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Results for "Duncan A. Brown"

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Reducing orbital eccentricity in binary black hole simulationsFeb 20 2007Apr 25 2007Binary black hole simulations starting from quasi-circular (i.e., zero radial velocity) initial data have orbits with small but non-zero orbital eccentricities. In this paper the quasi-equilibrium initial-data method is extended to allow non-zero radial ... More
Detection Prospects of Core-Collapse Supernovae with Supernova-Optimized Third-Generation Gravitational-wave DetectorsMay 31 2019We optimize the third-generation gravitational-wave detector to maximize the range to detect core-collapse supernovae. Based on three-dimensional simulations for core-collapse and the corresponding gravitational-wave waveform emitted, the corresponding ... More
Tidal Deformabilities and Radii of Neutron Stars from the Observation of GW170817Apr 23 2018Oct 30 2018We use gravitational-wave observations of the binary neutron star merger GW170817 to explore the tidal deformabilities and radii of neutron stars. We perform Bayesian parameter estimation with the source location and distance informed by electromagnetic ... More
Measuring the viewing angle of GW170817 with electromagnetic and gravitational wavesApr 11 2018Jun 08 2018The joint detection of gravitational waves (GWs) and electromagnetic (EM) radiation from the binary neutron star merger GW170817 ushered in a new era of multi-messenger astronomy. Joint GW-EM observations can be used to measure the parameters of the binary ... More
Data Access for LIGO on the OSGMay 17 2017During 2015 and 2016, the Laser Interferometer Gravitational-Wave Observatory (LIGO) conducted a three-month observing campaign. These observations delivered the first direct detection of gravitational waves from binary black hole mergers. To search for ... More
Photometric redshifts for the next generation of deep radio continuum surveys - II. Gaussian processes and hybrid estimatesDec 12 2017Apr 12 2018Building on the first paper in this series (Duncan et al. 2018), we present a study investigating the performance of Gaussian process photometric redshift (photo-z) estimates for galaxies and active galactic nuclei detected in deep radio continuum surveys. ... More
Posterior samples of the parameters of binary black holes from Advanced LIGO, Virgo's second observing runNov 22 2018Jun 03 2019This paper presents a parameter estimation analysis of the seven binary black hole mergers---GW170104, GW170608, GW170729, GW170809, GW170814, GW170818, and GW170823---detected during the second observing run of the Advanced LIGO and Virgo observatories ... More
Investigating the noise residuals around the gravitational wave event GW150914Nov 09 2018Feb 12 2019We use the Pearson cross-correlation statistic proposed by Liu and Jackson, and employed by Creswell et al., to look for statistically significant correlations between the LIGO Hanford and Livingston detectors at the time of the binary black hole merger ... More
PyCBC Inference: A Python-based parameter estimation toolkit for compact binary coalescence signalsJul 26 2018We introduce new modules in the open-source PyCBC gravitational- wave astronomy toolkit that implement Bayesian inference for compact-object binary mergers. We review the Bayesian inference methods implemented and describe the structure of the modules. ... More
Template banks to search for compact binaries with spinning components in gravitational wave dataApr 10 2009Gravitational waves from coalescing compact binaries are one of the most promising sources for detectors such as LIGO, Virgo and GEO600. If the components of the binary posess significant angular momentum (spin), as is likely to be the case if one component ... More
Gravitational waves from intermediate-mass-ratio inspirals for ground-based detectorsDec 11 2006Mar 13 2008We explore the prospects for Advanced LIGO to detect gravitational waves from neutron stars and stellar mass black holes spiraling into intermediate-mass ($M\sim 50 M_\odot$ to $350 M_\odot$) black holes. We estimate an event rate for such \emph{intermediate-mass-ratio ... More
Homogenization of lateral diffusion on a random surfaceJan 22 2014Jan 30 2014We study the problem of lateral diffusion on a static, quasi-planar surface generated by a stationary, ergodic random field possessing rapid small-scale spatial fluctuations. The aim is to study the effective behaviour of a particle undergoing Brownian ... More
High-accuracy comparison of numerical relativity simulations with post-Newtonian expansionsSep 30 2007Feb 21 2008Numerical simulations of 15 orbits of an equal-mass binary black hole system are presented. Gravitational waveforms from these simulations, covering more than 30 cycles and ending about 1.5 cycles before merger, are compared with those from quasi-circular ... More
Template Banks for Binary black hole searches with Numerical Relativity waveformsOct 29 2013Gravitational waves (GW) from coalescing stellar-mass black hole binaries (BBH) are expected to be detected by the Advanced Laser Interferometer Gravitational-wave Observatory and Advanced Virgo. Detection searches operate by matched-filtering the detector ... More
Custom Execution Environments with Containers in Pegasus-enabled Scientific WorkflowsMay 20 2019Science reproducibility is a cornerstone feature in scientific workflows. In most cases, this has been implemented as a way to exactly reproduce the computational steps taken to reach the final results. While these steps are often completely described, ... More
Searching for Gravitational Radiation from Binary Black Hole MACHOs in the Galactic HaloMay 10 2007The Laser Interferometer Gravitational Wave Observatory (LIGO) is one of a new generation of detectors of gravitational radiation. The existence of gravitational radiation was first predicted by Einstein in 1916, however gravitational waves have not yet ... More
Using the INSPIRAL program to search for gravitational waves from low-mass binary inspiralMay 19 2005The INSPIRAL program is the LIGO Scientific Collaboration's computational engine for the search for gravitational waves from binary neutron stars and sub-solar mass black holes. We describe how this program, which makes use of the FINDCHIRP algorithm ... More
Brownian Motion in an N-scale periodic PotentialMay 19 2016May 25 2016We study the problem of Brownian motion in a multiscale potential. The potential is assumed to have N+1 scales (i.e. N small scales and one macroscale) and to depend periodically on all the small scales. We show that for nonseparable potentials, i.e. ... More
Gravitational waveforms for neutron star binaries from binary black hole simulationsSep 18 2015Feb 25 2016Gravitational waves from binary neutron star (BNS) and black hole/neutron star (BHNS) inspirals are primary sources for detection by the Advanced Laser Interferometer Gravitational-Wave Observatory. The tidal forces acting on the neutron stars induce ... More
Meta-universality classes at criticalityFeb 27 2015Aug 31 2015Inferring the presence of critical dynamics from continuous measure- ments is a challenging problem. We solve this problem by showing that continuous narrowband dynamics from a critical system exhibit qualita- tively differing behaviors which depend on ... More
Heterogeneous Beliefs with Partial ObservationsJul 28 2009This paper examines a heterogeneous beliefs model in which there is a process that is only partially observed by the agents. The economy contains a risky asset producing dividends continuously in time. The dividends are observed by the agents. The dividends ... More
Implementing a search for aligned-spin neutron star -- black hole systems with advanced ground based gravitational wave detectorsMay 26 2014Oct 27 2014We study the effect of spins on searches for gravitational waves from compact binary coalescences in realistic simulated early advanced LIGO data. We construct a detection pipeline including matched filtering, signal-based vetoes, a coincidence test between ... More
CCharge-multiplicity dependence of single-particle transverse-rapidity $\bf y_t$ and pseudorapidity $\bf η$ densities and 2D angular correlations from 200 GeV $p$-$p$ collisionsDec 05 2015An established phenomenology and theoretical interpretation of $p$-$p$ collision data at lower collision energies should provide a reference for $p$-$p$ and other collision systems at higher energies, against which claims of novel physics may be tested. ... More
Improved isolation of the p-p underlying event based on minimum-bias trigger-associated hadron correlationsOct 01 2013Some aspects of hadron production in p-p collisions remain unresolved, including the low-hadron-momentum structure of high-parton-energy dijets, separation of triggered dijets from the underlying event (UE), the systematics of multiple parton interactions ... More
Transverse Momentum Correlations in Relativistic Nuclear CollisionsJun 17 2005From the correlation structure of transverse momentum $p_t$ in relativistic nuclear collisions we observe for the first time temperature/velocity structure resulting from low-$Q^2$ partons. Our novel analysis technique does not invoke an {\em a priori} ... More
A power-law description of heavy ion collision centralityNov 17 2004Jan 30 2007The minimum-bias distribution on heavy ion collision multiplicity $n_{ch}$ is well approximated by power-law form $n_{ch}^{-3/4}$, suggesting that a change of variable to $n_{ch}^{1/4}$ may provide more precise access to the structure of the distribution ... More
The Umbral Moonshine Module for the Unique Unimodular Niemeier Root SystemDec 28 2014We use canonically-twisted modules for a certain super vertex operator algebra to construct the umbral moonshine module for the unique Niemeier lattice that coincides with its root sublattice. In particular, we give explicit expressions for the vector-valued ... More
Photometric redshifts for the next generation of deep radio continuum surveys - I: Template fittingSep 26 2017We present a study of photometric redshift performance for galaxies and active galactic nuclei detected in deep radio continuum surveys. Using two multi-wavelength datasets, over the NOAO Deep Wide Field Survey Bo\"otes and COSMOS fields, we assess photometric ... More
Physical Effects of Distributed PV Generation on California's Distribution SystemJun 18 2015Deployment of high-penetration photovoltaic (PV) power is expected to have a range of effects -- both positive and negative -- on the distribution grid. The magnitude of these effects may vary greatly depending upon feeder topology, climate, PV penetration ... More
Shortcuts to Adiabaticity Assisted by Counterdiabatic Born-Oppenheimer DynamicsApr 02 2018Aug 08 2018Shortcuts to adiabaticity (STA) provide control protocols to guide the dynamics of a quantum system through an adiabatic reference trajectory in an arbitrary prescheduled time. Designing STA proves challenging in complex quantum systems when the dynamics ... More
The Spectral Energy Distributions of Active Galactic NucleiFeb 19 2019We present ongoing work on the spectral energy distributions (SEDs) of active galactic nuclei (AGNs), derived from X-ray, ultraviolet, optical, infrared and radio photometry and spectroscopy. Our work is motivated by new wide-field imaging surveys that ... More
Searching for Gravitational Waves from Binary Inspirals with LIGOMay 11 2007We describe the current status of the search for gravitational waves from inspiralling compact binary systems in LIGO data. We review the result from the first scientific run of LIGO (S1). We present the goals of the search of data taken in the second ... More
Decision Forests, Convolutional Networks and the Models in-BetweenMar 03 2016This paper investigates the connections between two state of the art classifiers: decision forests (DFs, including decision jungles) and convolutional neural networks (CNNs). Decision forests are computationally efficient thanks to their conditional computation ... More
Applicability study of the PRIMAD model to LIGO gravitational wave search workflowsApr 10 2019The PRIMAD model with its six components (i.e., Platform, Research Objective, Implementation, Methods, Actors, and Data), provides an abstract taxonomy to represent computational experiments and enforce reproducibility by design. In this paper, we assess ... More
Reassessing the formation of the inner Oort cloud in an embedded star clusterOct 24 2011We re-examine the formation of the inner Oort comet cloud while the Sun was in its birth cluster with the aid of numerical simulations. This work is a continuation of an earlier study (Brasser et al., 2006) with several substantial modifications. First, ... More
SciTokens: Capability-Based Secure Access to Remote Scientific DataJul 12 2018The management of security credentials (e.g., passwords, secret keys) for computational science workflows is a burden for scientists and information security officers. Problems with credentials (e.g., expiration, privilege mismatch) cause workflows to ... More
Discussion: "A significance test for the lasso"May 27 2014Discussion of "A significance test for the lasso" by Richard Lockhart, Jonathan Taylor, Ryan J. Tibshirani, Robert Tibshirani [arXiv:1301.7161].
Noetherian Hopf algebrasSep 14 2007This short survey article reviews current understand- ing of the structure of noetherian Hopf algebras. The focus is on homological properties. A number of open problems are listed.
Getting ready for the micro-arcsecond eraFeb 25 2008As the title of this symposium implies, one of the aims is to examine the future of astrometry as we move from an era in which thanks to the Hipparcos Catalogue everyone has become familiar with milliarcsecond astrometry to an era in which microarcsecond ... More
Evolution from OB Associations and Moving Groups to the Field PopulationJan 12 2001If we want to understand the evolution from star clusters to the Galactic field star population, the Solar neighbourhood is an ideal place to start. It contains objects from dense, very young clusters to old and almost dissolved moving groups. I describe ... More
ELSA and the frontiers of astrometrySep 12 2010ELSA stands for the ambitious goal of `European Leadership in Space Astrometry'. In this closing contribution I will examine how the ELSA network has advanced this goal. I also look ahead to the time when the Gaia data will be published and consider what ... More
The Gaia sky: version 1.0Sep 05 2017In this contribution I provide a brief summary of the contents of Gaia DR1. This is followed by a discussion of studies in the literature that attempt to characterize the quality of the Tycho-Gaia Astrometric Solution parallaxes in Gaia DR1, and I point ... More
Embedded contact knot homology and a surgery formulaFeb 11 2019Embedded contact knot homology (ECK) is a variation on Embedded contact homology (ECH), defined with respect to an open book decomposition compatible with a contact structure on some 3-manifold, M. The knot in question is given by the (null-homologous) ... More
Gaia, counting down to launchOct 13 2013In this contribution I provide an overview of the the European Space Agency's Gaia mission just ahead of its launch scheduled for November 2013.
Constraints on non-linear tides due to $p$-$g$ mode coupling from the neutron-star merger GW170817Aug 21 2018It has been suggested by Weinberg et al. (2013) that an instability due to nonlinear coupling of a neutron star's tide to its $p$- and $g$-modes could affect the gravitational-wave phase evolution of a neutron-star binary. Weinberg (2016) suggests that ... More
Variance Reduction using Nonreversible Langevin SamplersJun 16 2015Dec 28 2015A standard approach to computing expectations with respect to a given target measure is to introduce an overdamped Langevin equation which is reversible with respect to the target distribution, and to approximate the expectation by a time-averaging estimator. ... More
UBRI Photometry of Globular Clusters in the Leo Group Galaxy NGC 3379Jul 24 2003We present wide area UBRI photometry for globular clusters around the Leo group galaxy NGC 3379. Globular cluster candidates are selected from their B-band magnitudes and their (U-B)o vs (B-I)o colours. A colour-colour selection region was defined from ... More
Extending the baseline: Spitzer Mid-Infrared Photometry of Globular Cluster Systems in the Centaurus A and Sombrero GalaxiesJun 26 2008Spitzer IRAC mid-infrared photometry is presented for the globular cluster (GC) systems of the NGC 5128 ("Centaurus A") and NGC 4594 ("Sombrero") galaxies. Existing optical photometric and spectroscopic are combined with this new data in a comprehensive ... More
Discovery and redshift of an optical afterglow in 71 square degrees: iPTF13bxl and GRB 130702AJul 22 2013Oct 08 2013We report the discovery of the optical afterglow of the gamma-ray burst (GRB) 130702A, identified upon searching 71 square degrees surrounding the Fermi Gamma-ray Burst Monitor (GBM) localization. Discovered and characterized by the intermediate Palomar ... More
The Age, Metallicity and Alpha-Element Abundance of Galactic Globular Clusters from Single Stellar Population ModelsMay 31 2007May 31 2007Establishing the reliability with which stellar population parameters can be measured is vital to extragalactic astronomy. Galactic GCs provide an excellent medium in which to test the consistency of Single Stellar Population (SSP) models as they should ... More
The Correlation of Metallicity Gradient with Galaxy MassApr 18 2005Jun 24 2005A number of previous studies have searched for a correlation between radial metallicity gradients and early-type galaxy mass -- no convincing trends have been found. Here we re-examine this issue with several key enhancements: using total metallicity ... More
Ionization of Rydberg atoms embedded in an ultracold plasmaJan 09 2004Jan 05 2005We have studied the behavior of cold Rydberg atoms embedded in an ultracold plasma. We demonstrate that even deeply bound Rydberg atoms are completely ionized in such an environment, due to electron collisions. Using a fast pulse extraction of the electrons ... More
On the presence of nonjet "higher harmonic" components in 2D angular correlations from high energy heavy ion collisionsJun 23 2012It is conjectured that several higher harmonic flows $v_m$ may result from initial-state geometry fluctuations in \aa collisions coupled to a radially-expanding medium. But as with "elliptic flow" $v_2$ measurements, non-hydrodynamic mechanisms such as ... More
Centraliser Dimension and Universal Classes of GroupsFeb 23 2005In this paper we establish results that will be required for the study of the algebraic geometry of partially-commutative groups. We define classes of groups axiomatised by sentences determined by a graph. Among the classes which arise this way we find ... More
Parabolic and Quasiparabolic Subgroups of Free Partially Commutative GroupsFeb 14 2007Let S be a finite graph and G be the corresponding free partially commutative group. In this paper we study subgroups generated by vertices of the graph S, which we call canonical parabolic subgroups. A natural extension of the definition leads to canonical ... More
Stability of Universal Equivalence of Groups under Free ConstructionsApr 20 2008In 1971 J. Stallings introduced a generalisation of amalgamated products of groups -- called a pregroup, which is a particular kind of a partial group. He defined the universal group U(P) of a pregroup P to be a universal object (in the sense of category ... More
Supplementary Material for "Should we sample a time series more frequently? Decision support via multirate spectrum estimation (with discussion)"Apr 22 2016This technical report includes an assortment of technical details and extended discussions related to paper "Should we sample a time series more frequently? Decision support via multirate spectrum estimation (with discussion)", which introduces a model ... More
Primeness, semiprimeness and localisation in Iwasawa algebrasDec 20 2004Necessary and sufficient conditions are given for the completed group algebras of a compact p-adic analytic group with coefficient ring the p-adic integers or the field of p elements to be prime, semiprime and a domain. Necessary and sufficient conditions ... More
Ambiskew Hopf AlgebrasDec 15 2011Necessary and sufficient conditions are obtained for an ambiskew polynomial algebra A over a Hopf k-algebra R to possess the structure of a Hopf algebra extending that of R, in which the added variables X+ and X- are skew primitive. The coradical filtration ... More
Spectra of Tukey types of ultrafilters on Boolean algebrasJun 09 2014Mar 18 2015Extending recent investigations on the structure of Tukey types of ultrafilters on $\mathcal{P}(\omega)$ to Boolean algebras in general, we classify the spectra of Tukey types of ultrafilters for several classes of Boolean algebras, including interval ... More
Ring-theoretic properties of Iwasawa algebras: a surveyNov 14 2005This is a survey of the known properties of Iwasawa algebras, which are completed group rings of compact p-adic analytic groups with coefficients the ring Zp of p-adic integers or the field Fp of p elements. A number of open questions are also stated. ... More
Growing the gas-giant planets by the gradual accumulation of pebblesOct 07 2015It is widely held that the first step in forming the gas giant planets, such as Jupiter and Saturn, is to form solid `cores' of roughly 10 M$_\oplus$. Getting the cores to form before the solar nebula dissipates ($\sim\!1-10\,$Myr) has been a major challenge ... More
The Elliptical Galaxy formerly known as the Local Group: Merging the Globular Cluster SystemsJan 27 2000Prompted by a new catalogue of M31 globular clusters, we have collected together individual metallicity values for globular clusters in the Local Group. Although we briefly describe the globular cluster systems of the individual Local Group galaxies, ... More
Search for $WH \to \ell νb\bar{b}$ Final States at the TevatronOct 11 2011Latest results are presented in the search for low mass standard model Higgs production in association with a $W$ boson, based on large luminosity data samples collected at the CDF and D0 Experiments at the Fermilab Tevatron $p\bar{p}$ collider. The selection ... More
Hopf algebras under finiteness conditionsMay 16 2014This is a brief survey of some recent developments in the study of infinite dimensional Hopf algebras which are either noetherian or have finite Gelfand-Kirillov dimension. A number of open questions are listed.
Symplectic reflection algebras in positive characteristicSep 14 2007Basic properties of symplectic reflection algebras over an algebraically closed field k of positive characteristic are laid out. These algebras are always finite modules over their centres, in contrast to the situation in characteristic 0. For the subclass ... More
Study of Oxygen Diffusion and Clustering in Silicon using an Empirical Interatomic PotentialApr 25 1995The diffusion path and diffusivity of oxygen in crystalline silicon are computed using an empirical interatomic potential which was recently developed for modelling the interactions between oxygen and silicon atoms. The diffusion path is determined by ... More
Effect of eccentricity on binary neutron star searches in Advanced LIGOJan 09 2013Jun 07 2013Binary neutron stars (BNSs) are the primary source of gravitational waves for the Laser Interferometer Gravitational-Wave Observatory (LIGO) and its international partners Virgo and KAGRA. Current BNS searches target field binaries whose orbits will have ... More
The PyCBC search for gravitational waves from compact binary coalescenceAug 10 2015Sep 14 2016We describe the PyCBC search for gravitational waves from compact-object binary coalescences in advanced gravitational-wave detector data. The search was used in the first Advanced LIGO observing run and unambiguously identified two black hole binary ... More
Comparison of high-accuracy numerical simulations of black-hole binaries with stationary phase post-Newtonian template waveforms for Initial and Advanced LIGOJan 12 2009Jan 14 2009We study the effectiveness of stationary-phase approximated post-Newtonian waveforms currently used by ground-based gravitational-wave detectors to search for the coalescence of binary black holes by comparing them to an accurate waveform obtained from ... More
Cosmic Explorer: The U.S. Contribution to Gravitational-Wave Astronomy beyond LIGOJul 10 2019This white paper describes the research and development needed over the next decade to realize "Cosmic Explorer," the U.S. node of a future third-generation detector network that will be capable of observing and characterizing compact gravitational-wave ... More
The Effect of Eccentricity on Searches for Gravitational-Waves from Coalescing Compact Binaries in Ground-based DetectorsSep 01 2009Feb 15 2010Inspiralling compact binaries are expected to circularize before their gravitational-wave signals reach the sensitive frequency band of ground-based detectors. Current searches for gravitational waves from compact binaries using the LIGO and Virgo detectors ... More
Gaia: on the road to DR2Oct 30 2017Nov 03 2017The second Gaia data release (DR2) is scheduled for April 2018. While Gaia DR1 had increased the number of stars with parallaxes by a factor 20 with respect to the Hipparcos catalogue, Gaia DR2 will bring another factor 500 increase, with parallaxes (and ... More
Heterogeneous Beliefs with Finite-Lived AgentsJul 28 2009This paper will examine a model with many agents, each of whom has a different belief about the dynamics of a risky asset. The agents are Bayesian and so learn about the asset over time. All agents are assumed to have a finite (but random) lifetime. When ... More
Finite Groups of Essential Dimension 2Dec 09 2009Sep 25 2010We classify all finite groups of essential dimension 2 over an algebraically closed field of characteristic 0.
SciTokens: Demonstrating Capability-Based Access to Remote Scientific Data using HTCondorMay 22 2019The management of security credentials (e.g., passwords, secret keys) for computational science workflows is a burden for scientists and information security officers. Problems with credentials (e.g., expiration, privilege mismatch) cause workflows to ... More
The Archimedean limit of random sorting networksFeb 25 2018Mar 19 2018A sorting network (also known as a reduced decomposition of the reverse permutation), is a shortest path from $12 \cdots n$ to $n \cdots 21$ in the Cayley graph of the symmetric group $S_n$ generated by adjacent transpositions. We prove that in a uniform ... More
When universal edge-colored directed graph $C^*$-algebras are exactJul 22 2013May 12 2016We consider when the universal $C^*$-algebras associated to edge-colored directed graphs are exact. Specifically, for countable edge-colored directed graphs we show that the universal $C^*$-algebra is exact if and only if the $C^*$-algebra is isomorphic ... More
Essential Dimensions of A_7 and S_7Aug 22 2009We show that Y. Prokhorov's "Simple Finite Subgroups of the Cremona Group of Rank 3" implies that, over any field of characteristic 0, the essential dimensions of the alternating group, A_7, and the symmetric group, S_7, are 4.
A necessary and sufficient condition for global convergence of the complex zeros of random orthogonal polynomialsJan 22 2019Consider random polynomials of the form $G_n = \sum_{i=0}^n \xi_i p_i$, where the $\xi_i$ are i.i.d. non-degenerate complex random variables, and $\{p_i\}$ is a sequence of orthonormal polynomials with respect to a regular measure $\tau$ supported on ... More
Twisted forms of toric varietiesAug 18 2014Jan 19 2016We consider the set of forms of a toric variety over an arbitrary field: those varieties which become isomorphic to a toric variety after base field extension. In contrast to most previous work, we also consider arbitrary isomorphisms rather than just ... More
The Archimedean limit of random sorting networksFeb 25 2018Jun 22 2019A sorting network (also known as a reduced decomposition of the reverse permutation), is a shortest path from $12 \cdots n$ to $n \cdots 21$ in the Cayley graph of the symmetric group $S_n$ generated by adjacent transpositions. We prove that in a uniform ... More
A multiscale analysis of diffusions on rapidly varying surfacesNov 05 2013Nov 10 2013Lateral diffusion of molecules on surfaces plays a very important role in various biological processes, including lipid transport across the cell membrane, synaptic transmission and other phenomena such as exo- and endocytosis, signal transduction, chemotaxis ... More
Effective Nucleon-Nucleon Interaction and Fermi Liquid TheoryOct 12 2001We present two novel relations between the quasiparticle interaction in nuclear matter and the unique low momentum nucleon-nucleon interaction in vacuum. These relations provide two independent constraints on the Fermi liquid parameters of nuclear matter. ... More
Polarized single crystal neutron diffraction study of the zero-magnetization ferromagnet Sm$_{1-x}$Gd$_x$Al$_2$ (x = 0.024)Nov 16 2017We have determined the temperature evolution of the spin and orbital moments in the zero magnetization ferromagnet Sm$_{1-x}$Gd$_x$Al$_2$ (x = 0.024) by combining polarized and unpolarized single crystal neutron diffraction data. The sensitivity of the ... More
Single crystal polarized neutron diffraction study of the magnetic structure of HoFeO$_3$Jun 15 2017Polarised neutron diffraction measurements have been made on HoFeO$_3$ single crystals magnetised in both the [001] and [100] directions ($Pbnm$ setting). The polarisation dependencies of Bragg reflection intensities were measured both with a high field ... More
The Rees product of posetsSep 23 2010We determine how the flag f-vector of any graded poset changes under the Rees product with the chain, and more generally, any t-ary tree. As a corollary, the M\"obius function of the Rees product of any graded poset with the chain, and more generally, ... More
Prime regular Hopf Algebras of GK-dimension OneJul 29 2008This paper constitutes the first part of a program to classify all affine prime regular Hopf algebras $H$ of Gelfand-Kirillov dimension one over an algebraically closed field of characteristic zero. We prove a number of properties of such an algebra, ... More
The 3 $μ$m Spectrum of Jupiter's Irregular Satellite HimaliaSep 03 2014We present a medium resolution spectrum of Jupiter's irregular satellite Himalia covering the critical 3 $\mu$m spectral region. The spectrum shows no evidence for aqueously altered phyllosilicates, as had been suggested from the tentative detection of ... More
Azumaya loci and discriminant ideals of PI algebrasFeb 14 2017Sep 20 2017We prove that, under mild assumptions, for all positive integers $\ell$, the zero set of the discriminant ideal $D_{\ell}(R/Z(R); tr)$ of a prime polynomial identity (PI) algebra $R$ coincides with the zero set of the modified discriminant ideal $MD_{\ell}(R/Z(R); ... More
Empirical bias and efficiency of alpha-auctions: experimental evidenceMay 09 2019We experimentally evaluate the comparative performance of the winner-bid, average-bid, and loser-bid auctions for the dissolution of a partnership. The recently introduced empirical equilibrium analysis of Velez and Brown (2019) reveals that as long as ... More
Relativistic Jet Stability and Structure from the Alfven Point OutwardsJun 30 1999The amplitude of jet distortions and accompanying pressure and velocity fluctuations resulting from Kelvin-Helmholtz instability of three dimensional relativistic jets are explored. The effect of instability on jets as they accelerate from sub- to super-Alfv\'enic ... More
Mixing processes during the evolution of red giants with moderate metal deficiencies : the role of molecular-weight barriersDec 16 1997We have assembled accurate abundance data for Li, C, and N as well as the 12C/13C ratio for five field giants with [Fe/H]=-0.6 including Arcturus and two stars in the globular cluster 47 Tuc. Using their very precise Mbol values obtained from HIPPARCOSparallaxes, ... More
Pulling cargo increases the precision of molecular motor progressMay 23 2018May 22 2019Biomolecular motors use free energy to drive a variety of cellular tasks, including the transport of cargo, such as vesicles and organelles. We find that the widely-used `constant-force' approximation for the effect of cargo on motor dynamics leads to ... More
Renormalization Group Methods for the Nuclear Many-Body ProblemFeb 27 2003The application of renormalization group methods to microscopic nuclear many-body calculations is discussed. We present the solution of the renormalization group equations in the particle-hole channels for neutron matter and the application to S-wave ... More
Anomalous quantum and isotope effects in water clusters: Physical phenomenon, model artifact, or bad approximation?Sep 29 2014Free energy differences $\Delta F:=F-F_{\text{prism}}$ are computed for several isomers of water hexamer relative to the "prism" isomer using the self-consistent phonons method. %$\Delta F:=F-F({prism})$ We consider the isotope effect defined by the quantity ... More
Mapping the dark matter with polarized radio surveysJan 26 2011In a recent paper (Brown & Battye 2011), we proposed the use of integrated polarization measurements of background galaxies in radio weak gravitational lensing surveys and investigated the potential impact on the statistical measurement of cosmic shear. ... More
Pulling cargo increases the precision of molecular motor progressMay 23 2018Jun 27 2019Biomolecular motors use free energy to drive a variety of cellular tasks, including the transport of cargo, such as vesicles and organelles. We find that the widely-used `constant-force' approximation for the effect of cargo on motor dynamics leads to ... More
Negative Poisson's ratio and semi-soft elasticity of smectic-C liquid crystal elastomersJul 27 2011Jul 28 2011Models of smectic-C liquid crystal elastomers predict that it can display soft elasticity, in which the shape of the elastomer changes at no energy cost. The amplitude of the soft mode and the accompanying shears are dependent on the orientation of the ... More
The paradox of monotone structural QREMay 14 2019McKelvey and Palfrey (1995)'s monotone structural Quantal Response Equilibrium theory may be misspecified for the study of monotone behavior.