Results for "Rasmus Ischebeck"

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Generation and Measurement of Sub-Micrometer Relativistic Electron BeamsApr 11 2018The generation of low-emittance electron beams has received significant interest in recent years. Driven by the requirements of X-ray free electron lasers, the emittance of photocathode injectors has been reduced significantly, with a corresponding increase ... More
Adaptive and Safe Bayesian Optimization in High Dimensions via One-Dimensional SubspacesFeb 08 2019Bayesian optimization is known to be difficult to scale to high dimensions, because the acquisition step requires solving a non-convex optimization problem in the same search space. In order to scale the method and keep its benefits, we propose an algorithm ... More
Compressed Matrix MultiplicationAug 05 2011Nov 28 2011Motivated by the problems of computing sample covariance matrices, and of transforming a collection of vectors to a basis where they are sparse, we present a simple algorithm that computes an approximation of the product of two n-by-n real matrices A ... More
Exploring the Galaxy using space probesJan 09 2007Apr 23 2007This paper investigates the possible use of space probes to explore the Milky Way, as a means both of finding life elsewhere in the Galaxy and as finding an answer to the Fermi paradox. I simulate exploration of the Galaxy by first examining how long ... More
Signatures of long-lived colored sparticlesSep 28 2009In this paper an updated Geant4 simulation toolkit is presented describing the interactions in matter of heavy hadrons containing long-lived squarks and gluinos. Generic signatures are derived that are applicable at the Large Hadron Collider, and the ... More
Cuntz Splice invariance for purely infinite graph algebrasOct 22 2015Nov 30 2015We show that the Cuntz Splice preserves the stable isomorphism class of a purely infinite graph C*-algebra with finitely many ideals.
The mapping class group orbit of a multicurveFeb 21 2008Mar 16 2009Given a set equipped with a transitive action of a group, we define the notion of an almost invariant coloring of the set. We consider the mapping class group orbit of a multicurve on a compact surface, and prove that in the case of genus at least two, ... More
Bibliometric author evaluation through linear regression on the coauthor networkApr 13 2015The rising trend of coauthored academic works obscures the credit assignment that is the basis for decisions of funding and career advancements. In this paper, a simple model based on the assumption of an unvarying "author ability" is introduced. With ... More
Extensions of Cuntz-Krieger algebrasNov 30 2015We show that a C*-algebra "looking like" a Cuntz-Krieger algebra is a Cuntz-Krieger algebra. This implies that, in an appropriate sense, the class of Cuntz-Krieger algebras is closed under extensions of real rank zero.
Kirchberg X-algebras with real rank zero and intermediate cancellationJan 28 2013Nov 04 2013A universal coefficient theorem is proved for C*-algebras over an arbitrary finite T_0-space X which have vanishing boundary maps. Under bootstrap assumptions, this leads to a complete classification of unital/stable real-rank-zero Kirchberg X-algebras ... More
Projective dimension in filtrated K-theoryOct 17 2012Jan 11 2013Under mild assumptions, we characterise modules with projective resolutions of length n in the target category of filtrated K-theory over a finite topological space in terms of two conditions involving certain Tor-groups. We show that the filtrated K-theory ... More
A computation of H^1(Γ, H_1(Σ))Feb 23 2011Let \Sigma = \Sigma _{g,1} be a compact surface of genus g at least 3 with one boundary component, \Gamma its mapping class group and M = H_1(\Sigma , Z) the first integral homology of \Sigma . Using that \Gamma is generated by the Dehn twists in a collection ... More
Non-advective rate of curved step advance on smooth crystal face under steady-state conditionsJan 13 2009Apr 02 2014For low to moderate supersaturations, crystals grow by lateral build-up of new layers. The edges of the layers are known as "steps". We consider the rate of step advance on a flat crystal face under the influence of bulk diffusion in the complete absence ... More
Classification of certain continuous fields of Kirchberg algebrasAug 09 2013Dec 19 2013We show that the K-theory cosheaf is a complete invariant for separable continuous fields with vanishing boundary maps over a finite-dimensional compact metrizable topological space whose fibers are stable Kirchberg algebras with rational K-theory groups ... More
A New Data Layout For Set Intersection on GPUsFeb 04 2011Set intersection is the core in a variety of problems, e.g. frequent itemset mining and sparse boolean matrix multiplication. It is well-known that large speed gains can, for some computational problems, be obtained by using a graphics processing unit ... More
CoveringLSH: Locality-sensitive Hashing without False NegativesJul 12 2015Jan 07 2016We consider a new construction of locality-sensitive hash functions for Hamming space that is \emph{covering} in the sense that is it guaranteed to produce a collision for every pair of vectors within a given radius $r$. The construction is \emph{efficient} ... More
Homotopy-theoretic E-theory and n-orderFeb 27 2013May 13 2013The bootstrap category in E-theory for C*-algebras over a finite space X is embedded into the homotopy category of certain diagrams of K-module spectra. Therefore it has infinite n-order for every n. The same holds for the bootstrap category in G-equivariant ... More
Better size estimation for sparse matrix productsJun 21 2010Feb 22 2011We consider the problem of doing fast and reliable estimation of the number of non-zero entries in a sparse boolean matrix product. This problem has applications in databases and computer algebra. Let n denote the total number of non-zero entries in the ... More
Consistent Subset SamplingApr 18 2014Consistent sampling is a technique for specifying, in small space, a subset $S$ of a potentially large universe $U$ such that the elements in $S$ satisfy a suitably chosen sampling condition. Given a subset $\mathcal{I}\subseteq U$ it should be possible ... More
Gaussian-Charge Polarizable Interaction Potential for Carbon DioxideAug 23 2010Oct 23 2010A number of simple pair interaction potentials of the carbon dioxide molecule are investigated and found to underestimate the magnitude of the second virial coefficient in the temperature interval 220 K to 448 K by up to 20%. Also the third virial coefficient ... More
Succinct Data Structures for Retrieval and Approximate MembershipMar 26 2008The retrieval problem is the problem of associating data with keys in a set. Formally, the data structure must store a function f: U ->{0,1}^r that has specified values on the elements of a given set S, a subset of U, |S|=n, but may have any value on ... More
One-parameter continuous fields of Kirchberg algebras with rational K-theoryJun 07 2013Nov 04 2013We show that separable continuous fields over the unit interval whose fibers are stable Kirchberg algebras that satisfy the universal coefficient theorem in KK-theory and have rational K-theory groups are classified up to isomorphism by filtrated K-theory. ... More
Energy efficiency studies for dual-grating dielectric laser-driven acceleratorsDec 13 2017Dielectric laser-driven accelerators (DLAs) can provide high accelerating gradients in the GV/m range due to their having higher breakdown thresholds than metals, which opens the way for the miniaturization of the next generation of particle accelerator ... More
On Finding Similar Items in a Stream of TransactionsOct 12 2010While there has been a lot of work on finding frequent itemsets in transaction data streams, none of these solve the problem of finding similar pairs according to standard similarity measures. This paper is a first attempt at dealing with this, arguably ... More
On Finding Frequent Patterns in Event SequencesOct 12 2010Given a directed acyclic graph with labeled vertices, we consider the problem of finding the most common label sequences ("traces") among all paths in the graph (of some maximum length m). Since the number of paths can be huge, we propose novel algorithms ... More
Numerical Valuation of Derivatives in High-Dimensional Settings via PDE ExpansionsSep 10 2012Oct 03 2013In this article, we propose a new numerical approach to high-dimensional partial differential equations (PDEs) arising in the valuation of exotic derivative securities. The proposed method is extended from Reisinger and Wittum (2007) and uses principal ... More
The scenario-based generalization of radiation therapy marginsOct 09 2015We give a scenario-based treatment plan optimization formulation that is equivalent to planning with geometric margins if the scenario doses are calculated using the static dose cloud approximation. If the scenario doses are instead calculated more accurately, ... More
Joint Coordinated Precoding and Discrete Rate Selection in Multicell MIMO NetworksApr 19 2016Many practical wireless communications systems select their transmit rate from a finite set of modulation and coding schemes, which correspond to a set of discrete rates. In this paper, we therefore formulate a joint coordinated precoding and discrete ... More
Instanton-dyon Ensemble with two Dynamical Quarks: the Chiral Symmetry BreakingNov 06 2015Apr 29 2016This is the second paper of the series aimed at understanding the ensemble of instanton-dyons, now with two flavors of light dynamical quarks. The partition function is appended by the fermionic factor, $(det T)^{N_f}$ and Dirac eigenvalue spectra at ... More
Interacting Ensemble of the Instanton-dyons and Deconfinement Phase Transition in the SU(2) Gauge TheoryApr 13 2015Instanton-dyons, also known as instanton-monopoles or instanton-quarks, are topological constituents of the instantons at nonzero temperature and holonomy. We perform numerical simulations of the ensemble of interacting dyons for the SU(2) pure gauge ... More
Classical interactions of the instanton-dyons with antidyonsAug 27 2014Apr 29 2016Instanton-dyons, also known as instanton-monopoles or instanton-quarks, are topological constituents of the instantons at nonzero temperature and nonzero expectation value of $A_4$. While the interaction between instanton-dyons has been calculated to ... More
A study of the population of LMXBs in the bulge of M31Oct 21 2006Mar 21 2007The purpose of this study is to explore the population of X-ray point sources in the bulge of M31, with the primary goal to contrast properties of various subpopulations, such as persistent and transient sources, primordial LMXBs and dynamically formed ... More
Universal coefficient theorems for C*-algebras over finite topological spacesJan 29 2011Apr 07 2011We determine the class of finite T_0-spaces allowing for a universal coefficient theorem computing equivariant KK-theory by filtrated K-theory.
A more general method to classify up to equivariant KK-equivalenceMay 26 2014Nov 30 2015Using a homological invariant together with an obstruction class in a certain Ext^2-group, we may classify objects in triangulated categories that have projective resolutions of length two. This invariant gives strong classification results for actions ... More
Opportunities in Machine Learning for Particle AcceleratorsNov 07 2018Machine learning (ML) is a subfield of artificial intelligence. The term applies broadly to a collection of computational algorithms and techniques that train systems from raw data rather than a priori models. ML techniques are now technologically mature ... More
Simple Multi-Party Set ReconciliationNov 08 2013Apr 22 2015As users migrate information to cloud storage, many distributed cloud-based services use multiple loosely consistent replicas of user information to avoid the high overhead of more tightly coupled synchronization. Periodically, the information must be ... More
Instanton-dyon Ensembles III: Exotic Quark FlavorsMay 24 2016Jun 15 2016"Exotic quarks" in the title refers to a modification of quark periodicity condition on the thermal circle by introduction of some phases -- known also as "flavor holonomies" -- different quark flavors. These phases provide a valuable tool, to be used ... More
New Evidence of an Enhanced Greenhouse EffectJun 24 2011The state of earth's climate is constrained by well-known physical principles such as energy balance and the conservation of energy. Increased greenhouse gas concentrations affect the atmospheric optical depth, and physical consistency implies that changes ... More
Note on the physical basis of spatially resolved thermodynamic functionsApr 25 2016The spatial resolution of thermodynamic functions, exemplified by the entropy, is discussed. A physical definition of the spatial resolution based on a spatial analogy of the partial molar entropy is advocated. It is shown that neither the grid cell theory ... More
Modification of the Gay-Berne potential for improved accuracy and speedMay 07 2012May 27 2012A modification of the Gay-Berne potential is proposed which is about 10% to 20% more speed efficient (that is, the original potential runs 15% to 25% slower, depending on architecture) and statistically more accurate in reproducing the energy of interaction ... More
On Finding Frequent Patterns in Directed Acyclic GraphsMay 03 2010Given a directed acyclic graph with labeled vertices, we consider the problem of finding the most common label sequences ("traces") among all paths in the graph (of some maximum length m). Since the number of paths can be huge, we propose novel algorithms ... More
Necessary and sufficient conditions for Pareto efficiency in robust multiobjective optimizationAug 21 2013Nov 27 2014We provide necessary and sufficient conditions for robust efficiency to multiobjective optimization problems with uncertain objectives. These conditions state that a solution is robust efficient (under minimization) if it is optimal to a strongly increasing ... More
The dynamical formation of LMXBs in dense stellar environments: globular clusters and the inner bulge of M31Feb 21 2007Sep 21 2007The radial distribution of luminous L_X>10^{36} erg/s X-ray point sources in the bulge of M31 is investigated using archival Chandra observations. We find a significant increase of the specific frequency of X-ray sources, per unit stellar mass, within ... More
Error analysis of truncated expansion solutions to high-dimensional parabolic PDEsMay 18 2015Nov 07 2016We study an expansion method for high-dimensional parabolic PDEs which constructs accurate approximate solutions by decomposition into solutions to lower-dimensional PDEs, and which is particularly effective if there are a low number of dominant principal ... More
Error analysis of truncated expansion solutions to high-dimensional parabolic PDEsMay 18 2015Apr 22 2016We study an expansion method for high-dimensional parabolic PDEs which guarantees accurate approximate solutions in polynomial complexity in the dimension and which is particularly effective if there are a low number of dominant principal components. ... More
Scalability and Total Recall with Fast CoveringLSHFeb 08 2016Aug 19 2016Locality-sensitive hashing (LSH) has emerged as the dominant algorithmic technique for similarity search with strong performance guarantees in high-dimensional spaces. A drawback of traditional LSH schemes is that they may have \emph{false negatives}, ... More
The Input/Output Complexity of Triangle EnumerationDec 03 2013Mar 22 2014We consider the well-known problem of enumerating all triangles of an undirected graph. Our focus is on determining the input/output (I/O) complexity of this problem. Let $E$ be the number of edges, $M<E$ the size of internal memory, and $B$ the block ... More
Microscopic Spectral Density of the Wilson Dirac Operator for One FlavorOct 26 2011We consider the effect of a non-zero lattice spacing on the low-energy effective theory of Wilson fermions with one flavor. Analytical results are given for both the chiral condensate and the microscopic spectral density of the Wilson Dirac operator. ... More
An Updated Description of Heavy-Hadron Interactions in Geant-4Aug 13 2009Sep 01 2009Exotic stable massive particles (SMP) are proposed in a number of scenarios of physics beyond the Standard Model. It is important that LHC experiments are able both to detect and extract the quantum numbers of any SMP with masses around the TeV scale. ... More
Interactions of Coloured Heavy Stable Particles in MatterDec 13 2006In this paper we present a physics model for the interactions of stable heavy hadrons containing a heavy parton with matter. The model presented is a natural continuation of the work started in hep-ex/0404001. However, changes and generalisations have ... More
Perturbation method to calculate the density of statesJul 16 2012Dec 19 2012Monte Carlo switching moves ("perturbations") are defined between two or more classical Hamiltonians sharing a common ground-state energy. The ratio of the density of states (DOS) of one system to that of another is related to the ensemble averages of ... More
On the Physical Cluster of Nucleation Theory: Generalized Hill ClusterNov 12 2011The physical cluster originally conceived by Hill (J. Chem. Phys, 23, 617) is generalized for the case $N > 2$ in a novel way. Contrary to Hill's pairwise generalization, this definition assures that all constituent molecules of the cluster have insufficient ... More
Finding Associations and Computing Similarity via Biased Pair SamplingOct 01 2009Feb 17 2010This version is ***superseded*** by a full version that can be found at http://www.itu.dk/people/pagh/papers/mining-jour.pdf, which contains stronger theoretical results and fixes a mistake in the reporting of experiments. Abstract: Sampling-based methods ... More
Approximate Gaussian Elimination for Laplacians: Fast, Sparse, and SimpleMay 08 2016We show how to perform sparse approximate Gaussian elimination for Laplacian matrices. We present a simple, nearly linear time algorithm that approximates a Laplacian by a matrix with a sparse Cholesky factorization, the version of Gaussian elimination ... More
The Input/Output Complexity of Sparse Matrix MultiplicationMar 14 2014We consider the problem of multiplying sparse matrices (over a semiring) where the number of non-zero entries is larger than main memory. In the classical paper of Hong and Kung (STOC '81) it was shown that to compute a product of dense $U \times U$ matrices, ... More
Some recent developments in statistics for spatial point patternsSep 04 2016This paper reviews developments in statistics for spatial point processes obtained within roughly the last decade. These developments include new classes of spatial point process models such as determinantal point processes, models incorporating both ... More
Validating a physics-based back-of-the-envelope climate model with state-of-the-art dataJan 07 2013Mar 04 2013An old conceptual physics-based back-of-the-envelope model for greenhouse effect is revisited and validated against state-of-the-art reanalyses. Untraditional diagnostics show a physically consistent picture, for which the state of earth's climate is ... More
A parametric study of the meso-scale modelling of concrete subjected to cyclic compressionNov 08 2008The present parametric study deals with the meso-scale modelling of concrete subjected to cyclic compression, which exhibits hysteresis loops during unloading and reloading. Concrete is idealised as a two-dimensional three-phase composite made of aggregates, ... More
Comment on "Calculation of microcanonical entropy differences from configurational averages"Mar 25 2013May 06 2013We introduce a simple improvement on the method to calculate equilibrium entropy differences between classical energy levels proposed by Davis (S. Davis, Phys. Rev. E, 050101, 2011). We demonstrate that the modification is superior to the original whenever ... More
Vertical partitioning of relational OLTP databases using integer programmingNov 09 2009Feb 16 2010A way to optimize performance of relational row store databases is to reduce the row widths by vertically partitioning tables into table fractions in order to minimize the number of irrelevant columns/attributes read by each transaction. This paper considers ... More
Discovery of the progenitor of the type Ia supernova 2007onFeb 14 2008Type Ia supernovae are exploding stars that are used to measure the accelerated expansion of the Universe and are responsible for most of the iron ever produced. Although there is general agreement that the exploding star is a white dwarf in a binary ... More
Association Rule Mining using Maximum EntropyJan 09 2015Recommendations based on behavioral data may be faced with ambiguous statistical evidence. We consider the case of association rules, relevant e.g.~for query and product recommendations. For example: Suppose that a customer belongs to categories A and ... More
Error-prone polymerase activity causes multinucleotide mutations in humansDec 05 2013Apr 29 2014About 2% of human genetic polymorphisms have been hypothesized to arise via multinucleotide mutations (MNMs), complex events that generate SNPs at multiple sites in a single generation. MNMs have the potential to accelerate the pace at which single genes ... More
Generating k-independent variables in constant timeAug 09 2014The generation of pseudorandom elements over finite fields is fundamental to the time, space and randomness complexity of randomized algorithms and data structures. We consider the problem of generating $k$-independent random values over a finite field ... More
Range-efficient consistent sampling and locality-sensitive hashing for polygonsJan 19 2017Sep 22 2017Locality-sensitive hashing (LSH) is a fundamental technique for similarity search and similarity estimation in high-dimensional spaces. The basic idea is that similar objects should produce hash collisions with probability significantly larger than objects ... More
Reliable Reception of Wireless Metering Data with Protocol CodingMay 21 2013Stationary collectors reading wireless, battery powered smart meters, often operate in harsh channel conditions to cut network installation cost to a minimum, challenging the individual link to each meter. The desired performance measure is reliable reception ... More
Colorful Triangle Counting and a MapReduce ImplementationMar 31 2011In this note we introduce a new randomized algorithm for counting triangles in graphs. We show that under mild conditions, the estimate of our algorithm is strongly concentrated around the true number of triangles. Specifically, if $p \geq \max{(\frac{\Delta ... More
Chaotic flavor evolution in an interacting neutrino gasApr 15 2014Neutrino-neutrino refraction can lead to non-periodic flavor oscillations in dense neutrino gases, and it has been hypothesized that some solutions are chaotic in nature. This is of particular interest in the case of neutrino emission from core-collapse ... More
I/O-Efficient Data Structures for Colored Range and Prefix ReportingApr 15 2011Motivated by information retrieval applications, we consider the one-dimensional colored range reporting problem in rank space. The goal is to build a static data structure for sets C_1,...,C_m \subseteq {1,...,sigma} that supports queries of the kind: ... More
The maximum theoretical performance of unconcentrated solar photovoltaic and thermoelectric generator systemsSep 18 2017Nov 14 2017The maximum efficiency for photovoltaic (PV) and thermoelectric generator (TEG) systems without concentration is investigated. Both a combined system where the TEG is mounted directly on the back of the PV and a tandem system where the incoming sunlight ... More
Linear Abadi and Plotkin LogicNov 01 2006Nov 04 2006We present a formalization of a version of Abadi and Plotkin's logic for parametricity for a polymorphic dual intuitionistic/linear type theory with fixed points, and show, following Plotkin's suggestions, that it can be used to define a wide collection ... More
Linear usage of stateMar 06 2014Mar 30 2014We investigate the phenomenon that "every monad is a linear state monad". We do this by studying a fully-complete state-passing translation from an impure call-by-value language to a new linear type theory: the enriched call-by-value calculus. The results ... More
Strategy complexity of finite-horizon Markov decision processes and simple stochastic gamesSep 17 2012Markov decision processes (MDPs) and simple stochastic games (SSGs) provide a rich mathematical framework to study many important problems related to probabilistic systems. MDPs and SSGs with finite-horizon objectives, where the goal is to maximize the ... More
Relational Parametricity for Computational EffectsJun 30 2009Aug 09 2009According to Strachey, a polymorphic program is parametric if it applies a uniform algorithm independently of the type instantiations at which it is applied. The notion of relational parametricity, introduced by Reynolds, is one possible mathematical ... More
Degree one cohomology with twisted coefficients of the mapping class groupOct 11 2007Let $\Gamma$ be the mapping class group of an oriented surface $\Sigma$ of genus g with r boundary components. We prove that the first cohomology group $H^1(\Gamma, O(M_{SL(2, C)})^*)$ is non-trivial, where the coefficient module is the dual of the space ... More
Edge Elimination in TSP InstancesFeb 28 2014The Traveling Salesman Problem is one of the best studied NP-hard problems in combinatorial optimization. Powerful methods have been developed over the last 60 years to find optimum solutions to large TSP instances. The largest TSP instance so far that ... More
Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictionsJul 26 2016We discuss the parameter space reach of future experiments searching for heavy neutral leptons (HNLs) at the GeV scale in terms of neutrino mass models with three HNL generations. We focus on two classes of models: Generic assumptions (such as random ... More
Qualitative Analysis of Concurrent Mean-payoff GamesSep 18 2014We consider concurrent games played by two-players on a finite-state graph, where in every round the players simultaneously choose a move, and the current state along with the joint moves determine the successor state. We study a fundamental objective, ... More
Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictionsJul 26 2016Nov 21 2016We discuss the parameter space reach of future experiments searching for heavy neutral leptons (HNLs) at the GeV scale in terms of neutrino mass models with three HNL generations. We focus on two classes of models: Generic assumptions (such as random ... More
Cohomology of mapping class groups and the abelian moduli spaceMar 24 2009We consider a surface $\Sigma$ of genus $g \geq 3$, either closed or with exactly one puncture. The mapping class group $\Gamma$ of $\Sigma$ acts symplectically on the abelian moduli space $M = \Hom(\pi_1(\Sigma), U(1)) = \Hom(H_1(\Sigma),U(1))$, and ... More
Galactic distribution of merging neutron stars and black holes - prospects for short GRB progenitors and LIGO/VIRGOMar 11 2003We have performed detailed population synthesis on a large number (20 million) of binary systems in order to investigate the properties of massive double degenerate binaries. We have included new important results in our input physics in order to obtain ... More
The Complexity of Ergodic Mean-payoff GamesApr 23 2014We study two-player (zero-sum) concurrent mean-payoff games played on a finite-state graph. We focus on the important sub-class of ergodic games where all states are visited infinitely often with probability 1. The algorithmic study of ergodic games was ... More
Secondary Indexing in One Dimension: Beyond B-trees and Bitmap IndexesNov 18 2008Let S be a finite, ordered alphabet, and let x = x_1 x_2 ... x_n be a string over S. A "secondary index" for x answers alphabet range queries of the form: Given a range [a_l,a_r] over S, return the set I_{[a_l;a_r]} = {i |x_i \in [a_l; a_r]}. Secondary ... More
The Value 1 Problem Under Finite-memory Strategies for Concurrent Mean-payoff GamesSep 23 2014Oct 01 2014We consider concurrent mean-payoff games, a very well-studied class of two-player (player 1 vs player 2) zero-sum games on finite-state graphs where every transition is assigned a reward between 0 and 1, and the payoff function is the long-run average ... More
Thresholds for Extreme OrientabilityFeb 06 2012Feb 15 2012Multiple-choice load balancing has been a topic of intense study since the seminal paper of Azar, Broder, Karlin, and Upfal. Questions in this area can be phrased in terms of orientations of a graph, or more generally a k-uniform random hypergraph. A ... More
The first cohomology of the mapping class group with coefficients in algebraic functions on the SL(2, C) moduli spaceFeb 29 2008Consider a compact surface of genus at least two. We prove that the first cohomology group of the mapping class group with coefficients in the space of algebraic functions on the SL(2, C) moduli space vanishes.
Can active-sterile neutrino oscillations lead to chaotic behavior of the cosmological lepton asymmetry?Feb 28 2013While the cosmic baryon asymmetry has been measured at high accuracy to be 6.1*10^-10, a corresponding lepton asymmetry could be as large as 10^-2 if it hides in the neutrino sector. It has been known for some time that a large asymmetry can be generated ... More
Denoising autoencoder with modulated lateral connections learns invariant representations of natural imagesDec 22 2014Mar 31 2015Suitable lateral connections between encoder and decoder are shown to allow higher layers of a denoising autoencoder (dAE) to focus on invariant representations. In regular autoencoders, detailed information needs to be carried through the highest layers ... More
Adaptive Data Collection Mechanisms for Smart Monitoring of Distribution GridsAug 22 2016Smart Grid systems not only transport electric energy but also information which will be active part of the electricity supply system. This has led to the introduction of intelligent components on all layers of the electrical grid in power generation, ... More
Linear Probing with Constant IndependenceDec 08 2006Hashing with linear probing dates back to the 1950s, and is among the most studied algorithms. In recent years it has become one of the most important hash table organizations since it uses the cache of modern computers very well. Unfortunately, previous ... More
The complexity of interior point methods for solving discounted turn-based stochastic gamesApr 06 2013Dec 17 2014We study the problem of solving discounted, two player, turn based, stochastic games (2TBSGs). Jurdzinski and Savani showed that 2TBSGs with deterministic transitions can be reduced to solving $P$-matrix linear complementarity problems (LCPs). We show ... More
An operational definition of the 100 second blocking temperature T$_{\mathrm{B}100}$ for single molecule magnetsJun 11 2015An important figure of merit for the performance of single-molecule magnets (SMMs) is the 100 s blocking temperature T$_{\mathrm{B}100}$. It is the temperature at which the remanence or zero field relaxation time is 100 seconds. If there is more than ... More
Quasiparticle scattering rate in a strongly polarised Fermi mixtureFeb 03 2015We analyse the scattering rate of an impurity atom in a Fermi sea as a function of momentum and temperature in the BCS-BEC crossover. The cross section is calculated using a microscopic multichannel theory for the Feshbach resonance scattering, including ... More
Quasi-likelihood for Spatial Point ProcessesMar 01 2013Fitting regression models for intensity functions of spatial point processes is of great interest in ecological and epidemiological studies of association between spatially referenced events and geographical or environmental covariates. When Cox or cluster ... More
Generic Global Constraints based on MDDsFeb 28 2007Constraint Programming (CP) has been successfully applied to both constraint satisfaction and constraint optimization problems. A wide variety of specialized global constraints provide critical assistance in achieving a good model that can take advantage ... More
The K-theoretical range of Cuntz-Krieger algebrasSep 27 2013Jan 27 2014We augment Restorff's classification of purely infinite Cuntz-Krieger algebras by describing the range of his invariant on purely infinite Cuntz-Krieger algebras. We also describe its range on purely infinite graph C*-algebras with finitely many ideals, ... More
Palm distributions for log Gaussian Cox processesJun 15 2015Jun 08 2016This paper establishes a remarkable result regarding Palmdistributions for a log Gaussian Cox process: the reduced Palmdistribution for a log Gaussian Cox process is itself a log Gaussian Coxprocess which only differs from the original log Gaussian Cox ... More
Generalized Risk-Aversion in Stochastic Multi-Armed BanditsMay 05 2014We consider the problem of minimizing the regret in stochastic multi-armed bandit, when the measure of goodness of an arm is not the mean return, but some general function of the mean and the variance.We characterize the conditions under which learning ... More
Linear-use CPS translations in the Enriched Effect CalculusSep 19 2012Oct 04 2012The enriched effect calculus (EEC) is an extension of Moggi's computational metalanguage with a selection of primitives from linear logic. This paper explores the enriched effect calculus as a target language for continuation-passing-style (CPS) translations ... More
Seven ways to improve example-based single image super resolutionNov 06 2015In this paper we present seven techniques that everybody should know to improve example-based single image super resolution (SR): 1) augmentation of data, 2) use of large dictionaries with efficient search structures, 3) cascading, 4) image self-similarities, ... More