Results for "Ph. Wenzel"

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Basic aspects of high-power semiconductor laser simulationFeb 01 2013The aim of this paper is to review some of the models and solution techniques used in the simulation of high-power semiconductor lasers and to address open questions. We discuss some of the peculiarities in the description of the optical field of wide-aperture ... More
Strong martingale type and uniform smoothnessJul 28 2004We introduce stronger versions of the usual notions of martingale type p <= 2 and cotype q >= 2 of a Banach space X and show that these concepts are equivalent to uniform p-smoothness and q-convexity, respectively. All these are metric concepts, so they ... More
Interaction with Formal Mathematical Documents in Isabelle/PIDEMay 05 2019Isabelle/PIDE has emerged over more than 10 years as the standard Prover IDE for interactive theorem proving in Isabelle. The well-established Archive of Formal Proofs (AFP) testifies the success of such applications of formalized mathematics in Isabelle/HOL. ... More
Isabelle technology for the Archive of Formal Proofs with application to MMTMay 17 2019Jun 11 2019This is an overview of the Isabelle technology behind the Archive of Formal Proofs (AFP). Interactive development and quasi-interactive build jobs impose significant demands of scalability on the logic (usually Isabelle/HOL), on Isabelle/ML for mathematical ... More
Isabelle/jEdit as IDE for Domain-specific Formal Languages and Informal Text DocumentsNov 27 2018Isabelle/jEdit is the main application of the Prover IDE (PIDE) framework and the default user-interface of Isabelle, but it is not limited to theorem proving. This paper explores possibilities to use it as a general IDE for formal languages that are ... More
System description: Isabelle/jEdit in 2014Oct 30 2014This is an updated system description for Isabelle/jEdit, according to the official release Isabelle2014 (August 2014). The following new PIDE concepts are explained: asynchronous print functions and document overlays, syntactic and semantic completion, ... More
Declarative Programming for Microcontrollers -- Datalog on ArduinoAug 30 2019In this paper we describe an approach to programming microcontrollers based on the Arduino platform using Datalog as a clear and concise description language for system behaviors. The application areas of cheap and easily programmable microcontrollers, ... More
On the Non-Equivalence of Rearranged Walsh and Trigonometric Systems in L_pAug 10 2003We consider the question whether the trigonometric system can be equivalent to some rearrangement of the Walsh system in L_p for some p<>2. We show that this question is closely related to a combinatorial problem. This enables us to prove non-equivalence ... More
Isabelle/PIDE as Platform for Educational ToolsFeb 22 2012The Isabelle/PIDE platform addresses the question whether proof assistants of the LCF family are suitable as technological basis for educational tools. The traditionally strong logical foundations of systems like HOL, Coq, or Isabelle have so far been ... More
Impressions of convexity - An illustration for commutator boundsApr 15 2010We determine the sharpest constant $C_{p,q,r}$ such that for all complex matrices $X$ and $Y$, and for Schatten $p$-, $q$- and $r$-norms the inequality $$ \|XY-YX\|_p\leq C_{p,q,r}\|X\|_q\|Y\|_r $$ is valid. The main theoretical tool in our investigations ... More
Non-Linear Transport through a Molecular NanojunctionNov 02 2000Dec 18 2001We present a simple model of electrical transport through a metal-molecule-metal nanojunction that includes charging effects as well as aspects of the electronic structure of the molecule. The interplay of a large charging energy and an asymmetry of the ... More
The nuclear liquid gas phase transition and phase coexistence: A reviewOct 18 2004In this talk we will review the different signals of liquid gas phase transition in nuclei. From the theoretical side we will first discuss the foundations of the concept of equilibrium, phase transition and critical behaviors in infinite and finite systems. ... More
The Coulomb Gas Behaviour of Two Dimensional TurbulenceMay 18 1995The long-time large-distance behaviour of free decaying two dimensional turbulence is studied. Stochastic solutions of the Navier-Stokes equation are explicitly shown to follow renormalisation group trajectories. It is proven that solutions of the Navier-Stokes ... More
From LCF to Isabelle/HOLJul 05 2019Jul 17 2019Interactive theorem provers have developed dramatically over the past four decades, from primitive beginnings to today's powerful systems. Here, we focus on Isabelle/HOL and its distinctive strengths. They include automatic proof search, borrowing techniques ... More
$B\to K^* γ$ decay on APEJan 13 1995We present results for the radiative decay $B\to K^* \gamma$, obtained by using the Clover action at $\beta = 6.0$ on APE. The compatibility between the scaling laws predicted by the Heavy Quark Effective Theory (HQET) and pole dominance is discussed. ... More
Towards Self-Supervised High Level Sensor FusionFeb 12 2019In this paper, we present a framework to control a self-driving car by fusing raw information from RGB images and depth maps. A deep neural network architecture is used for mapping the vision and depth information, respectively, to steering commands. ... More
Latent Space Reinforcement Learning for Steering Angle PredictionFeb 11 2019Model-free reinforcement learning has recently been shown to successfully learn navigation policies from raw sensor data. In this work, we address the problem of learning driving policies for an autonomous agent in a high-fidelity simulator. Building ... More
Graviton Absorption by Non-BPS BranesJan 12 2001We consider the behaviour of neutral non-BPS branes probed by scalars and gravitons. We show that the naked singularity of the non-BPS branes is a {\it repulson} absorbing no incoming radiation. The naked singularity is surrounded by an infinite potential ... More
A Renormalisation Group Analysis of 2d Freely Decaying Magnetohydrodynamic TurbulenceJun 25 1996We study two dimensional freely decaying magnetohydrodynamic turbulence. We investigate the time evolution of the probability law of the gauge field and the stream function. Assuming that this probability law is initially defined by a statistical field ... More
A Renormalisation Group Study of Three Dimensional TurbulenceJul 30 1996We study the three dimensional Navier-Stokes equation with a random Gaussian force acting on large wavelengths. Our work has been inspired by Polyakov's analysis of steady states of two dimensional turbulence. We investigate the time evolution of the ... More
The Supermoduli Space of Matrix String TheoryDec 13 1999We study matrix string scattering amplitudes and matrix string instantons on a marked Riemann surface in the limit of a vanishing string coupling constant. We give an explicit parameterization of the moduli space of such instantons. We also give a description ... More
Non-BPS Instability in Heterotic M-theoryFeb 22 2001We study the warped geometry of heterotic M-Theory in five dimensions where five-branes are included in the bulk. Five-branes wrapping holomorphic curves lead to BPS configurations where the junction conditions are automatically satisfied. We consider ... More
Set-up for multi coincidence experiments of EUV to VIS photons and charged particles -- the solid angle maximization approachJun 11 2019The coincident detection of particles is a powerful method in experimental physics, enabling the investigation of a variety of projectile-target interactions. The vast majority of coincidence experiments is performed with charged particles, as they can ... More
Scalable Generalized Dynamic Topic ModelsMar 21 2018Dynamic topic models (DTMs) model the evolution of prevalent themes in literature, online media, and other forms of text over time. DTMs assume that word co-occurrence statistics change continuously and therefore impose continuous stochastic process priors ... More
READ-EVAL-PRINT in Parallel and Asynchronous Proof-checkingJul 08 2013The LCF tradition of interactive theorem proving, which was started by Milner in the 1970-ies, appears to be tied to the classic READ-EVAL-PRINT-LOOP of sequential and synchronous evaluation of prover commands. We break up this loop and retrofit the read-eval-print ... More
Real and complex operator idealsApr 12 1994The powerful concept of an operator ideal on the class of all Banach spaces makes sense in the real and in the complex case. In both settings we may, for example, consider compact, nuclear, or $2$--summing operators, where the definitions are adapted ... More
Ideal norms associated with the UMD-propertyOct 15 1997We prove the asymptotic equivalence of three sequences of ideal norms associated with the UMD-property of Banach spaces.
Uniformly convex operators and martingale typeFeb 08 2002The concept of uniform convexity of a Banach space was generalized to linear operators between Banach spaces and studied by Beauzamy [1976]. Under this generalization, a Banach space X is uniformly convex if and only if its identity map I_X is. Pisier ... More
PIDE as front-end technology for CoqApr 24 2013Isabelle/PIDE is the current Prover IDE technology for Isabelle. It has been developed in ML and Scala in the past 4-5 years for this particular proof assistant, but with an open mind towards other systems. PIDE is based on an asynchronous document model, ... More
Isabelle/jEdit --- a Prover IDE within the PIDE frameworkJul 14 2012PIDE is a general framework for document-oriented prover interaction and integration, based on a bilingual architecture that combines ML and Scala. The overall aim is to connect LCF-style provers like Isabelle (or Coq or HOL) with sophisticated front-end ... More
Ideal norms and trigonometric orthonormal systemsApr 12 1994In this article, we characterize the $UMD$--property of a Banach space $X$ by ideal norms associated with trigonometric orthonormal systems. The asymptotic behavior of that numerical parameters can be used to decide whether or not $X$ is a $UMD$--space. ... More
The UMD constants of the summation operatorsJul 28 2004The UMD property of a Banach space is one of the most useful properties when one thinks about possible applications. This is in particular due to the boundedness of the vector-valued Hilbert transform for functions with values in such a space. Looking ... More
Electrical transport through single-molecule junctions: from molecular orbitals to conduction channelsOct 08 2001We present an atomistic theory of electronic transport through single organic molecules that reproduces the important features of the current-voltage characteristics observed in recent experiments. We trace these features to their origin in the electronic ... More
Evidence of columnar order in the fully frustrated transverse field Ising model on the square latticeJul 06 2012Nov 27 2012Using extensive classical and quantum Monte Carlo simulations, we investigate the ground-state phase diagram of the fully frustrated transverse field Ising model on the square lattice. We show that pure columnar order develops in the low-field phase above ... More
Vector-valued Walsh-Paley martingales and geometry of Banach spacesAug 01 1995The concept of Rademacher type $p$ ($1\leq p\leq2$) plays an important role in the local theory of Banach spaces. In \cite{mas88} Mascioni considers a weakening of this concept and shows that for a Banach space $X$ weak Rademacher type $p$ implies Rademacher ... More
Superreflexivity and J-convexity of Banach spacesOct 15 1997A Banach space X is superreflexive if each Banach space Y that is finitely representable in X is reflexive. Superreflexivity is known to be equivalent to J-convexity and to the non-existence of uniformly bounded factorizations of the summation operators ... More
Mean Convergence of Vector--valued Walsh SeriesOct 30 1992Given any Banach space $X$, let $L_2^X$ denote the Banach space of all measurable functions $f:[0,1]\to X$ for which ||f||_2:=(int_0^1 ||f(t)||^2 dt)^{1/2} is finite. We show that $X$ is a UMD--space (see \cite{BUR:1986}) if and only if \lim_n||f-S_n(f)||_2=0 ... More
Towards Generalizing Sensorimotor Control Across Weather ConditionsJul 25 2019The ability of deep learning models to generalize well across different scenarios depends primarily on the quality and quantity of annotated data. Labeling large amounts of data for all possible scenarios that a model may encounter would not be feasible; ... More
GN-Net: The Gauss-Newton Loss for Multi-Weather RelocalizationApr 26 2019Sep 09 2019Direct SLAM methods have shown exceptional performance on odometry tasks. However, they are susceptible to dynamic lighting and weather changes while also suffering from a bad initialization on large baselines. To overcome this, we propose GN-Net: a network ... More
New release of the ELODIE librarySep 09 2004Dec 14 2004We present ELODIE.3, an updated release of the ELODIE library originally published in Prugniel & Soubiran (2001). It is part of the spectrophotometric resources available in the HyperLeda database where the spectra can be visualized or downloaded in FITS ... More
UV-filtered fermionic Monte CarloSep 18 1998Sep 24 1998The short-range modes of the fermionic determinant can be absorbed in the gauge action using the loop expansion. The coefficients of this expansion and the zeroes of the polynomial approximating the remainder can be optimized by a simple, practical method. ... More
Entropy Production from Vacuum DecayOct 15 1993Using as dynamical variable the square of the radius of the Universe, we solve analytically the Einstein equations in the framework of Robertson-Walker models where a cosmological constant describing phenomenologically the vacuum energy decays into radiation. ... More
Correlations in mesoscopic magnetic systemsOct 17 2004The purpose of this proposal is to study the ferro/para phase transition in a mesoscopic Ising-like lattice and in particular demonstrate the existence of a negative magnetic susceptibility in the fixed magnetization ensemble. To this aim we will use ... More
Phase Transition in Small SystemOct 17 2004Everybody knows that when a liquid is heated, its temperature increases until the moment when it starts to boil. The increase in temperature then stops, all heat being used to transform the liquid into vapor. What is the microscopic origin of such a strange ... More
Soft Supersymmetry Breaking on the BraneMay 17 2004Nov 16 2004We consider the low energy description of five dimensional models of supergravity with boundaries comprising a vector multiplet and the universal hypermultiplet in the bulk. We analyse the spontaneous breaking of supersymmetry induced by the vacuum expectation ... More
The 4d effective action of 5d gauged supergravity with boundariesJul 05 2004We consider gauged five dimensional supergravity with boundaries and vector multiplets in the bulk. We analyse the zero modes of the BPS configurations preserving N=1 supergravity at low energy. We find the 4d low energy effective action involving the ... More
A Way Out of the Quantum TrapDec 28 1998Dec 31 1998We review Event Enhanced Quantum Theory (EEQT). In Section 1 we address the question "Is Quantum Theory the Last Word". In particular we respond to some of recent challenging staments of H.P. Stapp. We also discuss a possible future of the quantum paradigm ... More
Events and Piecewise Deterministic Dynamics in Event-Enhanced Quantum TheoryJun 13 1995We enhance the standard formalism of quantum theory to enable events. The concepts of experiment and of measurement are defined. Dynamics is given by Liouville's equation that couples quantum system to a classical one. It implies a unique Markov process ... More
Classical and Quantum IntertwineSep 21 1993Model interactions between classical and quantum systems are briefly discussed. These include: general measurement-like couplings, Stern-Gerlach experiment, model of a counter, quantum Zeno effect, SQUID-tank model.
Time-Dependent Hartree-Fock simulation of the expansion of abraded nucleiOct 13 1998A recent interpretation of the caloric curve based on the expansion of the abraded spectator nucleus is re-analysed in the framework of the Time-Dependent Hartree-Fock (TDHF) evolution. It is shown that the TDHF dynamics is more complex than a single ... More
Anisotropic mass ejection in binary mergersFeb 15 2005Jan 10 2006We investigate the mass loss from a rotationally distorted envelope following the early, rapid in-spiral of a companion star inside a common envelope. For initially wide, massive binaries (M_1+M_2=20M_{\odot}, P\sim 10 yr), the primary has a convective ... More
Exploring Urban Environments By Random WalksJan 21 2008A complex web of roads, walkways and public transport systems can hide areas of geographical isolation very difficult to analyze. Random walks are used to spot the structural details of urban fabric.
Random Walks Along the Streets and Canals in Compact Cities: Spectral analysis, Dynamical Modularity, Information, and Statistical MechanicsAug 15 2006Dec 08 2006Different models of random walks on the dual graphs of compact urban structures are considered. Analysis of access times between streets helps to detect the city modularity. The statistical mechanics approach to the ensembles of lazy random walkers is ... More
Intelligibility and First Passage Times In Complex Urban NetworksOct 04 2007Apr 21 2008Topology of urban environments can be represented by means of graphs. We explore the graph representations of several compact urban patterns by random walks. The expected time of recurrence and the expected first passage time to a node scales apparently ... More
Scaling and Universality in City Space Syntax: between Zipf and MatthewSep 27 2007We report about universality of rank-integration distributions of open spaces in city space syntax similar to the famous rank-size distributions of cities (Zipf's law). We also demonstrate that the degree of choice an open space represents for other spaces ... More
Finite-Dimensional CalculusSep 21 2007Jun 19 2009We discuss topics related to finite-dimensional calculus in the context of finite-dimensional quantum mechanics. The truncated Heisenberg-Weyl algebra is called a TAA algebra after Tekin, Aydin, and Arik who formulated it in terms of orthofermions. It ... More
Isabelle technology for the Archive of Formal ProofsMay 17 2019This is an overview of the Isabelle technology behind the Archive of Formal Proofs (AFP). Interactive development and quasi-interactive build jobs impose significant demands of scalability on the logic (usually Isabelle/HOL), on Isabelle/ML for mathematical ... More
A supplement to my paper on real and complex operator idealsOct 15 1997We show that the main problem left open in Wenzel: "Real and complex operator ideals" (wenzelopidls.latex), can be solved using the Banach spaces $Z_\alpha$ recently constructed by Kalton: "An elementary example of a Banach space not isomorphic to its ... More
Reversible Jump Metropolis Light Transport using Inverse MappingsApr 22 2017We study Markov Chain Monte Carlo (MCMC) methods operating in primary sample space and their interactions with multiple sampling techniques. We observe that incorporating the sampling technique into the state of the Markov Chain, as done in Multiplexed ... More
Hypercat : A Database for extragalactic astronomySep 29 1999Oct 01 1999The Hypercat Database is developed at Observatoire de Lyon and is distributed on the WEB through different mirrors in Europe. The goal of Hypercat is to gather data necessary for studying the evolution of galaxies (dynamics and stellar contains) and particularly ... More
Solutions of massive gravity theories in constant scalar invariant geometriesFeb 25 2013Jun 13 2013We solve massive gravity field equations in the framework of locally homogenous and vanishing scalar invariant (VSI) Lorentzian spacetimes, which in three dimensions are the building blocks of constant scalar invariant (CSI) spacetimes. At first, we provide ... More
Strategy for investments from Zipf law(s)Oct 22 2002We have applied the Zipf method to extract the $\zeta'$ exponent for seven financial indices (DAX, FTSE; DJIA, NASDAQ, S&P500; Hang-Seng and Nikkei 225), after having translated the signals into a text based on two letters. We follow considerations based ... More
Generalized (m,k)-Zipf law for fractional Brownian motion-like time series with or without effect of an additional linear trendSep 13 2002We have translated fractional Brownian motion (FBM) signals into a text based on two ''letters'', as if the signal fluctuations correspond to a constant stepsize random walk. We have applied the Zipf method to extract the $\zeta '$ exponent relating the ... More
Exponentially Small Couplings and the Hierarchy ProblemJun 05 1997We propose a stringy mechanism whereby a large hierarchy between symmetry breaking scales is generated. This mechanism is based upon the existence of a fifth dimension compactified on a segment. We focus on a simple supersymmetric model with one massless ... More
Spin-polarization and electronic properties of half-metallic Heusler alloys calculated from first-principlesOct 30 2006Half-metallic Heusler alloys are amongst the most promising materials for future magnetoelectronic applications. We review some recent results on the electronic properties of these compounds. The origin of the gap in these half-metallic alloys and its ... More
Massive Star Mergers: Induced Mixing and NucleosynthesisDec 03 2001We study the nucleosynthesis and the induced mixing during the merging of massive stars inside a common envelope. The systems of interest are close binaries, initially consisting of a massive red supergiant and a main-sequence companion of a few solar ... More
Chern-Simons Theory with Sources and Dynamical Quantum Groups I: Canonical Analysis and Algebraic StructuresMay 26 2005We study the quantization of Chern-Simons theory with group $G$ coupled to dynamical sources. We first study the dynamics of Chern-Simons sources in the Hamiltonian framework. The gauge group of this system is reduced to the Cartan subgroup of $G.$ We ... More
A Wilson-Yukawa model with a chiral spectrum in 2DOct 29 1997We summarize our recent study of the fermion spectrum in a fermion-scalar 2D model with a chiral $U(1)_L \times U(1)_R$ global symmetry. This model is obtained from a two-cutoff lattice formulation of a 2D U(1) chiral gauge theory, in the limit of zero ... More
A Wilson-Yukawa model with undoubled chiral fermions in 2DJun 26 1997We consider the fermion spectrum in the strong coupling vortex phase of a lattice fermion-scalar model with a global $U(1)_L\times U(1)_R$, in 2D, in the context of a recently proposed two-cutoff lattice formulation. The fermion doublers are made massive ... More
Limits to Poisson's ratio in isotropic materialsSep 25 2009A long-standing question is why Poisson's ratio v nearly always exceeds 0.2 for isotropic materials, whereas classical elasticity predicts v to be between -1 to 1/2. We show that the roots of quadratic relations from classical elasticity divide v into ... More
Decoherence, Entanglement and Irreversibility in Quantum Dynamical Systems with Few Degrees of FreedomJun 05 2008Feb 18 2009This review summarizes and amplifies on recent investigations of coupled quantum dynamical systems in the short wavelength limit. We formulate and attempt to answer three fundamental questions: (i) What drives a dynamical quantum system to behave classically ... More
Lyapunov Generation of Entanglement and the Correspondence PrincipleOct 20 2005We show how a classically vanishing interaction generates entanglement between two initially nonentangled particles, without affecting their classical dynamics. For chaotic dynamics, the rate of entanglement is shown to saturate at the Lyapunov exponent ... More
Search for Cosmic-Ray Antiparticles with Balloon-borne and Space-borne ExperimentsMar 11 2009Sep 15 2009This thesis discusses two different approaches for the measurement of cosmic-ray antiparticles in the GeV to TeV energy range. The first part of this thesis discusses the prospects of antiparticle flux measurements with the proposed PEBS detector. The ... More
The "Cameo Principle" and the Origin of Scale-Free Graphs in Social NetworksFeb 28 2003Oct 21 2003We formulate a simple edge generation rule based on an inverse like mass action principle for random graphs over a structured vertex set. We show that under very weak assumptions on the structure generating distribution we obtain a scale free distribution ... More
Effectively classical quantum states for open systemsMar 22 2000Notions of robust and "classical" states for an open quantum system are introduced and discussed in the framework of the isometric-sweeping decomposition of trace class operators. Using the predictability sieve proposed by Zurek, ``quasi-classical'' states ... More
Time of Events in Quantum TheoryFeb 13 1996Feb 20 1996We enhance elementary quantum mechanics with three simple postulates that enable us to define time observable. We discuss shortly justification of the new postulates and illustrate the concept with the detailed analysis of a delta function counter.
Strongly Coupled Quantum and Classical Systems and Zeno's EffectSep 21 1993A model interaction between a two-state quantum system and a classical switching device is analysed and shown to lead to the quantum Zeno effect for large values of the coupling constant k . A minimal piecewise deterministic random process compatible ... More
Band-by-band decomposition of the Born effective chargesNov 13 2000The Born effective charge, Z*, that describes the polarization created by collective atomic displacements, can be computed from first-principles following different techniques. We establish the connections existing between these different formulations, ... More
First-principles computation of the Born effective charges and their band-by-band decompositionMay 01 1998The Born effective charge, Z*, that describes the polarization created by collective atomic displacements, can be computed from first-principles by different techniques. Its band-by-band decomposition appeared recently as a powerful tool for the microscopic ... More
On smooth surfaces in projective four-space lying on quartic hypersurfaces with isolated singularitiesMay 13 1999We prove that a smooth surface, non of general type, in projective four-space, which lies on a quartic hypersurface with isolated singularities has degree at most 27 (in fact we prove a slightly more general result).
Comparative Study of Cities as Complex NetworksSep 27 2007Degree distributions of graph representations for compact urban patterns are scale-dependent. Therefore, the degree statistics alone does not give us the enough information to reach a qualified conclusion on the structure of urban spatial networks. We ... More
Nonlinear Diffusion Through Large Complex Networks Containing Regular SubgraphsJun 30 2006Dec 08 2006Transport through generalized trees is considered. Trees contain the simple nodes and supernodes, either well-structured regular subgraphs or those with many triangles. We observe a superdiffusion for the highly connected nodes while it is Brownian for ... More
Complex Networks in and beyond PhysicsJul 23 2007Physicists study a wide variety of phenomena creating new interdisciplinary research fields by applying theories and methods originally developed in physics in order to solve problems in economics, social science, biology, medicine, technology, etc. In ... More
The MultiBoson methodMar 23 1999This review describes the multiboson algorithm for Monte Carlo simulations of lattice QCD, including its static and dynamical aspects, and presents a comparison with Hybrid Monte Carlo.
Godel metric as a squashed anti-de Sitter geometryApr 09 1998Jun 30 1998We show that the non flat factor of the Godel metric belongs to a one parameter family of 2+1 dimensional geometries that also includes the anti-de Sitter metric. The elements of this family allow a generalization a la Kaluza-Klein of the usual 3+1 dimensional ... More
Towards a controlled study of the QCD critical pointJul 05 2008The phase diagram of QCD, as a function of temperature T and quark chemical potential mu, may contain a critical point (mu_E,T_E) whose non-perturbative nature makes it a natural object of lattice studies. However, the sign problem prevents the application ... More
Comment on "Negative heat capacities and first order phase transitions in nuclei" by L.G. Moretto et alApr 17 2003In a recent paper L.G. Moretto et al [nucl-th/0208024] claim that the negative heat capacities presented in our previously published paper \cite{PRL2000} are "artifacts" coming from the use of periodic boundary conditions in the Lattice-Gas calculations. ... More
Spin densities in the transverse plane and generalized transversity distributionsApr 20 2005We show how generalized quark distributions in the nucleon describe the density of polarized quarks in the impact parameter plane, both for longitudinal and transverse polarization of the quark and the nucleon. This density representation entails positivity ... More
Angular Momentum Loss in Low Mass Accretion DisksFeb 03 1993We review mechanisms for the transport of angular momentum in accretion disks that are low mass, in the sense that the gravitational forces produced by the material in these disks has a negligible effect on disk dynamics. There is no established consensus ... More
An update on Archeops: flights and data productsJul 31 2003Archeops is a balloon-borne instrument dedicated to measuring CMB temperature anisotropies at high resolution over a large fraction of sky. We present the Archeops flights and data products, Archeops results, and the future use of Archeops data for multi-experiment ... More
A review of the electronic and magnetic properties of tetrahedrally bonded half-metallic ferromagnetsNov 01 2006The emergence of the field of spintronics brought half-metallic ferromagnets to the center of scientific research. A lot of interest was focused on newly created transition-metal pnictides (such as CrAs) and chalcogenides (such as CrTe) in the metastable ... More
Open supermembranes in eleven dimensionsApr 24 1997We consider open supermembranes in an eleven dimensional background. We show that, in a flat space-time, the world-volume action is kappa-symmetric and has global space-time supersymmetry if space-time has even dimensional topological defects where the ... More
Quantum Mechanics with Event DynamicsJun 12 1995Jun 14 1995Event generating algorithm corresponding to a linear master equation of Lindblad's type is described and illustrated on two examples: that of a particle detector and of a fuzzy clock. Relation to other approaches to foundations of quantum theory and to ... More
From Quantum Probabilities to Classical FactsNov 16 1993Nov 25 1993Model interactions between classical and quantum systems are briefly reviewed. These include: general measurement - like couplings, Stern-Gerlach experiment, model of a counter, quantum Zeno effect, piecewise deterministic Markov processes and meaning ... More
Irreducible representations of the quantum analogue of SU(2)Apr 10 2003We give the complete set of irreducible representations of U(SU(2))_q when q is a m-th root of unity. In particular we show that their dimensions are less or equal to m. Some of them are not highest weight representations.
Do SN 2002cx-like and SN Ia-CSM objects share the same origin?Dec 31 2017May 24 2018SN 2002cx-like and SN Ia-CSM objects show similar early spectra and both belong to a young stellar population, suggesting that they could share the same progenitor origin. Adopting the framework of the common-envelope-wind (CEW) model developed in \citet{MENGXC17}, ... More
Probabilistic Embedding Of Discrete Sets As Continuous Metric SpacesApr 28 2008Any symmetric affinity function $w: V\times V \to \mathbb{R}_+$ defined on a discrete set $V$ induces Euclidean space structure on $V$. In particular, an undirected graph specified by an affinity (or adjacency) matrix can be considered as a metric topological ... More
Transport Networks Revisited: Why Dual Graphs?Oct 29 2007Deterministic equilibrium flows in transport networks can be investigated by means of Markov's processes defined on the dual graph representations of the network. Sustained movement patterns are generated by a subset of automorphisms of the graph spanning ... More
Ghetto of Venice: Access to the Target Node and the Random Target Access TimeOct 16 2007Random walks defined on undirected graphs assign the absolute scores to all nodes based on the quality of path they provide for random walkers. In city space syntax, the notion of segregation acquires a statistical interpretation with respect to random ... More
Scale-free Segregation in Transport NetworksOct 08 2007Oct 31 2007Every route of a transport network approaching equilibrium can be represented by a vector of Euclidean space which length quantifies its segregation from the rest of the graph. We have empirically observed that the distribution of lengths over the edge ... More