Results for "Eric Nielsen"

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Domain Walls and the Creation of StringsMar 28 2003May 27 2003The phenomenon of creation of strings, occurring when particles pass through a domain wall and related to the Hanany-Witten effect via dualities, is discussed in ten and nine dimensions. We consider both the particle actions in massive backgrounds as ... More
Characterization of lemniscate atmospheric aberrations in Gemini Planet Imager dataJul 18 2018A semi analytic framework for simulating the effects of atmospheric seeing in Adaptive Optics systems on an 8-m telescope is developed with the intention of understanding the origin of the wind-butterfly, a characteristic two-lobed halo in the PSF of ... More
An Integral Equation for Feynman's Operational CalculuiDec 16 2009In this paper we develop an integral equation satisfied by Feynman's operational calculi in formalism of B. Jefferies and G. W. Johnson. In particular a "reduced" disentangling is derived and an evolution equation of DeFacio, Johnson, and Lapidus is used ... More
The Domain Walls of Gauged Maximal Supergravities and their M-theory OriginApr 14 2004May 28 2004We consider gauged maximal supergravities with CSO(p,q,r) gauge groups and their relation to the branes of string and M-theory. The gauge groups are characterised by n mass parameters, where n is the transverse dimension of the brane. We give the scalar ... More
The Gemini NICI Planet-Finding Campaign: Asymmetries in the HD 141569 discApr 20 2015May 05 2015We report here the highest resolution near-IR imaging to date of the HD 141569A disc taken as part of the NICI Science Campaign. We recover 4 main features in the NICI images of the HD 141569 disc discovered in previous HST imaging: 1) an inner ring / ... More
A Uniform Analysis of 118 Stars with High-Contrast Imaging: Long Period Extrasolar Giant Planets are Rare around Sun-like StarsSep 24 2009We expand on the results of Nielsen et al. (2008), using the null result for giant extrasolar planets around the 118 target stars from the VLT NACO H and Ks band planet search (Masciadri et al. 2005), the VLT and MMT Simultaneous Differential Imaging ... More
Occurrence Rates from Direct Imaging SurveysFeb 27 2018The occurrence rate of young giant planets from direct imaging surveys is a fundamental tracer of the efficiency with which planets form and migrate at wide orbital distances. These measurements have progressively converged to a value of about 1% for ... More
Do we field high energy physics inside (almost) every solid or fluid at low temperature?Jun 07 2018It is an old idea of ours (H. B. "Nielsen Dual Models" section 6 "Catastrophe Theory Program" Scottish University Summer school 1976) that a most general material with only translation symmetry, but otherwise no symmetries should generically (in general) ... More
F(750), We Miss You, as Bound State of 6 Top and 6 Anti topOct 02 2016Oct 05 2016We collect and estimate support for our long speculated "multiple point principle" saying that there should be several vacua all having (compared to the scales of high energy physics) very low energy densities. In pure Standard Model we suggest there ... More
Small Representation PrincipleMar 06 2014In a previous article Don Bennett and I looked for, found and proposed a game in which the Standard Model Gauge Group $S(U(2) \times U(3))$ gets singled out as the "winner". This "game" means that the by Nature chosen gauge group should be just that one, ... More
String from Veneziano modelApr 27 2009This article is about my memories from the discovery that the Veneziano model describes in fact interacting strings. I came to the understanding of that the dual or Veneziano model is really a model of strings independently of L. Susskind and Y. Nambu. ... More
Efficient fourth order symplectic integrators for near-harmonic separable Hamiltonian systemsJan 18 2015Feb 09 2015Efficient fourth order symplectic integrators are proposed for numerical integration of separable Hamiltonian systems H(p,q)=T(p)+V(q). Symmetric splitting coefficients with five to nine stages are obtained by higher order decomposition of the simple ... More
The impact of lead time forecasting on the bullwhip effectSep 27 2013Jul 29 2015In this article we quantify the bullwhip effect (the variance amplification in replenishment orders) when demands and lead times are predicted in a simple two-stage supply chain with one supplier and one retailer. In recent research the impact of stochastic ... More
Supernovae as cosmological probesAug 31 2015The cosmological standard model at present is widely accepted as containing mainly things we do not understand. In particular the appearance of a Cosmological Constant, or dark energy, is puzzling. This was first inferred from the Hubble diagram of a ... More
Strictifying Homotopy Coherent Actions on Hochschild ComplexesMay 31 2018Dec 14 2018If P is a dg-operad acting on a dg-algebra A via algebra homomorphisms, then P acts on the Hochschild complex of A. In the more general case when P is a dg-prop, we show that P still acts on the Hochschild complex, but only up to coherent homotopy. We ... More
Transient Quintessence from Group Manifold Reductions or how all roads lead to RomeDec 10 2003Jan 08 2004We investigate the accelerating phases of cosmologies supported by a metric, scalars and a single exponential scalar potential. The different solutions can be represented by trajectories on a sphere and we find that quintessence happens within the "arctic ... More
The Gemini Planet Imager: Looking back over five years and forward to the futureJul 18 2018The Gemini Planet Imager (GPI), a coronagraphic adaptive optics instrument designed for spectroscopy of extrasolar planets, had first light in 2013[13]. After five years, GPI has observed more than 500 stars, producing an extensive library of science ... More
Upgrading the Gemini Planet Imager: GPI 2.0Jul 18 2018The Gemini Planet Imager (GPI) is the dedicated high-contrast imaging facility, located on Gemini South, designed for the direct detection and characterization of young Jupiter mass exoplanets. In 2019, Gemini is considering moving GPI from Gemini South ... More
Entropy stable wall boundary conditions for the three-dimensional compressible Navier-Stokes equationsNov 18 2014Nov 27 2014Non-linear entropy stability and a summation-by-parts framework are used to derive entropy stable wall boundary conditions for the three-dimensional compressible Navier--Stokes equations. A semi-discrete entropy estimate for the entire domain is achieved ... More
NACO-SDI direct imaging search for the exoplanet Eps Eri bMar 13 2007The active K2V star $\epsilon$ Eri hosts the most nearby known extrasolar planet. With an angular separation of about 1" on average, and an age of a few to several hundred Myrs, $\epsilon$ Eri b is one of the prime candidates for becoming the first definitive ... More
On power chi expansions of $f$-divergencesMar 14 2019We consider both finite and infinite power chi expansions of $f$-divergences derived from Taylor's expansions of smooth generators, and elaborate on cases where these expansions yield closed-form formula, bounded approximations, or analytic divergence ... More
Orbits for the Impatient: A Bayesian Rejection Sampling Method for Quickly Fitting the Orbits of Long-Period ExoplanetsMar 30 2017We describe a Bayesian rejection sampling algorithm designed to efficiently compute posterior distributions of orbital elements for data covering short fractions of long-period exoplanet orbits. Our implementation of this method, Orbits for the Impatient ... More
A Bayesian Framework for Exoplanet Direct Detection and Non-DetectionSep 21 2018Rigorously quantifying the information in high contrast imaging data is important for informing follow-up strategies to confirm the substellar nature of a point source, constraining theoretical models of planet-disk interactions, and deriving planet occurrence ... More
Guaranteed Deterministic Bounds on the Total Variation Distance between Univariate MixturesJun 29 2018The total variation distance is a core statistical distance between probability measures that satisfies the metric axioms, with value always falling in $[0,1]$. This distance plays a fundamental role in machine learning and signal processing: It is a ... More
q-Neurons: Neuron Activations based on Stochastic Jackson's Derivative OperatorsJun 01 2018Jun 14 2018We propose a new generic type of stochastic neurons, called $q$-neurons, that considers activation functions based on Jackson's $q$-derivatives with stochastic parameters $q$. Our generalization of neural network architectures with $q$-neurons is shown ... More
Discussion on the Cosmological Vacuum EnergyJun 24 2013The present discussion contribution is some remarks concerning and review of the proposal by one of us (C. Balazs) to explain the cosmological constant by a/the principle of entropy. Used without further comment this principle of entropy could easily ... More
Automatic HermiticitySep 02 2010Feb 23 2011We study a diagonalizable Hamiltonian that is not at first hermitian. Requirement that a measurement shall not change one Hamiltonian eigenstate into another one with a different eigenvalue imposes that an inner product must be defined so as to make the ... More
The Cheshire Cat Principle from HolographyApr 02 2009The Cheshire cat principle states that hadronic observables at low energy do not distinguish between hard (quark) or soft (meson) constituents. As a result, the delineation between hard/soft (bag radius) is like the Cheshire cat smile in Alice in wonderland. ... More
Deriving diffeomorphism symmetryDec 21 2014In an earlier article, we have "derived" space, as a part of the Random Dynamics project. In order to get locality we need to obtain reparametrization symmetry, or equivalently, diffeomorphism symmetry. There we sketched a procedure for how to get locality ... More
Explaining Phenomenologically Observed Space-time Flatness Requires New Fundamental Scale PhysicsJun 12 2013The phenomenologically observed flatness - or near flatness - of spacetime cannot be understood as emerging from continuum Planck (or sub-Planck) scales using known physics. Using dimensional arguments it is demonstrated that any immaginable action will ... More
Seeking a Game in which the standard model Group shall WinJun 11 2013It is attempted to construct a group-dependent quantity that could be used to single out the Standard Model group S(U(2) x U(3)) as being the "winner" by this quantity being the biggest possible for just the Standard Model group. The suggested quantity ... More
Our String Field Theory Liberating Left and Right Movers as Constituent "Objects"Dec 13 2012We review the idea of our earlier proposed string field theory \cite{early1,early2,ourappear}, which makes the second quantized string theory appear as described by one or two types of stationary - so called - "objects" for string theories respectively ... More
Formulation of Complex Action TheoryApr 18 2011Apr 23 2012We formulate a complex action theory which includes operators of coordinate and momentum $\hat{q}$ and $\hat{p}$ being replaced with non-hermitian operators $\hat{q}_{new}$ and $\hat{p}_{new}$, and their eigenstates ${}_m <_{new} q |$ and ${}_m <_{new} ... More
Card game restriction in LHC can only be successful!Oct 02 2009Oct 23 2009We argue that a restriction determined by a drawn card or quantum random numbers, on the running of LHC (Large Hadron Collider), which was proposed in earlier articles by us, can only result in an, at first, apparent success whatever the outcome. This ... More
The Problem of Monopoles in the Standard and Family Replicated ModelsNov 27 2003The aim of the present talk is to show that monopoles cannot play any role in the Standard Model (SM) and in its usual extensions up to the Planck scale: $M_{Pl}=1.22\cdot 10^{19}$ GeV, because they have a huge charge and are completely confined or screened. ... More
Baryogenesis via Lepton Number Violation and Family Replicated Gauge GroupApr 02 2002May 02 2002We developed a previous model fitting all quark and lepton -- including neutrino quantities in the region of the Large Mixing Angle-MSW solar solution -- order of magnitudewise by only six adjustable parameters (Higgs vacuum expectation values) to also ... More
A Non-SUSY Model for Neutrino Oscillation, Baryogenesis and Neutrinoless Double Beta DecayOct 09 2001We fitted the neutrino oscillations, baryogenesis and neutrinoless double beta decay using Anti-GUT model.
Non-existence of Irreversible Processes in Compact Space TimeFeb 19 2006Dec 20 2006It is shown that if physical space time were truly compact there would only be of the order of one solutions to the classical field equations with a weighting to be explained. But that would not allow any peculiar choice of initial conditions that could ... More
Law Behind Second Law of Thermodynamics --Unification with Cosmology--Feb 02 2006In an abstract setting of a general classical mechanical system as a model for the universe we set up a general formalism for a law behind the second law of thermodynamics, i.e. really for "initial conditions". We propose a unification with the other ... More
Family replicated calculation of baryogenesisApr 09 2002In our model with a Standard Model gauge group extended with a baryon number minus lepton number charge for each family of quarks and leptons, we calculate the baryon number relative to entropy produced in early Big Bang by the Fukugita-Yanagida mechanism. ... More
Baryogenesis via lepton number violation in Anti-GUT modelJan 27 2001Feb 23 2001We study the baryogenesis via lepton number violation in the model of Anti-GUT. The origin of the baryogenesis is the existence of right-handed Majorana neutrinos which decay in a C, CP and lepton number violation way. The baryon number asymmetry is calculated ... More
QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$ mesonsApr 30 2008We use QCD sum rules to test the nature of the recently observed mesons Y(4260), Y(4350) and Y(4660), assumed to be exotic four-quark $(c\bar{c}q\bar{q})$ or $(c\bar{c}s\bar{s})$ states with $J^{PC}=1^{--}$. We work at leading order in $\alpha_s$, consider ... More
Counterexamples to the B-spline conjecture for Gabor framesJul 14 2015Aug 19 2015The frame set conjecture for B-splines $B_n$, $n \ge 2$, states that the frame set is the maximal set that avoids the known obstructions. We show that any hyperbola of the form $ab=r$, where $r$ is a rational number smaller than one and $a$ and $b$ denote ... More
Spreading the gospel: The Bohr atom popularisedDec 12 2011The emergence of quantum theory in the early decades of the twentieth century was accompanied by a wide range of popular science books, all of which presented in words and in images new scientific ideas about the structure of the atom. The work of physicists ... More
The WIYN Open Cluster Study Photometric Binary Survey: Initial Findings for NGC 188Sep 17 2007The WIYN open cluster study (WOCS) has been working to yield precise magnitudes in the Johnson-Kron-Cousins UBVRI system for all stars in the field of a selection of ``prototypical'' open clusters. Additionally, WOCS is using radial velocities to obtain ... More
The performance of a combined solar photovoltaic (PV) and thermoelectric generator (TEG) systemAug 06 2015The performance of a combined solar photovoltaic (PV) and thermoelectric generator (TEG) system is examined using an analytical model for four different types of commercial PVs and a commercial bismuth telluride TEG. The TEG is applied directly on the ... More
The Segal conjecture for topological Hochschild homology of complex cobordismOct 27 2010May 12 2011We study the C_p-equivariant Tate construction on the topological Hochschild homology THH(B) of a symmetric ring spectrum B by relating it to a topological version R_+(B) of the Singer construction, extended by a natural circle action. This enables us ... More
Global Stability of a Class of Difference Equations on Solvable Lie AlgebrasFeb 04 2019Feb 07 2019Motivated by the ubiquitous sampled-data setup in applied control, we examine the stability of a class of difference equations that arises by sampling a right- or left-invariant flow on a matrix Lie group. The map defining such a difference equation has ... More
Games and Ramsey-like cardinalsApr 27 2018Oct 30 2018We generalise the $\alpha$-Ramsey cardinals introduced in Holy and Schlicht (2018) for cardinals $\alpha$ to arbitrary ordinals $\alpha$, and answer several questions posed in that paper. In particular, we show that $\alpha$-Ramseys are downwards absolute ... More
Higher order relativistic galaxy number counts: dominating termsJun 07 2016Mar 10 2017We review the number counts to second order concentrating on the terms which dominate on sub horizon scales. We re-derive the result for these terms and compare it with the different versions found in the literature. We generalize our derivation to higher ... More
On Homogeneous Decomposition Spaces and Associated Decompositions of Distribution SpacesNov 06 2017Dec 19 2017A new construction of decomposition smoothness spaces of homogeneous type is considered. The smoothness spaces are based on structured and flexible decompositions of the frequency space $\mathbb{R}^d\backslash\{0\}$. We construct simple adapted tight ... More
Nonlinear approximation with nonstationary Gabor framesApr 24 2017Jan 02 2018We consider sparseness properties of adaptive time-frequency representations obtained using nonstationary Gabor frames (NSGFs). NSGFs generalize classical Gabor frames by allowing for adaptivity in either time or frequency. It is known that the concept ... More
Limit theorems for quadratic forms and related quantities of discretely sampled continuous-time moving averagesJul 04 2018Aug 17 2018The limiting behavior of Toeplitz type quadratic forms of stationary processes has received much attention through decades, particularly due to its importance in statistical estimation of the spectrum. In the present paper we study such quantities in ... More
Statistics of predictions with missing higher order correctionsOct 06 2016May 24 2017Effective operators have been used extensively to understand small deviations from the Standard Model in the search for new physics. So far there has been no general method to fit for small parameters when higher order corrections in these parameters ... More
Gabor windows supported on $[-1,1]$ and construction of compactly supported dual windows with optimal frequency localizationFeb 12 2019We consider Gabor frames $\{e^{2\pi i bm \cdot} g(\cdot-ak)\}_{m,k \in \mathbb{Z}}$ with translation parameter $a=L/2$, modulation parameter $b \in (0,2/L)$ and a window function $g \in C^n(\mathbb{R})$ supported on $[x_0,x_0+L]$ and non-zero on $(x_0,x_0+L)$ ... More
The Origins Space Telescope: Towards An Understanding of Temperate Planetary AtmospheresMar 21 2018The Origins Space Telescope (OST) is one of four mission concepts currently being studied by NASA in preparation for the Astrophysics 2020 Decadal Survey. With active cooling (~4 K), OST will be sensitive in mid- to far-IR wavelengths, using imaging and ... More
Lessons for WFIRST CGI from ground-based high-contrast systemsJan 13 2019The Coronagraph Instrument (CGI) for NASA's Wide Field Infrared Survey Telescope (WFIRST) will constitute a dramatic step forward for high-contrast imaging, integral field spectroscopy, and polarimetry of exoplanets and circumstellar disks, aiming to ... More
The Bianchi Classification of Maximal D=8 Gauged SupergravitiesJun 19 2003Aug 26 2003We perform the generalised dimensional reduction of D=11 supergravity over three-dimensional group manifolds as classified by Bianchi. Thus, we construct eleven different maximal D=8 gauged supergravities, two of which have an additional parameter. One ... More
Very high contrast IFU spectroscopy of AB Doradus C: 9 mag contrast at 0.2" without a coronagraph using spectral deconvolutionMar 21 2007We present an extension of the spectral deconvolution method (Sparks & Ford 2002) to achieve very high contrast at small inner working radii. We apply the method to the specific case of ground based adaptive optics fed integral field spectroscopy (without ... More
Improved age constraints for the AB Dor quadruple system - The binary nature of AB Dor BNov 20 2006We present resolved NACO photometry of the close binary AB Dor B in H- and Ks-band. AB Dor B is itself known to be a wide binary companion to AB Dor A, which in turn has a very low-mass close companion named AB Dor C. These four known components make ... More
TensorFlow.js: Machine Learning for the Web and BeyondJan 16 2019Feb 28 2019TensorFlow.js is a library for building and executing machine learning algorithms in JavaScript. TensorFlow.js models run in a web browser and in the Node.js environment. The library is part of the TensorFlow ecosystem, providing a set of APIs that are ... More
Information geometries and Microeconomic TheoriesJan 16 2009More than thirty years ago, Charnes, Cooper and Schinnar (1976) established an enlightening contact between economic production functions (EPFs) -- a cornerstone of neoclassical economics -- and information theory, showing how a generalization of the ... More
Constraints on Extrasolar Planet Populations from VLT NACO/SDI and MMT SDI and Direct Adaptive Optics Imaging Surveys: Giant Planets are Rare at Large SeparationsJun 28 2007Oct 10 2007We examine the implications for the distribution of extrasolar planets based on the null results from two of the largest direct imaging surveys published to date. Combining the measured contrast curves from 22 of the stars observed with the VLT NACO adaptive ... More
New Photometry and Spectra of AB Doradus C: An Accurate Mass Determination of a Young Low-Mass Object with Theoretical Evolutionary TracksMar 21 2007We present new photometric and spectroscopic measurements for the unique, young, low-mass evolutionary track calibrator AB Dor C. While the new Ks photometry is similar to that previously published in Close et al. (2005) the spectral type is found to ... More
A Reflective Gaussian Coronagraph for ExAO: Laboratory PerformanceOct 21 2006Oct 24 2006We report laboratory results of a coronagraphic test bench to assess the intensity reduction differences between a "Gaussian" tapered focal plane coronagraphic mask and a classical hard-edged "Top Hat" function mask at Extreme Adaptive Optics (ExAO) Strehl ... More
Modeling of realistic cladding structures for air-core photonic band-gap fibersOct 30 2003Cladding structures of photonic band-gap fibers often have air-holes of non-circular shape and, typically, close-to-hexagonal air holes with curved corners are observed. We study photonic band-gaps in such structures by aid of a two-parameter representation ... More
Inflation from Asymptotically Safe TheoriesMar 02 2015We investigate models in which inflation is driven by an ultraviolet safe and interacting scalar sector stemming from a new class of nonsupersymmetric gauge field theories. These new theories, differently from generic scalar models, are well defined to ... More
Remarkable coincidence for the top Yukawa coupling and an approximately massless bound stateNov 13 2008Oct 21 2009We calculate, with several corrections, the non-relativistic binding by Higgs exchange and gluon exchange between six top and six anti-top quarks (actually replaced by left-handed b quarks from time to time). The remarkable result is that, within our ... More
Dark Energy density in models with Split Supersymmetry and degenerate vacuaMar 10 2011Dec 26 2011In N=1 supergravity supersymmetric (SUSY) and non-supersymmetric Minkowski vacua originating in the hidden sector can be degenerate. In the supersymmetric phase in flat Minkowski space non-perturbative supersymmetry breakdown may take place in the observable ... More
An example of Kaluza-Klein-like theories leading after compactification to massless spinors coupled to a gauge fieldNov 05 2003May 18 2005The genuine Kaluza-Klein-like theories (with no fields in addition to gravity with torsion) have difficulties with the existence of massless spinors after the compactification of some of dimensions of space\cite{witten}. We demonstrate in this letter ... More
Dynamical determination of the top quark and Higgs masses in the Standard ModelJul 12 1996We consider the application of the multiple point criticality principle to the pure Standard Model, with a desert up to the Planck scale. According to this principle, Nature should choose coupling constant values such that the vacuum can exist in degenerate ... More
Marginal evidence for cosmic acceleration from Type Ia supernovaeJun 03 2015Oct 17 2016The "standard" model of cosmology is founded on the basis that the expansion rate of the universe is accelerating at present --- as was inferred originally from the Hubble diagram of Type Ia supernovae. There exists now a much bigger database of supernovae ... More
Algorithms for Simultaneous Padé ApproximationsFeb 02 2016May 23 2016We describe how to solve simultaneous Pad\'e approximations over a power series ring $K[[x]]$ for a field $K$ using $O~(n^{\omega - 1} d)$ operations in $K$, where $d$ is the sought precision and $n$ is the number of power series to approximate. We develop ... More
Mathematical Properties of Dynamic Systems and the Foundations of Quantum TheoryJun 11 2011Sep 29 2016While it is almost universally accepted that quantum theory is strange, and that the world view it implies is elusive, there is considerably less consensus as to why this is the case. This article will explore the possibility that part of the reason the ... More
Anderson's considerations on the flow of superfluid helium: some offshootsJun 21 2014Apr 17 2015Nearly five decades have elapsed since the seminal 1966 paper of P.W. Anderson on the flow of superfluid helium, $^4$He at that time. Some of his "Considerations" -- the role of the quantum phase as a dynamical variable, the interplay between the motion ... More
Eulerian series as modular forms revisitedApr 15 2013Jun 04 2014Recently, Bringmann, Ono, and Rhoades employed harmonic weak Maass forms to prove results on Eulerian series as modular forms. By changing the setting to Appell--Lerch sums, we shorten the proof of one of their main theorems. In addition we discuss connections ... More
Threefield identities and simultaneous representations of primes by binary quadratic formsAug 07 2012Kaplansky [2003] proved a theorem on the simultaneous representation of a prime $p$ by two different principal binary quadratic forms. Later, Brink found five more like theorems and claimed that there were no others. By putting Kaplansky-like theorems ... More
The Role of Electrical and Thermal Contact Resistance for Joule Breakdown of Single-Wall Carbon NanotubesMay 13 2008Several data sets of electrical breakdown in air of single-wall carbon nanotubes (SWNTs) on insulating substrates are collected and analyzed. A universal scaling of the Joule breakdown power with nanotube length is found, which appears independent of ... More
Locomotion in complex fluids: Integral theoremsOct 15 2014The biological fluids encountered by self-propelled cells display complex microstructures and rheology. We consider here the general problem of low-Reynolds number locomotion in a complex fluid. {Building on classical work on the transport of particles ... More
Apparent slip due to the motion of suspended particles in flows of electrolyte solutionsMar 02 2004We consider pressure-driven flows of electrolyte solutions in small channels or capillaries in which tracer particles are used to probe velocity profiles. Under the assumption that the double layer is thin compared to the channel dimensions, we show that ... More
Continuous breakdown of Purcell's scallop theorem with inertiaJun 25 2007Purcell's scallop theorem defines the type of motions of a solid body - reciprocal motions - which cannot propel the body in a viscous fluid with zero Reynolds number. For example, the flapping of a wing is reciprocal and, as was recently shown, can lead ... More
Floppy swimming: Viscous locomotion of actuated elasticaOct 05 2006May 07 2007Actuating periodically an elastic filament in a viscous liquid generally breaks the constraints of Purcell's scallop theorem, resulting in the generation of a net propulsive force. This observation suggests a method to design simple swimming devices - ... More
3D Texture Coordinates on Polygon Mesh SequencesJun 26 2014Jun 27 2014A method for creating 3D texture coordinates for a sequence of polygon meshes with changing topology and vertex motion vectors.
Power-law tail distributions and nonergodicityMay 27 2004May 28 2004We establish an explicit correspondence between ergodicity breaking in a system described by power-law tail distributions and the divergence of the moments of these distributions.
Non-Markovian Beables vs. Massive ParallelismMar 16 2010A simple dynamical model over a discrete classical state space is presented. In a certain limit, it reduces to one in a class of models subsuming Bell's field-theoretic version of Bohmian mechanics. But it exhibits the massive parallelism native to quantum ... More
Aging in the trap model as a relaxation further away from equilibriumOct 17 2012The aging regime of the trap model, observed for a temperature T below the glass transition temperature T_g, is a prototypical example of non-stationary out-of-equilibrium state. We characterize this state by evaluating its "distance to equilibrium", ... More
Global fluctuations and Gumbel statisticsJun 07 2005Oct 18 2005We explain how the statistics of global observables in correlated systems can be related to extreme value problems and to Gumbel statistics. This relationship then naturally leads to the emergence of the generalized Gumbel distribution G_a(x), with a ... More
Density waves in the inner parts of disk galaxiesJan 11 2002Density waves in the central kpc of galaxies, taking the form of spirals, bars and/or lopsided density distributions, are potential actors of the redistribution of angular momentum. They may thus play an important role in the overall evolution of the ... More
Recent developments in heterotic compactificationsJan 26 2008In this short review, we outline three sets of developments in understanding heterotic string compactifications. First, we outline recent progress in heterotic analogues of quantum cohomology computations. Second, we discuss a potential swampland issue ... More
The Origin, Evolution and Development of Bilateral Symmetry in Multicellular OrganismsJul 13 2012A computational theory and model of the ontogeny and development of bilateral symmetry in multicellular organisms is presented. Understanding the origin and evolution of bilateral organisms requires an understanding of how bilateral symmetry develops, ... More
Dynkin Diagrams of ${CP}^1$ OrbifoldsApr 27 1993We investigate $N=2$ supersymmetric sigma model orbifolds of the sphere in the large radius limit. These correspond to $N=2$ superconformal field theories. Using the equations of topological-anti-topological fusion for the topological orbifold, we compute ... More
i-MARK: A New Subtraction Division GameSep 14 2015Nov 09 2015Given two finite sets of integers $S\subseteq\NNN\setminus\{0\}$ and $D\subseteq\NNN\setminus\{0,1\}$,the impartial combinatorial game $\IMARK(S,D)$ is played on a heap of tokens. From a heap of $n$ tokens, each player can moveeither to a heap of $n-s$ ... More
Thermal Infrared Sky Background for a High-Arctic Mountain ObservatoryAug 26 2016Nighttime zenith sky spectral brightness in the 3.3 to 20 micron wavelength region is reported for an observatory site nearby Eureka, on Ellesmere Island in the Canadian High Arctic. Measurements derive from an automated Fourier-transform spectrograph ... More
Variation After Response in Quantum Monte CarloMay 30 2016We present a new method for modeling electronically excited states that overcomes a key failing of linear response theory by allowing the underlying ground state ansatz to relax in the presence of an excitation. The method is variational, has a cost similar ... More
Homological Invariants of FI-modules and FI_G-modulesNov 12 2015Feb 15 2016We explore a theory of depth for FI_G-modules which are presented in finite degrees. Using this theory, we prove results about the regularity, and provide novel bounds on stable ranges of FI-modules, making effective a theorem of Nagpal and thereby refining ... More
Review of Heavy Hadron SpectroscopySep 28 2005Sep 29 2005The status of some of the recently discovered heavy hadrons is presented.
A Study into the Feasibility of Obtaining Finite Source Sizes From MACHO-type Microlensing Light CurvesAug 14 1996Recent discussion of the effects of finite source size on high magnification microlensing events due to MACHOs motivates a study into the feasibility of observing such effects and extracting the source radius. Simulated observations are generated by adding ... More
Entanglement Entropy in Jammed CFTsMay 30 2016We construct solutions to the Einstein equations for asymptotically locally Anti-de Sitter spacetimes with four, five, and six dimensional Reissner-Nordstr\"om boundary metrics. These spacetimes are gravitational duals to "jammed" CFTs on those backgrounds ... More
Collisional interactions between self-interacting non-relativistic boson stars: effective potential analysis and numerical simulationsJul 29 2016Scalar particles are a common prediction of many beyond the Standard Model theories. If they are light and cold enough, there is a possibility they may form Bose-Einstein condensates, which will then become gravitationally bound. These boson stars are ... More
Bialgebra Realization (3). Induced Module, Envelopping Bialgebra, Dual. The Example of the Integration of Classical Vectors FieldsJul 27 2006In this article an interpretation and a proof of some classical \\theorems in analysis on the integration of analytic vectors fields are derived from the algebraic method of realization of bialgebras which are constructed with the data of a linear application ... More