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Results for "Derek J. Phillips"

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Simulating Emergent Properties of Human Driving Behavior Using Multi-Agent Reward Augmented Imitation LearningMar 14 2019Recent developments in multi-agent imitation learning have shown promising results for modeling the behavior of human drivers. However, it is challenging to capture emergent traffic behaviors that are observed in real-world datasets. Such behaviors arise ... More
Highly ionized Fe X-ray lines at energies 7.7-8.6 keVSep 09 2008Fe XXV lines at 1.85 A (6.70 keV) and nearby Fe XXIV satellites have been widely used for determining the temperature of the hottest parts of solar flare and tokamak plasmas, though the spectral region is crowded and the lines are blended during flare ... More
The Solar Photospheric-to-Coronal Fe abundance from X-ray Fluorescence LinesDec 23 2011The ratio of the Fe abundance in the photosphere to that in coronal flare plasmas is determined by X-ray lines within the complex at 6.7~keV (1.9~\AA) emitted during flares. The line complex includes the He-like Fe (\fexxv) resonance line $w$ (6.70~keV) ... More
Self-Organized Criticality: A Guide to Water-Protein Landscape EvolutionSep 12 2011Feb 23 2012We focus here on the scaling properties of small interspecies differences between red cone opsin transmembrane proteins, using a hydropathic elastic roughening tool previously applied to the rhodopsin rod transmembrane proteins. This tool is based on ... More
Elastic Barriers and Formation of Nanoscale Switching NetworksSep 10 2010Thin films of silicon oxide (SiOx) are mixtures of semiconductive c-Si nanoclusters (NC) embedded in an insulating g-SiO2 matrix. Tour et al. have shown that a trenched thin film geometry enables the NC to form semiconductive filamentary arrays when driven ... More
Topological Theory of Ceramic High Temperature SuperconductorsApr 30 2009May 10 2009Optimally doped ceramic superconductors (cuprates, pnictides, ...) exhibit transition temperatures Tc much larger than strongly coupled metallic superconductors like Pb (Tc= 7.2K, Eg/kTc = 4.5), and exhibit many universal features that appear to contradict ... More
Superconductive Excitations and the Infrared Vibronic Spectra of BSCCOMar 17 2004The oxygen dopant concentration dependence of the "quasiparticle" feature at 600-750 cm-1 of the infrared spectrum of Bi2Sr2CaCu2O8+delta (BSCCO), lying near and above the top of the host phonon spectrum at 600 cm-1, is strongly correlated with superconductivity. ... More
Vaccine escape in 2013-4 and the hydropathic evolution of glycoproteins of A/H3N2 virusesAug 27 2015More virulent strains of influenza virus subtypes H1N1 appeared widely in 2007 and H3N2 in 2011, and especially 2013-4, when the effectiveness of the H3N2 vaccine decreased nearly to zero. The amino acid differences of neuraminidase from prior less virulent ... More
Universal Non-Landau, Self-Organized, Lattice Disordering Percolative Dopant Network Sub-Tc Phase Transitions in Ceramic SuperconductorsMar 25 2009Ceramic superconductors (cuprates, pnictides, ...) exhibit universal features in both Tcmax and in their planar lattice disordering measured by EXAFS, as reflected by three phase transitions. The two highest temperature transitions are known to be associated ... More
Ideally Glassy Hydrogen Bonded NetworksAug 05 2005The axiomatic theory of ideally glassy networks, which has proved effective in describing phase diagrams and properties of chalcogenide and oxide glasses and their foreign interfaces, is broadened here to include intermolecular interactions in hydrogen-bonded ... More
Fermats last theorem, the Riemann hypothesis, and synergistic glassesJul 12 2003The synergistic formation of zero (exponentially small) resistance states (ESRS) in high mobility two-dimensional electron systems (2DES) in a static magnetic field B and exposed to strong microwave (MW) radiation exhibits hysteresis and an anomalous ... More
Universality of the Intermediate Phase and High-Temperature Superconductivity in C60Dec 03 2001With the discovery of Tc s over 100K, continuously biased hole-doped semiconductive C60+y has joined the family of high-temperature superconductors (HTSC) previously dominated by the ceramic cuprates. The phase diagrams of these two quite different materials ... More
Electron-Phonon Interactions Cause HTSCFeb 06 2001What is the microscopic interaction responsible for high temperature superconductivity (HTSC)? Here data on temporal relaxation of Tc and the room temperature conductivity in YBa2Cu3O(6+x) after abrupt alteration by light pulses or pressure changes are ... More
Mechanism for long-acting chimeras based on fusion with the carboxyl-terminal peptide (CTP) of human chorionic gonadotropin beta-subunit 3Oct 04 2016Thermodynamic scaling explains the dramatic successes of CTP fused human growth proteins as regards lifetime in vivo and enhanced functionality compared to their wild-type analogues, like Biogen. The theory is semi-quantitative and contains no adjustable ... More
Minimal Immunogenic Epitopes Have Nine Amino AcidsJul 22 2016To be cost-effective, biomedical proteins must be optimized with regard to many factors. Road maps are customary for large-scale projects, and here descriptive methods based on bioinformatic fractal thermodynamic scales are tested against an important ... More
Zigzag Filamentary Theory of Broken Symmetry of Neutron and Infrared Vibronic Spectra of YBa2Cu3O(6+x)Mar 07 2001Filamentary high-temperature superconductivity (HTSC) theory differs fundamentally from continuous HTSC theories because it emphasizes self-organized, discrete dopant networks and does not make the effective medium approximation (EMA). Analysis of neutron ... More
Nanodomain Structure and Function in HTSCFeb 14 2001Feb 16 2001The causes of high-temperature superconductivity (HTSC) are still mysterious, although more than 50,000 experiments have studied this subject. The most severe test of any microscopic theory is generally considered to be its ability to predict the results ... More
Verifying Public Keys without Trust: How Anonymity Can Guarantee Data IntegrityFeb 10 2016Despite the inroads that public-key cryptography has made on the web, the difficulty of key management has for the most part kept it out of the hands of the general public. With key-distribution software for PGP beginning to natively support the anonymizing ... More
Mutual information for examining correlations in DNAApr 07 2004This paper examines two methods for finding whether long-range correlations exist in DNA: a fractal measure and a mutual information technique. We evaluate the performance and implications of these methods in detail. In particular we explore their use ... More
Optimizing genetic algorithm strategies for evolving networksApr 07 2004This paper explores the use of genetic algorithms for the design of networks, where the demands on the network fluctuate in time. For varying network constraints, we find the best network using the standard genetic algorithm operators such as inversion, ... More
Over-Improved Stout-Link SmearingJan 08 2008A new over-improved stout-link smearing algorithm, designed to stabilise instanton-like objects, is presented. A method for quantifying the selection of the over-improvement parameter, $\epsilon$, is demonstrated. The new smearing algorithm is compared ... More
Aspects of QCD Vacuum StructureOct 12 2007The impact of dynamical fermions on the vacuum structure of QCD is explored. Of particular interest is the topological charge correlator, $<q(x) q(0) >$, where negative values at small $x$ reveal a sign-alternating layered structure to the topological-charge ... More
The conjugacy problem in hyperbolic groups for finite lists of group elementsNov 07 2011Nov 09 2011Let G be a word-hyperbolic group with given finite generating set, for which various standard structures and constants have been pre-computed. A (non-practical) algorithm is described that, given as input two lists A and B, each composed of m words in ... More
Generative Models for Functional Data using Phase and Amplitude SeparationDec 08 2012Dec 18 2012Constructing generative models for functional observations is an important task in statistical functional analysis. In general, functional data contains both phase (or x or horizontal) and amplitude (or y or vertical) variability. Tradi- tional methods ... More
Impact of Dynamical Fermions on QCD Vacuum StructureJan 14 2008We examine how dynamical fermions affect both the UV and infrared structure of the QCD vacuum. We consider large $28^3 \times 96$ lattices from the MILC collaboration, using a gluonic definition of the topological charge density, founded on a new over-improved ... More
C-loops: An introductionJan 24 2007C-loops are loops satisfying $x(y(yz))=((xy)y)z$. They often behave analogously to Moufang loops and they are closely related to Steiner triple systems and combinatorics. We initiate the study of C-loops by proving: (i) Steiner loops are C-loops, (ii) ... More
Rings and rigidity transitions in network glassesOct 04 2002Three elastic phases of covalent networks, (I) floppy, (II) isostatically rigid and (III) stressed-rigid have now been identified in glasses at specific degrees of cross-linking (or chemical composition) both in theory and experiments. Here we use size-increasing ... More
Linear groupoids and the associated wreath productsJan 24 2007A groupoid identity is said to be linear of length $2k$ if the same $k$ variables appear on both sides of the identity exactly once. We classify and count all varieties of groupoids defined by a single linear identity. For $k=3$, there are 14 nontrivial ... More
Modelling Alkali Line Absorption and Molecular Bands in Cool DAZsJan 05 2005Two peculiar stars showing an apparent extremely broadened and strong NaI D absorption have been discovered in surveys for cool white dwarfs by Oppenheimer et al. (2001) and Harris et al. (SDSS, 2003). We discuss the nature of these objects using PHOENIX ... More
Topological derivation of shape exponents for stretched exponential relaxationMar 03 2004Oct 01 2004In homogeneous glasses, values of the important dimensionless stretched-exponential shape parameter beta are shown to be determined by magic (not adjusted) simple fractions derived from fractal configuration spaces of effective dimension d* by applying ... More
Role of the Wilson mass parameter in the overlap Dirac topological charge densityOct 15 2009Oct 27 2009The negative Wilson mass parameter is an input parameter to the overlap Dirac operator. We examine the extent to which the topological charge density, revealed by the overlap definition, depends on the value of the negative Wilson mass. A strong dependence ... More
Survey of Multiscale and Multiphysics Applications and CommunitiesAug 31 2012May 23 2013Multiscale and multiphysics applications are now commonplace, and many researchers focus on combining existing models to construct combined multiscale models. Here we present a concise review of multiscale applications and their source communities. We ... More
The Magnetic Association of Coronal Bright PointsOct 28 1998Several coronal bright points identified in a quiet region of the Sun from SOHO/EIT Fe XII images are found to have a time evolution from birth to decay which is extremely well correlated with the rise and fall of magnetic flux as determined from photospheric ... More
Twisted cyclic theory and an index theory for the gauge invariant KMS state on Cuntz algebrasJan 30 2008Feb 29 2008This paper presents, by example, an index theory appropriate to algebras without trace. Whilst we work exclusively with the Cuntz algebras the exposition is designed to indicate how to develop a general theory. Our main result is an index theorem (formulated ... More
A New Algorithm for the Evaluation of Generalized B-splinesOct 14 2015In this paper we present a method for direct evaluation of generalized B-splines (GB-splines) via the local representation of these curves as piecewise functions. To accomplish this we introduce a local structure that makes GB-spline curves more amenable ... More
New QCD Sum Rules for In-Medium NucleonsNov 28 1995New QCD sum rules for nucleons in nuclear matter are derived from a mixed correlation function of spin-1/2 and spin-3/2 interpolating fields. These sum rules allow a determination of the scalar self-energy of the nucleon independent of the poorly known ... More
Evolution of the Ubiquitin-Activating Enzyme Uba1 (E1)Feb 22 2017Ubiquitin tags diseased proteins and initiates an enzyme conjugation cascade, which has three stages. The first-stage enzyme Uba1 (E1) has evolved only modestly from slime mold to humans, and is > 14 times larger than Ub. Here we use critical point thermodynamic ... More
Onset of rigidty in glasses: from random to self-organized networksSep 28 2006We review in this paper the signatures of a new elastic phase that is found in glasses with selected compositions. It is shown that in contrast with random networks, where rigidity percolates at a single threshold, networks that are able to self-organize ... More
A Note on Trimedial QuasigroupsJun 13 2002The purpose of this brief note is to sharpen a result of Kepka about the axiomization of the variety of trimedial quasigroups.
A Geometric Approach for Computing Tolerance Bounds for Elastic Functional DataMay 29 2018In this paper, we develop a method for constructing tolerance bounds for functional data with random warping variability. In particular, we present a general technique that is able to appropriately model both amplitude and phase variabilities. In particular, ... More
Kernel embedded nonlinear observational mappings in the variational mapping particle filterJan 29 2019Recently, some works have suggested methods to combine variational probabilistic inference with Monte Carlo sampling. One promising approach is via local optimal transport. In this approach, a gradient steepest descent method based on local optimal transport ... More
An Unbiased Survey for Outflows in the W3 and W5 Star-Formation RegionsOct 15 2001During their birth all stars undergo periods of copious mass loss, frequently characterized by the occurrence of bipolar outflows. These outflows are believed to play a fundamental role in the star formation process. However the exact outflow generating ... More
Wilson mass dependence of the overlap topological charge densityJul 06 2010Nov 04 2010The dependence of the overlap Dirac operator on the Wilson-mass regulator parameter is studied through calculations of the overlap topological charge densities at a variety of Wilson-mass values. In this formulation, the Wilson-mass is used in the negative ... More
B2 0902+34: A Collapsing Protogiant Elliptical Galaxy at z=3.4Dec 08 2008We have used the visible integral-field replicable unit spectrograph prototype (VIRUS-P), a new integral field spectrograph, to study the spatially and spectrally resolved Lyman-alpha emission line structure in the radio galaxy B2 0902+34 at z=3.4. We ... More
Characteristic polynomials in real Ginibre ensemblesOct 08 2008Nov 10 2009We calculate the average of two characteristic polynomials for the real Ginibre ensemble of asymmetric random matrices, and its chiral counterpart. Considered as quadratic forms they determine a skew-symmetric kernel from which all complex eigenvalue ... More
The double-layer structure of overscreened surfaces by smeared-out ionsSep 02 2016Charge inversion occurring for smeared-out ions is accompanied by an oscillatory charge density profile, indicating a layering of an alternating charge. The layering effect, however, is not coextensive with charge inversion, and charge inversion accompanied ... More
On the discovery of social roles in large scale social systemsSep 16 2015The social role of a participant in a social system is a label conceptualizing the circumstances under which she interacts within it. They may be used as a theoretical tool that explains why and how users participate in an online social system. Social ... More
Central extensions of loop groups and obstruction to pre-quantizationApr 13 2010Sep 20 2010An explicit construction of a pre-quantum line bundle for the moduli space of flat G-bundles over a Riemann surface is given, where G is any non-simply connected compact simple Lie group. This work helps to explain a curious coincidence previously observed ... More
A Summary of Bulk Dynamics from Quark Matter 2009Jul 28 2009Oct 06 2009I review the recent progress in measuring elliptic flow in heavy ion collisions. These measurements show clearly how hydrodynamics starts to develop as the system size is increased from peripheral to central collisions. During this transition, the momentum ... More
BiLipschitz embeddings of spheres into jet space Carnot groups not admitting Lipschitz extensionsDec 15 2017Sep 07 2018For all $k,n\ge 1$, we construct a biLipschitz embedding of $\mathbb{S}^n$ into the jet space Carnot group $J^k(\mathbb{R}^n)$ that does not admit a Lipschitz extension to $\mathbb{B}^{n+1}$. Let $f:\mathbb{B}^n\to \mathbb{R}$ be a smooth, positive function ... More
Complementary Theories of Energy Gaps in HTSCJul 25 2001We examine experiments on energy gaps in high temperature superconductors (HTSC) in terms of experimental probes that utilize momentum, position, or neither. Experiments on very high quality mechanical tunnel junctions show a sharp energy gap with a maximum ... More
Wind-Swept Clouds and Possible Triggered Star-Formation associated with the Supernova Remnant G357.7+0.3Sep 10 2009We present evidence for interaction between the supernova remnant (SNR) G357.7+0.3 and nearby molecular clouds, leading to the formation of wind-swept structures and bright emission rims. These features are not observed at visual wavelengths, but are ... More
Mean-field electrostatics beyond the point-charge descriptionNov 27 2014This review explores the number of mean-field constructions for ions whose structure goes beyond the point-charge description, a representation used in the standard Poisson-Boltzmann equation. The exploration is motivated by a body of experimental work ... More
A Generalized Poincare Inequality for a Class of Constant Coefficient Differential OperatorsOct 11 2009We study first order differential operators with constant coefficients. The main question is under what conditions a generalized Poincar\'e inequality holds. We show that the constant rank condition is sufficient. The concept of the Moore-Penrose generalized ... More
Groupoid equivariant prequantizationNov 15 2016In their 2005 paper, C. Laurent-Gengoux and P. Xu define prequantization for pre-Hamiltonian actions of quasi-presymplectic Lie groupoids in terms of central extensions of Lie groupoids. The definition requires that the quasi-presymplectic structure be ... More
The chiral Gaussian two-matrix ensemble of real asymmetric matricesNov 06 2009We solve a family of Gaussian two-matrix models with rectangular Nx(N+v) matrices, having real asymmetric matrix elements and depending on a non-Hermiticity parameter mu. Our model can be thought of as the chiral extension of the real Ginibre ensemble, ... More
Kinks, chains, and loop groups in the CP^n sigma modelsFeb 13 2009Jan 25 2010We consider topological solitons in the CP^n sigma models in two space dimensions. In particular, we study "kinks", which are independent of one coordinate up to a rotation of the target space, and "chains", which are periodic in one coordinate up to ... More
Viscous Corrections to Spectra, Elliptic Flow, and HBT RadiiSep 06 2002I compute the first viscous correction to the thermal distribution function. With this correction, I calculate the effect of viscosity on spectra, elliptic flow, and HBT radii. Indicating the breakdown of hydrodynamics, viscous corrections become of order ... More
A weighted Möbius functionMay 22 2014Sep 08 2015For a fixed odd prime $\ell$, we define a variant of the classical M\"{o}bius function on the poset of isomorphism classes of finite abelian $\ell$-groups, then we prove an analog of Hall's theorem on the vanishing of the M\"{o}bius function.
Topological energy bounds for the Skyrme and Faddeev models with massive pionsNov 11 2013A topological lower bound on the Skyrme energy which depends explicity on the pion mass is derived. This bound coincides with the previously best known bound when the pion mass vanishes, and improves on it whenever the pion mass is non-zero. The new bound ... More
Prequantization of the Moduli Space of Flat ${\rm PU}(p)$-Bundles with Prescribed Boundary HolonomiesAug 01 2014Dec 05 2014Using the framework of quasi-Hamiltonian actions, we compute the obstruction to prequantization for the moduli space of flat ${\rm PU}(p)$-bundles over a compact orientable surface with prescribed holonomies around boundary components, where $p>2$ is ... More
Dreams versus Reality: Plenary Debate Session on Quantum ComputingOct 21 2003This is a transcript of a debate on quantum computing that took place at 6:00pm, Wednesday, 4th June 2003, La Fonda Hotel, Santa Fe, USA. Transcript editor: Derek Abbott. Pro Team: Carlton M. Caves, Daniel Lidar, Howard Brandt, Alex Hamilton. Con Team: ... More
Pre-quantization of the Moduli Space of Flat G-Bundles over a SurfaceAug 09 2007Sep 29 2008For a simply connected, compact, simple Lie group G, the moduli space of flat G-bundles over a closed surface is known to be pre-quantizable at integer levels. For non-simply connected G, however, integrality of the level is not sufficient for pre-quantization, ... More
Some finite abelian group theory and some q-series identitiesMay 22 2014Jun 12 2014For a fixed odd prime $\ell$, we present new families of identities defined on various subposets of the poset of isomorphism classes of finite abelian $\ell$-groups, generalizing identities of Hall and Cohen-Lenstra. We also present a $q$-series identity. ... More
The large N limit of the Nahm transformFeb 15 2011We consider the large N limit of the Nahm transform, which relates charge N monopoles to solutions to the Nahm equation involving NxN matrices. In the large N limit the former approaches a magnetic bag, and the latter approaches a solution of the Nahm ... More
Random matrices, the Cohen-Lenstra heuristics, and roots of unityMay 23 2014The Cohen-Lenstra-Martinet heuristics predict the frequency with which a fixed finite abelian group appears as an ideal class group of an extension of number fields, for certain sets of extensions of a base field. Recently, Malle found numerical evidence ... More
Operator algebras generated by left invertiblesSep 12 2018Operator algebras generated by partial isometries and their adjoints form the basis for some of the most well studied classes of C*-algebras. Motivated by questions from linear equations in Hilbert spaces (frame theory), we instigate a research program ... More
Successive coefficients of convex functionsFeb 02 2015Mar 09 2015It is shown that for $f$ analytic and convex in $z\in D=\{z:|z|<1\}$ and given by $f(z)=z+\sum_{n=2}^{\infty}a_{n}z^{n}$, the difference of coefficients $||a_{3}|-|a_{2}||\le 25/48$ and $||a_{4}|-|a_{3}||\le 25/48$ . Both inequalities are sharp.
The double-layer structure of overscreened surfaces by smeared-out ionsSep 02 2016Nov 11 2016Charge inversion occurring for smeared-out ions is accompanied by an oscillatory charge density profile, indicating a layering of an alternating charge. The layering effect, however, is not coextensive with charge inversion, and charge inversion accompanied ... More
Ph. D. Thesis: Pre-quantization of the moduli space of flat G-bundlesApr 13 2010This thesis studies the pre-quantization of quasi-Hamiltonian group actions from a cohomological viewpoint. The compatibility of pre-quantization with symplectic reduction and the fusion product are established, and are used to understand the sufficient ... More
Hyperbolic calorons, monopoles, and instantonsMar 29 2007Sep 10 2008We construct families of SO(3)-symmetric charge 1 instantons and calorons on the space H^3 x R. We show how the calorons include instantons and hyperbolic monopoles as limiting cases. We show how Euclidean calorons are the flat space limit of this family. ... More
Chemical Freezeout in Heavy Ion CollisionsApr 08 2002We construct a hadronic equation of state consistent with chemical freezeout and discuss how such an equation of state modifies the radial and elliptic flow in a hydrodynamic + hadronic cascade model of relativistic heavy ion collisions at the SPS. Incorporating ... More
Dimension results for mappings of jet space Carnot groupsApr 24 2018We propose analogues of horizontal and vertical projections for model filiform jet space Carnot groups. Every pair consisting of the jet of a smooth function on $\mathbb{R}$ and a vertical hyperplane with first coordinate fixed provides a splitting of ... More
Results from the GMT Ground-Layer Experiment at the Magellan TelescopesJun 13 2006We present results from our two year study of ground-layer turbulence as seen through the 6.5-meter Magellan Telescopes at Las Campanas Observatory. The experiment consists of multiple, moderate resolution, Shack-Hartmann wavefront sensors deployed over ... More
Subtractive renormalization of the NN scattering amplitude at leading order in chiral effective theoryJun 08 2007Jan 23 2008The leading-order nucleon-nucleon (NN) potential derived from chiral perturbation theory consists of one-pion exchange plus a short-distance contact interaction. We show that in the 1S0 and 3S1-3D1 channels renormalization of the Lippmann-Schwinger equation ... More
Implications of $b\rightarrow sγ$ decay measurements in testing the MSSM Higgs sectorNov 17 1992The observation that the $b \rightarrow s\gamma $ decay rate is close to the Standard Model value implies a large mass for the charged-Higgs boson in the Minimum Supersymmetric Standard Model, that nearly closes the $t \rightarrow b H^+$ decay channel. ... More
When is the commutant of a Bol loop a subloop?Jan 14 2006Aug 01 2006A left Bol loop is a loop satisfying $x(y(xz)) = (x(yx))z$. The commutant of a loop is the set of elements which commute with all elements of the loop. In a finite Bol loop of odd order or of order $2k$, $k$ odd, the commutant is a subloop. We investigate ... More
A GPU implementation of a track-repeating algorithm for proton radiotherapy dose calculationsNov 09 2010An essential component in proton radiotherapy is the algorithm to calculate the radiation dose to be delivered to the patient. The most common dose algorithms are fast but they are approximate analytical approaches. However their level of accuracy is ... More
Every diassociative A-loop is MoufangJul 31 2000Aug 30 2000An A-loop is a loop in which every inner mapping is an automorphism. We settle a problem which had been open since 1956 by showing that every diassociative A-loop is Moufang.
Families of Type {\rm III KMS} States on a Class of $C^*$-Algebras containing $O_n$ and $\mathcal{Q}_\N$Jan 04 2010We construct a family of purely infinite $C^*$-algebras, $\mathcal{Q}^\lambda$ for $\lambda\in (0,1)$ that are classified by their $K$-groups. There is an action of the circle $\T$ with a unique ${\rm KMS}$ state $\psi$ on each $\mathcal{Q}^\lambda.$ ... More
Quark Singlets: Implications and ConstraintsMar 01 1995Quarks whose left- and right-handed chiral components are both singlets with respect to the SU(2) weak-isospin gauge group, offer interesting physics possibilities beyond the Standard Model (SM) already studied in many contexts. We here address some further ... More
Subtractive renormalization of the NN interaction in chiral effective theory up to next-to-next-to-leading order: S wavesMay 29 2009Oct 16 2009We extend our subtractive-renormalization method in order to evaluate the 1S0 and 3S1-3D1 NN scattering phase shifts up to next-to-next-to-leading order (NNLO) in chiral effective theory. We show that, if energy-dependent contact terms are employed in ... More
Mapping and Spectroscopy of the Planetary Nebula NGC 7009 in the Visual and InfraredAug 24 2010NGC 7009 is a fascinating example of a high excitation, elliptical planetary nebula (PN) containing circum-nebular rings, and FLIERs and jets along the major axis. We present visual spectroscopy along multiple position angles through the nucleus, taken ... More
Self-Organization and the Physics of Glassy NetworksFeb 13 2005Network glasses are the physical prototype for many self-organized systems, ranging from proteins to computer science. Conventional theories of gases, liquids, and crystals do not account for the strongly material-selective character of the glass-forming ... More
Mining Planet Search Data for Binary Stars: The $ψ^1$ Draconis systemNov 05 2015Several planet-search groups have acquired a great deal of data in the form of time-series spectra of several hundred nearby stars with time baselines of over a decade. While binary star detections are generally not the goal of these long-term monitoring ... More
C-loops: extensions and constructionsDec 19 2004C-loops are loops satisfying the identity $x(y\cdot yz) = (xy\cdot y)z$. We develop the theory of extensions of C-loops, and characterize all nuclear extensions provided the nucleus is an abelian group. C-loops with central squares have very transparent ... More
Early Recognition of Emerging Flu Strain ClustersDec 28 2015Minimizing time delays in manufacturing vaccines appropriate to rapidly mutating viruses is the key step for improving vaccine effectiveness. The vaccine for the H3N2 flu type has failed for the last two years (~ 15% effective). Here we summarize the ... More
Impact of stout-link smearing in lattice fermion actionsOct 15 2009The impact of stout-link smearing in lattice fermion actions is examined through the consideration of the mass and renormalization functions of the overlap quark propagator over a variety of smeared configurations. Up to six sweeps of stout-link smearing ... More
The structure of automorphic loopsOct 05 2012Automorphic loops are loops in which all inner mappings are automorphisms. This variety of loops includes, for instance, groups and commutative Moufang loops. We study uniquely 2-divisible automorphic loops, particularly automorphic loops of odd order, ... More
Finite Bruck LoopsJan 16 2004A loop $(X,\circ)$ is said to be a Bruck loop if it satisfies the (right) Bol identity $((z\circ x)\circ y)\circ x = z\circ ((x\circ y)\circ x)$ and the automorphic inverse property $(x\circ y)^{-1}=x^{-1}\circ y^{-1}$. If $X$ is a finite Bruck loop and ... More
F-quasigroups isotopic to groupsJan 04 2006In math.GR/0510298, we showed that every loop isotopic to an F-quasigroup is a Moufang loop. Here we characterize, via two simple identities, the class of F-quasigroups which are isotopic to groups. We call these quasigroups FG-quasigroups. We show that ... More
The Structure of F-QuasigroupsOct 14 2005Mar 16 2007We solve a problem of Belousov which has been open since 1967: to characterize the loop isotopes of F-quasigroups. We show that every F-quasigroup has a Moufang loop isotope which is a central product of its nucleus and Moufang center. We then use the ... More
Loops of Bol-Moufang type with a subgroup of index twoJun 05 2005We describe all constructions for loops of Bol-Moufang type analogous to the Chein construction $M(G,*,g_0)$ for Moufang loops.
Measuring Antimatter Gravity with MuoniumDec 10 2014The gravitational acceleration of antimatter, $\bar{g}$, has never been directly measured and could bear importantly on our understanding of gravity, the possible existence of a fifth force, and the nature and early history of the universe. Only two avenues ... More
Parameter tuning for a multi-fidelity dynamical model of the magnetosphereMar 27 2013Dec 05 2013Geomagnetic storms play a critical role in space weather physics with the potential for far reaching economic impacts including power grid outages, air traffic rerouting, satellite damage and GPS disruption. The LFM-MIX is a state-of-the-art coupled magnetospheric-ionospheric ... More
Phase-Resolved Infrared H- and K-band Spectroscopy of EF EridaniSep 29 2004We present new phase-resolved H and K-band spectroscopy of the ultra-short period magnetic cataclysmic variable EF Eri in its current, prolonged ``low'' state obtained using NIRI on Gemini-North, and NIRSPEC on Keck II. These new data show that the H-band ... More
Experimental Confirmation of the Standard Magnetorotational Instability Mechanism with a Spring-Mass AnalogueJan 10 2018Dec 12 2018The Magnetorotational Instability (MRI) has long been considered a plausibly ubiquitous mechanism to destabilize otherwise stable Keplerian flows to support radially outward transport of angular momentum. Such an efficient transport process would allow ... More
Efficient Field-Only Surface Integral Equations for ElectromagneticsJan 06 2019In a recent paper, Klaseboer et al. (IEEE Trans. Antennas Propag., vol. 65, no. 2, pp. 972-977, Feb. 2017) developed a surface integral formulation of electromagnetics that does not require working with integral equations that have singular kernels. Instead ... More
Imaging of director fields in liquid crystals using stimulated Raman scattering microscopyJan 18 2017We demonstrate an approach for background-free three-dimensional imaging of director fields in liquid crystals using stimulated Raman scattering microscopy. This imaging technique is implemented using a single femtosecond pulsed laser and a photonic crystal ... More
Computer model calibration based on image warping metrics: an application for sea ice deformationOct 15 2018Jan 24 2019Arctic sea ice plays an important role in the global climate. Sea ice models governed by physical equations have been used to simulate the state of the ice including characteristics such as ice thickness, concentration, and motion. More recent models ... More