Results for "Howard D. Bondell"

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Deep Distribution RegressionMar 14 2019Due to their flexibility and predictive performance, machine-learning based regression methods have become an important tool for predictive modeling and forecasting. However, most methods focus on estimating the conditional mean or specific quantiles ... More
Variable selection via penalized credible regions with Dirichlet-Laplace global-local shrinkage priorsFeb 03 2016Aug 31 2016The method of Bayesian variable selection via penalized credible regions separates model fitting and variable selection. The idea is to search for the sparsest solution within the joint posterior credible regions. Although the approach was successful, ... More
High Dimensional Linear Regression via the R2-D2 Shrinkage PriorAug 31 2016We propose a new class of priors for linear regression, the R-square induced Dirichlet Decomposition (R2-D2) prior. The prior is induced by a Beta prior on the coefficient of determination, and then the total prior variance of the regression coefficients ... More
A nonparametric Bayesian test of dependenceJan 28 2015In this article, we propose a new method for the fundamental task of testing for dependence between two groups of variables. The response densities under the null hypothesis of independence and the alternative hypothesis of dependence are specified by ... More
On the Origin of Narrow, Very Long, Straight Jets from Some Newly Forming StarsApr 29 1997Observations have shown the existence of narrow, very long, straight jets emitted by some newly forming stars (1). It is highly likely that stars forming in the plane of a spiral galaxy do so in the presence of an almost uniform magnetic field. In the ... More
Geodesics and Spanning Trees for Euclidean First-Passage PercolationOct 21 2000The metric $D_\alpha (q,q')$ on the set $Q$ of particle locations of a homogeneous Poisson process on $R^d$, defined as the infimum of $(\sum_i |q_i - q_{i+1}|^\alpha)^{1/\alpha}$ over sequences in $Q$ starting with $q$ and ending with $q'$ (where $| ... More
Partially Paradoxist Smarandache GeometriesOct 08 2001A paradoxist Smarandache geometry combines Euclidean, hyperbolic, and elliptic geometry into one space along with other non-Euclidean behaviors of lines that would seem to require a discrete space. A class of continuous spaces is presented here together ... More
On the averaged Colmez conjectureNov 01 2018Dec 04 2018This is an expository article on the averaged version of Colmez's conjecture, relating Faltings heights of CM abelian varieties to Artin L-functions. It is based on the author's lectures at the Current Developments in Mathematics conference held at Harvard ... More
On the Ekedahl-Oort stratification of Shimura curvesOct 20 2018We study the Hodge-Tate period domain associated to a quaternionic Shimura curve at a prime of bad reduction, and give an explicit description of its Ekedahl-Oort stratification.
Unirationality of moduli spaces of special cubic fourfolds and K3 surfacesMar 18 2015Jun 14 2016We provide explicit descriptions of the generic members of Hassett's divisors $\mathcal C_d$ for relevant $18\leq d\leq 38$ and for $d=44$. In doing so, we prove that $\mathcal C_d$ is unirational for $18\leq d\leq 38,d=44$. As a corollary, we prove that ... More
Projectivity and Birational Geometry of Bridgeland Moduli spaces on an Enriques SurfaceJun 04 2014Jul 15 2014We construct moduli spaces of semistable objects on an Enriques surface for generic Bridgeland stability condition and prove their projectivity. We further generalize classical results about moduli spaces of semistable sheaves on an Enriques surface to ... More
Convex Bodies of Constant Width and Constant BrightnessJun 30 2003In 1926 S. Nakajima (= A. Matsumura) showed that any convex body in $\R^3$ with constant width, constant brightness, and boundary of class $C^2$ is a ball. We show that the regularity assumption on the boundary is unnecessary, so that balls are the only ... More
Radio Weak BL Lac objects in the Fermi eraJan 21 2017The existence of "radio weak BL Lac objects" (RWBLs) has been an open question, still unsolved, since the discovery that quasars could be radio-quiet or radio-loud. Recently several groups identified RWBL candidates, mostly found while searching for low ... More
Forming the Borromean Rings out of arbitrary polygonal unknotsJun 12 2014We prove the perhaps surprising result that given any three polygonal unknots in $\R^3$, then we may form the Borromean rings out of them through rigid motions of $\R^3$ applied to the individual components together with possible scaling of the components. ... More
The California-Kepler Survey. IV. Metal-rich Stars Host a Greater Diversity of PlanetsDec 11 2017Jan 21 2018Probing the connection between a star's metallicity and the presence and properties of any associated planets offers an observational link between conditions during the epoch of planet formation and mature planetary systems. We explore this connection ... More
The Molecular Gas-Star Formation Connection in an Optically-Selected Sample of Interacting GalaxiesNov 10 1999We have obtained CO(1-0) observations for a sample of 37 interacting galaxy systems, chosen from a parent sample of optically-selected interacting galaxies. The sample observed here spans a large range of interaction strengths and star formation rates ... More
Carbon in the Draco Dwarf Spheroidal GalaxyMar 13 2013Measurements of [C/Fe], [Ca/H], and [Fe/H] have been derived from Keck I LRISb spectra of 35 giants in the Draco dwarf spheroidal galaxy. The iron abundances are derived by a spectrum synthesis modeling of the wavelength region from 4850 to 5375 A, while ... More
Our Milky Way as a Pure-Disk Galaxy -- A Challenge for Galaxy FormationMay 03 2010Jul 20 2010Bulges are commonly believed to form in the dynamical violence of galaxy collisions and mergers. Here we model the stellar kinematics of the Bulge Radial Velocity Assay (BRAVA), and find no sign that the Milky Way contains a classical bulge formed by ... More
A Coronal Hole's Effects on CME Shock Morphology in the Inner HeliosphereJun 15 2012We use STEREO imagery to study the morphology of a shock driven by a fast coronal mass ejection (CME) launched from the Sun on 2011 March 7. The source region of the CME is located just to the east of a coronal hole. The CME ejecta is deflected away from ... More
The Frequency of Hot Jupiters Orbiting Nearby Solar-Type StarsMay 10 2012We determine the fraction of F, G, and K dwarfs in the Solar Neighborhood hosting hot jupiters as measured by the California Planet Survey from the Lick and Keck planet searches. We find the rate to be 1.2\pm0.38%, which is consistent with the rate reported ... More
Extension of the Planar Noh Problem to Aluminum, Iron, Copper, and TungstenAug 30 2017The classic Noh verification test problem is extended beyond the traditional ideal gas and applied to shock compression of condensed matter. Using the stiff-gas equation of state (EOS), which admits an exact analytical solution for the planar Noh problem, ... More
Chandra X-ray Observations of the 0.6 < z < 1.1 Red-Sequence Cluster Survey SampleOct 29 2007We present the results of Chandra observations of 13 optically-selected clusters with 0.6<z< 1.1, discovered via the Red-sequence Cluster Survey (RCS). All but one are detected at S/N>3; though 3 were not observed long enough to support detailed analysis. ... More
Spectral Evidence for Amorphous Silicates in Least-processed CO Meteorites and Their Parent BodiesFeb 02 2018Least-processed carbonaceous chondrites (carbonaceous chondrites that have experienced minimal aqueous alteration and thermal metamorphism) are characterized by their predominately amorphous iron-rich silicate interchondrule matrices and chondrule rims. ... More
Optical evidence of the chiral magnetic anomaly in Weyl semimetal TaAsOct 12 2018Mar 01 2019Chiral pumping from optical electric fields oscillating at THz frequencies is observed in the Weyl material TaAs with electric and magnetic fields aligned along both the a- and c-axes. Free carrier spectral weight enhancement is measured directly for ... More
Phonons and superconductivity in YbC$_6$ and related compoundsSep 15 2010The out-of-plane intercalate phonons of superconducting YbC6 have been measured with inelastic x-ray scattering. Model fits to this data, and previously measured out-of-plane intercalate phonons in graphite intercalation compounds (GICs), reveal surprising ... More
The California-Kepler Survey. II. Precise Physical Properties of 2025 Kepler Planets and Their Host StarsMar 30 2017Jun 16 2017We present stellar and planetary properties for 1305 Kepler Objects of Interest (KOIs) hosting 2025 planet candidates observed as part of the California-Kepler Survey. We combine spectroscopic constraints, presented in Paper I, with stellar interior modeling ... More
Stability of undercompressive shock profilesAug 11 2004Aug 14 2004Using a simplified pointwise iteration scheme, we establish nonlinear phase-asymptotic orbital stability of large-amplitude Lax, undercompressive, overcompressive, and mixed under--overcompressive type shock profiles of strictly parabolic systems of conservation ... More
Maximal Proper Acceleration and the Quantum-to-Classical TransitionOct 31 2013I first review the physical basis for the universal maximal proper acceleration. Next, I introduce a new formulation for a relativistic scalar quantum field which generalizes the canonical theory to include the limiting proper acceleration. This field ... More
On a generalization of the generating function for Gegenbauer polynomialsMay 13 2011Jan 17 2013A generalization of the generating function for Gegenbauer polynomials is introduced whose coefficients are given in terms of associated Legendre functions of the second kind. We discuss how our expansion represents a generalization of several previously ... More
A Semple Approach to Goursat: The Multi-Flag CaseFeb 21 2013In this note we summarize our results from earlier work with the Monster Tower (A Monster Tower Approach to Goursat Multi-Flags). In particular, we give an overview of the problem of classifying the orbits within a tower of fibrations with fibers diffeomorphic ... More
Quantum Modified MoosesSep 04 2002Jul 31 2003We summarize our findings on the quantum moduli constraints and superpotentials of an infinite family of moose extensions of $n_f = n_c$ SUSY QCD. For $n_c=2$, we perform concrete calculations using traditional integrating out techniques as well as Intriligator's ... More
A short note on the multiplier ideals of monomial space curvesJun 06 2014Nov 11 2015Thompson (2014) exhibits a formula for the multiplier ideal with multiplier lambda of a monomial curve C with ideal I as an intersection of a term coming from the I-adic valuation, the multiplier ideal of the term ideal of I, and terms coming from certain ... More
Smooth convex Bodies with proportional projection functionsAug 02 2004For a convex body $K\subset\R^n$ and $i\in\{1,...,n-1\}$, the function assigning to any $i$-dimensional subspace $L$ of $\R^n$, the $i$-dimensional volume of the orthogonal projection of $K$ to $L$, is called the $i$-th projection function of $K$. Let ... More
Constraints on the Obliquities of Kepler Planet-Hosting StarsOct 12 2017Nov 24 2017Stars with hot Jupiters have obliquities ranging from 0-180 degrees, but relatively little is known about the obliquities of stars with smaller planets. Using data from the California-Kepler Survey, we investigate the obliquities of stars with planets ... More
The California-Kepler Survey. III. A Gap in the Radius Distribution of Small PlanetsMar 30 2017Jun 16 2017The size of a planet is an observable property directly connected to the physics of its formation and evolution. We used precise radius measurements from the California-Kepler Survey (CKS) to study the size distribution of 2025 $\textit{Kepler}$ planets ... More
Optical spectroscopic observations of gamma-ray blazar candidates IV. Results of the 2014 follow-up campaignMar 17 2015The extragalactic gamma-ray sky is dominated by the emission arising from blazars, one of the most peculiar classes of radio-loud active galaxies. Since the launch of Fermi several methods were developed to search for blazars as potential counterparts ... More
CR structures on open manifoldsMay 07 2014We show that the vanishing of the higher dimensional homology groups of a manifold ensures that every almost CR structure of codimension $k$ may be homotoped to a CR structure. This result is proved by adapting a method due to Haefliger used to study ... More
Matroids and Geometric Invariant Theory of torus actions on flag spacesNov 24 2005Feb 14 2006We apply a theorem of Gel'fand, Goresky, MacPherson, and Serganova about matroid polytopes to study semistability of partial flags relative to a T-linearized ample line bundle of a flag space F = SL(n)/P where T is a maximal torus in SL(n) and P is a ... More
Pointwise Asymptotic Behavior of Perturbed Viscous Shock ProfilesMar 28 2005Mar 29 2005We consider the asymptotic behavior of perturbations of Lax and overcompressive type viscous shock profiles arising in systems of regularized conservation laws with strictly parabolic viscosity, and also in systems of conservation laws with partially ... More
Precise Radial Velocities of 2046 Nearby FGKM Stars and 131 StandardsJul 26 2012Aug 01 2012We present radial velocities with an accuracy of 0.1 km/s for 2046 stars of spectral type F,G,K, and M, based on 29000 spectra taken with the Keck I telescope. We also present 131 FGKM standard stars, all of which exhibit constant radial velocity for ... More
The Stellar Obliquity and the Long-period planet in the HAT-P-17 Exoplanetary SystemJan 26 2013Jul 22 2013We present the measured projected obliquity -- the sky-projected angle between the stellar spin axis and orbital angular momentum -- of the inner planet of the HAT-P-17 multi-planet system. We measure the sky-projected obliquity of the star to be \lambda=19+/-15 ... More
Retired A Stars and Their Companions: Eighteen New Jovian PlanetsAug 21 2011We report the detection of eighteen Jovian planets discovered as part of our Doppler survey of subgiant stars at Keck Observatory, with follow-up Doppler and photometric observations made at McDonald and Fairborn Observatories, respectively. The host ... More
Optical spectroscopic observations of gamma-ray blazar candidates III. The 2013/2014 campaign in the Southern HemisphereMar 16 2015We report the results of our exploratory program carried out with the Southern Astrophysical Research (SOAR) telescope aimed at associating counterparts and establishing the nature of the Fermi Unidentified gamma-ray Sources (UGS). We selected the optical ... More
Multiplier ideals of monomial space curvesJun 09 2010Feb 22 2011The goal of this paper is to produce a formula for the multiplier ideals of monomial space curves in the spirit of Howald's formula for the multiplier ideals of monomial ideals. This is achieved by constructing a toric blowup of affine space in such a ... More
The set of non-uniquely ergodic d-IETs has Hausdorff codimension 1/2Jan 02 2018We show that the set of not uniquely ergodic d-IETs has Hausdorff dimension d-3/2 (in the (d-1)-dimension space of d-IETs) for d>4. For d=4 this was shown by Athreya-Chaika and for d=2,3 the set is known to have dimension d-2.
Tangent cones and regularity of real hypersurfacesMay 16 2010Sep 14 2013We characterize embedded $\C^1$ hypersurfaces of $\R^n$ as the only locally closed sets with continuously varying flat tangent cones whose measure-theoretic-multiplicity is at most $m<3/2$. It follows then that any (topological) hypersurface which has ... More
KIC 8164262: a Heartbeat Star Showing Tidally Induced Pulsations with Resonant LockingJun 15 2017Oct 12 2017We present the analysis of KIC 8164262, a heartbeat star with a high-amplitude (~1 mmag), tidally resonant pulsation (a mode in resonance with the orbit) at 229 times the orbital frequency and a plethora of tidally induced g-mode pulsations (modes excited ... More
A Gross-Kohnen-Zagier formula for Heegner-Drinfeld cyclesJul 01 2017Let $F$ be the field of rational functions on a smooth projective curve over a finite field, and let $\pi$ be an unramified cuspidal automorphic representation for $\mathrm{PGL}_2$ over $F$. We prove a variant of the formula of Yun and Zhang relating ... More
Derivatives with respect to the degree and order of associated Legendre functions for $|z|>1$ using modified Bessel functionsNov 27 2009Expressions for the derivatives with respect to order of modified Bessel functions evaluated at integer orders and certain integral representations of associated Legendre functions with modulus argument greater than unity are used to compute derivatives ... More
Intrinsic Chirality of Graphs in 3-manifoldsJun 12 2014Nov 17 2016The main result of this paper is that for every closed, connected, orientable, irreducible 3-manifold $M$, there is an integer $ n_M$ such that any abstract graph with no automorphism of order 2 which has a 3-connected minor whose genus is more than $n_M$ ... More
The Maslov and Morse Indices for Sturm-Liouville Systems on the Half-LineMar 18 2019We show that for Sturm-Liouville Systems on the half-line $[0,\infty)$, the Morse index can be expressed in terms of the Maslov index and an additional term associated with the boundary conditions at $x = 0$. Relations are given both for the case in which ... More
MMP Via Wall-crossing for Moduli Spaces of Stable Sheaves on an Enriques surfaceJan 13 2019We use wall-crossing in the Bridgeland stability manifold to systematically study the birational geometry of the moduli space $M_\sigma(\mathbf{v})$ of $\sigma$-semistable objects of class $\mathbf{v}$ for a generic stability condition $\sigma$ on an ... More
Clifford group and stabilizer states from Chern-Simons theoryMar 15 2019The construction of generators of the Clifford group and of stabilizer states from Chern-Simons theory is presented for the Kac-Moody algebras SU(2)1, U(N)N,N(K+N) with N = 2 and K = 1, and SU(N)1 extending results of Salton, et. al.
Total diameter and area of closed submanifoldsDec 04 2013Jan 18 2015The total diameter of a closed planar curve $C\subset R^2$ is the integral of its antipodal chord lengths. We show that this quantity is bounded below by twice the area of $C$. Furthermore, when $C$ is convex or centrally symmetric, the lower bound is ... More
Nakajima's problem: convex bodies of constant width and constant brightnessJan 20 2006For a convex body $K\subset\R^n$, the $k$th projection function of $K$ assigns to any $k$-dimensional linear subspace of $\R^n$ the $k$-volume of the orthogonal projection of $K$ to that subspace. Let $K$ and $K_0$ be convex bodies in $\R^n$, and let ... More
PTF 14jg: The Remarkable Outburst and Post-Burst Evolution of a Previously Anonymous Galactic StarJan 30 2019We report the outbursting source PTF 14jg, which prior to the onset of its late 2013 eruption, was a faint, unstudied, and virtually uncatalogued star. The salient features of the PTF 14jg outburst are: (i) projected location near the W4 HII region and ... More
Merger Signatures in the Dynamics of Star-forming GasNov 26 2015Spatially resolved kinematics have been used to determine the dynamical status of star-forming galaxies with ambiguous morphologies, and constrain the importance of galaxy interactions during the assembly of galaxies. However, measuring the importance ... More
Friends of Hot Jupiters II: No Correspondence Between Hot-Jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar CompanionsDec 30 2014Jan 13 2015Multi-star systems are common, yet little is known about a stellar companion's influence on the formation and evolution of planetary systems. For instance, stellar companions may have facilitated the inward migration of hot Jupiters towards to their present ... More
A Correlation Between Stellar Activity and Hot Jupiter Emission SpectraApr 15 2010Jul 22 2010We present evidence for a correlation between the observed properties of hot Jupiter emission spectra and the activity levels of the host stars measured using Ca II H & K emission lines. We find that planets with dayside emission spectra that are well-described ... More
Learning Null Space Projections in Operational Space FormulationJul 26 2016In recent years, a number of tools have become available that recover the underlying control policy from constrained movements. However, few have explicitly considered learning the constraints of the motion and ways to cope with unknown environment. In ... More
Centre-finding in E. coli and the role of mathematical modelling: past, present and futureJan 18 2019We review the key role played by mathematical modelling in elucidating two centre-finding patterning systems in E. coli: midcell division positioning by the MinCDE system and DNA partitioning by the ParABS system. We focus particularly on how, despite ... More
Chromospheric Activity and Jitter Measurements for 2630 Stars on the California Planet SearchSep 13 2010We present time series measurements of chromospheric activity for more than 2600 main sequence and subgiant stars on the California Planet Search (CPS) program with spectral types ranging from about F5V to M4V for main sequence stars and from G0IV to ... More
Basis-independent methods for the two-Higgs-doublet modelApr 06 2005Nov 27 2005In the most general two-Higgs-doublet model (2HDM), unitary transformations between the two Higgs fields do not change the functional form of the Lagrangian. All physical observables of the model must therefore be independent of such transformations (i.e., ... More
Inelastic X-ray Scattering Study of Phonons in Superconducting CaC6Sep 08 2007Oct 30 2007We investigate the dispersion and temperature dependence of a number of phonons in the recently discovered superconductor CaC6 utilizing inelastic x-ray scattering. Four [00L] and two ab-plane phonon modes are observed, and measured at temperatures both ... More
An Excess of Mid-Infrared Emission from the Type Iax SN 2014dtOct 27 2015Supernovae Type Iax (SNe Iax) are less energetic and less luminous than typical thermonuclear explosions. A suggested explanation for the observed characteristics of this subclass is a binary progenitor system consisting of a CO white dwarf primary accreting ... More
K2-136: A Hyades Binary Star with a Neptune-sized PlanetSep 29 2017Nov 06 2017We report the discovery of a Neptune-size planet (Rp = 3.0 Re) in the Hyades Cluster. The host star is in a binary system, comprising a K5V star and M7/8V star with a projected separation of 40 AU. The planet orbits the primary star with an orbital period ... More
Avalanches on a conical bead pile: scaling with tuning parametersJan 02 2012Feb 24 2012Uniform spherical beads were used to explore the behavior of a granular system near its critical angle of repose on a conical bead pile. We found two tuning parameters that could take the system to a critical point where a simple power-law described the ... More
The Photoeccentric Effect and Proto-Hot Jupiters II. KOI-1474.01, a candidate eccentric planet perturbed by an unseen companionJun 25 2012Nov 02 2012The exoplanets known as hot Jupiters---Jupiter-sized planets with periods less than 10 days---likely are relics of dynamical processes that shape all planetary system architectures. Socrates et al. (2012) argued that high eccentricity migration (HEM) ... More
Separation of variables in an asymmetric cyclidic coordinate systemJan 16 2013A global analysis is presented of solutions for Laplace's equation on three-dimensional Euclidean space in one of the most general orthogonal asymmetric confocal cyclidic coordinate systems which admit solutions through separation of variables. We refer ... More
An adaptive reduced basis collocation method based on PCM ANOVA decomposition for anisotropic stochastic PDEsSep 25 2017The combination of reduced basis and collocation methods enables efficient and accurate evaluation of the solutions to parameterized PDEs. In this paper, we study the stochastic collocation methods that can be combined with reduced basis methods to solve ... More
A 2 Earth Radius Planet Orbiting the Bright Nearby K-Dwarf Wolf 503Jun 09 2018Since its launch in 2009, the Kepler telescope has found thousands of planets with radii between that of Earth and Neptune. Recent studies of the distribution of these planets have revealed a rift in the population near 1.5-2.0$R_{\bigoplus}$, informally ... More
Quarkonium spin structure in lattice NRQCDNov 25 1996Numerical simulations of the quarkonium spin splittings are done in the framework of lattice nonrelativistic quantum chromodynamics (NRQCD). At leading order in the velocity expansion the spin splittings are of $O(M_Q v^4)$, where $M_Q$ is the renormalized ... More
Numerical Solution of the Steady-State Navier-Stokes Equations using Empirical Interpolation MethodsMay 19 2016Reduced-order modeling is an efficient approach for solving parameterized discrete partial differential equations when the solution is needed at many parameter values. An offline step approximates the solution space and an online step utilizes this approximation, ... More
A Low-Rank Multigrid Method for the Stochastic Steady-State Diffusion ProblemDec 16 2016Apr 08 2017We study a multigrid method for solving large linear systems of equations with tensor product structure. Such systems are obtained from stochastic finite element discretization of stochastic partial differential equations such as the steady-state diffusion ... More
K2-66b and K2-106b: Two extremely hot sub-Neptune-size planets with high densitiesMay 09 2017We report precise mass and density measurements of two extremely hot sub-Neptune-size planets from the K2 mission using radial velocities, K2 photometry, and adaptive optics imaging. K2-66 harbors a close-in sub-Neptune-sized (2.49$^{+0.34}_{-0.24} R_\oplus$) ... More
The California-Kepler Survey. I. High Resolution Spectroscopy of 1305 Stars Hosting Kepler Transiting PlanetsMar 30 2017Jun 16 2017The California-Kepler Survey (CKS) is an observational program to improve our knowledge of the properties of stars found to host transiting planets by NASA's Kepler Mission. The improvement stems from new high-resolution optical spectra obtained using ... More
Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignmentsJun 26 2012Jul 23 2012We provide evidence that the obliquities of stars with close-in giant planets were initially nearly random, and that the low obliquities that are often observed are a consequence of star-planet tidal interactions. The evidence is based on 14 new measurements ... More
An upper bound on $P$-wave charmonium production via the color-octet mechanismNov 11 1993A factorization theorem for $P$-wave quarkonium production, recently derived by Bodwin, Braaten, Yuan and Lepage, is applied to $\Upsilon \to \chi_{cJ} + X$, where $\chi_{cJ}$ labels the ${}^3 P_J$ charmonium states. The widths for $\chi_{cJ}$ production ... More
Characterizing the Cool KOIs III. KOI-961: A Small Star with Large Proper Motion and Three Small PlanetsJan 10 2012We present the characterization of the star KOI 961, an M dwarf with transit signals indicative of three short-period exoplanets, originally discovered by the Kepler Mission. We proceed by comparing KOI 961 to Barnard's Star, a nearby, well-characterized ... More
Adjoint ``Quarks'' and the Physics of ConfinementNov 04 1995The quark-antiquark potential and the chromoelectric fields generated by ``quarks'' in the adjoint representation of SU(2) color are analyzed in the scaling region of the theory. New results with interesting implications for our understanding of the confinement ... More
Improvement, dynamical fermions, and heavy quark screening in QCD_3Sep 29 1998First results from simulations of improved actions for both gauge fields and staggered fermion fields in three dimensional QCD are presented. This work provides insight into some issues of relevance to lattice theories in four dimensions. In particular, ... More
KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V=8 Subgiant HD 93396Jul 06 2016We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright ($V=8.0$) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with $T_{\rm eff} = 5370\pm51$ K, $M_{*} = 1.438_{-0.052}^{+0.061} ... More
Massive-Star Mergers and the Recent Transient in NGC4490: A More Massive Cousin of V838 Mon and V1309 ScoFeb 16 2016The Galactic transient V1309 Sco was the result of a merger in a low-mass star system, while V838 Mon was thought to be a similar merger event from a more massive B-type progenitor. In this paper we study an optical/IR transient discovered in the nearby ... More
Detection of warm water vapour in Taurus protoplanetary discs by HerschelDec 20 2011Dec 23 2011Line spectra of 68 Taurus T Tauri stars were obtained with the Herschel-PACS (Photodetector Array Camera & Spectrometer) instrument as part of the GASPS (Gas Evolution in Protoplanetary Systems) survey of protoplanetary discs. A careful examination of ... More
The First Naked-Eye Superflare Detected from Proxima CentauriApr 05 2018Jun 08 2018Proxima b is a terrestrial-mass planet in the habitable-zone of Proxima Centauri. Proxima Centauri's high stellar activity however casts doubt on the habitability of Proxima b: sufficiently bright and frequent flares and any associated proton events may ... More
Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant PlanetsDec 10 2013Mar 13 2014In this paper we search for distant massive companions to known transiting gas giant planets that may have influenced the dynamical evolution of these systems. We present new radial velocity observations for a sample of 51 planets obtained using the Keck ... More
Neural-Symbolic Learning and Reasoning: A Survey and InterpretationNov 10 2017The study and understanding of human behaviour is relevant to computer science, artificial intelligence, neural computation, cognitive science, philosophy, psychology, and several other areas. Presupposing cognition as basis of behaviour, among the most ... More
Comparative study of the phonons in non-superconducting BaC6 and superconducting CaC6 using inelastic x-ray scatteringFeb 23 2011May 12 2011The low energy phonons of two different graphite intercalation compounds (GICs) have been measured as a function of temperature using inelastic x-ray scattering (IXS). In the case of the non-superconductor BaC6, the phonons observed are significantly ... More
Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migrationJun 22 2016Stellar companions can influence the formation and evolution of planetary systems, but there are currently few observational constraints on the properties of planet-hosting binary star systems. We search for stellar companions around 77 transiting hot ... More
Evidence accumulation in a Laplace domain decision spaceJun 11 2018Oct 23 2018Evidence accumulation models of simple decision-making have long assumed that the brain estimates a scalar decision variable corresponding to the log-likelihood ratio of the two alternatives. Typical neural implementations of this algorithmic cognitive ... More
Complete spelling rules for the Monster tower over three-spaceDec 01 2015Aug 13 2016The Monster tower, also known as the Semple tower, is a sequence of manifolds with distributions of interest to both differential and algebraic geometers. Each manifold is a projective bundle over the previous. Moreover, each level is a fiber compactified ... More
Weighted SAMGSR: combining significance analysis of microarray-gene set reduction algorithm with pathway topology-based weights to select relevant genesMay 12 2016Introduction It has been demonstrated that a pathway-based feature selection method which incorporates biological information within pathways into the process of feature selection usually outperform a gene-based feature selection algorithm in terms of ... More
Sharp pointwise bounds for perturbed viscous shock wavesAug 31 2005Refining previous work in \cite{Z.3, MaZ.3, Ra, HZ, HR}, we derive sharp pointwise bounds on behavior of perturbed viscous shock profiles for large-amplitude Lax or overcompressive type shocks and physical viscosity. These extend well-known results of ... More
The Impact of Two-Loop Effects on the Scenario of MSSM Higgs Alignment without DecouplingAug 15 2017In multi-Higgs models, the properties of one neutral scalar state approximate those of the Standard Model (SM) Higgs boson in a limit where the corresponding scalar field is roughly aligned in field space with the scalar doublet vacuum expectation value. ... More
Spectroscopic confirmation of UV-bright white dwarfs from the Sandage Two-Color Survey of the Galactic PlaneFeb 03 2011We present spectroscopic observations confirming the identification of hot white dwarfs among UV-bright sources from the Sandage Two-color Survey of the Galactic plane and listed in the Lanning (Lan) catalog of such sources. A subsample of 213 UV bright ... More
Optimality for totally real immersions and independent mappings of manifolds into C^NMar 30 2012The optimal target dimensions are determined for totally real immersions and for independent mappings into complex affine spaces. Our arguments are similar to those given by Forster, but we use orientable manifolds as far as possible and so are able to ... More
Collider, direct and indirect detection of supersymmetric dark matterMar 03 2009We present an overview of supersymmetry searches, both at collider experiments and via searches for dark matter (DM). We focus on three DM possibilities in the SUSY context: the thermally produced neutralino, a mixture of axion and axino, and the gravitino, ... More
Exact Fourier expansion in cylindrical coordinates for the three-dimensional Helmholtz Green functionOct 07 2009A new method is presented for Fourier decomposition of the Helmholtz Green Function in cylindrical coordinates, which is equivalent to obtaining the solution of the Helmholtz equation for a general ring source. The Fourier coefficients of the Helmholtz ... More
Composites and Categories of Euclidean Jordan AlgebrasJun 30 2016We consider possible non-signaling composites of probabilistic models based on euclidean Jordan algebras (EJAs), satisfying some reasonable additional constraints motivated by the desire to construct dagger-compact categories of such models. We show that ... More
Bridges Between Subriemannian Geometry and Algebraic GeometrySep 08 2014We consider how the problem of determining normal forms for a specific class of nonholonomic systems leads to various interesting and concrete bridges between two apparently unrelated themes. Various ideas that traditionally pertain to the field of algebraic ... More