. All eigenvalues are an integer multiple of and there
are interesting degeneracies in the spectrum. The spectrum we obtain for the
one loop anomalous dimension operator is reproduced by a collection of harmonic
oscillators. This equivalence to harmonic oscillators generalizes giant
graviton results known for the BPS sector and further implies that the
Hamiltonian defined by the one loop large dilatation operator is
integrable. This is an example of an integrable dilatation operator, obtained
by summing both planar and non-planar diagrams.Comment: 34 page
Strings on Bubbling Geometries
We study gauge theory operators which take the form of a product of a trace
with a Schur polynomial, and their string theory duals. These states represent
strings excited on bubbling AdS geometries which are dual to the Schur
polynomials. These geometries generically take the form of multiple annuli in
the phase space plane. We study the coherent state wavefunction of the lattice,
which labels the trace part of the operator, for a general Young tableau and
their dual description on the droplet plane with a general concentric ring
pattern. In addition we identify a density matrix over the coherent states on
all the geometries within a fixed constraint. This density matrix may be used
to calculate the entropy of a given ensemble of operators. We finally recover
the BMN string spectrum along the geodesic near any circle from the ansatz of
the coherent state wavefunction.Comment: 41 pages, 12 figures, published version in JHE
Giant Graviton Oscillators
We study the action of the dilatation operator on restricted Schur
polynomials labeled by Young diagrams with p long columns or p long rows. A new
version of Schur-Weyl duality provides a powerful approach to the computation
and manipulation of the symmetric group operators appearing in the restricted
Schur polynomials. Using this new technology, we are able to evaluate the
action of the one loop dilatation operator. The result has a direct and natural
connection to the Gauss Law constraint for branes with a compact world volume.
We find considerable evidence that the dilatation operator reduces to a
decoupled set of harmonic oscillators. This strongly suggests that
integrability in N=4 super Yang-Mills theory is not just a feature of the
planar limit, but extends to other large N but non-planar limits.Comment: 72 page
Dielectric 5-Branes and Giant Gravitons in ABJM
We construct a supersymmetric NS5-brane wrapped on a twisted 5-sphere
expanding in the in , with D0-brane charge. This
configuration provides a realization of the stringy exclusion principle in
terms of giant D0-branes. In the maximal case the twisted 5-sphere reduces to a
and its energy can be accounted for both by a bound state of
D4-branes wrapping the and a bound state of D0-branes, a realization
on the gravity side of the symmetry of Young diagrams with rows and
columns. We discuss some generalizations of this configuration in M-theory
carrying angular momentum, some of them with an interpretation as giant
gravitons. We provide the microscopical description that allows to explore the
region of finite 't Hooft coupling.Comment: 26 pages, reference adde
Esc Anna Nery
AbstrAct Objectives: To conduct a reflective analysis of knowledge acquired concerning the use of acupuncture as a complementary treatment to treat individuals with hypertension; and discuss the contributions of acupuncture to nursing diagnoses among hypertensive individuals and those contributions' implications for nursing practice. Methods: Integrative literature review presenting a theoretical and philosophical reflection regarding the topic in the last five years. Results: The findings were organized into two categories: primary evidence of the practice as complementary treatment to care provided to hypertensive patients; and contributions to care delivery according to nursing-diagnosis based interventions. Conclusion: Evidence shows the potential of acupuncture as complementary treatment and the potential for it to be included in the nursing care provided to hypertensive individuals. Keywords: Hypertension; Acupuncture Therapy; Nursing; Nursing Diagnosis. resumo Objetivos: Realizar uma análise reflexiva sobre o conhecimento produzido acerca da utilização da acupuntura como tratamento complementar à saúde de pessoas com hipertensão; e discutir as contribuições da acupuntura sobre diagnósticos de enfermagem em pessoas com hipertensão e suas implicações à prática do enfermeiro. Métodos: Reflexão teórica a partir de revisão integrativa da literatura sobre a temática nos últimos cinco anos. Resultados: Os achados foram organizados e discutidos em duas categorias que apresentam as principais evidências da prática como tratamento complementar à saúde de pessoas hipertensas e suas contribuições para o cuidado a partir da intervenção sobre diagnósticos de enfermagem. Conclusão: Existem evidências que apontam o potencial da acupuntura no tratamento complementar de saúde indicando possiblidade de sua inserção no cuidado de enfermagem a pessoas hipertensas. Palavras-chave: Hipertensão; Terapia por acupuntura; Enfermagem; Diagnóstico de Enfermagem. resumen Objetivos: Realizar un análisis reflexivo de los conocimientos producidos por el uso de la acupuntura como tratamiento complementario para la salud de las personas con hipertensión; y discutir las contribuciones de acupuntura en diagnósticos de enfermerÃa en personas con hipertensión y sus implicaciones para la práctica de enfermerÃa. Métodos: Reflexión teórica a partir de una revisión integradora de la literatura sobre el tema en los últimos cinco años. Resultados: Se organizaron los resultados en dos categorÃas que analizan las evidencias principales de la práctica como un tratamiento complementario para la salud de las personas hipertensas y sus contribuciones la intervención sobre los diagnósticos de enfermerÃa. Conclusión: Hay evidencia el potencial de la acupuntura como un tratamiento complementario de salud que indica la posibilidad de su inclusión en los cuidados de enfermerÃa para las personas hipertensas