Results for "Richard Mann"

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Minorities report: optimal incentives for collective intelligenceNov 11 2016Collective intelligence is the ability of a group to perform more effectively than any individual alone. Diversity among group members is a key condition for the emergence of collective intelligence, but maintaining diversity is challenging in the face ... More
Towards a fully predictive model of flight paths in pigeons navigating in the familiar area: prediction across differing individualsApr 20 2016This paper will detail the basis of our previously developed predictive model for pigeon flight paths based on observations of the specific individual being predicted. We will then describe how this model can be adapted to predict the flight of a new, ... More
Learning Sparse Wavelet RepresentationsFeb 08 2018In this work we propose a method for learning wavelet filters directly from data. We accomplish this by framing the discrete wavelet transform as a modified convolutional neural network. We introduce an autoencoder wavelet transform network that is trained ... More
The entropic basis of collective behaviourSep 24 2014In this paper, we identify a radically new viewpoint on the collective behaviour of groups of intelligent agents. We first develop a highly general abstract model for the possible future lives that these agents may encounter as a result of their decisions. ... More
A New Approach to Black Hole MicrostatesMay 30 1998If one encodes the gravitational degrees of freedom in an orthonormal frame field there is a very natural first order action one can write down (which in four dimensions is known as the Goldberg action). In this essay we will show that this action contains ... More
A note on the duality between interaction responses and mutual positions in flocking and schoolingApr 28 2014Jul 04 2014Background: Recent research in animal behaviour has contributed to determine how alignment, turning responses, and changes of speed mediate flocking and schooling interactions in different animal species. Here, we address specifically the problem of what ... More
Deep Reinforcement Learning in Large Discrete Action SpacesDec 24 2015Apr 04 2016Being able to reason in an environment with a large number of discrete actions is essential to bringing reinforcement learning to a larger class of problems. Recommender systems, industrial plants and language models are only some of the many real-world ... More
Imaging a Nitrogen-Vacancy Center with a Diamond Immersion MetalensNov 02 2017Solid-state quantum emitters have emerged as robust single-photon sources and addressable spins: key components in rapidly developing quantum technologies for broadband magnetometry, biological sensing, and quantum information science. Performance in ... More
Complex Spinors and Unified TheoriesJun 19 2013In this paper delivered by Murray Gell-Mann at the Stony Brook Supergravity Workshop in 1979, several paths to unification are discussed, from N=8 supergravity to $SU_5$, $SO_{10}$, and $E_6$. Generalizations of $SO_{10}$ to spinor representations of ... More
Measuring Unrecorded MeasurementApr 14 2016Projective (Von Neumann) Measurement of an operator (i.e. a dynamical variable) selected from a prescribed set of operators is termed unrecorded measurement (URM) when both the selected operator and the measurement outcome are unknown, i.e. "lost". Within ... More
Megaton Modular Multi-Purpose Neutrino DetectorAug 21 2001This brief note outlines a detector for the Homestake Laboratory and the physics experiments that might be done with it. The note might go on record as a letter of intent to be converted to a formal proposal at a later time.
Deconstructing the Welch Equation Using $p$-adic MethodsAug 21 2016The Welch map $x \rightarrow g^{x-1+c}$ is similar to the discrete exponential map $x \rightarrow g^x$, which is used in many cryptographic applications including the ElGamal signature scheme. This paper analyzes the number of solutions to the Welch equation: ... More
Finite Linear Spaces, Plane Geometries, Hilbert spaces and Finite Phase SpaceAug 03 2015Finite plane geometry is associated with finite dimensional Hilbert space. The association allows mapping of q-number Hilbert space observables to the c-number formalism of quantum mechanics in phase space. The mapped entities reflect geometrically based ... More
"Iff" is not expressible in independence-friendly logicJun 29 2008Ordinary first-order logic has the property that two formulas \phi and \psi have the same meaning in a structure if and only if the formula ``\phi iff \psi'' is true in the structure. We prove that independence-friendly logic does not have this property. ... More
On black strings & branes in Lovelock gravityMar 21 2006Mar 27 2006It is well known that black strings and branes may be constructed in pure Einstein gravity simply by adding flat directions to a vacuum black hole solution. A similar construction holds in the presence of a cosmological constant. While these constructions ... More
Group orderings, dynamics, and rigidityJun 30 2016Let G be a countable group. We prove several results on the (topological) relationship between the space CO(G) of circular orders on G, and the moduli space of actions of G on the circle. Similar results hold for spaces of left orders and actions on the ... More
Logarithmic degenerations of Landau-Ginzburg models for toric orbifolds and global tt^* geometryMay 28 2016We discuss the behavior of Landau-Ginzburg models for toric orbifolds near the large volume limit. This enables us to express mirror symmetry as an isomorphism of Frobenius manifolds which aquire logarithmic poles along a boundary divisor. If the toric ... More
Rigid motion revisited: rigid quasilocal framesOct 01 2008Nov 30 2008We introduce the notion of a rigid quasilocal frame (RQF) as a geometrically natural way to define a "system" in general relativity. An RQF is defined as a two-parameter family of timelike worldlines comprising the worldtube boundary of the history of ... More
Bayesian Optimal Active Search and SurveyingJun 27 2012We consider two active binary-classification problems with atypical objectives. In the first, active search, our goal is to actively uncover as many members of a given class as possible. In the second, active surveying, our goal is to actively query points ... More
On the Existence and Utility of Rigid Quasilocal FramesJul 07 2013The notion of a rigid quasilocal frame (RQF) provides a geometrically natural way to define a system in general relativity, and a new way to analyze the problem of motion. An RQF is defined as a two-parameter family of timelike worldlines comprising the ... More
Quasilocal Conservation Laws: Why We Need ThemJun 27 2012We argue that conservation laws based on the local matter-only stress-energy-momentum tensor (characterized by energy and momentum per unit volume) cannot adequately explain a wide variety of even very simple physical phenomena because they fail to properly ... More
M Dwarf Activity in the Pan-STARRS 1 Medium-Deep Survey: First Catalog and Rotation PeriodsAug 02 2016We report on an ongoing project to investigate activity in the M dwarf stellar population observed by the Pan-STARRS 1 Medium Deep Survey (PS1-MDS). Using a custom-built pipeline, we refine an initial sample of $\approx$ 4 million sources in PS1-MDS to ... More
Momentum in General Relativity: Local versus Quasilocal Conservation LawsJun 24 2013We construct a general relativistic conservation law for linear and angular momentum for matter and gravitational fields in a finite volume of space that does not rely on any spacetime symmetries. This work builds on our previous construction of a general ... More
Charged Rotating AdS Black Holes with Chern-Simons couplingOct 17 2016Oct 29 2016We obtain a perturbative solution for rotating charged black holes in 5-dimensional Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant. We start from a small undeformed Kerr-AdS solution and use the electric charge as a perturbative ... More
Holographic Complexity and Charged Scalar FieldsFeb 05 2019We construct a time-dependent expression of the computational complexity of a quantum system which consists of two conformal complex scalar field theories in d dimensions coupled to constant electric potentials and defined on the boundaries of a charged ... More
Paravectors and the Geometry of 3D Euclidean SpaceOct 22 2018We introduce the concept of paravectors to describe the geometry of points in a three dimensional space. After defining a suitable product of paravectors, we introduce the concepts of biparavectors and triparavectors to describe line segments and plane ... More
Killing spinors, the adS black hole and I(ISO(2,1)) gravityJun 12 1996We construct a supersymmetric extension of the $I\big(ISO(2,1)\big)$ Chern-Simons gravity and show that certain particle-like solutions and the adS black-hole solution of this theory are supersymmetric.
Holographic Complexity and Charged Scalar FieldsFeb 05 2019Feb 08 2019We construct a time-dependent expression of the computational complexity of a quantum system which consists of two conformal complex scalar field theories in d dimensions coupled to constant electric potentials and defined on the boundaries of a charged ... More
Light Cone Current AlgebraJan 17 2003This talk follows by a few months a talk by the same authors on nearly the same subject at the Coral Gables Conference. The ideas presented here are basically the same, but with some amplification, some change of viewpoint, and a number of new questions ... More
Dynamic Mode Decomposition for Financial Trading StrategiesAug 18 2015We demonstrate the application of an algorithmic trading strategy based upon the recently developed dynamic mode decomposition (DMD) on portfolios of financial data. The method is capable of characterizing complex dynamical systems, in this case financial ... More
Thermodynamics and phases in quantum gravityDec 02 2008Jun 30 2009We give an approach for studying quantum gravity effects on black hole thermodynamics. This combines a quantum framework for gravitational collapse with quasi-local definitions of energy and surface gravity. Our arguments suggest that (i) the specific ... More
Mirror fibrations and root stacks of weighted projective spacesMar 15 2008We show that the orbifold Chow ring of a root stack over a well-formed weighted projective space can be naturally seen as the Jacobian algebra of a function on a singular variety given by a partial compactification of its Ginzburg-Landau model.
Current Algebra: Quarks and What Else?Aug 01 2002After receiving many requests for reprints of this article, describing the original ideas on the quark gluon gauge theory, which we later named QCD, we decided to place the article in the e-Print archive.
SUSY Searches for Inclusive Squark and Gluino Production at the LHCMay 15 2013A selection of recent searches for Supersymmetry conducted by the ATLAS and CMS collaborations is presented, summarizing the relevant results for inclusive squark and gluino production at the LHC. No indication for the existence of Supersymmetry in terms ... More
Casimir Effect: The Classical LimitAug 23 1999Jun 01 2000We analyze the high temperature (or classical) limit of the Casimir effect. A useful quantity which arises naturally in our discussion is the ``relative Casimir energy", which we define for a configuration of disjoint conducting boundaries of arbitrary ... More
Adiabatic Analysis of Gravitationally-Induced Three-Flavor Neutrino OscillationsJan 19 1995Some implications of the proposal that flavor nondiagonal couplings of neutrinos to gravity might resolve the solar neutrino problem are considered in the context of three neutrino flavours. Using an adiabatic approximation iso-SNU curves are calculated ... More
Gravitationally--Induced Three--Flavor Neutrino Oscillations as a Possible Solution to the Solar Neutrino ProblemJul 20 1995Neutrinos can undergo flavor--oscillations if they possess flavor--dependent couplings to the surrounding gravitational field (the VEP mechanism). The neutrino fields can be massless, in accord with the Minimal Standard Model, but at the expense of the ... More
Choice of measurement as signalNov 30 2012Jun 28 2013In classical mechanics, performing a measurement without reading the measurement outcome is equivalent to not exploiting the measurement at all. A non-selective measurement in the classical realm carries no information. Here we show that the situation ... More
Generalized coherent states are unique Bell states of quantum systems with Lie group symmetriesJul 09 1997We consider quantum systems, whose dynamical symmetry groups are semisimple Lie groups, which can be split or decay into two subsystems of the same symmetry. We prove that the only states of such a system that factorize upon splitting are the generalized ... More
Parity-dependent squeezing of lightApr 20 1996A parity-dependent squeezing operator is introduced which imposes different SU(1,1) rotations on the even and odd subspaces of the harmonic oscillator Hilbert space. This operator is used to define parity-dependent squeezed states which exhibit highly ... More
A Family of Weyl-Wigner Transforms for Discrete Variables Defined in a Finite-Dimensional Hilbert SpaceJul 11 2015Nov 23 2016We study the Weyl-Wigner transform in the case of discrete variables defined in a Hilbert space of finite prime-number dimensionality $N$. We define a family of Weyl-Wigner transforms as function of a phase parameter. We show that it is only for a specific ... More
Nano Dust in Space and AstrophysicsOct 30 2018Nov 08 2018We summarize the Focus Meeting (FM10) "Nano Dust in Space and Astrophysics" held in Vienna, Austria on 28-29 August 2018 during the 30th General Assembly of the International Astronomical Union (IAU). The theme of this focus meeting is related to the ... More
Inside a Spinning Black StringSep 16 1994We show that mass inflation occurs inside spinning black cosmic string, which is a solution of a low-energy effective string theory in $(3+1)$-dimensions. This confirms Poisson and Israel's conjecture that the inner mass parameter diverges even if spacetime ... More
Dynamic scaling behavior of an interacting monomer--dimer modelAug 18 1995We study the dynamic scaling behavior of a monomer-dimer model with repulsive interactions between the same species in one dimension. With infinitely strong interactions the model exhibits a continuous transition from a reactive phase to an inactive phase ... More
Complex Organic Materials in the HR 4796A Disk?Aug 29 2008The red spectral shape of the visible to near infrared reflectance spectrum of the sharply-edged ring-like disk around the young main sequence star HR 4796A was recently interpreted as the presence of tholin-like complex organic materials which are seen ... More
Quantum ThermometryMay 22 2014In this review article we revisit and spell out the details of previous work on how Berry phase can be used to construct a precision quantum thermometer. An important advantage of such a scheme is that there is no need for the thermometer to acquire thermal ... More
Post-Newtonian Conservation Laws in Rigid Quasilocal FramesDec 12 2013Jan 10 2014In recent work we constructed completely general conservation laws for energy and linear and angular momentum of extended systems in general relativity based on the notion of a rigid quasilocal frame (RQF). We argued at a fundamental level that these ... More
Geoids in General Relativity: Geoid Quasilocal FramesOct 10 2015Nov 30 2015We develop, in the context of general relativity, the notion of a geoid -- a surface of constant "gravitational potential". In particular, we show how this idea naturally emerges as a specific choice of a previously proposed, more general and operationally ... More
Mass inflation in (1+1)-dimensional Dilaton GravityJun 14 1994We investigate the phenomenon of mass inflation in two-dimensional dilaton theories of gravity. We consider two distinct black hole spacetimes and construct the mass-inflation solution for each. Our analysis is extended to include multi-horizon spacetimes. ... More
Gravitation and Cosmology in Generalized (1+1)-dimensional dilaton gravityAug 25 1994The actions of the ``$R=T$'' and string-inspired theories of gravity in (1+1) dimensions are generalized into one single action which is characterized by two functions. We discuss differing interpretations of the matter stress-energy tensor, and show ... More
Black hole chemistry: thermodynamics with LambdaAug 22 2016We review recent developments on the thermodynamics of black holes in extended phase space, where the cosmological constant is interpreted as thermodynamic pressure and treated as a thermodynamic variable in its own right. In this approach, the mass of ... More
Classical Models of Subatomic ParticlesJul 21 1993We look at the program of modelling a subatomic particle---one having mass, charge, and angular momentum---as an interior solution joined to a classical general-relativistic Kerr-Newman exterior spacetime. We find that the assumption of stationarity upon ... More
The clustering of warm and cool IRAS galaxiesNov 08 1995We use a series of statistical techniques to compare the clustering of samples of IRAS galaxies selected on the basis of their far-infrared emission temperature, to see whether a temperature-dependent effect, such as might be produced by interaction-induced ... More
Escape path complexity and its context dependency in Pacific blue-eyes (Pseudomugil signifer)Feb 26 2015The escape trajectories animals take following a predatory attack appear to show high degrees of apparent 'randomness' - a property that has been described as 'protean behaviour'. Here we present a method of quantifying the escape trajectories of individual ... More
Discovery of the host galaxy of HDF850.1, the brightest sub-mm source in the Hubble Deep FieldMay 28 2002Despite extensive observational efforts, the brightest sub--mm source in the Hubble Deep Field, HDF850.1, has failed to yield a convincing optical/infrared identification almost 4 years after its discovery. This failure is all the more notable given the ... More
Transport of energetic electrons through the solar corona and the interplanetary spaceDec 22 2011During solar flares fast electron beams generated in the solar corona are non-thermal radio sources in terms of type III bursts. Sometimes they can enter into the interplanetary space, where they can be observed by in-situ measurements as it is done e.g. ... More
Realizing All Free Homotopy Classes for the Newtonian Three-Body ProblemDec 06 2014The configuration space of the planar three-body problem when collisions are excluded has a rich topology which supports a large set of free homotopy classes. Most classes survive modding out by rotations. Those that survive are called the reduced free ... More
Higgs Factory and 100 TeV Hadron Collider: Opportunity for a New World Laboratory within a DecadeFeb 24 2014Suggestions have been made for a 80-100 km circumference Future Circular Collider (FCC) that could ultimately contain a circular e+e- ring collider operating as a Higgs Factory as well as a 100 TeV hadron collider. Those suggestions have motivated us ... More
Diffeomorphism groups of balls and spheresApr 09 2013In this paper we discuss the relationship between groups of diffeomorphisms of spheres and balls. We survey results of a topological nature and then address the relationship as abstract (discrete) groups. We prove that the identity component Diff_0(S^{2n-1}) ... More
RNA Secondary Structures: Complex Statics and Glassy DynamicsOct 30 2007Feb 02 2008Models for RNA secondary structures (the topology of folded RNA) without pseudo knots are disordered systems with a complex state-space below a critical temperature. Hence, a complex dynamical (glassy) behavior can be expected, when performing Monte Carlo ... More
Classical limit of the Casimir entropy for scalar massless fieldAug 12 2007We study the Casimir effect at finite temperature for a massless scalar field in the parallel plates geometry in N spatial dimensions, under various combinations of Dirichlet and Neumann boundary conditions on the plates. We show that in all these cases ... More
Maximal Bell's Inequality Violation for Non Maximal EntanglementNov 19 2003Bell's inequality violation (BIQV) for correlations of polarization is studied for a {\it product} state of two two-mode squeezed vacuum (TMSV) states. The violation allowed is shown to attain its maximal limit for all values of the squeezing parameter, ... More
Factorizations and Physical RepresentationsAug 25 2005A Hilbert space in M dimensions is shown explicitly to accommodate representations that reflect the prime numbers decomposition of M. Representations that exhibit the factorization of M into two relatively prime numbers: the kq representation (J. Zak, ... More
Casimir energy of a dilute dielectric ball with uniform velocity of light at finite temperatureJan 05 2000Jan 07 2000The Casimir energy, free energy and Casimir force are evaluated, at arbitrary finite temperature, for a dilute dielectric ball with uniform velocity of light inside the ball and in the surrounding medium. In particular, we investigate the classical limit ... More
Cohomologie quantique orbifolde des espaces projectifs a poidsOct 16 2005In 2001, S. Barannikov showed that the Frobenius manifold coming from the quantum cohomology of the complex projective space is isomorphic to the Frobenius manifold attached to some Laurent polynomial. The purpose of this thesis is to generalize this ... More
Superfluid Black HolesSep 08 2016We present what we believe is the first example of a "$\lambda$-line" phase transition in black hole thermodynamics. This is a line of (continuous) second order phase transitions which in the case of liquid $^4$He marks the onset of superfluidity. The ... More
Planetary Embryo Bow Shocks as a Mechanism for Chondrule FormationMay 16 2016We use radiation hydrodynamics with direct particle integration to explore the feasibility of chondrule formation in planetary embryo bow shocks. The calculations presented here are used to explore the consequences of a Mars-size planetary embryo traveling ... More
Discussion of: A statistical analysis of multiple temperature proxies: Are reconstructions of surface temperatures over the last 1000 years reliable?May 11 2011Discussion of "A statistical analysis of multiple temperature proxies: Are reconstructions of surface temperatures over the last 1000 years reliable?" by B.B. McShane and A.J. Wyner [arXiv:1104.4002]
Unboundedness of some higher Euler classesSep 11 2017In this paper, we study Euler classes in groups of homeomorphisms of Seifert fibered 3-manifolds. We show that, in contrast to the familiar Euler class for $\mathrm{Homeo}_0(S^1)^\delta$, these Euler classes for $\mathrm{Homeo}_0(M^3)^\delta$ are unbounded ... More
Black hole chemistry and holography in generalized quasi-topological gravityFeb 06 2019We investigate the thermodynamics of AdS black holes in Generalized Quasitopological Gravity with and without electric charge, concentrating on the version of the theory that is cubic in curvature. We study new aspects of Hawking-Page transitions that ... More
Calorimeter-Based Triggers at the ATLAS Detector for Searches for Supersymmetry in Zero-Lepton Final StatesMay 22 2012This thesis consists of three closely related parts. An analysis of data recorded by the ATLAS detector in 2010 in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 33.4/pb is performed, searching for supersymmetric ... More
Orbifold quantum cohomology of weighted projective spacesOct 31 2006This article is a revised, short and english version of my PhD thesis. First, we show a mirror theorem : the Frobenius manifold associated to the orbifold quantum cohomology of weighted projective space is isomorphic to the one attached to a specific ... More
Energy of asymptotically AdS black holes in Exotic Massive Gravity and its log-extensionDec 22 2018Recently a new three-dimensional theory of gravity, dubbed Exotic Massive Gravity, was proposed as a unitary theory both in the bulk as well as in the dual CFT. This is the second simplest example, the first being Minimal Massive Gravity. Since the divergence ... More
Zeno Friction and Anti-friction from Quantum Collision ModelsFeb 20 2019We analyze the quantum mechanics of the friction experienced by a small system as it moves non-destructively with velocity $v$ over a surface. Specifically, we model the interactions between the system and the surface with a \textit{collision model}. ... More
Hyperbolicity of the Cyclic Splitting ComplexDec 12 2012Dec 14 2012We define a new complex on which $Out(F_n)$ acts by simplicial automorphisms, the cyclic splitting complex of $F_n$, and show that it is hyperbolic using a method developed by Kapovich and Rafi.
Counting Solutions to Discrete Non-Algebraic Equations Modulo Prime PowersAug 21 2016As society becomes more reliant on computers, cryptographic security becomes increasingly important. Current encryption schemes include the ElGamal signature scheme, which depends on the complexity of the discrete logarithm problem. It is thought that ... More
Philip Hall's 'rather curious' formula and the Rogers-Ramanujan identitiesMay 10 2015May 13 2015We show that a strange group theoretical formula of Hall follows from the Rogers-Ramanujan identities.
Automorphism groups of covering groupsMay 04 2015We derive a formula connecting the orders of the automorphism groups of a finite group and of its covering groups.
Quantum reference frames associated with non-compact groups: the case of translations and boosts, and the role of massFeb 24 2016Quantum communication without a shared reference frame or the construction of a relational quantum theory requires the notion of a quantum reference frame. We analyze aspects of quantum reference frames associated with non-compact groups, specifically ... More
Cavities in curved spacetimes: the response of particle detectorsOct 18 2013Jan 19 2014We introduce a method to compute particle detector transition probability in spacetime regions of general curved spacetimes provided that the curvature is not above a maximum threshold. In particular we use this method to compare the response of two detectors, ... More
Anti-Unruh PhenomenaApr 09 2015Oct 16 2015We find that a uniformly accelerated particle detector coupled to the vacuum can cool down as its acceleration increases, due to relativistic effects. We show that in (1+1)-dimensions, a detector coupled to the scalar field vacuum for finite timescales ... More
The SU(2) Long Range Bethe Ansatz and Continuous Integrable SystemsMay 02 2006May 26 2006We explore the relationship between the SU(2) sector of a general integrable field theory and the all-loop guess for the anomalous dimensions of SU(2) operators in N=4 super Yang-Mills theory. We demonstrate that the SU(2) structure of a nested Bethe ... More
Isolated critical point from Lovelock gravityJul 17 2014For any K(=2k+1)th-order Lovelock gravity with fine-tuned Lovelock couplings, we demonstrate the existence of a special isolated critical point characterized by non-standard critical exponents in the phase diagram of hyperbolic vacuum black holes. In ... More
Some group theoretical mass formulaeSep 10 2015A 'mass formula' is a formula involving a sum of reciprocals of automorphism groups orders. We provide several such formulae, e.g. ones involving covering groups of finite groups. Others generalize a formula of P.Hall, repalcing the class of abelian $p$-groups ... More
Role of evaporation in gravitational collapseOct 25 2016Nov 04 2016We study collapse of evaporating thin dust shells using two families of metrics to describe the {exterior geometry: the outgoing Vaidya metric and the retarded Schwarzschild metric. Both allow incorporation of Page's evaporation law (the latter in terms ... More
Mass Inflation in the Loop Black HoleApr 15 2011In classical general relativity the Cauchy horizon within a two-horizon black hole is unstable via a phenomenon known as mass inflation, in which the mass parameter (and the spacetime curvature) of the black hole diverges at the Cauchy horizon. Here we ... More
Shadows, Signals, and Stability in Einsteinian Cubic GravityJan 10 2018Apr 12 2018We conduct a preliminary investigation into the phenomenological implications of Einsteinian cubic gravity (ECG), a 4-dimensional theory of gravity cubic in curvature of interest for its unique formulation and properties. We find an analytic approximation ... More
Fixed points and connections between positive and negative cycles in Boolean networksSep 25 2015Oct 05 2015We are interested in the relationships between the number of fixed points in a Boolean network $f:\{0,1\}^ n\to\{0,1\}^n$ and its interaction graph $G$, which is the signed digraph on $\{1,\dots,n\}$ that describes the positive and negative influences ... More
On the length of attractors in boolean networks with an interaction graph by layersOct 30 2008We consider a boolean network whose interaction graph has no circuit of length >1. Under this hypothesis, we establish an upper bound on the length of the attractors of the network which only depends on its interaction graph.
Data Management Challenges in Paediatric Information SystemsFeb 24 2014There is a compelling demand for the data integration and exploitation of heterogeneous biomedical information for improved clinical practice, medical research, and personalised healthcare across the EU. The area of paediatric information integration ... More
Combinatorial structure of type dependencyFeb 27 2014We give an account of the basic combinatorial structure underlying the notion of type dependency. We do so by considering the category of all dependent sequent calculi, and exhibiting it as the category of algebras for a monad on a presheaf category. ... More
Iterated Integrals and Algebraic Cycles: Examples and ProspectsSep 25 2001Oct 26 2001This paper is for the proceedings of the Chen-Chow Conference held in Tianjin, China in October 2000. The goal of the paper is to produce and survey evidence for a connection between Chen's work on iterated integrals on the one hand, and algebraic cycles ... More
When causation does not imply correlation: robust violations of the Faithfulness axiomMay 12 2015We demonstrate that the Faithfulness property that is assumed in much causal analysis is robustly violated for a large class of systems of a type that occurs throughout the life and social sciences: control systems. These systems exhibit correlations ... More
Gonosomal AlgebraMar 22 2015We introduce the gonosomal algebra. Gonosomal algebra extend the evolution algebra of the bisexual population (EABP) defined by Ladra and Rozikov. We show that gonosomal algebras can represent algebraically a wide variety of sex determination systems ... More
The quark-gluon vertex in Landau gauge bound-state studiesApr 09 2014Apr 21 2015We present a practical method for the solution of the quark-gluon vertex for use in Bethe--Salpeter and Dyson--Schwinger calculations. The efficient decomposition into the necessary covariants is detailed, with the numerical algorithm outlined for both ... More
Bethe-Salpeter studies of mesons beyond rainbow-ladderDec 17 2009We investigate the masses of light mesons from a coupled system of Dyson-Schwinger and Bethe-Salpeter equations. The dominant non-Abelian and sub-leading Abelian contributions to the dressed quark-gluon vertex are explicitly taken into account. We also ... More
Physics of the linear colliderDec 01 2003This presentation intends to illustrate the specific capabilities of an e$^+$e$^-$ sub-TeV collider to provide answers on the basic issues in physics: origin of mass, hierarchy of masses, cosmological problems. Some foreseeable scenarios are discussed ... More
Relativity as the quantum mechanics of space-time measurementsMay 12 2000Jun 16 2000Can a simple microscopic model of space and time demonstrate Special Relativity as the macroscopic (aggregate) behavior of an ensemble ? The question will be investigated in three parts. First, it is shown that the Lorentz transformation formally stems ... More
Strong lensing time delay: a new way of measuring cosmic shearJan 23 2007Oct 27 2007The phenomenon of cosmic shear, or distortion of images of distant sources unaccompanied by magnification, is an effective way of probing the content and state of the foreground Universe, because light rays do not have to pass through mass structures ... More
Equivalence of A-Maximization and Volume MinimizationNov 08 2010The low energy effective theory on a stack of D3-branes at a Calabi-Yau singularity is an $\mathcal{N} = 1$ quiver gauge theory. The AdS/CFT correspondence predicts that the strong coupling dynamics of the gauge theory is described by weakly coupled type ... More