29 research outputs found
Counting Domain Walls in N=1 Super Yang-Mills Theory
We study the multiplicity of BPS domain walls in N=1 super Yang-Mills theory,
by passing to a weakly coupled Higgs phase through the addition of fundamental
matter. The number of domain walls connecting two specified vacuum states is
then determined via the Witten index of the induced worldvolume theory, which
is invariant under the deformation to the Higgs phase. The worldvolume theory
is a sigma model with a Grassmanian target space which arises as the coset
associated with the global symmetries broken by the wall solution. Imposing a
suitable infrared regulator, the result is found to agree with recent work of
Acharya and Vafa in which the walls were realized as wrapped D4-branes in IIA
string theory.Comment: 28 pages, RevTeX, 3 figures; v2: discussion of the index slightly
expanded, using an alternative regulator, and references added; v3: typos
corrected, to appear in Phys. Rev.
A Note on Domain Walls and the Parameter Space of N=1 Gauge Theories
We study the spectrum of BPS domain walls within the parameter space of N=1
U(N) gauge theories with adjoint matter and a cubic superpotential. Using a low
energy description obtained by compactifying the theory on R^3 x S^1, we
examine the wall spectrum by combining direct calculations at special points in
the parameter space with insight drawn from the leading order potential between
minimal walls, i.e those interpolating between adjacent vacua. We show that the
multiplicity of composite BPS walls -- as characterised by the CFIV index --
exhibits discontinuities on marginal stability curves within the parameter
space of the maximally confining branch. The structure of these marginal
stability curves for large N appears tied to certain singularities within the
matrix model description of the confining vacua.Comment: 33 pages, LaTeX, 6 eps figures; v2: references adde
Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in âs = 7 TeV pp collisions with the ATLAS detector
A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fbâ1 of protonâproton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results
Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC
Measurements of inclusive jet suppression in heavy ion collisions at the LHC
provide direct sensitivity to the physics of jet quenching. In a sample of
lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated
luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with
a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the
transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the
anti-kt algorithm with values for the distance parameter that determines the
nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of
the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp.
Jet production is found to be suppressed by approximately a factor of two in
the 10% most central collisions relative to peripheral collisions. Rcp varies
smoothly with centrality as characterized by the number of participating
nucleons. The observed suppression is only weakly dependent on jet radius and
transverse momentum. These results provide the first direct measurement of
inclusive jet suppression in heavy ion collisions and complement previous
measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables,
submitted to Physics Letters B. All figures including auxiliary figures are
available at
http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02
Relativistic Laser-Matter Interaction and Relativistic Laboratory Astrophysics
The paper is devoted to the prospects of using the laser radiation
interaction with plasmas in the laboratory relativistic astrophysics context.
We discuss the dimensionless parameters characterizing the processes in the
laser and astrophysical plasmas and emphasize a similarity between the laser
and astrophysical plasmas in the ultrarelativistic energy limit. In particular,
we address basic mechanisms of the charged particle acceleration, the
collisionless shock wave and magnetic reconnection and vortex dynamics
properties relevant to the problem of ultrarelativistic particle acceleration.Comment: 58 pages, 19 figure
Polymorphism: an evaluation of the potential risk to the quality of drug products from the FarmĂĄcia Popular Rede PrĂłpria
High frequency radio waves â An innovative approach to the correction of age-related skin changes: Clinical and immunohistochemical research
The aim of investigation was to evaluate the efficiency of high frequency radio wave exposure (4.0 MHz) for the correction of age-related changes of facial skin by studying aspects of its regeneration, on the basis of morphological and immunohistochemical characteristics. Materials and Methods. The study consisted of two parts. The clinical part included an analysis of the results of high frequency radio wave facial rejuvenation (4.0 MHz) (5 procedures: on days 1, 30, 60, and months 6, 12). Immunohistochemical investigation was performed on repeated punch-biopsy specimens of the skin behind the ear, before the exposure, and at 30, 60, 180 and 360 days after a single exposure. Collagen of types 1 and 3, elastin, Ki-67, CD34, SMA, MMP2 and TIMP1 were identified. Results. It was found that the most evident morphological changes after high frequency radio wave exposure occurred in the deeper dermis layers and in the adjacent adipose tissue. Such remodeling of the extracellular matrix of the dermis causes an expansion of the deep dermis layers with the accumulation of collagen of types 1 and 3 with a greater proportional increase in favor of type 1. The key anti-ageing factor of radio wave exposure is considered to be the activation of neoangiogenesis in the dermis, which occurs gradually, reaching its maximum by month 12 after a single exposure. © 2016, Nizhny Novgorod State Medical Academy. All rights reserved
High frequency radio waves â An innovative approach to the correction of age-related skin changes: Clinical and immunohistochemical research
The aim of investigation was to evaluate the efficiency of high frequency radio wave exposure (4.0 MHz) for the correction of age-related changes of facial skin by studying aspects of its regeneration, on the basis of morphological and immunohistochemical characteristics. Materials and Methods. The study consisted of two parts. The clinical part included an analysis of the results of high frequency radio wave facial rejuvenation (4.0 MHz) (5 procedures: on days 1, 30, 60, and months 6, 12). Immunohistochemical investigation was performed on repeated punch-biopsy specimens of the skin behind the ear, before the exposure, and at 30, 60, 180 and 360 days after a single exposure. Collagen of types 1 and 3, elastin, Ki-67, CD34, SMA, MMP2 and TIMP1 were identified. Results. It was found that the most evident morphological changes after high frequency radio wave exposure occurred in the deeper dermis layers and in the adjacent adipose tissue. Such remodeling of the extracellular matrix of the dermis causes an expansion of the deep dermis layers with the accumulation of collagen of types 1 and 3 with a greater proportional increase in favor of type 1. The key anti-ageing factor of radio wave exposure is considered to be the activation of neoangiogenesis in the dermis, which occurs gradually, reaching its maximum by month 12 after a single exposure. © 2016, Nizhny Novgorod State Medical Academy. All rights reserved