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Proceedings, 3rd International Satellite Conference on Mathematical Methods in Physics (ICMP13): Londrina, Brazil, October 21-26, 2013
http://inspirehep.net/record/1292009
PoS ICMP2013 (2014)<br /><br /><strong>Abstract:</strong> <br />The aim of the Conference is to present the latest advances in Mathematical Methods to researchers, post-docs and graduated students acting in the areas of Physics of Particles and Fields, Mathematical Physics and Applied Mathematics. Topics: Methods of Spectral and Group Theory, Differential and Algebraic Geometry and Topology in Field Theory, Quantum Gravity, String Theory and Cosmology.Thu, 24 Apr 2014 09:35:29 GMThttp://inspirehep.net/record/1292009Proceedings, 4th International Workshop on Compound Nuclear Reactions and Related Topics (CNR*13): Maresias, Brazil, October 7-11, 2013
http://inspirehep.net/record/1292008
EPJ Web Conf. 69 (2014)<br /><br />by: Carlson, B.V.Carlson, B.V.Thu, 24 Apr 2014 08:37:25 GMThttp://inspirehep.net/record/1292008Proceedings, 1st International Workshop on Compound‐Nuclear Reactions and Related Topics (CNR*07): Yosemite, Fish Camp, California, October 22-26, 2007
http://inspirehep.net/record/1292007
AIP Conf.Proc. 1005 (2008) pp.1-247<br /><br />by: Escher, JuttaEscher, JuttaThu, 24 Apr 2014 08:30:23 GMThttp://inspirehep.net/record/1292007urn:ISBN:978-0-7354-0524-0Portrait of Gunnar Källén: A Physics Shooting Star and Poet of Early Quantum Field Theory
http://inspirehep.net/record/1292006
<br />by: Jarlskog, Cecilia<br /><strong>Abstract:</strong> <br />Wolfgang Pauli referred to him as 'my discovery,' Robert Oppenheimer described him as 'one of the most gifted theorists' and Niels Bohr found him enormously stimulating. Who was the man in question, Gunnar Källén (1926-1968)? His appearance in the physics sky was like a shooting star. His contributions to the scientific debate caused excitement among young and old. Similar to his friend and mentor, Wolfgang Pauli, he demanded honesty and rigor in physics - a distinct dividing line between fact and speculation. In his obituary, Arthur S. Wightman would write: 'Gunnar Källén was a proud continuer of the tradition in quantum field theory established by Wolfgang Pauli. His papers on quantum electrodynamics in the period 1950-1954 carried the non-perturbative approach to quantum electrodynamics forward to a point beyond which very little essential progress has been made up to the present day. At the time I was trying to puzzle out the grammar of the language of quantum field theory, and here was Källén already writing poetry in the language!'. In addition to being a remarkable scientist, Källén had a very interesting personality, well worth exploring. In her book, physicist Cecilia Jarlskog traces both the personal and scientific trajectory of this unsung hero of the early days of high-energy physics and quantum field theory. A number of invited contributions by members of the Källén family and distinguished researchers from the field, all of them personally acquainted with Källén, combine to form an authentic portrait of the researcher and the man. Last but not least, the reader will become acquainted with some aspects of the history of particle physics in those days, as related by Källén and those who corresponded with him. A commented selection of his most important and not easily accessible papers is included as an added bonus for specialists.Jarlskog, CeciliaThu, 24 Apr 2014 08:30:10 GMThttp://inspirehep.net/record/1292006urn:ISBN:978-3-319-00626-0urn:ISBN:978-3-319-00627-7Springer2014Proceedings, 1st International Conference on New Frontiers in Physics (ICNFP 2012): Kolymbari, Crete, Greece, June 10-16, 2012
http://inspirehep.net/record/1292004
EPJ Web Conf. 70 (2014)<br /><br />by: Bravina, LarissaBravina, LarissaThu, 24 Apr 2014 08:24:37 GMThttp://inspirehep.net/record/1292004Bosonization, Painleve property, exact solutions for N=1 supersymmetric mKdV equation
http://inspirehep.net/record/1292003
nlin.SIarXiv:1404.5832<br /><br />by: Ren, Bo<br /><strong>Abstract:</strong> <br />The N=1 supersymmetric modified Korteweg-de Vries (SmKdV) system is transformed to a system of coupled bosonic equations with the bosonization approach. The bosonized SmKdV (BSmKdV) passes the Painlev\'{e} test and allows a set of B\"{a}cklund transformation (BT) by truncating the series expansions of the solutions about the singularity manifold. The traveling wave solutions of the BSmKdV system are obtained using the mapping and deformation method. Some special types of exact solutions for the BSmKdV system are found with the solutions and symmetries of the usual mKdV equation. In the meanwhile, the similarity reduction solutions of the system are investigated by using the Lie point symmetry theory. The generalized tanh function expansion method for the BSmKdV system leads to a nonauto-BT theorem. Using the nonauto-BT theorem, the novel exact explicit solutions of the BSmKdV system can be obtained. All these solutions obtained via the bosonization procedure are different from those obtained via other methods.Ren, BoThu, 24 Apr 2014 08:22:16 GMThttp://inspirehep.net/record/1292003A Strongly-Interacting Dirac Liquid on the Surface of a Topological Kondo Insulator
http://inspirehep.net/record/1292002
cond-mat.mes-hallarXiv:1404.5640<br /><br />by: Efimkin, D.K.<br /><strong>Abstract:</strong> <br />A topological Kondo insulator (TKI) is a strongly-correlated material, where hybridization between the conduction electrons and localized $f$-electrons gives rise to a crossover from a metallic behavior at high temperatures to a topologically non-trivial insulating state at low temperatures. The existing description of the TKIs is based on a slave-boson mean-field theory, which neglects dynamic fluctuation phenomena. Here, we go beyond the mean-field theory and investigate the role of Kondo fluctuations on the topological surface states. We derive an effective theory of the Dirac surface states coupled to fluctuations and show that the latter mediate strong repulsive interactions between surface excitations. We show that these effects renormalize the plasmon spectrum on the surface. We also argue that Kondo-mediated interactions may drive a magnetic instability of the surface spectrum.Efimkin, D.K.Thu, 24 Apr 2014 08:22:11 GMThttp://inspirehep.net/record/1292002The Mystery of the Cosmic Diffuse Ultraviolet Background Radiation
http://inspirehep.net/record/1292001
astro-ph.GAarXiv:1404.5714<br /><br />by: Henry, Richard Conn<br /><strong>Abstract:</strong> <br />The diffuse cosmic background radiation in the GALEX far ultraviolet (FUV, 1300 - 1700 A) is deduced to originate only partially in the dust-scattered radiation of FUV-emitting stars: the source of a substantial fraction of the FUV background radiation remains a mystery. The radiation is remarkably uniform at both far northern and far southern Galactic latitudes, and it increases toward lower Galactic latitudes at all Galactic longitudes. We examine speculation that it might be due to interaction of the dark matter with the nuclei of the interstellar medium but we are unable to point to a plausible mechanism for an effective interaction. We also explore the possibility that we are seeing radiation from bright FUV-emitting stars scattering from a "second population" of interstellar grains - grains that are small compared with FUV wavelengths. Such grains are known to exist (Draine 2011) and they scatter with very high albedo, with an isotropic scattering pattern. However, comparison with the observed distribution (deduced from their 100 micron and 25 micron emission) of grains at high Galactic latitudes shows no correlation between the grains' location and the observed FUV emission. Our modeling of the FUV scattering by small grains also shows that there must be remarkably few such "smaller" grains at high Galactic latitudes, both North and South; this likely means simply that there is very little interstellar dust of any kind at the Galactic poles, in agreement with Perry and Johnston (1982).Henry, Richard ConnThu, 24 Apr 2014 08:22:07 GMThttp://inspirehep.net/record/1292001A Hybrid Advection Scheme for Conserving Angular Momentum on a Refined Cartesian Mesh
http://inspirehep.net/record/1292000
astro-ph.SRarXiv:1404.5942<br /><br />by: Byerly, Zachary D.<br /><strong>Abstract:</strong> <br />We test a new "hybrid" scheme for simulating dynamical fluid flows in which cylindrical components of the momentum are advected across a rotating Cartesian coordinate mesh. This hybrid scheme allows us to conserve angular momentum to machine precision while capitalizing on the advantages offered by a Cartesian mesh, such as a straightforward implementation of mesh refinement. Our test focuses on measuring the real and imaginary parts of the eigenfrequency of unstable axisymmetric modes that naturally arise in massless polytropic tori having a range of different aspect ratios, and quantifying the uncertainty in these measurements. Our measured eigenfrequencies show good agreement with the results obtained from the linear stability analysis of Kojima (1986) and from nonlinear hydrodynamic simulations performed on a cylindrical coordinate mesh by Woodward et al. (1994). When compared against results conducted with a traditional Cartesian advection scheme, the hybrid scheme achieves qualitative convergence at the same or, in some cases, much lower grid resolutions and conserves angular momentum to a much higher degree of precision. As a result, this hybrid scheme is much better suited for simulating astrophysical fluid flows, such as accretion disks and mass-transferring binary systems.Byerly, Zachary D.Thu, 24 Apr 2014 08:21:59 GMThttp://inspirehep.net/record/1292000On the possiblity of using vertically pointing Central Laser Facilities to calibrate the Cherenkov Telescope Array
http://inspirehep.net/record/1291999
astro-ph.IMarXiv:1404.5639<br /><br />by: Gaug, Markus<br /><strong>Abstract:</strong> <br />A Central Laser Facility is a system composed of a laser placed at a certain distance from a light-detector array, emitting fast light pulses, typically in the vertical direction, with the aim to calibrate that array. During calibration runs, all detectors are pointed towards the same portion of the laser beam at a given altitude. Central Laser Facilities are used for various currently operating ultra-high-energy cosmic ray and imaging atmospheric Cherenkov telescope arrays. In view of the future Cherenkov Telescope Array, a similar device could provide a fast calibration of the whole installation at different wavelengths. The relative precision (i.e. each individual telescope with respect to the rest of the array is expected) to be better than 5%, while an absolute calibration should reach a precisions of 4-11%, if certain design requirements are met. Additionally, a preciser monitoring of the sensitivity of each telescope can be made on time-scales of days to years.Gaug, MarkusThu, 24 Apr 2014 08:21:47 GMThttp://inspirehep.net/record/1291999Fractional Laplace Transforms - A Perspective
http://inspirehep.net/record/1291996
physics.data-anarXiv:1404.5897<br /><br />by: Treumann, R.A.<br /><strong>Abstract:</strong> <br />A form of the Laplace transform is reviewed as a paradigm for an entire class of fractional functional transforms. Various of its properties are discussed. Such transformations should be useful in application to differential/integral equations or problems in non-extensive statistical mechanics.Treumann, R.A.Thu, 24 Apr 2014 04:31:03 GMThttp://inspirehep.net/record/1291996Water isotopic ratios from a continuously melted ice core sample
http://inspirehep.net/record/1291995
physics.ins-detarXiv:1404.5760<br />Meas.Tech. 4 (2011) 2531-2542<br /><br />by: Gkinis, V.<br /><strong>Abstract:</strong> <br />A new technique for on-line high resolution isotopic analysis of liquid water, tailored for ice core studies is presented. We built an interface between a Wavelength Scanned Cavity Ring Down Spectrometer (WS-CRDS) purchased from Picarro Inc. and a Continuous Flow Analysis (CFA) system. The system offers the possibility to perform simultaneous water isotopic analysis of $\delta^{18}$O and $\delta$D on a continuous stream of liquid water as generated from a continuously melted ice rod. Injection of sub ${\mu}$l amounts of liquid water is achieved by pumping sample through a fused silica capillary and instantaneously vaporizing it with 100% efficiency in a home made oven. A calibration procedure allows for proper reporting of the data on the VSMOW--SLAP scale. Application of spectral methods yields the combined uncertainty of the system at below 0.1 permil and 0.5 permil for $\delta^{18}$O and $\delta$D, respectively. This performance is comparable to that achieved with mass spectrometry. Dispersion of the sample in the transfer lines limits the temporal resolution of the technique. By using an optimal filtering method we show how the measured profiles can be corrected for the smoothing effects resulting from the sample dispersion. Considering the significant advantages the technique offers, i.e. simultaneous measurement of $\delta^{18}$O and $\delta$D, potentially in combination with chemical components that are traditionally measured on CFA systems, notable reduction on analysis time and power consumption, we consider it as an alternative to traditional isotope ratio mass spectrometry with the possibility to be deployed for field ice core studies. We present data acquired in the field during the 2010 season as part of the NEEM deep ice core drilling project in North Greenland.Gkinis, V.Thu, 24 Apr 2014 04:31:03 GMThttp://inspirehep.net/record/1291995Temporal synchronization of GHz repetition rate electron and laser pulses for the optimization of a compact inverse-Compton scattering x-ray source
http://inspirehep.net/record/1291994
physics.acc-pharXiv:1404.5720<br /><br />by: Hadmack, Michael R.<br /><strong>Abstract:</strong> <br />The operation of an inverse-Compton scattering source of x-rays or gamma-rays requires the precision alignment and synchronization of highly focused electron bunches and laser pulses at the collision point. The arrival times of electron and laser pulses must be synchronized with picosecond precision. We have developed an RF synchronization technique that reduces the initial timing uncertainty from 350 ps to less than 2 ps, greatly reducing the parameter space to be optimized while commissioning the x-ray source. We describe the technique and present measurements of its performance.Hadmack, Michael R.Thu, 24 Apr 2014 04:31:01 GMThttp://inspirehep.net/record/1291994Analysis of the longitudinal space charge impedance of a round uniform beam inside parallel plates and rectangular chamber
http://inspirehep.net/record/1291993
physics.acc-pharXiv:1404.5637<br /><br />by: Wang, Lanfa (SLAC National Accelerator Laboratory) et al.<br /><br /><strong>Abstract:</strong> <br />This paper analyses the longitudinal space charge (LSC) impedances of a round uniform beam inside a rectangular and parallel plate chamber using image charge method. The analysis is valid for arbitrary wavelengths and the calculation converges fast. The research shows that only a few of image beams are needed to get a relative error less than 0.1%. The beam offset effect is also included.Wang, LanfaThu, 24 Apr 2014 04:31:00 GMThttp://inspirehep.net/record/1291993Self-consistent Determination of Temperature and Fluctuation Thermometer in Heavy-ion Reactions near the Fermi Energies
http://inspirehep.net/record/1291992
nucl-tharXiv:1404.5830<br /><br />by: Liu, X.<br /><strong>Abstract:</strong> <br />The density and temperature of a fragmenting system in a multifragmentation process are evaluated in a self-consistent manner using ratios between the ratio of the symmetry energy coefficient relative to the temperature, a_{sym}/T, extracted from the fragment yields generated by antisymmetrized molecular dynamics (AMD) simulations for central collisions of ^{40}Ca + ^{40}Ca at 35 MeV/nucleon. The a_{sym}/T values are extracted from all isotope yields by an improved method based on the Modified Fisher Model (MFM). The ratios of a_{sym}/T obtained, using interactions with different density dependencies of the symmetry energy term, reflect the ratios of the symmetry energy at the density of fragment formation. Using this correlation, the density is found to be \rho/\rho_0 = 0.66 \pm 0.02. The symmetry energy values for each interaction are determined at this density. With these values, temperature values are extracted as a function of isotope mass A. The extracted temperature values are compared with those evaluated from the fluctuation thermometer with a radial flow correction.Liu, X.Thu, 24 Apr 2014 04:30:20 GMThttp://inspirehep.net/record/1291992The suggested presence of the tetrahedral-symmetry in the ground-state configuration of the $^{96}$Zr nucleus
http://inspirehep.net/record/1291991
nucl-tharXiv:1404.5777<br /><br />by: Dudek, Jerzy<br /><strong>Abstract:</strong> <br />We discuss the predictions of the large scale calculations using the realistic realisation of the phenomenological nuclear mean-field theory. Calculations indicate that certain Zirconium nuclei are tetrahedral-symmetric in their ground-states. After a short overview of the research of the nuclear tetrahedral symmetry in the past we analyse the predictive capacities of the method and focus on the $^{96}$Zr nucleus expected to be tetrahedral in its ground-state.Dudek, JerzyThu, 24 Apr 2014 04:30:19 GMThttp://inspirehep.net/record/1291991Improving the accuracy of neutrino energy reconstruction in charged-current quasielastic scattering off nuclear targets
http://inspirehep.net/record/1291990
nucl-tharXiv:1404.5687<br /><br />by: Ankowski, Artur M.<br /><strong>Abstract:</strong> <br />We report the results of a theoretical study of quasielastic electron and neutrino interactions with carbon. Our approach takes into account the effects of final-state interactions between the struck nucleon and the residual nucleus, neglected in the impulse approximation, through a generalization of the spectral function formalism. The calculated electron-scattering cross sections turn out to be in very good agreement with the available data over a broad kinematical region. The impact of nuclear effects on the reconstruction of neutrino energy in charged-current quasielastic processes is also studied, and the results of our approach are compared to the predictions of the relativistic Fermi gas model, routinely employed in most Monte Carlo simulations. At energy ~600 MeV, we observe a sizable difference between neutrino and antineutrino scattering, important for the measurements of charge-parity symmetry violation. Our analysis suggests that a reliable determination of neutrino energy can only be obtained from models validated by a systematic comparison to the available electron scattering data.Ankowski, Artur M.Thu, 24 Apr 2014 04:30:18 GMThttp://inspirehep.net/record/1291990Anisotropic flow and flow fluctuations for Au + Au at $\sqrt{s_{NN}}$ = 200 GeV in a multiphase transport model
http://inspirehep.net/record/1291989
nucl-tharXiv:1404.5935<br />Phys.Rev. C89 (2014) 044907<br /><br />by: Ma, L.<br /><strong>Abstract:</strong> <br />Anisotropic flow coefficients and their fluctuations are investigated for Au+Au collisions at center of mass energy $\sqrt{s_{NN}}$ = 200 GeV by using a multi-phase transport model with string melting scenario. Experimental results of azimuthal anisotropies by means of the two- and four-particle cumulants are generally well reproduced by the model including both parton cascade and hadronic rescatterings. Event-by-event treatments of the harmonic flow coefficients $v_n$ (for n = 2, 3 and 4) are performed, in which event distributions of $v_n$ for different orders are consistent with Gaussian shapes over all centrality bins. Systematic studies on centrality, transverse momentum ($p_{T}$) and pseudo-rapidity ($\eta$) dependencies of anisotropic flows and quantitative estimations of the flow fluctuations are presented. The $p_{T}$ and $\eta$ dependencies of absolute fluctuations for both $v_2$ and $v_3$ follow similar trends as their flow coefficients. Relative fluctuation of triangular flow $v_3$ is slightly centrality-dependent, which is quite different from that of elliptic flow $v_2$. It is observed that parton cascade has a large effect on the flow fluctuations, but hadronic scatterings make little contribution to the flow fluctuations, which indicates flow fluctuations are mainly modified during partonic evolution stage.Ma, L.Thu, 24 Apr 2014 04:29:40 GMThttp://inspirehep.net/record/1291989New charge exchange model of GEANT4 for $^{9}$Be(p, n)$^{9}$B reaction
http://inspirehep.net/record/1291988
nucl-exarXiv:1404.5844<br /><br />by: Shin, Jae Won<br /><strong>Abstract:</strong> <br />Taking ENDF/B-VII.1 differential cross section data as input, a new data-based charge exchange model of GEANT4 dedicated to the $^{9}$Be(p, n)$^{9}$B reaction is developed. The resulting model turns out to be in good agreement with the experimental data for the neutron yield spectrum, making significant improvement compared to other GEANT4 hadronic models.Shin, Jae WonThu, 24 Apr 2014 04:29:40 GMThttp://inspirehep.net/record/1291988The Negative Parity Bands in $^{156}$Gd
http://inspirehep.net/record/1291987
nucl-exarXiv:1404.5794<br /><br />by: Jentschel, Michael<br /><strong>Abstract:</strong> <br />The high flux reactor of the Institut Laue-Langevin is the world most intense neutron source for research. Using the ultra high-resolution crystal spectrometers GAMS installed at the in-pile target position H6/H7 it is possible to measure nuclear state lifetimes using the Gamma Ray Induced Recoil (GRID) technique. In bent crystal mode, the spectrometers allow to perform spectroscopy with a dynamic range of up to six orders magnitude. At a very well collimated external neutron beam it is possible to install a highly efficient germanium detector array to obtain coincidences and angular correlations. The mentioned techniques were used to study the first two negative parity bands in $^{156}$Gd. These bands have been in the focus of interest since they seem to show signatures of a tetrahedral symmetry. A surprisingly high B(E2) value of about 1000 W.u. for the $4^- \rightarrow 2^-$ transition was discovered. It indicates that the two first negative parity bands cannot be considered to be signature partners.Jentschel, MichaelThu, 24 Apr 2014 04:29:39 GMThttp://inspirehep.net/record/1291987Sources of the systematic errors in measurements of Po-214 decay half-life time variations at the Baksan deep underground experiments
http://inspirehep.net/record/1291986
nucl-exarXiv:1404.5769<br /><br />by: Alexeyev, E.N.<br /><strong>Abstract:</strong> <br />The design changes of the Baksan low-background TAU-1 and TAU-2 set-ups allowed to improve a sensitivity of Po-214 half-life (\tau) measurements up to the 2.5 x 10^{-4} are described. Different possible sources of systematic errors influencing on the $\tau$-value are studed. An annual variation of Po-214 half-life time measurements with an amplitude of A=(6.9 \pm 3) x 10^{-4} and a phase of (\phi=93 \pm 10) days was found in a sequence of the week-collected \tau-values obtained from the TAU-2 data sample with total duration of 480 days. 24 hours' variation of the \tau-value measurements with an amplitude of A=(10.0 \pm 2.6) x 10^{-4} and phase of (\phi=1 \pm 0.5) hours was found in a solar day 1 hour step \tau-value sequence formed from the same data sample. It was found that the Po-214 half-life averaged at 480 days is equal to (163.45 \pm 0.04) mks.Alexeyev, E.N.Thu, 24 Apr 2014 04:29:39 GMThttp://inspirehep.net/record/1291986Latest Results from BNL and RHIC--2013
http://inspirehep.net/record/1291985
nucl-exarXiv:1404.5659<br /><br />by: Tannenbaum, M.J.<br /><strong>Abstract:</strong> <br />A selection of results from the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) from 2012 to 2013 is presented together with a few newsworthy developments in this period. The move of the g-2 magnet from BNL to Fermilab for the "fifth muon g-2 experiment" inspired a brief discussion of the original g-2 experiments at CERN. Highlights of the past year include a change in the measurement of the suppression of large transverse momentum ($p_T$) particles in the Quark Gluon Plasma to a measure of the fractional shift in the observed $p_T$ spectrum from the expected A+A spectrum for independent collisions as an estimate of the energy loss in the medium. The p+Pb run at LHC in early 2013 spurred new or improved measurements in d+Au at RHIC which included the observation of elliptical flow in d+Au collisions and measurements of transverse energy ($E_T$) spectra in p-p, d+Au and Au+Au collisions at 200 GeV nucleon-nucleon c.m. energy which demonstrated that constituent quarks are the fundamental element of particle production in all 3 systems. Measurements of identified hadrons in d+Au show a huge Cronin effect for protons but no effect for mesons. An important step for the future was the acquisition by BNL of the superconducting solenoid used in the BABAR experiment at SLAC for use in future experiments at RHIC and possibly eRHIC, starting with an upgrade of the PHENIX experiment called sPHENIX.Tannenbaum, M.J.Thu, 24 Apr 2014 04:29:38 GMThttp://inspirehep.net/record/1291985Particle-vortex and Maxwell duality in the $AdS_4\times \mathbb{CP}^3$/ABJM correspondence
http://inspirehep.net/record/1291984
hep-tharXiv:1404.5926<br /><br />by: Murugan, Jeff<br /><strong>Abstract:</strong> <br />We revisit the notion of particle-vortex duality in abelian theories of complex scalar fields coupled to gauge fields, formulating the duality as a transformation at the level of the path integral. This transformation is then made symmetric and cast as a self-duality that maps the original theory into itself with the role of particles and vortices interchanged. After defining the transformation for a pure Chern-Simons gauge theory, we show how to embed it into (a sector of) the $(2+1)-$dimensional ABJM model, and argue that this duality can be understood as being related to 4-dimensional Maxwell duality in the $AdS_{4}\times\mathbb{CP}^{3}$ bulk.Murugan, JeffThu, 24 Apr 2014 04:28:29 GMThttp://inspirehep.net/record/1291984The derivative expansion approach to the interaction between close surfaces
http://inspirehep.net/record/1291983
quant-pharXiv:1404.5911<br /><br />by: Fosco, C.D.<br /><strong>Abstract:</strong> <br />The derivative expansion approach to the calculation of the interaction between two surfaces, is a generalization of the proximity force approximation, a technique of widespread use in different areas of physics. The derivative expansion has so far been applied to seemingly unrelated problems in different areas; it is our principal aim here to present the approach in its full generality. To that end, we introduce an unified setting, which is independent of any particular application, provide a formal derivation of the derivative expansion in that general setting, and study some its properties. With a view on the possible application of the derivative expansion to other areas, like nuclear and colloidal physics, we also discuss the relation between the derivative expansion and some time-honoured uncontrolled approximations used in those contexts. By putting them under similar terms as the derivative expansion, we believe that the path is open to the calculation of next to leading order corrections also for those contexts. We also review some results obtained within the derivative expansion, by applying it to different concrete examples and highlighting some important points.Fosco, C.D.Thu, 24 Apr 2014 04:28:29 GMThttp://inspirehep.net/record/1291983Generalized bootstrap equations for N=4 SCFT
http://inspirehep.net/record/1291982
hep-tharXiv:1404.5864<br /><br />by: Alday, Luis F.<br /><strong>Abstract:</strong> <br />We study the consistency of four-point functions of half-BPS chiral primary operators of weight p in four-dimensional N=4 superconformal field theories. The resulting conformal bootstrap equations impose non-trivial bounds for the scaling dimension of unprotected local operators transforming in various representations of the R-symmetry group. These bounds generalize recent bounds for operators in the singlet representation, arising from consistency of the four-point function of the stress-energy tensor multiplet.Alday, Luis F.Thu, 24 Apr 2014 04:28:29 GMThttp://inspirehep.net/record/1291982