Results for "John Hagopian"

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Search for Supersymmetry and Leptoquark States at FNALOct 04 1994Oct 10 1994Searches have been made for first generation scalar and vector leptoquarks by the D0 collaboration and for second generation scalar leptoquarks by the CDF collaboration. Lower leptoquark mass limits were set. A search for squarks and gluinos, predicted ... More
High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront controlMar 13 2019Segmented telescopes are a possibility to enable large-aperture space telescopes for the direct imaging and spectroscopy of habitable worlds. However, the complexity of their aperture geometry, due to the central obstruction, support structures and segment ... More
Optimal Bacon-Shor codesSep 04 2012We study the performance of Bacon-Shor codes, quantum subsystem codes which are well suited for applications to fault-tolerant quantum memory because the error syndrome can be extracted by performing two-qubit measurements. Assuming independent noise, ... More
Saddlepoint approximations for likelihood ratio like statistics with applications to permutation testsMar 14 2012We obtain two theorems extending the use of a saddlepoint approximation to multiparameter problems for likelihood ratio-like statistics which allow their use in permutation and rank tests and could be used in bootstrap approximations. In the first, we ... More
Computing power series expansions of modular formsApr 30 2012Sep 30 2012We exhibit a method to numerically compute power series expansions of modular forms on a cocompact Fuchsian group, using the explicit computation a fundamental domain and linear algebra.
TASI-2002 Lectures: Non-perturbative SupersymmetryJun 12 2003Sep 30 2003These lectures contain a pedagogical review of non-perturbative results from holomorphy and Seiberg duality with applications to dynamical SUSY breaking. Background material on anomalies, instantons, unitarity bounds from superconformal symmetry, and ... More
Some thoughts on dynamic effective properties -- a working documentNov 05 2013The main purpose of this work is to address the question of the utility of "effective constitutive relations" for problems in dynamics. This is done in the context of longitudinal shear waves in an elastic medium that is periodically laminated, with attention ... More
Green's function for longitudinal shear of a periodic laminateNov 05 2013The reasoning is a slight extension of that employed in my article [1] and its further development [2]. A formal solution to the title problem is presented for a general periodic laminate and its application for the construction of "effective constitutive ... More
Linking Numbers and the Tame Fontaine-Mazur ConjectureAug 27 2013Let p be an odd prime, let S be a finite set of primes q congruent to 1 mod p but not mod p^2 and let G_S be the Galois group of the maximal p-extension of Q un-ramified outside of S. If r is a continuous homomorphism of G_S into GL_2(Z_p) then under ... More
A supersymmetric version of the quark model, and supersymmetry breaking for the Leptons, Baryons and Hadronic Mesons: Cybersusy VAug 27 2008Mar 14 2009Cybersusy is a new mechanism for supersymmetry breaking in the standard supersymmetric model (SSM). Here we note that the superpotential for the SSM has a set of thirteen invariances, five of which are well known, and eight of which are new. The eight ... More
Kinematical signatures of hidden stellar discsFeb 02 1999The deprojection of the surface brightness distribution of an axisymmetric galaxy does not have a unique solution unless the galaxy is viewed precisely edge-on. I present an algorithm that finds the full range of smooth axisymmetric density distributions ... More
Bundles of spectra and algebraic K-theoryApr 20 2013Jan 07 2015A parametrized spectrum E is a family of spectra E_x continuously parametrized by the points x of a topological space X. We take the point of view that a parametrized spectrum is a bundle-theoretic geometric object. When R is a ring spectrum, we consider ... More
QCD at the Tevatron: Status and ProspectsDec 22 2000Jan 01 2001I shall review the present status of Tevatron QCD studies, focusing on the production of jets, vector bosons, photons and heavy quarks. In general there is good agreement between the results of current calculational tools and the experimental data. The ... More
Strong & Weak Methods: A Logical View of UncertaintyMar 27 2013The last few years has seen a growing debate about techniques for managing uncertainty in AI systems. Unfortunately this debate has been cast as a rivalry between AI methods and classical probability based ones. Three arguments for extending the probability ... More
On the construction of globular weak omega-groupoids from types, topological spaces etcFeb 25 2016Nov 07 2016A short introduction to Grothendieck weak omega-groupoids is given. Our aim is to give evidence that, in certain contexts, this simple language is a convenient one for constructing globular weak omega-groupoids. To this end, we give a short reworking ... More
An examination of proton charge radius extractions from e-p scattering dataJun 02 2015A detailed examination of issues associated with proton radius extractions from elastic electron-proton scattering experiments is presented. Sources of systematic uncertainty and model dependence in the extractions are discussed, with an emphasis on how ... More
Two-photon exchange measurements with positrons and electronsMay 05 2009Two-photon exchange contributions have potentially broad ranging impact on several charged lepton scattering measurements. Previously believed to be extremely small, based in part on comparisons of positron scattering and electron scattering in the 1950s ... More
Surface Brightness Fluctuations as Primary and Secondary Distance IndicatorsFeb 02 2012The surface brightness fluctuations (SBF) method measures the variance in a galaxy's light distribution arising from fluctuations in the numbers and luminosities of individual stars per resolution element. Once calibrated for stellar population effects, ... More
New Common Proper Motion Pairs Containing White Dwarfs from SDSS DataMar 12 2010Mar 30 2012Spectroscopically identified white dwarfs from the SDSS data release 1 are matched against SDSS data release 1 proper motion survey in the search for common proper motion companions
How many sigmas is the solar neutrino effect?Aug 17 2001Sep 03 2001The minimal standard electroweak model can be tested by allowing all the solar neutrino fluxes, with undistorted energy spectra, to be free parameters in fitting the measured solar neutrino event rates, subject only to the condition that the total observed ... More
Summary Talk: International Symposium on Neutrino Astrophysics, Takayama/Kamioka (10/'92)Dec 14 1992Contents: 1. The Conference 2. Solar Neutrinos -A. Operating Experiments -B. New Funded Experiments -C. Are Solar Neutrino Fluxes Time Dependent? -D. Have $pp$ Neutrinos Been Detected? -E. Is Directionality Required for Astronomical Observations? -F. ... More
The Elliptical-Spheroidal and Elliptical-Elliptical Galaxy DichotomiesDec 03 2008This paper summarizes Kormendy et al. (2009, ApJS, in press, arXiv:0810.1681). We confirm that spheroidal galaxies have fundamental plane correlations that are almost perpendicular to those for bulges and ellipticals. Spheroidals are not dwarf ellipticals. ... More
Secular Evolution in Disk GalaxiesNov 11 2013Self-gravitating systems evolve toward the most tightly bound configuration that is reachable via available evolution processes. The inner parts shrink and the outer parts expand, provided that some physical process transports energy or angular momentum ... More
The Stellar-Dynamical Search for Supermassive Black Holes in Galactic NucleiJun 18 2003The robustness of stellar-dynamical black hole (BH) mass measurements is illustrated using 7 galaxies that have results from independent groups. Derived masses have remained constant to a factor of about 2 as spatial resolution has improved by factors ... More
Maximizing $H$-colorings of connected graphs with fixed minimum degreeJan 19 2016For graphs $G$ and $H$, an $H$-coloring of $G$ is a map from the vertices of $G$ to the vertices of $H$ that preserves edge adjacency. We consider the following extremal enumerative question: for a given $H$, which connected $n$-vertex graph with minimum ... More
Exponential Lower Bounds For Policy IterationMar 17 2010We study policy iteration for infinite-horizon Markov decision processes. It has recently been shown policy iteration style algorithms have exponential lower bounds in a two player game setting. We extend these lower bounds to Markov decision processes ... More
Tight Contact Structures on Lens SpacesDec 10 1998May 18 2000In this paper we develop a method for studying tight contact structures on lens spaces. We then derive uniqueness and non-existence statements for tight contact structures with certain (half) Euler classes on lens spaces. We also prove that any lens space ... More
Network GravityFeb 12 2016Jul 08 2016We introduce the construction of a new framework for probing discrete emergent geometry and boundary-boundary observables based on a fundamentally a-dimensional underlying network structure. Using a gravitationally motivated action with Forman weighted ... More
Modelling catastrophic risk in international equity markets: An extreme value approachMar 29 2011This letter uses the Block Maxima Extreme Value approach to quantify catastrophic risk in international equity markets. Risk measures are generated from a set threshold of the distribution of returns that avoids the pitfall of using absolute returns for ... More
Remark About Heat Diffusion on Periodic SpacesJul 18 1997Let M be a complete Riemannian manifold with a free cocompact Z^k-action. Let k(t,x,y) be the heat kernel on M. We compute the asymptotics of k(t,x,y) in the limit in which t goes to infinity and d(x,y) is comparable to sqrt{t}. We show that in this limit, ... More
Secondary analytic indicesMar 13 1995We define analytic indices which involve the eta form and the analytic torsion form. We show that these indices are independent of the geometric choices made in their definitions, and hence are topological in nature.
Ball Lightning and Plasma CohesionFeb 19 2003The phenomenon of ball lightning has been observed for a long time, but the nature of these luminous balls has been unknown. It is proposed here that they consist of highy excited Rydberg atoms with large polarizabilities that bind them together. Thus ... More
Notes on Measure and IntegrationFeb 27 2008Aug 10 2009This text grew out of notes I have used in teaching a one quarter course on integration at the advanced undergraduate level. My intent is to introduce the Lebesgue integral in a quick, and hopefully painless, way and then go on to investigate the standard ... More
Quantum theory is classical mechanics with non-local existenceDec 13 2009I propose a new and direct connection between classical mechanics and quantum mechanics where I derive the quantum mechanical propagator from a variational principle. This variational principle is Hamilton's modified principle generalized to allow many ... More
A generalized form of Hamilton's principleMay 27 2005May 27 2005Many quantization schemes rely on analogs of classical mechanics where the connections with classical mechanics are indirect. In this work I propose a new and direct connection between classical mechanics and quantum mechanics where the quantum mechanical ... More
Overview of the Orion ComplexNov 29 2008The Orion star formation complex is the nearest region of on-going star formation that continues to produce both low and high mass stars. Orion is discussed in the larger context of star formation in the Solar vicinity over the last 100 Myr. The Orion ... More
Hidden Markov models for stochastic thermodynamicsApr 01 2015Apr 29 2015The formalism of state estimation and hidden Markov models (HMMs) can simplify and clarify the discussion of stochastic thermodynamics in the presence of feedback and measurement errors. After reviewing the basic formalism, we use it to shed light on ... More
The category of categories with pullbacks is cartesian closedApr 16 2009We show that the category of categories with pullbacks and pullback preserving functors is cartesian closed.
Homogeneous studies of transiting extrasolar planets. V. New results for 38 planetsJul 24 2012I measure the physical properties of 38 transiting extrasolar planetary systems, bringing the total number studied within the Homogeneous Studies project to 82. Transit light curves are modelled using JKTEBOP, with careful attention paid to limb darkening, ... More
Mass loss and supernova progenitorsNov 16 2007We first discuss the mass range of type IIP SN progenitors and how the upper and lower limits impose interesting constraints on stellar evolution. Then we discuss the possible implications of two SNe, 2002ap and 2006jc, for Wolf-Rayet star mass-loss rates ... More
A closed orientable 3-manifold with distinct distance three genus two Heegaard splittingsDec 07 2009We describe an example of a closed orientable 3-manifold with distinct distance three genus two Heegaard splittings. This demonstrates that the constructions of alternate genus two Heegaard splittings of closed orientable 3-manifolds described by Rubinstein ... More
A classification of pairs of disjoint nonparallel primitives in the boundary of a genus two handlebodyOct 16 2009Embeddings of pairs of disjoint nonparallel primitive simple closed curves in the boundary of a genus two handlebody are classified. Briefly, two disjoint primitives either lie on opposite ends of a product $F \boldsymbol{\times} I$, or they lie on opposite ... More
Logarithmic conformal field theories as limits of ordinary CFTs and some physical applicationsFeb 18 2013Mar 05 2013We describe an approach to logarithmic conformal field theories as limits of sequences of ordinary conformal field theories with varying central charge c. Logarithmic behaviour arises from degeneracies in the spectrum of scaling dimensions at certain ... More
Compact Neutrino SourceMay 15 2015Some evidence for sterile neutrinos has been found in short baseline observations where the measured neutrino flux did not agree with expectations. Systematic uncertainties from the expected values has limited the sensitivity of this approach. Observation ... More
The SN 1987A Link to Gamma-Ray BurstsMay 25 2007Jun 29 2007Early measurements of SN 1987A indicate a beam/jet (BJ) which hit polar ejecta (PE) to produce the "Mystery Spot" (MS). The SN flash takes an extra 8 d to hit the MS, and this was confirmed at 2e39 ergs/s in the optical at day 8. A ramp in luminosity ... More
A note on the real coarse Baum-Connes conjectureAug 12 2013We document some versions, in real K-theory, of well-known properties of the coarse assembly map in complex K-theory. These results are well-known, but difficult to find in the literature.
Bubble Wall Profiles With More Than One Scalar Field: A Numerical ApproachOct 27 1998Jan 31 1999We present a general numerical approach to solve the equations for bubble wall profiles in models with more than one scalar field and CP violating phases. We discuss the algorithm as well as several problems associated with it and show some profiles for ... More
I've Got the World on a BraneNov 28 2011This thesis treats several topics in the study of extra-dimensional models of the world, concerning Heterotic M-Theory and the dynamics of branes. We describe a reduction to five dimensions, over a Calabi-Yau manifold, of an improved version of Heterotic ... More
Quantum Stratonovich Stochastic Calculus and the Quantum Wong-Zakai TheoremNov 13 2005May 03 2006We extend the Ito -to- Stratonovich analysis or quantum stochastic differential equations, introduced by Gardiner and Collett for emission (creation), absorption (annihilation) processes, to include scattering (conservation) processes. Working within ... More
Quantum Statistical Field Theory and CombinatoricsNov 24 2003Mar 06 2005This is a set of review notes on combinatorial aspects of Bosonic quantum field theory. We collect together several related issues concerning moments of distributions, moments of stochastic processes and Ito's formula, and Green's functions and cumulant ... More
Quantum White Noises and The Master Equation for Gaussian Reference StatesSep 12 2003We show that a basic quantum white noise process formally reproduces quantum stochastic calculus when the appropriate normal / chronological orderings are prescribed. By normal ordering techniques for integral equations and a generalization of the Araki-Woods ... More
Filtering of Wide Sense Stationary Quantum Stochastic ProcessesAug 06 2007We introduce a concept of a quantum wide sense stationary process taking values in a C*-algebra and expected in a sub-algebra. The power spectrum of such a process is defined, in analogy to classical theory, as a positive measure on frequency space taking ... More
Quantum Stochastic GeneratorsSep 12 2003Nov 06 2005We discuss stochastic derivations, stochastic Hamiltonians and the flows that they generate, algebraic fluctuaion-dissipation theorems, etc., in a language common to both classical and quantum algebras. It is convenient to define distinct notions of time-ordered ... More
Quantum Flows as Markovian Limit of Emission, Absorption and Scattering InteractionsSep 05 2003Nov 18 2006We consider a Markovian approximation, of weak coupling type, to an open system perturbation involving emission, absorption and scattering by reservoir quanta. The result is the general form for a quantum stochastic flow driven by creation, annihilation ... More
The Effect of Dissipation on the Shapes of Dark halosAug 31 1993The dissipative infall of gas during the formation of a galaxy modifies the density profile and shape of the dark halo. Gas dissipates energy radiatively and sinks to the center of the dark halo forming the luminous part of a galaxy. The resulting central ... More
Structure and Evolution of Dwarf GalaxiesMay 06 2014Different structural parameter correlations show how classical bulge components and elliptical galaxies are different from spiral and S0 galaxy disks, irregular (Im) galaxies, and spheroidal (Sph) galaxies. In contrast, the latter, apparently diverse ... More
The Approachability Ideal Without a Maximal SetJul 16 2016Jul 19 2016We develop a forcing poset with finite conditions which adds a partial square sequence on a given stationary set, with adequate sets of models as side conditions. We then develop a kind of side condition product forcing for simultaneously adding partial ... More
Non-Thermal Dark Matter, High Energy Cosmic Rays and Late-Decaying Particles From Inflationary Quantum FluctuationsNov 16 2000May 23 2001It has been suggested that the origin of cosmic rays above the GZK limit might be explained by the decay of particles, X, with mass of the order of 10^{12} GeV. Generation of heavy particles from inflationary quantum fluctuations is a prime candidate ... More
Dynamical Cosmological Constant from A Very Recent Phase TransitionJul 12 2000Nov 19 2000Observation indicates that the expansion of the Universe is accelerating and favours a dynamical cosmological constant, \Lambda(t). We consider the possibility that this is due to a scalar field which has undergone a very recent phase transition. We study ... More
Negative Running of the Spectral Index, Hemispherical Asymmetry and the Consistency of Planck with Large $r$Mar 26 2014Oct 24 2014Planck favours a negative running of the spectral index, with the likelihood being dominated by low multipoles $l \lesssim 50$ and no preference for running at higher $l$. A negative spectral index is also necessary for the 2-$\sigma$ Planck upper bound ... More
Baryomorphosis: Relating the Baryon Asymmetry to the "WIMP Miracle"Sep 16 2010Apr 06 2011We present a generic framework, "baryomorphosis", which modifies the baryon asymmetry to be naturally of the order of a typical thermal relic WIMP density. We consider a simple scalar-based model to show how this is possible. This model introduces a sector ... More
Enhanced Dark Matter Annihilation Rate for Positron and Electron Excesses from Q-ball DecayApr 06 2009Sep 25 2009We show that Q-ball decay in Affleck-Dine baryogenesis models can account for dark matter when the annihilation cross-section is sufficiently enhanced to explain the positron and electron excesses observed by PAMELA, ATIC and PPB-BETS. For Affleck-Dine ... More
Cosmological Constraints on Unparticles as Continuous Mass ScalarsSep 14 2007Mar 13 2009We study the cosmological constraints on unparticle interactions and the temperature of the Universe for the case where unparticle states can be modelled as continuous mass particles with lifetime > 1s. By considering thermal background quark decay to ... More
Naturally Large Cosmological Neutrino Asymmetries in the MSSMAug 09 1999May 11 2000A large neutrino asymmetry is an interesting possibility for cosmology, which can have significant observable consequences for nucleosynthesis and the cosmic microwave background. However, although it is a possibility, there is no obvious reason to expect ... More
Spontaneous Discrete Symmetry Breaking During Inflation and the NMSSM Domain Wall ProblemSep 30 1997Apr 02 1998The Next to Minimal Supersymmetric Standard Model (NMSSM), proposed as a solution of the mu problem of the Minimal Supersymmetric Standard Model, has a discrete Z_{3} symmetry which is spontaneously broken at the electroweak phase transition, resulting ... More
Nucleosynthesis bounds on small Dirac neutrino masses due to chiral symmetry breakingOct 10 1996Nov 19 1996We consider nucleosynthesis constraints on models which use chiral symmetry breaking as a basis for understanding very small Dirac neutrino masses. We show that present big-bang nucleosynthesis constraints impose a well-defined upper bound of 0.1eV on ... More
Effective cycles on blow-ups of GrassmanniansDec 06 2016In this paper we study the pseudoeffective cones of blow-ups of Grassmannians at sets of points. For small numbers of points, the cones are often spanned by proper transforms of Schubert classes. In some special cases, we provide sharp bounds for when ... More
The DEBCat detached eclipsing binary catalogueNov 05 2014Detached eclipsing binary star systems are our primary source of measured physical properties of normal stars. I introduce DEBCat: a catalogue of detached eclipsing binaries with mass and radius measurements to the 2% precision necessary to put useful ... More
Boundary Measurement Matrices for Directed Networks on SurfacesSep 23 2016Franco, Galloni, Penante, and Wen have proposed a boundary measurement map for a graph on any closed orientable surface with boundary. We consider this boundary measurement map which takes as input an edge weighted directed graph embedded on a surface ... More
Measurements of the W Boson Mass and Trilinear Gauge Boson Couplings at the TevatronJun 05 1998We present measurements of the W boson mass at the Tevatron based on $W \to \mu \nu$ events collected by CDF and $W \to e \nu$ events observed by D0 in Run Ib (1994--95). The W boson mass measured in the preliminary CDF analysis is 80.43 \pm 0.10 (stat) ... More
Today's View on StrangenessNov 29 2004There are several different experimental indications, such as the pion-nucleon sigma term and polarized deep-inelastic scattering, which suggest that the nucleon wave function contains a hidden s bar s component. This is expected in chiral soliton models, ... More
Theoretical Introduction to Physics with Linear CollidersSep 13 2004The major open questions in particle physics are summarized, as are the abilities of linear colliders of different energies to add to the knowledge obtainable from the LHC in various scenarios for physics beyond the Standard Model. A TeV linear collider ... More
Learning Physics from the Cosmic Microwave BackgroundFeb 17 1999The Cosmic Microwave Background (CMB) provides a precious window on fundamental physics at very high energy scales, possibly including quantum gravity, GUTs and supersymmetry. The CMB has already enabled defect-based rivals to inflation to be discarded, ... More
Hunting Down Interpretations of the HERA Large-Q^2 dataDec 11 1997Possible interpretations of the HERA large-Q^2 data are reviewed briefly. The possibility of statistical fluctuations cannot be ruled out, and it seems premature to argue that the H1 and ZEUS anomalies are incompatible. The data cannot be explained away ... More
Phenomenology of LEP 2 PhysicsJul 23 1997Various aspects of physics at LEP 2 are reviewed from a phenomenological point of view. We first discuss the search for Higgs bosons, which might be relatively light if indications from the precision electroweak data and supersymmetry are correct. Then ... More
The Beautiful Physics of LHC Run 2Dec 08 2014Run 2 of the LHC offers some beautiful prospects for new physics, including flavour physics as well as more detailed studies of the Higgs boson and searches for new physics beyond the Standard Model (BSM). One of the possibilities for BSM physics is supersymmetry, ... More
Outlook from SUSY07Oct 25 2007Make-or-break time is near for the Higgs boson and supersymmetry. The LHC will soon put to the sword many theoretical ideas, and define the future for collider physics.
Sneutrino InflationMar 23 2004The seesaw model of neutrinos might explain the size, age, flatness and near-homogeneity of the Universe via sneutrino inflation, as well as explaining the origin of matter via leptogenesis. The sneutrino inflation hypothesis makes specific, testable ... More
Particle Physics and CosmologyMay 02 2003In the first Lecture, the Big Bang and the Standard Model of particle physics are introduced, as well as the structure of the latter and open issues beyond it. Neutrino physics is discussed in the second Lecture, with emphasis on models for neutrino masses ... More
Limits of the Standard ModelNov 12 2002Supersymmetry is one of the most plausible extensions of the Standard Model, since it is well motivated by the hierarchy problem, supported by measurements of the gauge coupling strengths, consistent with the suggestion from precision electroweak data ... More
Neutrino Physics: Theory and PhenomenologyJul 22 1999Various issues in neutrino phenomenology are reviewed, including: the possibility of large mixing angles in various models for neutrino masses, difficulties for degenerate neutrinos as candidates for hot dark matter, strategies for discriminating between ... More
Outlook on Neutrino PhysicsNov 29 1996Some of the hot topics in neutrino physics are discussed, with particular emphasis on neutrino oscillations. After proposing credibility criteria for assessing various claimed effects, particular stress is laid on the solar neutrino deficit, which seems ... More
Tambara Functors and Commutative Ring SpectraApr 17 2013May 22 2013It is well known that the zeroth stable homotopy group of a genuine equivariant commutative ring spectrum has multiplicative transfers (norms), making it into a Tambara functor. We prove here that all Tambara functors can be obtained in this way. In fact, ... More
Cluster automorphisms and the marked exchange graphs of skew-symmetrizable cluster algebrasFeb 17 2016Cluster automorphisms have been shown to have links to the mapping class groups of surfaces, maximal green sequences and to exchange graph automorphisms for skew-symmetric cluster algebras. In this paper we aim to generalise these results to the skew-symmetrizable ... More
Energy exchange in Weyl geometryJan 23 2013We study homogeneous and isotropic cosmologies in a Weyl spacetime. We show that the field equations can be reduced to the Einstein equations with a two-fluid source and analyze the qualitative, asymptotic behavior of the models. Assuming an interaction ... More
Isotropic cosmologies in Weyl geometryFeb 09 2004We study homogeneous and isotropic cosmologies in a Weyl spacetime. We show that for homogeneous and isotropic spacetimes, the field equations can be reduced to the Einstein equations with a two-fluid source. We write the equations as a two-dimensional ... More
A note on implementations of the Boosting Algorithm and Heterogeneous Multiscale MethodsSep 04 2015We present improved convergence results for the Boosting Algorithm (BA), and demonstrate that an existing formulation of the Heterogeneous Multiscale Methods (HMM) is accurate to first order only in the macro time step, regardless of the order of the ... More
Giant number fluctuations in dry active polar fluids: A shocking analogy with lightning rodsDec 11 2018The hydrodynamic equations of dry active polar fluids (i.e., moving flocks without momentum conservation) are shown to imply giant number fluctuations. Specifically, the rms fluctuations $\sqrt {<(\delta N)^2>}$ of the number $N$ of active particles in ... More
Simulating quantum field theory with a quantum computerNov 25 2018Forthcoming exascale digital computers will further advance our knowledge of quantum chromodynamics, but formidable challenges will remain. In particular, Euclidean Monte Carlo methods are not well suited for studying real-time evolution in hadronic collisions, ... More
Does String Theory Have a Duality Symmetry Relating Weak and Strong Coupling?Jul 19 1993The heterotic string theory, compactified to four dimensions, has been conjectured to have a duality symmetry (S duality) that transforms the dilaton nonlinearly. If valid, this symmetry could provide an important means of obtaining information about ... More
Different approaches to TMD Evolution with scaleSep 18 2014Many apparently contradictory approaches to TMD factorization and its non-perturbative content exist. This talk evaluated the different methods and proposed tools for resolving the contradictions and experimentally adjudicating the results.
Do fragmentation functions in factorization theorems correctly treat non-perturbative effects?Oct 31 2016Current all-orders proofs of factorization of hard processes are made by extracting the leading power behavior of Feynman graphs, i.e., by extracting asymptotics strictly order-by-order in perturbation theory. The resulting parton densities and fragmentation ... More
Optimal Regularity for The Signorini Problem and its Free BoundaryOct 09 2013We will show optimal regularity for minimizers of the Signorini problem for the Lame system. In particular if $\u=(u^1,u^2,u^3)\in W^{1,2}(B_1^+:\R^3)$ minimizes $$ J(\u)=\int_{B_1^+}|\nabla \u+\nabla^\bot \u|^2+\lambda\div(\u)^2 $$ in the convex set ... More
Time dispersion and quantum mechanicsDec 03 2018In quantum mechanics the time dimension is treated as a parameter, while the three space dimensions are treated as observables. This assumption is both untested and inconsistent with relativity. From dimensional analysis, we expect quantum effects along ... More
The Special Aronszajn Tree Property at $κ^+$ and $\square_{κ, 2}$Jan 31 2019We show that for any regular cardinal $\kappa$, $\square_{\kappa, 2}$ is consistent with "all $\kappa^+$-Aronszajn trees are special." By a result of Shelah and Stanley this is optimal in the sense that $\square_{\kappa, 2}$ may not be strengthened to ... More
Orbit-superposition models of discrete, incomplete stellar kinematics: application to the Galactic centreSep 16 2018Jan 21 2019We present a method for fitting orbit-superposition models to the kinematics of discrete stellar systems when the available stellar sample has been filtered by a known selection function. The fitting method can be applied to any model in which the distribution ... More
Choosing a Knowledge Dissemination ApproachSep 15 2018Knowledge management has been described as getting the right knowledge to the right people in the right place at the right time. Knowledge dissemination is a crucial part of knowledge management because it ensures knowledge is available to those who need ... More
Perceptual Control with Large Feature and Actuator NetworksMar 25 2019This paper discusses elements of a control theory of systems comprised of networks of simple agents that collectively achieve sensing and actuation goals despite having strictly limited capability when acting alone. The goal is to understand {\em neuromorphic} ... More
Quantum Computational ComplexityApr 21 2008This article surveys quantum computational complexity, with a focus on three fundamental notions: polynomial-time quantum computations, the efficient verification of quantum proofs, and quantum interactive proof systems. Properties of quantum complexity ... More
Zero-knowledge against quantum attacksNov 03 2005This paper proves that several interactive proof systems are zero-knowledge against quantum attacks. This includes a few well-known classical zero-knowledge proof systems as well as quantum interactive proof systems for the complexity class HVQSZK, which ... More