Results for "Raquel Villacampa"

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Symplectic harmonicity and generalized coeffective cohomologiesApr 27 2014Relations between the symplectically harmonic and the coeffective cohomologies of a symplectic manifold are given. This is achieved through a generalization of the latter, which in addition provides a coeffective version of the filtered cohomologies. ... More
A family of 8-dimensional generalized complex nilmanifolds with infinitely many real homotopy typesMay 27 2019We prove that there are infinitely many real homotopy types of $8$-dimensional nilmanifolds admitting generalized complex structures of type $k$ for every $0 \leq k \leq 4$. This is in deep contrast to the $6$-dimensional case.
On Gauduchon connections with Kähler-like curvatureSep 07 2018We study Hermitian metrics with a Gauduchon connection being "K\"ahler-like", namely, satisfying the same symmetries for curvature as the Levi Civita and Chern connections. In particular, we investigate $6$-dimensional solvmanifolds with invariant complex ... More
Strong Kaehler with torsion structures from almost contact manifoldsSep 22 2009Nov 18 2010For an almost contact metric manifold $N$, we find conditions for which either the total space of an $S^1$-bundle over $N$ or the Riemannian cone over $N$ admits a strong K\"ahler with torsion (SKT) structure. In this way we construct new 6-dimensional ... More
Symplectic harmonicity and generalized coeffective cohomologiesApr 27 2014Jul 17 2018Relations between the symplectically harmonic cohomology and the coeffective cohomology of a symplectic manifold are obtained. This is achieved through a generalization of the latter, which in addition allows us to provide a coeffective version of the ... More
Non-nilpotent complex geometry of nilmanifolds and heterotic supersymmetryDec 27 2009Dec 04 2012We classify non-nilpotent complex structures on 6-nilmanifolds and their associated invariant balanced metrics. As an application we find a large family of solutions of the heterotic supersymmetry equations with non-zero flux, non-flat instanton and constant ... More
Abelian Balanced Hermitian structures on unimodular Lie algebrasDec 22 2014Let $\mathfrak{g}$ be a $2n$-dimensional unimodular Lie algebra equipped with a Hermitian structure $(J,F)$ such that the complex structure $J$ is abelian and the fundamental form $F$ is balanced. We prove that the holonomy group of the associated Bismut ... More
Balanced Hermitian geometry on 6-dimensional nilmanifoldsApr 28 2011Dec 04 2012The invariant balanced Hermitian geometry of nilmanifolds of dimension 6 is described. We prove that the holonomy group of the associated Bismut connection reduces to a proper subgroup of SU(3) if and only if the complex structure is abelian. As an application ... More
On the Bott-Chern cohomology and balanced Hermitian nilmanifoldsOct 01 2012The Bott-Chern cohomology of 6-dimensional nilmanifolds endowed with invariant complex structure is studied with special attention to the cases when balanced or strongly Gauduchon Hermitian metrics exist. We consider complex invariants introduced by Angella ... More
A family of complex nilmanifolds with infinitely many real homotopy typesDec 21 2017We find a one-parameter family of non-isomorphic nilpotent Lie algebras $\mathfrak{g}_a$, with $a \in [0,\infty)$, of real dimension eight with (strongly non-nilpotent) complex structures. By restricting $a$ to take rational values, we arrive at the existence ... More
Laplacian coflow for warped $\mathrm{G}_2$-structuresApr 12 2019We consider the Laplacian coflow of a $\mathrm{G}_2$-structure on warped products of the form $M^7= M^6 \times_f S^1$ with $M^6$ a compact 6-manifold endowed with an $\mathrm{SU}(3)$-structure. We give an explicit reinterpretation of this flow as a set ... More
Solutions of the Laplacian flow and coflow of a Locally Conformal Parallel $\mathrm{G}_2$-structureNov 23 2017We study the Laplacian flow of a $\mathrm{G}_2$-structure where this latter structure is claimed to be Locally Conformal Parallel. The first examples of long time solutions of this flow with the Locally Conformal Parallel condition are given. These examples ... More
Compact supersymmetric solutions of the heterotic equations of motion in dimensions 7 and 8Jun 26 2008Nov 16 2008We construct explicit compact solutions with non-zero field strength, non-flat instanton and constant dilaton to the heterotic string equations in dimensions seven and eight. We present a quadratic condition on the curvature which is necessary and sufficient ... More
Invariant complex structures on 6-nilmanifolds: classification, Frölicher spectral sequence and special Hermitian metricsNov 24 2011Oct 10 2014We classify invariant complex structures on 6-dimensional nilmanifolds up to equivalence. As an application, the behaviour of the associated Fr\"olicher sequence is studied as well as its relation to the existence of strongly Gauduchon metrics. We also ... More
Non-Kaehler Heterotic String Compactifications with non-zero fluxes and constant dilatonApr 10 2008Jun 17 2008We construct new explicit compact supersymmetric valid solutions with non-zero field strength, non-flat instanton and constant dilaton to the heterotic equations of motion in dimension six. We present balanced Hermitian structures on compact nilmanifolds ... More
Complex structures of splitting typeJul 13 2015Apr 27 2016We study the six-dimensional solvmanifolds that admit complex structures of splitting type classifying the underlying solvable Lie algebras. In particular, many complex structures of this type exist on the Nakamura manifold $X$, and they allow us to construct ... More
Compact supersymmetric solutions of the heterotic equations of motion in dimension 5Nov 13 2008Jun 09 2009We construct explicit compact supersymmetric solutions with non-zero field strength, non-flat instanton and constant dilaton to the heterotic string equations in dimension five. We present a quadratic condition on the curvature which is necessary and ... More
Balanced Hermitian metrics from SU(2)-structuresAug 08 2008We study the intrinsic geometrical structure of hypersurfaces in 6-manifolds carrying a balanced Hermitian SU(3)-structure, which we call {\em balanced} SU(2)-{\em structures}. We provide conditions which imply that such a 5-manifold can be isometrically ... More
The ascending central series of nilpotent Lie algebras with complex structureAug 16 2017We obtain several restrictions on the terms of the ascending central series of a nilpotent Lie algebra $\mathfrak g$ under the presence of a complex structure $J$. In particular, we find a bound for the dimension of the center of $\mathfrak g$ when it ... More
The modular class of a Dirac mapJan 26 2016In this paper we study the modular classes of Dirac manifolds and of Dirac maps, and we discuss their basic properties. We apply these results to explain the relationship between the modular classes of the various structures involved in the reduction ... More
Hyperbolicity and Types of Shadowing for C1 Generic Vector FieldsMay 13 2013Mar 04 2016We study various types of shadowing properties and their implication for C1 generic vector fields. We show that, generically, any of the following three hypotheses implies that an isolated set is topologically transitive and hyperbolic: (i) the set is ... More
Modular classes of Poisson-Nijenhuis Lie algebroidsJan 17 2007May 18 2007The modular vector field of a Poisson-Nijenhuis Lie algebroid $A$ is defined and we prove that, in case of non-degeneracy, this vector field defines a hierarchy of bi-Hamiltonian $A$-vector fields. This hierarchy covers an integrable hierarchy on the ... More
Invariant solutions to the Strominger system and the heterotic equations of motion on solvmanifoldsApr 11 2016We present compact solvmanifolds that provide many invariant solutions to the Strominger system with respect to a 2-parameter family of metric connections $\nabla^{\varepsilon,\rho}$. The family $\nabla^{\varepsilon,\rho}$ is a natural extension of the ... More
On the Sormani-Wenger Intrinsic Flat Convergence of Alexandrov SpacesNov 25 2014Sep 19 2018We study sequences of integral current spaces $(X_j,d_j,T_j)$ such that the integral current structure $T_j$ has weight $1$ and no boundary and, all $(X_j,d_j)$ are closed Alexandrov spaces with curvature uniformly bounded from below and diameter uniformly ... More
Phase-Space Noncommutativity and the Dirac EquationMay 13 2011Oct 06 2011We consider full phase-space noncommutativity in the Dirac equation, and find that in order to preserve gauge invariance, configuration space noncommutativity must be dropped. The resulting space structure gives rise to a constant magnetic field background ... More
Sequences of Open Riemannian Manifolds with BoundaryJan 17 2013Jun 19 2013We consider sequences of open Riemannian manifolds with boundary that have no regularity conditions on the boundary. To define a reasonable notion of a limit of such a sequence, we examine "$\delta$ inner regions" which avoid the boundary by a distance ... More
Deep Watershed Transform for Instance SegmentationNov 24 2016Most contemporary approaches to instance segmentation use complex pipelines involving conditional random fields, recurrent neural networks, object proposals, or template matching schemes. In our paper, we present a simple yet powerful end-to-end convolutional ... More
Selection rules for quasiparticle interference with internal nonsymmorphic symmetriesDec 26 2017Dec 10 2018We study how nonsymmorphic symmetries that commute with lattice translations are reflected in the quasiparticle interference (QPI) maps measured by scanning tunneling microscopy (STM). QPI maps, which result from scattering of Bloch states off impurities, ... More
Revealing the non-adiabatic nature of dark energy perturbations from galaxy clustering dataJul 11 2017We study structure formation using relativistic cosmological linear perturbation theory in the presence of intrinsic and relative (with respect to matter) non-adiabatic dark energy perturbations. For different dark energy models we assess the impact of ... More
Osculating properties of decomposable scrollsNov 23 2007Osculating spaces of decomposable scrolls (of any genus and not necessarily normal)are studied and their inflectional loci are related to those of their generating curves by using systematically an idea introduced by Piene and Sacchiero in the setting ... More
Fatou-Bieberbach domains as basins of attraction of automorphisms tangent to the identityJul 12 2009We prove that there exists an automorphism of C^2 tangent to the identity with a domain of attraction to the origin, biholomorphic to the origin, along a degenerate characteristic direction.
Limit points of lines of minima in Thurston's boundary of Teichmueller spaceMar 09 2003Given two measured laminations mu and nu in a hyperbolic surface which fill up the surface, Kerckhoff [Lines of Minima in Teichmueller space, Duke Math J. 65 (1992) 187-213] defines an associated line of minima along which convex combinations of the length ... More
On the Sormani-Wenger Intrinsic Flat Convergence of Alexandrov SpacesNov 25 2014We study noncollapsing sequences of integral current spaces $(X_j,d_j,T_j)$ with no boundary such that $(X_j,d_j)$ are Alexandrov spaces with nonnegative curvature and diameter uniformly bounded from above and such that the integral current structure ... More
Constructions of MDS convolutional codes using superregular matricesMar 26 2019Apr 11 2019Maximum distance separable convolutional codes are the codes that present best performance in error correction among all convolutional codes with certain rate and degree. In this paper, we show that taking the constant matrix coefficients of a polynomial ... More
On minimality of convolutional ring encodersJan 24 2008Apr 14 2009Convolutional codes are considered with code sequences modelled as semi-infinite Laurent series. It is wellknown that a convolutional code C over a finite group G has a minimal trellis representation that can be derived from code sequences. It is also ... More
Constructions of MDS convolutional codes using superregular matricesMar 26 2019Maximum distance separable convolutional codes are the codes that present best performance in error correction for fixed rate and degree. In this paper we present conditions on the coefficients of the entries of the generator matrices of a convolutional ... More
Asymptotic behavior of grafting raysSep 05 2007Sep 20 2007In this paper we study the convergence behavior of grafting rays to the Thurston boundary of Teichmuller space. When the grafting is done along a weighted system of simple closed curves or along a maximal uniquely ergodic lamination this behavior is the ... More
Splitting the hinge mode of higher-order topological insulatorsJul 11 2018Mar 01 2019The surface of a higher order topological insulator (HOTI) comprises a two-dimensional topological insulator (TI) with broken inversion symmetry, whose mass is determined by the microscopic details of the surface such as surface potentials and termination. ... More
Depth of segments and circles through points enclosing many points: a noteMar 07 2008Neumann-Lara and Urrutia showed in 1985 that in any set of n points in the plane in general positionthere is always a pair of points such that any circle through them contains at least (n-2)/60 points. In a series of papers, this result was subsequently ... More
Automatic Evaluation of Neural Personality-based ChatbotsSep 30 2018Stylistic variation is critical to render the utterances generated by conversational agents natural and engaging. In this paper, we focus on sequence-to-sequence models for open-domain dialogue response generation and propose a new method to evaluate ... More
Examining a hate speech corpus for hate speech detection and popularity predictionMay 12 2018As research on hate speech becomes more and more relevant every day, most of it is still focused on hate speech detection. By attempting to replicate a hate speech detection experiment performed on an existing Twitter corpus annotated for hate speech, ... More
Remarks on Automorphisms of $\mathbb{C}^* \times \mathbb{C}^*$ and their basinsSep 12 2008We study basins of attraction of automorphisms of $\CC^2$ tangent to the identity that fix both axes. Our main result is that, if a well known conjecture about automorphisms of $\CC^*\times\CC^*$ holds, then there are no basins of attraction associated ... More
Mutations of simple-minded systems in Calabi-Yau categories generated by a spherical objectDec 31 2015In this article, we give a definition and a classification of 'higher' simple-minded systems in triangulated categories generated by spherical objects with negative Calabi-Yau dimension. We also study mutations of this class of objects and that of 'higher' ... More
Helical Majorana surface states of strongly disordered topological superconductors with time-reversal symmetrySep 28 2014Jan 26 2015Noncentrosymmetric superconductors with strong spin-orbit coupling and the B phase of ${}^3$He are possible realizations of topological superconductors with time-reversal symmetry. The nontrivial topology of these time- reversal invariant superconductors ... More
The Road to Success: Assessing the Fate of Linguistic Innovations in Online CommunitiesJun 15 2018We investigate the birth and diffusion of lexical innovations in a large dataset of online social communities. We build on sociolinguistic theories and focus on the relation between the spread of a novel term and the social role of the individuals who ... More
Proper Hamiltonian Cycles in Edge-Colored MultigraphsNov 19 2014Jul 27 2016A $c$-edge-colored multigraph has each edge colored with one of the $c$ available colors and no two parallel edges have the same color. A proper Hamiltonian cycle is a cycle containing all the vertices of the multigraph such that no two adjacent edges ... More
A polynomial skew-product with a wandering Fatou-diskMay 06 2014Little is known about the existence of wandering Fatou components for rational maps in two complex variables. In 2003 Lilov proved the non-existence of wandering Fatou components for polynomial skew-products in the neighborhood of an invariant super-attracting ... More
Torsion pairs in a triangulated category generated by a spherical objectApr 17 2014Nov 06 2015We extend Ng's characterisation of torsion pairs in the 2-Calabi-Yau triangulated category generated by a 2-spherical object to the characterisation of torsion pairs in the w-Calabi-Yau triangulated category, $T_w$, generated by a w-spherical object for ... More
Simple-minded systems and reduction for negative Calabi-Yau triangulated categoriesAug 07 2018We develop the basic properties of $w$-simple-minded systems in $(-w)$-Calabi-Yau triangulated categories for $w \geq 1$. The main result is a reduction technique for negative Calabi-Yau triangulated categories. We show that the theory of simple-minded ... More
Stability of flat-band edge states in topological superconductors without inversion centerNov 27 2013Feb 06 2014Nodal superconductors without inversion symmetry exhibit nontrivial topological properties, manifested by topologically protected flat-band edge states. Here we study the effects of breaking translational symmetry, crucial to the definition of the topological ... More
Nonequilibrium corrections in the pressure tensor due to an energy fluxSep 02 1996The physical interpretation of the nonequilibrium corrections in the pressure tensor for radiation submitted to an energy flux obtained in some previous works is revisited. Such pressure tensor is shown to describe a moving equilibrium system but not ... More
Mild bounds on bigravity from primordial gravitational wavesMay 03 2015If the amplitude of primordial gravitational waves is measured in the near-future, what could it tell us about bigravity? To address this question, we study massive bigravity theories by focusing on a region in parameter space which is safe from known ... More
Semantic Variation in Online Communities of PracticeJun 15 2018We introduce a framework for quantifying semantic variation of common words in Communities of Practice and in sets of topic-related communities. We show that while some meaning shifts are shared across related communities, others are community-specific, ... More
A geometric model for the module category of a gentle algebraMar 15 2018In this article, gentle algebras are realised as tiling algebras, which are associated to partial triangulations of unpunctured surfaces with marked points on the boundary. This notion of tiling algebras generalise the notion of Jacobian algebras of triangulations ... More
Quantum quenches during inflationNov 30 2016We propose a new technique to study fast transitions during inflation, by studying the dynamics of quantum quenches in an $O(N)$ scalar field theory in de Sitter spacetime. We compute the time evolution of the system using a non-perturbative large-$N$ ... More
A generalized tetrahedral propertySep 18 2017Dec 23 2018We present examples of metric spaces that are not Riemannian manifolds nor dimensionally homogeneous that satisfy the Tetrahedral Property. In spite of that, Euclidean cones over metric spaces with small diameter do not satisfy this property. We extend ... More
Angular momentum transfer between oscillations and rotation in subdwarf B hybrid pulsatorsSep 19 2011Context. Subdwarf B pulsators exhibit pressure (p) and/or gravity (g) modes. Their frequency spectra range from very simple, with few frequencies, to very rich, with more than fifty peaks in some cases. Balloon09 is a hybrid pulsating subdwarf B, showing ... More
Scale-dependent bias from multiple-field inflationMar 24 2013May 29 2013We provide a formula for the scaling behaviour of the inflationary bispectrum in the 'squeezed' limit where one momentum becomes much smaller than the other two. This determines the scaling of the halo bias at low wavenumber and will be an important observable ... More
A new LES model derived from generalized Navier-Stokes equations with nonlinear viscositySep 15 2015Large Eddy Simulation (LES) is a very useful tool when simulating turbulent flows if we are only interested in its "larger" scales. One of the possible ways to derive the LES equations is to apply a filter operator to the Navier-Stokes equations, obtaining ... More
Jacobi-Nijenhuis algebroids and their modular classesJun 11 2007Sep 26 2007Jacobi-Nijenhuis algebroids are defined as a natural generalization of Poisson-Nijenhuis algebroids, in the case where there exists a Nijenhuis operator on a Jacobi algebroid which is compatible with it. We study modular classes of Jacobi and Jacobi-Nijenhuis ... More
Short-Term Meaning Shift: A Distributional ExplorationSep 10 2018Apr 03 2019We present the first exploration of meaning shift over short periods of time in online communities using distributional representations. We create a small annotated dataset and use it to assess the performance of a standard model for meaning shift detection ... More
PIXOR: Real-time 3D Object Detection from Point CloudsFeb 17 2019Feb 28 2019We address the problem of real-time 3D object detection from point clouds in the context of autonomous driving. Computation speed is critical as detection is a necessary component for safety. Existing approaches are, however, expensive in computation ... More
Graph HyperNetworks for Neural Architecture SearchOct 12 2018Jan 12 2019Neural architecture search (NAS) automatically finds the best task-specific neural network topology, outperforming many manual architecture designs. However, it can be prohibitively expensive as the search requires training thousands of different networks, ... More
Bayesian Mixed Effect Sparse Tensor Response Regression Model with Joint Estimation of Activation and ConnectivityMar 30 2019Brain activation and connectivity analyses in task-based functional magnetic resonance imaging (fMRI) experiments with multiple subjects are currently at the forefront of data-driven neuroscience. In such experiments, interest often lies in understanding ... More
Weyl anomalies and the nature of the gravitational fieldJul 08 2019The presence of gravity generalizes the notion of scale invariance to Weyl invariance, namely, invariance under local rescalings of the metric. In this work, we have computed the Weyl anomaly for various classically scale or Weyl invariant theories, making ... More
Why does the effective field theory of inflation work?Nov 04 2013May 16 2014The effective field theory (EFT) of inflation has become the preferred method for computing cosmological correlation functions of the curvature fluctuation, $\zeta$. It makes explicit use of the soft breaking of time diffeomorphisms by the inflationary ... More
PIXOR: Real-time 3D Object Detection from Point CloudsFeb 17 2019We address the problem of real-time 3D object detection from point clouds in the context of autonomous driving. Computation speed is critical as detection is a necessary component for safety. Existing approaches are, however, expensive in computation ... More
Conformal invariance versus Weyl invarianceMar 13 2019May 31 2019The most general quadratic lagrangian describing spin 2 particles in flat spacetime and containing operators of dimension up to 6 is carefully analyzed, determining the precise conditions for it to be invariant under linearized (transverse) diffeomorphisms, ... More
DeepSignals: Predicting Intent of Drivers Through Visual SignalsMay 03 2019Detecting the intention of drivers is an essential task in self-driving, necessary to anticipate sudden events like lane changes and stops. Turn signals and emergency flashers communicate such intentions, providing seconds of potentially critical reaction ... More
Variability Analysis of Complex Networks Measures based on Stochastic DistancesJul 29 2014Complex networks can model the structure and dynamics of different types of systems. It has been shown that they are characterized by a set of measures. In this work, we evaluate the variability of complex networks measures face to perturbations and, ... More
Inversion of a mapping associated with the Aomoto-Forrester systemFeb 06 2013Dec 05 2013This article is devoted to the study of a general class of Hamiltonian systems which extends the Calogero systems with external quadratic potential associated to any root system. The interest for such a class comes from a previous article of Aomoto and ... More
Short-Term Meaning Shift: A Distributional ExplorationSep 10 2018Apr 30 2019We present the first exploration of meaning shift over short periods of time in online communities using distributional representations. We create a small annotated dataset and use it to assess the performance of a standard model for meaning shift detection ... More
Inflectional loci of scrollsDec 14 2006Mar 28 2007Let $X\subset \mathbb P^N$ be a scroll over a smooth curve $C$ and let $\L=\mathcal O_{\mathbb P^N}(1)|_X$ denote the hyperplane bundle. The special geometry of $X$ implies that some sheaves related to the principal part bundles of $\L$ are locally free. ... More
Classification of interacting fermionic phases by dimensional reductionJan 07 2016We present a dimensional reduction argument to derive the classification of fermionic symmetry protected topological phases in the presence of interactions. The dimensional reduction proceeds by relating the topological character of a $d$-dimensional ... More
Short-term meaning shift: an exploratory distributional analysisSep 10 2018We investigate diachronic meaning shift that takes place in short periods of time (short-term meaning shift) and in an online community of speakers. We create a small dataset and use it to assess the performance of a standard model for meaning shift detection ... More
Locally Enhanced and Tunable Optical Chirality in Helical MetamaterialsNov 23 2016We report on a numerical study of optical chirality. Intertwined gold helices illuminated with plane waves concentrate right and left circularly polarized electromagnetic field energy to sub-wavelength regions. These spots of enhanced chirality can be ... More
Conformal invariance versus Weyl invarianceMar 13 2019Apr 09 2019The most general quadratic lagrangian describing spin 2 particles in flat spacetime and containing operators of dimension up to 6 is carefully analyzed, determining the precise conditions for it to be invariant under linearized (transverse) diffeomorphisms, ... More
Conformal invariance versus Weyl invarianceMar 13 2019The most general quadratic lagrangian describing spin 2 particles in flat spacetime and containing operators of dimension up to 6 is carefully analyzed, determining the precise conditions for it to be invariant under linearized (transverse) diffeomorphisms, ... More
Unified description of the classical Hall viscosityMar 13 2019In absence of time-reversal symmetry, viscous electron flow hosts a number of interesting phenomena, of which we focus here on the Hall viscosity. Taking a step beyond the hydrodynamic definition of the Hall viscosity, we derive a generalized relation ... More
Column distance of convolutional codes over ZprJul 31 2017Rosenthal et al. introduced and thoroughly studied the notion of Maximum Distance Profile (MDP) convolutional codes over (non-binary) finite fields refining the classical notion of optimum distance profile, see for instance [18, p.164]. These codes have ... More
On fractional p-Laplacian problems with weightApr 22 2014We investigate the existence of nonnegative solutions for a nonlinear problem involving the fractional p-Laplacian operator. The problem is set on a unbounded domain, and compactness issues have to be handled.
Radiative decays of the Y(3940), Z(3930) and the X(4160) as dynamically generated resonancesOct 04 2010We study the radiative decay properties of the charmonium-like X, Y and Z mesons generated dynamically from vector meson-vector meson interaction in the framework of a unitarized hidden-gauge formalism. In the present work we calculate the one- and two-photon ... More
The effects of a fast-turning trajectory in multiple-field inflationJan 23 2014Aug 27 2014The latest results from PLANCK impose strong constraints on features in the spectrum of the curvature perturbations from inflation. We analyse the possibility of particle production induced by sharp turns of the trajectory in field space in inflation ... More
FollowMe: Efficient Online Min-Cost Flow Tracking with Bounded Memory and ComputationJul 23 2014Dec 25 2014One of the most popular approaches to multi-target tracking is tracking-by-detection. Current min-cost flow algorithms which solve the data association problem optimally have three main drawbacks: they are computationally expensive, they assume that the ... More
On MDS convolutional Codes over $\mathbb Z_{p^r}$Jan 18 2016Maximum Distance Separable (MDS) convolutional codes are cha- racterized through the property that the free distance meets the generalized Singleton bound. The existence of free MDS convolutional codes over Z p r was recently discovered in [26] via the ... More
Analysing the potential of seq-to-seq models for incremental interpretation in task-oriented dialogueAug 28 2018We investigate how encoder-decoder models trained on a synthetic dataset of task-oriented dialogues process disfluencies, such as hesitations and self-corrections. We find that, contrary to earlier results, disfluencies have very little impact on the ... More
The δN formula is the dynamical renormalization groupOct 29 2012Oct 30 2013We derive the 'separate universe' method for the inflationary bispectrum, beginning directly from a field-theory calculation. We work to tree-level in quantum effects but to all orders in the slow-roll expansion, with masses accommodated perturbatively. ... More
PIXOR: Real-time 3D Object Detection from Point CloudsFeb 17 2019Mar 02 2019We address the problem of real-time 3D object detection from point clouds in the context of autonomous driving. Computation speed is critical as detection is a necessary component for safety. Existing approaches are, however, expensive in computation ... More
Asymptotically linear fractional Schrodinger equationsJan 09 2014By exploiting a variational technique based upon projecting over the Pohozaev manifold, we prove existence of positive solutions for a class of nonlinear fractional Schrodinger equations having a nonhomogenous nonautonomous asymptotically linear nonlinearity. ... More
Endomorphism algebras for a class of negative Calabi-Yau categoriesFeb 06 2016Feb 16 2016We consider an orbit category of the bounded derived category of a path algebra of type A_n which can be viewed as a -(m+1)-cluster category, for m >= 1. In particular, we give a characterisation of those maximal m-rigid objects whose endomorphism algebras ... More
Analyzing Tag Distributions in Folksonomies for Resource ClassificationFeb 23 2012Recent research has shown the usefulness of social tags as a data source to feed resource classification. Little is known about the effect of settings on folksonomies created on social tagging systems. In this work, we consider the settings of social ... More
Using Bursty Announcements for Early Detection of BGP Routing AnomaliesMay 14 2019Despite the robust structure of the Internet, it is still susceptible to disruptive routing updates that prevent network traffic from reaching its destination. In this work, we propose a method for early detection of large-scale disruptions based on the ... More
EEG-assisted retrospective motion correction for fMRI: E-REMCORJan 21 2012Jul 16 2012We propose a method for retrospective motion correction of fMRI data in simultaneous EEG-fMRI that employs the EEG array as a sensitive motion detector. EEG motion artifacts are used to generate motion regressors describing rotational head movements with ... More
Evaluating the Representational Hub of Language and Vision ModelsApr 12 2019The multimodal models used in the emerging field at the intersection of computational linguistics and computer vision implement the bottom-up processing of the `Hub and Spoke' architecture proposed in cognitive science to represent how the brain processes ... More
BRDF Estimation of Complex Materials with Nested LearningNov 22 2018The estimation of the optical properties of a material from RGB-images is an important but extremely ill-posed problem in Computer Graphics. While recent works have successfully approached this problem even from just a single photograph, significant simplifications ... More
Physical content of Quadratic GravityFeb 16 2018Jul 12 2018We have recently undergone an analysis of gravitational theories as defined in first order formalism, where the metric and the connection are treated as independent fields. The physical meaning of the connection field has historically been somewhat elusive. ... More
Anisotropy of the DC conductivity due to orbital-selective spin fluctuations in the nematic phase of iron superconductorsApr 19 2018Apr 09 2019We study the dc conductivity of iron-based superconductors within the orbital-selective spin fluctuation scenario. Within this approach, the anisotropy of spin fluctuations below the spin-nematic transition at T$_S$ is also responsible for the orbital ... More
DARNet: Deep Active Ray Network for Building SegmentationMay 15 2019In this paper, we propose a Deep Active Ray Network (DARNet) for automatic building segmentation. Taking an image as input, it first exploits a deep convolutional neural network (CNN) as the backbone to predict energy maps, which are further utilized ... More
Extraction of isoscalar $ππ$ phase-shifts from lattice QCDMar 07 2018We conduct a two-flavor ($N_f=2$) lattice QCD calculation of the elastic phase-shifts for pion-pion scattering in the scalar, isoscalar channel (the $\sigma$-meson). The calculation is performed for two quark masses corresponding to a pion mass of $315\text{ ... More
Understanding quality control of hard metals in industry -- A quantum mechanics approachFeb 21 2019For many decades, the magnetic saturation of, e.g. hard metals (HM) such as WC-Co-based cemented carbides, has been used as process and quality control in industry to ensure consistency of product properties. In an urge of replacing cobalt as a binder ... More