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Multimodal Generative Models for Scalable Weakly-Supervised LearningFeb 14 2018Nov 12 2018Multiple modalities often co-occur when describing natural phenomena. Learning a joint representation of these modalities should yield deeper and more useful representations. Previous generative approaches to multi-modal input either do not learn a joint ... More

Overtwisted open books from sobering arcsJul 24 2004Oct 11 2005We study open books on three manifolds which are compatible with an overtwisted contact structure. We show that the existence of certain arcs, called sobering arcs, is a sufficient condition for an open book to be overtwisted, and is necessary up to stabilization ... More

Meta-Amortized Variational Inference and LearningFeb 05 2019How can we learn to do probabilistic inference in a way that generalizes between models? Amortized variational inference learns for a single model, sharing statistical strength across observations. This benefits scalability and model learning, but does ... More

Zero Shot Learning for Code Education: Rubric Sampling with Deep Learning InferenceSep 05 2018Dec 17 2018In modern computer science education, massive open online courses (MOOCs) log thousands of hours of data about how students solve coding challenges. Being so rich in data, these platforms have garnered the interest of the machine learning community, with ... More

Neurally-Guided Procedural Models: Amortized Inference for Procedural Graphics Programs using Neural NetworksMar 19 2016Oct 13 2016Probabilistic inference algorithms such as Sequential Monte Carlo (SMC) provide powerful tools for constraining procedural models in computer graphics, but they require many samples to produce desirable results. In this paper, we show how to create procedural ... More

When redundancy is rational: A Bayesian approach to 'overinformative' referring expressionsMar 19 2019Referring is one of the most basic and prevalent uses of language. How do speakers choose from the wealth of referring expressions at their disposal? Rational theories of language use have come under attack for decades for not being able to account for ... More

On the stable equivalence of open books in three-manifoldsSep 23 2005Mar 03 2009We show that two open books in a given closed, oriented three-manifold admit isotopic stabilizations, where the stabilization is made by successive plumbings with Hopf bands, if and only if their associated plane fields are homologous. Since this condition ... More

Variational Estimators for Bayesian Optimal Experimental DesignMar 13 2019Bayesian optimal experimental design (BOED) is a principled framework for making efficient use of limited experimental resources. Unfortunately, its applicability is hampered by the difficulty of obtaining accurate estimates of the expected information ... More

Evaluating Compositionality in Sentence EmbeddingsFeb 12 2018May 17 2018An important challenge for human-like AI is compositional semantics. Recent research has attempted to address this by using deep neural networks to learn vector space embeddings of sentences, which then serve as input to other tasks. We present a new ... More

Lost in Machine Translation: A Method to Reduce Meaning LossFeb 25 2019Apr 12 2019A desideratum of high-quality translation systems is that they preserve meaning, in the sense that two sentences with different meanings should not translate to one and the same sentence in another language. However, state-of-the-art systems often fail ... More

Lost in Machine Translation: A Method to Reduce Meaning LossFeb 25 2019A desideratum of high-quality translation systems is that they preserve meaning, in the sense that two sentences with different meanings should not translate to one and the same sentence in another language. However, state-of-the-art systems often fail ... More

A Dynamic Programming Algorithm for Inference in Recursive Probabilistic ProgramsJun 15 2012Sep 10 2012We describe a dynamic programming algorithm for computing the marginal distribution of discrete probabilistic programs. This algorithm takes a functional interpreter for an arbitrary probabilistic programming language and turns it into an efficient marginalizer. ... More

A pragmatic theory of generic languageAug 09 2016Aug 26 2016Generalizations about categories are central to human understanding, and generic language (e.g. "Dogs bark.") provides a simple and ubiquitous way to communicate these generalizations. Yet the meaning of generic language is philosophically puzzling and ... More

Inducing Probabilistic Programs by Bayesian Program MergingOct 25 2011This report outlines an approach to learning generative models from data. We express models as probabilistic programs, which allows us to capture abstract patterns within the examples. By choosing our language for programs to be an extension of the algebraic ... More

C3: Lightweight Incrementalized MCMC for Probabilistic Programs using Continuations and Callsite CachingSep 07 2015Sep 08 2015Lightweight, source-to-source transformation approaches to implementing MCMC for probabilistic programming languages are popular for their simplicity, support of existing deterministic code, and ability to execute on existing fast runtimes. However, they ... More

Deep Amortized Inference for Probabilistic ProgramsOct 18 2016Probabilistic programming languages (PPLs) are a powerful modeling tool, able to represent any computable probability distribution. Unfortunately, probabilistic program inference is often intractable, and existing PPLs mostly rely on expensive, approximate ... More

Learning to Generate Compositional Color DescriptionsJun 13 2016Oct 18 2016The production of color language is essential for grounded language generation. Color descriptions have many challenging properties: they can be vague, compositionally complex, and denotationally rich. We present an effective approach to generating color ... More

Learning the Preferences of Ignorant, Inconsistent AgentsDec 18 2015An important use of machine learning is to learn what people value. What posts or photos should a user be shown? Which jobs or activities would a person find rewarding? In each case, observations of people's past choices can inform our inferences about ... More

Planning, Inference and Pragmatics in Sequential Language GamesMay 30 2018We study sequential language games in which two players, each with private information, communicate to achieve a common goal. In such games, a successful player must (i) infer the partner's private information from the partner's messages, (ii) generate ... More

Differentiable Antithetic Sampling for Variance Reduction in Stochastic Variational InferenceOct 05 2018Stochastic optimization techniques are standard in variational inference algorithms. These methods estimate gradients by approximating expectations with independent Monte Carlo samples. In this paper, we explore a technique that uses correlated, but more ... More

Galaxy interactions in the Hickson Compact Group 88Sep 21 2015I present observations of the Hickson Compact Group 88 (HCG88) obtained during the commissioning of a new 28-inch telescope at the Wise Observatory. This galaxy group was advertised to be non-interacting, or to be in a very early interaction stage, but ... More

Dwarf Irregular Galaxies and the Intergalactic MediumOct 20 1998Dwarf galaxies (DGs) are more numerous than large galaxies. Most dwarfs in clusters are dEs, but in the field they belong mostly to late types. The importance of late-type DGs in the context of the intergalactic medium (IGM) lies in the fact that (at ... More

Electromagnetic Casimir Forces in Elliptic Cylinder GeometriesMar 26 2013The scattering theory approach makes it possible to carry out exact calculations of Casimir energies in any geometry for which the scattering T-matrix and a partial wave expansion of the free Green's function are available. We implement this program for ... More

Pragmatic inference and visual abstraction enable contextual flexibility during visual communicationMar 11 2019Mar 28 2019Visual modes of communication are ubiquitous in modern life --- from maps to data plots to political cartoons. Here we investigate drawing, the most basic form of visual communication. Participants were paired in an online environment to play a drawing-based ... More

Transfinite Recursion in Higher Reverse MathematicsOct 22 2013In this paper we investigate the reverse mathematics of higher-order analogues of the theory \ATRz{} within the framework of higher order reverse mathematics developed by Kohlenbach \cite{Koh01}. We define a theory \RCAzthr, a close higher-type analogue ... More

Ultraviolet Sky SurveysSep 29 1996Sep 30 1996I review the development of UV and EUV astronomy, covering the spectral range from 5 to 300 nm, with emphasis on sky surveys for discrete sources. I discuss studies which resulted in lists of sources observed by imaging. The missions are compared in terms ... More

UV sky surveysJul 26 1998I review the development of UV and EUV astronomy, covering the spectral range from 5 to 300 nm, with emphasis on sky surveys for discrete sources. I discuss studies which resulted in lists of sources observed by imaging and deliberately omit most spectroscopic ... More

Modeling and Particle Tracking through Longitudinal Gradient Bending MagnetsOct 26 2015This report documents the development of a versatile model for longitudinal gradient bending magnets (LGB's) and its implementation in particle tracking simulations. The model presented below may be used to represent an arbitrary magnetic field profile, ... More

Intentional Design for EmpowermentAug 27 2013I argue for empowering education, adapting Marx's idea of ownership of the means of production, and discuss interactive simulations as one example of a tool in which intentional design can support student ownership of learning. I propose a model that ... More

Acyclic Colorings of Directed GraphsSep 26 2014The acyclic chromatic number of a directed graph $D$, denoted $\chi_A(D)$, is the minimum positive integer $k$ such that there exists a decomposition of the vertices of $D$ into $k$ disjoint sets, each of which induces an acyclic subgraph. For any $m ... More

The monodromy of real Bethe vectors for the Gaudin modelNov 15 2015The Bethe algebras for the Gaudin model act on the multiplicity space of tensor products of irreducible $ \mathfrak{gl}_r $-modules and have simple spectrum over real points. This fact is proved by Mukhin, Tarasov and Varchenko who also develop a relationship ... More

Thinking about ArcheoastronomyMar 29 2011I discuss various aspects of archeoastronomy concentrating on physical artifacts (i.e., not including ethno-archeoastronomy) focusing on the period that ended about 2000 years ago. I present examples of artifacts interpreted as showing the interest of ... More

Quest for truly isolated galaxiesJun 23 2009I describe attempts to identify and understand the most isolated galaxies starting from my 1983 Leiden PhD thesis, continuing through a string of graduate theses on various aspects of this topic, and concluding with an up-to-date account of the difficulty ... More

The TAUVEX UV ImagerSep 30 1996I present an up-to-date description of the TAUVEX UV imager, constructed to operate on the Spectrum X-Gamma international space observatory. The projected performance and the expected scientific yield of TAUVEX are described.

Casimir Energies of Periodic Dielectric GratingsJul 17 2014Sep 23 2014Reflection of electromagnetic waves from a periodic grating can be described in terms of a discrete coupled multichannel scattering problem. By modeling the grating as a space- and frequency-dependent dielectric, it is possible to use a variable phase ... More

Mednykh's Formula via Lattice Topological Quantum Field TheoriesMar 05 2007Aug 28 2008Mednykh proved that for any finite group G and any orientable surface S, there is a formula for #Hom(pi_1(S), G) in terms of the Euler characteristic of S and the dimensions of the irreducible representations of G. A similar formula in the nonorientable ... More

The dual complex of $\bar{M}_{0,n}$ via phylogeneticsDec 01 2015May 09 2016The moduli space $\bar{M}_{0,n}$ of stable rational n-pointed curves has divisorial boundary with simple normal crossings. In this brief note I observe that the dual complex is a flag complex; that is, a collection of irreducible boundary divisors has ... More

Brownian bricklayer: a random space-filling curveAug 23 2017Let $(B(t),\,t\ge0)$ denote the standard, one-dimensional Wiener process and $(\ell(y,t);\, y\in\mathbb{R},\, t\ge0)$ its local time at level $y$ up to time $t$. Then $\big( (B(t),\, \ell(B(t),t)),\; t\ge0 \big)$ is a random path that fills the upper ... More

Pragmatic inference and visual abstraction enable contextual flexibility during visual communicationMar 11 2019Visual modes of communication are ubiquitous in modern life. Here we investigate drawing, the most basic form of visual communication. Communicative drawing poses a core challenge for theories of how vision and social cognition interact, requiring a detailed ... More

Practical optimal experiment design with probabilistic programsAug 17 2016Scientists often run experiments to distinguish competing theories. This requires patience, rigor, and ingenuity - there is often a large space of possible experiments one could run. But we need not comb this space by hand - if we represent our theories ... More

An Incremental Iterated Response Model of PragmaticsSep 30 2018Oct 19 2018Recent Iterated Response (IR) models of pragmatics conceptualize language use as a recursive process in which agents reason about each other to increase communicative efficiency. These models are generally defined over complete utterances. However, there ... More

The Infinite Latent Events ModelMay 09 2012We present the Infinite Latent Events Model, a nonparametric hierarchical Bayesian distribution over infinite dimensional Dynamic Bayesian Networks with binary state representations and noisy-OR-like transitions. The distribution can be used to learn ... More

Applying Probabilistic Programming to Affective ComputingMar 15 2019Affective Computing is a rapidly growing field spurred by advancements in artificial intelligence, but often, held back by the inability to translate psychological theories of emotion into tractable computational models. To address this, we propose a ... More

Restrictions on endomorphism rings of jacobians and their minimal fields of definitionJan 17 2019Apr 16 2019Zarhin has extensively studied restrictions placed on the endomorphism algebras of Jacobians $J$ for which the Galois group associated to their 2-torsion is insoluble and 'large' (relative to the dimension of $J$). In this paper we examine what happens ... More

Searching for the Neutrino Mixing Angle Theta-13 at ReactorsJun 04 2007Two neutrino mixing angles have been measured, and much of the neutrino community is turning its attention to the unmeasured mixing angle, $\quq$, whose best limit comes from the reactor neutrino experiment CHOOZ.\cite{bib:chooz} New two detector reactor ... More

Other Atmospheric Neutrino ExperimentsOct 23 2002The history and recent progress of atmospheric neutrinos are reviewed. An emphasis is placed on results from experiments other than Super-Kamiokande.

Neutrino Physics in 2020Feb 25 2014Many talks at the 16th Lomonosov Conference, dedicated to Bruno Pontecorvo, detail the remarkable progress in neutrino physics over the last two decades. In this paper, I give an opinionated, and therefore likely inaccurate, review of the future, with ... More

New Reactor Neutrino Experiments besides Double-CHOOZJan 21 2005Several new reactor neutrino experiments are being considered to measure the parameter theta-13. The current plans for Angra, Braidwood, Daya Bay, KASKA and KR2DET are reviewed. A case is made that, together with Double-CHOOZ, a future world program should ... More

Plans for Experiments to Measure $θ_{13}$Apr 23 2004New experiments at accelerators and reactors are being designed to search for a possible non-zero value of the MNS matrix parameter theta_{13}.

Reduction of Maximum Entropy Models to Hidden Markov ModelsDec 12 2012We show that maximum entropy (maxent) models can be modeled with certain kinds of HMMs, allowing us to construct maxent models with hidden variables, hidden state sequences, or other characteristics. The models can be trained using the forward-backward ... More

Repulsive Dark MatterMar 02 2000It seems necessary to suppress, at least partially, the formation of structure on subgalactic scales. As an alternative to warm or collisional dark matter, I postulate a condensate of massive bosons interacting via a repulsive interparticle potential, ... More

Efficient Algorithms for Parsing the DOP ModelApr 22 1996Excellent results have been reported for Data-Oriented Parsing (DOP) of natural language texts (Bod, 1993). Unfortunately, existing algorithms are both computationally intensive and difficult to implement. Previous algorithms are expensive due to two ... More

New Projects in Underground PhysicsJul 08 2003A large fraction of neutrino research is taking place in facilities underground. In this paper, I review the underground facilities for neutrino research. I discuss ideas for future reactor experiments being considered to measure theta_13 and the UNO ... More

Concerning thermal tides on hot JupitersJan 21 2009By analogy with a mechanism proposed by Gold and Soter to explain the retrograde rotation of Venus, Arras and Socrates suggest that thermal tides may excite hot jovian exoplanets into nonsynchronous rotation, and perhaps also noncircular orbits. It is ... More

Extended Comment on Language Trees and ZippingFeb 21 2002This is the extended version of a Comment submitted to Physical Review Letters. I first point out the inappropriateness of publishing a Letter unrelated to physics. Next, I give experimental results showing that the technique used in the Letter is 3 times ... More

A Bit of Progress in Language ModelingAug 09 2001In the past several years, a number of different language modeling improvements over simple trigram models have been found, including caching, higher-order n-grams, skipping, interpolated Kneser-Ney smoothing, and clustering. We present explorations of ... More

Global Thresholding and Multiple Pass ParsingAug 13 1997Aug 15 1997We present a variation on classic beam thresholding techniques that is up to an order of magnitude faster than the traditional method, at the same performance level. We also present a new thresholding technique, global thresholding, which, combined with ... More

Brownian Super-exponentsDec 06 2006We introduce a transform on the class of stochastic exponentials for d-dimensional Brownian motions. Each stochastic exponential generates another stochastic exponential under the transform. The new exponential process is often merely a supermartingale ... More

Inhomogeneous Quantum WalksJun 19 2009We study a natural construction of a general class of inhomogeneous quantum walks (namely walks whose transition probabilities depend on position). Within the class we analyze walks that are periodic in position and show that, depending on the period, ... More

Measurement entropy in Generalized Non-Signalling Theory cannot detect bipartite non-localityJul 13 2012Nov 13 2012We consider entropy in Generalized Non-Signalling Theory (also known as box world) where the most common definition of entropy is the measurement entropy. In this setting, we completely characterize the set of allowed entropies for a bipartite state. ... More

A time-distance trade-off for GDD with preprocessing---Instantiating the DLW heuristicFeb 22 2019For $0 \leq \alpha \leq 1/2$, we show an algorithm that does the following. Given appropriate preprocessing $P(\mathcal{L})$ consisting of $N_\alpha := 2^{O(n^{1-2\alpha} + \log n)}$ vectors in some lattice $\mathcal{L} \subset \mathbb{R}^n$ and a target ... More

From Poland to "Petersburg": The Banach-Tarski Paradox in Bely's Modernist NovelOct 16 2017Andrei Bely's novel "Petersburg," first published in 1913, was declared by Vladimir Nabokov one of the four greatest masterpieces of 20th-century prose. The Banach-Tarski Paradox, published in 1924, is one of the most striking and well-known results in ... More

Principal component analysis of IUE galaxy spectraFeb 12 2004We analyse the UV spectral energy distribution of a sample of normal galaxies listed in the IUE-INES Guide No. 2-Normal Galaxies (Formiggini & Brosch, 2000) using a Principal Component Analysis. The sample consists of the IUE-SW spectra of the central ... More

An analysis of the cost of hyper-parameter selection via split-sample validation, with applications to penalized regressionMar 28 2019In the regression setting, given a set of hyper-parameters, a model-estimation procedure constructs a model from training data. The optimal hyper-parameters that minimize generalization error of the model are usually unknown. In practice they are often ... More

Gradient-based Regularization Parameter Selection for Problems with Non-smooth Penalty FunctionsMar 28 2017In high-dimensional and/or non-parametric regression problems, regularization (or penalization) is used to control model complexity and induce desired structure. Each penalty has a weight parameter that indicates how strongly the structure corresponding ... More

Modular interpretation of a non-reductive Chow quotientSep 11 2015Sep 17 2017The space of n distinct points and a disjoint parameterized hyperplane in projective d-space up to projectivity---equivalently, configurations of n distinct points in affine d-space up to translation and homothety---has a beautiful compactification introduced ... More

Search-to-Decision Reductions for Lattice Problems with Approximation Factors (Slightly) Greater Than OneDec 13 2015Jul 03 2016We show the first dimension-preserving search-to-decision reductions for approximate SVP and CVP. In particular, for any $\gamma \leq 1 + O(\log n/n)$, we obtain an efficient dimension-preserving reduction from $\gamma^{O(n/\log n)}$-SVP to $\gamma$-GapSVP ... More

TAUVEX: status in 2011Feb 07 2011We present a short history of the TAUVEX instrument, conceived to provide multi-band wide-field imaging in the ultraviolet, emphasizing the lack of sufficient and aggressive support on the part of the different space agencies that dealt with this basic ... More

Late-Type Dwarf Galaxies in the Virgo Cluster: I. The SamplesMar 24 1996Apr 22 1998We selected samples of late-type dwarf galaxies in the Virgo cluster with HI information. The galaxies were observed at the Wise-Observatory using several broad-band and H$\alpha$ bandpasses. UV measurements were carried out with the IUE Observatory from ... More

Many binaries among NEAsJul 07 2006The number of binary asteroids in the near-Earth region might be significantly higher than expected. While Bottke and Melosh (1996) suggested that about 15% of the NEAs are binaries, as indicated from the frequency of double craters, and Pravec and Harris ... More

Variable Phase S-Matrix Calculations for Asymmetric Potentials and DielectricsOct 02 2012Dec 23 2012Motivated by recently developed techniques making it possible to compute Casimir energies for any object whose scattering S-matrix (or, equivalently, T-matrix) is available, we develop a variable phase method to compute the S-matrix for localized but ... More

A Grassmann algebra for matroidsOct 15 2015We introduce an idempotent analogue of the exterior algebra for which the theory of tropical linear spaces (and valuated matroids) can be seen in close analogy with the classical Grassmann algebra formalism for linear spaces. The top wedge power of a ... More

Path Intergals and Perturbative Expansions for Non-Compact Symmetric SpacesFeb 05 1992We show how to construct path integrals for quantum mechanical systems where the space of configurations is a general non-compact symmetric space. Associated with this path integral is a perturbation theory which respects the global structure of the system. ... More

GIT Compactifications of $M_{0,n}$ from ConicsJan 16 2010Jan 11 2015We study GIT quotients parametrizing n-pointed conics that generalize the GIT quotients $(\mathbb{P}^1)^n//SL2$. Our main result is that $\overline{M}_{0,n}$ admits a morphism to each such GIT quotient, analogous to the well-known result of Kapranov for ... More

Equations of tropical varietiesJul 31 2013Jan 31 2016We introduce a scheme-theoretic enrichment of the principal objects of tropical geometry. Using a category of semiring schemes, we construct tropical hypersurfaces as schemes over idempotent semirings such as $\mathbb{T} = (\mathbb{R}\cup \{-\infty\}, ... More

The center of the reflection equation algebra via quantum minorsSep 26 2017We give simple formulas for the elements $c_k$ appearing in a quantum Cayley-Hamilton formula for the reflection equation algebra (REA) associated to the quantum group $U_q(\mathfrak{gl}_N)$, answering a question of Kolb and Stokman. The $c_k$'s are certain ... More

Stack-sorting for WordsSep 24 2018Dec 08 2018We introduce operators $\mathsf{hare}$ and $\mathsf{tortoise}$, which act on words as natural generalizations of West's stack-sorting map. We show that the heuristically slower algorithm $\mathsf{tortoise}$ can sort words arbitrarily faster than its counterpart ... More

Matroidal representations of groupsOct 19 2018We develop the rudiments of a finite-dimensional representation theory of groups over idempotent semifields by considering linear actions on tropical linear spaces. This can be considered a tropical representation theory, a characteristic one modular ... More

Bias and Generalization in Deep Generative Models: An Empirical StudyNov 08 2018In high dimensional settings, density estimation algorithms rely crucially on their inductive bias. Despite recent empirical success, the inductive bias of deep generative models is not well understood. In this paper we propose a framework to systematically ... More

Complex Objects in the Polytopes of the Linear State-Space ProcessJan 21 2014A simple object (one point in $m$-dimensional space) is the resultant of the evolving matrix polynomial of walks in the irreducible aperiodic network structure of the first order DeGroot (weighted averaging) state-space process. This paper draws on a ... More

Grey Milky Way Extinction from SDSS Stellar PhotometrySep 01 2009We report results concerning the distribution and properties of galactic extinction at high galactic latitudes derived from stellar statistics using the Sloan Digital Sky Survey (SDSS). We use the classical Wolf diagram method to identify regions with ... More

A presentation of the deformed W_{1+\infty} algebraSep 03 2012We provide a generators and relation description of the deformed W_{1+\infty}-algebra introduced in previous joint work of E. Vasserot and the second author. This gives a presentation of the (spherical) cohomological Hall algebra of the one-loop quiver, ... More

Discriminant Analysis with Adaptively Pooled CovarianceNov 07 2011Dec 06 2011Linear and Quadratic Discriminant analysis (LDA/QDA) are common tools for classification problems. For these methods we assume observations are normally distributed within group. We estimate a mean and covariance matrix for each group and classify using ... More

Transition To Order After Hilltop InflationJan 24 2014We investigate the rich nonlinear dynamics during the end of hilltop inflation by numerically solving the coupled Klein-Gordon-Friedmann equations in a expanding universe. In particular, we search for coherent, nonperturbative configurations that may ... More

Bell nonlocality and Bayesian game theoryOct 03 2012We discuss a connection between Bell nonlocality and Bayesian games. This link offers interesting perspectives for Bayesian games, namely to allow the players to receive advice in the form of nonlocal correlations, for instance using entangled quantum ... More

Quantum communication beyond the localization length in disordered spin chainsJan 31 2008We study the effects of localization on quantum state transfer in spin chains. We show how to use quantum error correction and multiple parallel spin chains to send a qubit with high fidelity over arbitrary distances; in particular distances much greater ... More

Quantum temporal logic and decoherence functionals in the histories approach to generalised quantum theoryMay 11 1994We analyse and develop the recent suggestion that a temporal form of quantum logic provides the natural mathematical framework within which to discuss the proposal by Gell-Mann and Hartle for a generalised form of quantum theory based on the ideas of ... More

Preparing graduate students to be educatorsSep 01 2006We present two programs that address needs to better prepare graduate students for their roles as professional physicists, particularly in the areas of teaching and education research. The two programs, Preparing Future Physicists (PFP) and a course, ... More

Modeling dynamical scalarization with a resummed post-Newtonian expansionMar 10 2016Mar 13 2016Despite stringent constraints set by astrophysical observations, there remain viable scalar-tensor theories that could be distinguished from general relativity with gravitational-wave detectors. A promising signal predicted in these alternative theories ... More

Radiatively induced symmetry breaking and the conformally coupled magnetic monopole in AdS spaceOct 29 2013We implement quantum corrections for a magnetic monopole in a classically conformally invariant theory containing gravity. This yields the trace (conformal) anomaly and introduces a length scale in a natural fashion via the process of renormalization. ... More

Neural Discourse Structure for Text CategorizationFeb 07 2017May 06 2017We show that discourse structure, as defined by Rhetorical Structure Theory and provided by an existing discourse parser, benefits text categorization. Our approach uses a recursive neural network and a newly proposed attention mechanism to compute a ... More

The cone of type A, level one conformal blocks divisorsMay 16 2011May 17 2011We prove that the type A, level one, conformal blocks divisors on $\bar{M}_{0,n}$ span a finitely generated, full-dimensional subcone of the nef cone. Each such divisor induces a morphism from $\bar{M}_{0,n}$, and we identify its image as a GIT quotient ... More

Normal Galaxies - INES Guide No. 2Feb 12 2004This guide presents, in a uniform manner, all the information collected by the IUE satellite on normal galaxies. It contains information on 274 galaxies and it supersedes the previous IUE guide to normal galaxies (Longo & Capaccioli 1992). The data shown ... More

Projective linear configurations via non-reductive actionsJan 03 2014We study the iterated blow-up X of projective space along an arbitrary collection of linear subspaces. By replacing the universal torsor with an $\mathbb{A}^1$-homotopy equivalent model, built from $\mathbb{A}^1$-fiber bundles not just algebraic line ... More

Quantum subgroups of the Haagerup fusion categoriesFeb 13 2011Sep 01 2011We answer three related questions concerning the Haagerup subfactor and its even parts, the Haagerup fusion categories. Namely we find all simple module categories over each of the Haagerup fusion categories (in other words, we find the `"quantum subgroups" ... More

A Simple Isolation Criterion based on 3D Redshift Space MappingSep 22 2009We selected a sample of galaxies, extremely isolated in 3D redshift space, based on data from NED and the ongoing ALFALFA HI (21cm) survey. A simple selection criterion was employed: having no neighbors closer than 300 km/s in 3D redshift space. The environments ... More

Robust Constraint of Luminosity Function Evolution Through MCMC SamplingJul 03 2014Sep 30 2014We present a new galaxy survey simulation package, which combines the power of Markov Chain Monte Carlo (MCMC) sampling with a robust and adaptable model of galaxy evolution. The aim of this code is to aid in the characterization and study of new and ... More

Comment on "Detecting Novel Associations In Large Data Sets" by Reshef Et Al, Science Dec 16, 2011Jan 29 2014The proposal of Reshef et al. (2011) is an interesting new approach for discovering non-linear dependencies among pairs of measurements in exploratory data mining. However, it has a potentially serious drawback. The authors laud the fact that MIC has ... More

Adversarial Evaluation for Models of Natural LanguageJul 01 2012Jul 15 2012We now have a rich and growing set of modeling tools and algorithms for inducing linguistic structure from text that is less than fully annotated. In this paper, we discuss some of the weaknesses of our current methodology. We present a new abstract framework ... More

A Permutation Approach to Testing Interactions in Many DimensionsJun 27 2012To date, testing interactions in high dimensions has been a challenging task. Existing methods often have issues with sensitivity to modeling assumptions and heavily asymptotic nominal p-values. To help alleviate these issues, we propose a permutation-based ... More