Results for "Thomas F. Miller III"

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Isomorphic classical molecular dynamics model for an excess electron in a supercritical fluidSep 26 2008Ring polymer molecular dynamics (RPMD) is used to directly simulate the dynamics of an excess electron in a supercritical fluid over a broad range of densities. The accuracy of the RPMD model is tested against numerically exact path integral statistics ... More
Exact quantum statistics for electronically nonadiabatic systems using continuous path variablesJul 27 2011We derive an exact, continuous-variable path integral (PI) representation of the canonical partition function for electronically nonadiabatic systems. Utilizing the Stock-Thoss (ST) mapping for an N-level system, matrix elements of the Boltzmann operator ... More
Flux-correlation approach to characterizing reaction pathways in quantum systems: A study of condensed-phase proton-coupled electron transferApr 16 2012We introduce a simple method for characterizing reactive pathways in quantum systems. Flux auto- correlation and cross-correlation functions are employed to develop a quantitative measure of dynamical coupling in quantum transition events, such as reactive ... More
Sampling diffusive transition pathsOct 21 2006Feb 17 2007We address the problem of sampling double-ended diffusive paths. The ensemble of paths is expressed using a symmetric version of the Onsager-Machlup formula, which only requires evaluation of the force field and which, upon direct time discretization, ... More
Solvent coarse-graining and the string method applied to the hydrophobic collapse of a hydrated chainFeb 17 2007Using computer simulations of over 100,000 atoms, the mechanism for the hydrophobic collapse of an idealized hydrated chain is obtained. This is done by coarse-graining the atomistic water molecule positions over 129,000 collective variables that represent ... More
Direct simulation of electron transfer using ring polymer molecular dynamics: Comparison with semiclassical instanton theory and exact quantum methodsJul 25 2011The use of ring polymer molecular dynamics (RPMD) for the direct simulation of electron transfer (ET) reaction dynamics is analyzed in the context of Marcus theory, semiclassical instanton theory, and exact quantum dynamics approaches. For both fully ... More
A Universal Density Matrix Functional from Molecular Orbital-Based Machine Learning: Transferability across Organic MoleculesJan 10 2019We address the degree to which machine learning can be used to accurately and transferably predict post-Hartree-Fock correlation energies. After presenting refined strategies for feature design and selection, the molecular-orbital-based machine learning ... More
Kinetically Constrained Ring-Polymer Molecular Dynamics for Non-adiabatic Chemical ReactionsJan 13 2014We extend ring-polymer molecular dynamics (RPMD) to allow for the direct simulation of general, electronically non-adiabatic chemical processes. The kinetically constrained (KC) RPMD method uses the imaginary-time path-integral representation in the set ... More
Embedded density functional theory for covalently bonded and strongly interacting subsystemsFeb 19 2011Embedded density functional theory (e-DFT) is used to describe the electronic structure of strongly interacting molecular subsystems. We present a general implementation of the Exact Embedding (EE) method [J. Chem. Phys. 133, 084103 (2010)] to calculate ... More
Enhancing Cation Diffusion and Suppressing Anion Diffusion via Lewis-Acidic Polymer ElectrolytesOct 20 2016Solid polymer electrolytes (SPE) have the potential to increase both the energy density and stability of lithium-based batteries, but low Li-ion conductivity remains a barrier to technological viability. SPEs are designed to maximize Li-ion diffusivity ... More
A Universal Density Matrix Functional from Molecular Orbital-Based Machine Learning: Transferability across Organic MoleculesJan 10 2019Feb 26 2019We address the degree to which machine learning can be used to accurately and transferably predict post-Hartree-Fock correlation energies. Refined strategies for feature design and selection are presented, and the molecular-orbital-based machine learning ... More
Analytical Gradients for Projection-Based Wavefunction-in-DFT EmbeddingMar 14 2019Projection-based embedding provides a simple, robust, and accurate approach for describing a small part of a chemical system at the level of a correlated wavefunction method while the remainder of the system is described at the level of density functional ... More
Density functional theory embedding for correlated wavefunctions: Improved methods for open-shell systems and transition metal complexesNov 26 2012Dec 17 2012Density functional theory (DFT) embedding provides a formally exact framework for interfacing correlated wave-function theory (WFT) methods with lower-level descriptions of electronic structure. Here, we report techniques to improve the accuracy and stability ... More
Structure and finiteness properties of subdirect products of groupsAug 31 2007We investigate the structure of subdirect products of groups, particularly their finiteness properties. We pay special attention to the subdirect products of free groups, surface groups and HNN extensions. We prove that a finitely presented subdirect ... More
Decomposability of Finitely Generated Torsion-free Nilpotent GroupsOct 19 2015Dec 17 2015We describe an algorithm for deciding whether or not a given finitely generated torsion-free nilpotent group is decomposable as the direct product of nontrivial subgroups.
Subgroups of direct products of limit groupsApr 30 2007Nov 06 2007If $G_1,...,G_n$ are limit groups and $S\subset G_1\times...\times G_n$ is of type $\FP_n(\mathbb Q)$ then $S$ contains a subgroup of finite index that is itself a direct product of at most $n$ limit groups. This settles a question of Sela.
Finitely presented residually free groupsSep 22 2008We establish a general criterion for the finite presentability of subdirect products of groups and use this to characterize finitely presented residually free groups. We prove that, for all $n\in\mathbb{N}$, a residually free group is of type ${\rm{FP}}_n$ ... More
On the finite presentation of subdirect products and the nature of residually free groupsMay 28 2012We establish {\em{virtual surjection to pairs}} (VSP) as a general criterion for the finite presentability of subdirect products of groups: if $\Gamma_1,...,\Gamma_n$ are finitely presented and $S<\Gamma_1\times...\times\Gamma_n$ projects to a subgroup ... More
The Cepheid Distance Scale: recent progress in fundamental techniquesAug 26 2009This review examines progress on the Pop I, fundamental-mode Cepheid distance scale with emphasis on recent developments in geometric and quasi-geometric techniques for Cepheid distance determination. Specifically I examine the surface brightness method, ... More
Jigsaw model of the origin of lifeAug 15 2001It is suggested that life originated in a three-step process referred to as the jigsaw model. RNA, proteins, or similar organic molecules polymerized in a dehydrated carbon-rich environment, on surfaces in a carbon-rich environment, or in another environment ... More
Decompositions of commutative monoid congruences and binomial idealsJul 23 2011Jun 19 2014Primary decomposition of commutative monoid congruences is insensitive to certain features of primary decomposition in commutative rings. These features are captured by the more refined theory of mesoprimary decomposition of congruences, introduced here ... More
Inelastic WIMP-nucleus scattering to the first excited state in $^{125}$TeJan 25 2016Jan 27 2016The direct detection of dark matter constituents, in particular the weakly interacting massive particles (WIMPs), is considered central to particle physics and cosmology. In this paper we study transitions to the excited states, possible in some nuclei, ... More
Intrinsic brightness of SDSS objects is similar at all redshifts in de Sitter spaceDec 21 2010The redshift-luminosity distributions for well-defined galaxies and quasars in the Sloan Digital Sky Survey (SDSS) are compared for the two redshift-distance relations of a Hubble redshift and a de Sitter redshift. Assuming a Hubble redshift, SDSS data ... More
Radio Properties of the BAT AGN: the FIR-Radio Relation, the Fundamental Plane, and the Main Sequence of Star FormationOct 04 2016We have conducted 22 GHz 1" JVLA imaging of 70 radio-quiet AGN from the Swift-BAT survey. We find radio cores in all but three objects. The radio morphologies of the sample fall into three groups: compact and core-dominated, extended, and jet-like. We ... More
Assessing Functional Neural Connectivity as an Indicator of Cognitive PerformanceJul 29 2016Studies in recent years have demonstrated that neural organization and structure impact an individual's ability to perform a given task. Specifically, individuals with greater neural efficiency have been shown to outperform those with less organized functional ... More
Billiards on GraphsOct 31 2013Dec 10 2013We prove some partial results on the periodicity of billiard systems on graphs. The results specialize to the case of $n$ billiards with equal mass on the unit interval or circle traveling at the same speed.
Rational Solutions of the Painlevé-III Equation: Large Parameter AsymptoticsAug 04 2018The Painlev\'e-III equation with parameters $\Theta_0=n+m$ and $\Theta_\infty=m-n+1$ has a unique rational solution $u(x)=u_n(x;m)$ with $u_n(\infty;m)=1$ whenever $n\in\mathbb{Z}$. Using a Riemann-Hilbert representation proposed in \cite{BothnerMS18}, ... More
Far-from-equilibrium dynamics of a strongly coupled non-Abelian plasma with non-zero charge density or external magnetic fieldMar 24 2015Sep 23 2015Using holography, we study the evolution of a spatially homogeneous, far from equilibrium, strongly coupled N=4 supersymmetric Yang-Mills plasma with a non-zero charge density or a background magnetic field. This gauge theory problem corresponds, in the ... More
Surface Sputtering from Cold Dark Matter Interactions: Proposed Search for its Diurnal ModulationMay 12 1995Nuclear recoil cascades induced by Cold Dark Matter (CDM) elastic scattering can produce the ejection of target atoms from solid surfaces. We calculate the yield and energy distribution of these sputtered atoms in a variety of materials. These parameters ... More
Current commutator anomalies in finite-element quantum electrodynamicsDec 20 1993Four-dimensional quantum electrodynamics has been formulated on a hypercubic Minkowski finite-element lattice. The equations of motion have been derived so as to preserve lattice gauge invariance and have been shown to be unitary. In addition, species ... More
Nuclear Tracks from Cold Dark Matter Interactions in Mineral Crystals: A Computational StudyMay 11 1995May 12 1995Recoiling nuclei from Cold Dark Matter (CDM) elastic scattering interactions with the constituent elements of some minerals may produce etchable damage tracks in the crystal structure. Present calculations show that in muscovite mica, CDM tracks from ... More
Energy Loss Calculations of Moving Defects for General Holographic MetricsDec 12 2011We extend the ideas of using AdS/CFT to calculate energy loss of extended defects in strongly coupled systems to general holographic metrics. We find the equations of motion governing uniformly moving defects of various dimension and determine the corresponding ... More
A Closely-Packed System of Low-Mass, Low-Density Planets Transiting Kepler-11Feb 01 2011When an extrasolar planet passes in front of its star (transits), its radius can be measured from the decrease in starlight and its orbital period from the time between transits. Multiple planets transiting the same star reveal more: period ratios determine ... More
User-friendly, theory-based web applet for rapidly predicting structure and thermodynamics of complex fluidsJul 29 2014Based on a recently introduced analytical strategy [Hollingshead et al., J. Chem. Phys. 139, 161102 (2013)], we present a web applet that can quickly and semi-quantitatively estimate the equilibrium radial distribution function and related thermodynamic ... More
Damping of hard excitations in strongly coupled $\mathcal N\,{=}\,4$ plasmaOct 11 2016The damping of high momentum excitations in strongly coupled maximally supersymmetric Yang-Mills plasma is studied. Previous calculations of the asymptotic behavior of the quasinormal mode spectrum are extended and clarified. We confirm that subleading ... More
Spinor fields in general Newton-Cartan backgroundsOct 13 2015We give a covariant construction of Lagrangians for spinor fields in generic Newton-Cartan backgrounds. A non-relativistic Dirac/Levy-Leblond operator and the associated fields are obtained from relativistic analogues by a limiting procedure. The relativistic ... More
Rational Solutions of the Painlevé-III EquationJan 13 2018All of the six Painlev\'e equations except the first have families of rational solutions, which are frequently important in applications. The third Painlev\'e equation in generic form depends on two parameters $m$ and $n$, and it has rational solutions ... More
Bondi Accretion in Trumpet GeometriesJul 11 2016The Bondi solution, which describes the radial inflow of a gas onto a non-rotating black hole, provides a powerful test for numerical relativistic codes. However, the Bondi solution is usually derived in Schwarzschild coordinates, which are not well suited ... More
Precise Determination of Electroweak Parameters in Neutrino-Nucleon ScatteringApr 06 2002Jul 09 2004A systematic error in the extraction of $\sin^2 \theta_W$ from nuclear deep inelastic scattering of neutrinos and antineutrinos arises from higher-twist effects arising from nuclear shadowing. We explain that these effects cause a correction to the results ... More
Electromagnetic Gauge Invariance of the Cloudy Bag ModelJul 11 1997We examine the question of the gauge invariance of electromagnetic form factors calculated within the cloudy bag model. One of the assumptions of the model is that electromagnetic form factors are most accurately evaluated in the Breit frame. This feature ... More
Irreducible decomposition of binomial idealsMar 09 2015Apr 05 2016Building on coprincipal mesoprimary decomposition [Kahle and Miller, 2014], we combinatorially construct an irreducible decomposition of any given binomial ideal. In a parallel manner, for congruences in commutative monoids we construct decompositions ... More
Rho-Omega Mixing Off Shell and Charge Symmetry Breaking In the N-N PotentialJun 26 1995The role of the off-shell dependence of $\rho-\omega$ mixing in the charge symmetry breaking nucleon-nucleon potential is discussed. It is shown that models describing the off-shell dependence of $\rho-\omega$ mixing are not sufficient to determine the ... More
Fully quantum mechanical dynamic analysis of single-photon transport in a single-mode waveguide coupled to a traveling-wave resonatorOct 08 2010Oct 12 2010We analyze the dynamics of single photon transport in a single-mode waveguide coupled to a micro-optical resonator using a fully quantum mechanical model. We examine the propagation of a single-photon Gaussian packet through the system under various coupling ... More
Coherent Neutral Current Neutrino-Nucleus Scattering at a Spallation Source; a Valuable Experimental ProbeFeb 06 2009The coherent contribution of all neutrons in neutrino nucleus scattering due to the neutral current is examined considering the Spallation Neutron Source (SNS) as a source of neutrinos. SNS is a prolific pulsed source of electron and muon neutrinos as ... More
The experimental challenge of detecting solar axion-like particles to test cosmological ALP-photon oscillation hypothesisFeb 13 2010Oct 04 2010We consider possible experimental tests of recent hypotheses suggesting that TeV photons survive the pair production interaction with extragalactic background light over cosmological distances by converting to axion-like particles (ALPs) in galactic magnetic ... More
An Iterative Approach to Twisting and Diverging, Type N, Vacuum Einstein Equations: A (Third-Order) Resolution of Stephani's `Paradox'May 24 1996In 1993, a proof was published, within ``Classical and Quantum Gravity,'' that there are no regular solutions to the {\it linearized} version of the twisting, type-N, vacuum solutions of the Einstein field equations. While this proof is certainly correct, ... More
Kepler 18-b, c, and d: A System Of Three Planets Confirmed by Transit Timing Variations, Lightcurve Validation, Spitzer Photometry and Radial Velocity MeasurementsOct 04 2011We report the detection of three transiting planets around a Sunlike star, which we designate Kepler-18. The transit signals were detected in photometric data from the Kepler satellite, and were confirmed to arise from planets using a combination of large ... More
Planetary Candidates Observed by Kepler VI: Planet Sample from Q1-Q16 (47 Months)Feb 06 2015\We present the sixth catalog of Kepler candidate planets based on nearly 4 years of high precision photometry. This catalog builds on the legacy of previous catalogs released by the Kepler project and includes 1493 new Kepler Objects of Interest (KOIs) ... More
Additional Comments on "New Limits on Spin-Independent Couplings of Low-Mass WIMP Dark Matter with a Germanium Detector at a Threshold of 200 eV"Jun 08 2008Aug 09 2008In a previous comment (arXiv:0806.1341v1) we criticized purely technical aspects of arXiv:0712.1645 but pointed out that many other inconsistencies were readily apparent. In view of the imminent posting of another version of arXiv:0712.1645, still containing ... More
Dwarf Spheroidal Galaxies : Keystones of Galaxy EvolutionNov 16 1994Dwarf spheroidal galaxies are the most insignificant extragalactic stellar systems in terms of their visibility, but potentially very significant in terms of their role in the formation and evolution of much more luminous galaxies. We discuss the present ... More
The MAJORANA 76Ge neutrino less double-beta decay project: A brief updateNov 29 2007At present, MAJORANA is a research and development (R&D) project to investigate the feasibility and cost of constructing and operating a one ton decay experiment with ~1000 kg of Ge detectors fabricated from germanium enriched to 86% in . The study will ... More
Axion Detection via Atomic ExcitationsJan 06 2018Jan 17 2018The possibility of axion detection by observing axion induced atomic excitations as recently suggested by Sikivie is discussed. The atom is cooled at low temperature and it is chosen to posses three levels. The first is the ground state, the second is ... More
Twin LIGO/Virgo Detections of a Viable Gravitationally-Lensed Black Hole MergerJan 10 2019We identify a binary black hole (BBH) merger that appears to be multiply lensed by an intervening galaxy. The LIGO/Virgo events GW170809 and GW170814 have indistinguishable waveforms separated by 5 days, and overlap on the sky within the 90\% credible ... More
Density Gradient and Absorption Effects in Gas-Filled Magnetic Axion HelioscopesMay 14 2008The effects of absorption in the gas, and of density variations on the sensitivity of gas-filled solar-axion helioscopes are theoretically investigated. It is concluded that the 10-meter long CAST helioscope, the most sensitive experiment to date is near ... More
Can large scintillators be used for solar-axion searches to test the cosmological axion-photon oscillation proposal?Mar 25 2009Jul 19 2009Solar-axion interaction rates in NaI, CsI and Xe scintillators via the axio-electric effect were calculated. A table is presented with photoelectric and axioelectric cross sections, solar-axion fluxes, and the interaction rates from 2.0 to 10.0 keV. The ... More
An Exploration of Physiological Responses to the Native American FluteJan 22 2014Jan 24 2014This pilot study explored physiological responses to playing and listening to the Native American flute. Autonomic, electroencephalographic (EEG), and heart rate variability (HRV) metrics were recorded while participants (N = 15) played flutes and listened ... More
The distance from a point to its opposite along the surface of a boxFeb 03 2015Given a point (the "spider") on a rectangular box, we would like to find the minimal distance along the surface to its opposite point (the "fly" - the reflection of the spider across the center of the box). Without loss of generality, we can assume that ... More
Dynamic Metrics of Heart Rate VariabilityAug 27 2013Aug 29 2013Numerous metrics of heart rate variability (HRV) have been described, analyzed, and compared in the literature. However, they rarely cover the actual metrics used in a class of HRV data acquisition devices - those designed primarily to produce real-time ... More
The vanishing limit of the square-well fluid: the adhesive hard sphere model as a reference systemDec 18 2007We report a simulation study of the gas-liquid critical point for the square-well potential, for values of well width delta as small as 0.005 times the particle diameter sigma. For small delta, the reduced second virial coefficient at the critical point ... More
Spitzer-MIPS Observations of the eta Cha Young AssociationApr 18 2008We have mapped the eta Chamaeleontis young stellar association in the far-infrared with the Multiband Imaging Photometer for Spitzer (MIPS) on the Spitzer Space Telescope. All sixteen members within the map region were detected at 24 um, along with five ... More
Current-phase Relationship, Thermal and Quantum Phase Slips in Superconducting Nanowires made on Scaffold Created using Adhesive TapeMay 11 2009Quantum phase slippage (QPS) in a superconducting nanowire is a new candidate for developing a quantum bit. It has also been theoretically predicted that the occurrence of QPS significantly changes the current-phase relationship (CPR) of the wire due ... More
Infrared Surface Brightness Distances to CepheidsSep 21 2005Bayesian statistical calculations and linear-bisector calculations for obtaining Cepheid distances and radii by the infrared surface brightness method have been compared for a set of 38 Cepheids. The distances obtained by the two techniques agree to 1.5%+/-0.6% ... More
Infrared Surface Brightness Distances to Cepheids: a comparison of Bayesian and linear-bisector calculationsJun 03 2005We have compared the results of Bayesian statistical calculations and linear-bisector calculations for obtaining Cepheid distances and radii by the infrared surface brightness method. We analyzed a set of 38 Cepheids using a Bayesian Markov Chain Monte ... More
Measured redshift invariance of photon velocityDec 04 2010We report the first direct photon velocity measurements for extragalactic objects. A fiber-optic, photon time-of-flight instrument, optimized for relatively dim sources ($m 12$), is used to measure the velocity of visible photons emanating from galaxies ... More
The near-IR Surface Brightness Method applied to six Cepheids in the young LMC cluster NGC1866Jun 06 2005We present new near-IR light curves for six Cepheids in the young blue LMC cluster NGC1866 as well as high precision radial velocity curves for ten Cepheids in NGC1866 and two in NGC2031. For the six Cepheids in NGC1866 with new J and K light curves we ... More
Evidence for a Universal Slope of the Period-Luminosity Relation from Direct Distances to Cepheids in the LMCSep 22 2005We have applied the infrared surface brightness (ISB) technique to derive distances to 13 Cepheid variables in the LMC which have periods from 3-42 days. The corresponding absolute magnitudes define PL relations in VIWJK bands which agree exceedingly ... More
A New Approach to Background Subtraction in Low-Energy Neutrino ExperimentsFeb 18 2000We discuss a new method to extract neutrino signals in low energy experiments. In this scheme the symmetric nature of most backgrounds allows for direct cancellation from data. The application of this technique to the Palo Verde reactor neutrino oscillation ... More
The shifted Wald distribution represents a non-censored Wiener diffusion model of choice response times: Evidence from simulations and a Go/No-go taskJul 14 2015Cognitive psychologists commonly strive to infer processes/constructs from chronometric data. In this regard, diffusion modeling of response times (RTs) from correct and erroneous responses using the Wiener distribution has become popular because it provides ... More
The Phylogenetic Indian Buffet Process: A Non-Exchangeable Nonparametric Prior for Latent FeaturesJun 13 2012Nonparametric Bayesian models are often based on the assumption that the objects being modeled are exchangeable. While appropriate in some applications (e.g., bag-of-words models for documents), exchangeability is sometimes assumed simply for computational ... More
Important New Developments in Arabographic Optical Character Recognition (OCR)Mar 28 2017The OpenITI team has achieved Optical Character Recognition (OCR) accuracy rates for classical Arabic-script texts in the high nineties. These numbers are based on our tests of seven different Arabic-script texts of varying quality and typefaces, totaling ... More
Linear and quadratic ranges in representation stabilityJun 12 2017May 07 2018We prove two general results concerning spectral sequences of $\mathbf{FI}$-modules. These results can be used to significantly improve stable ranges in a large portion of the stability theorems for $\mathbf{FI}$-modules currently in the literature. We ... More
Comparison of Nucleon Form Factors from Lattice QCD Against the Light Front Cloudy Bag Model and Extrapolation to the Physical Mass RegimeJan 18 2005May 25 2005We explore the possibility of extrapolating state of the art lattice QCD calculations of nucleon form factors to the physical regime. We find that the lattice results can be reproduced using the Light Front Cloudy Bag Model by letting its parameters be ... More
Fibers of maps to totally nonnegative spacesMar 04 2019This paper undertakes a study of the structure of the fibers of a family of maps $f_{(i_1,\dots ,i_d)}$ arising from representation theory, motivated both by connections to Lusztig's theory of canonical bases and also by the fact that these fibers encode ... More
Nuclear Quasi-Elastic Electron Scattering Limits Nucleon Off-Mass Shell PropertiesJul 03 2012Oct 02 2012The use of quasi-elastic electron nucleus scattering is shown to provide significant constraints on models of the proton electromagnetic form factor of off-shell nucleons. Such models can be constructed to be consistent with constraints from current conservation ... More
Study of Lattice QCD Form Factors Using the Extended Gari-Krumpelmann ModelAug 24 2005We explore the suitability of a modern vector meson dominance (VMD) model as a method for chiral extrapolation of nucleon electromagnetic form factor simulations in lattice QCD. It is found that the VMD fits to experimental data can be readily generalized ... More
A Wind Accretion Model for HLX-1Feb 20 2014The brightest ultraluminous X-ray source currently known, HLX-1, has been observed to undergo five outburst cycles. The periodicity of these outbursts, and their high inferred maximum accretion rates of $\sim{\rm few}\times 10^{-4} M_\odot {\rm yr}^{-1}$, ... More
Transit Timing Observations from Kepler: VI. Transit Timing Variation Candidates in the First Seventeen Months from Polynomial ModelsJan 09 2012Jul 14 2012Transit timing variations provide a powerful tool for confirming and characterizing transiting planets, as well as detecting non-transiting planets. We report the results an updated TTV analysis for 1481 planet candidates (Borucki et al. 2011; Batalha ... More
The Primordial Inflation Polarization Explorer (PIPER)Jul 21 2016The Primordial Inflation Polarization ExploreR (PIPER) is a balloon-borne telescope designed to measure the polarization of the Cosmic Microwave Background on large angular scales. PIPER will map 85% of the sky at 200, 270, 350, and 600 GHz over a series ... More
The MAJORANA DEMONSTRATOR: A Search for Neutrinoless Double-beta Decay of Germanium-76Sep 07 2011The observation of neutrinoless double-beta decay would determine whether the neutrino is a Majorana particle and provide information on the absolute scale of neutrino mass. The MAJORANA Collaboration is constructing the DEMONSTRATOR, an array of germanium ... More
Depth Requirements for a Tonne-scale 76Ge Neutrinoless Double-beta Decay ExperimentSep 19 2011Apr 18 2013Neutrinoless double-beta decay experiments can potentially determine the Majorana or Dirac nature of the neutrino, and aid in understanding the neutrino absolute mass scale and hierarchy. Future 76Ge-based searches target a half-life sensitivity of >10^27 ... More
The Majorana experiment: an ultra-low background search for neutrinoless double-beta decayNov 23 2011The observation of neutrinoless double-beta decay would resolve the Majorana nature of the neutrino and could provide information on the absolute scale of the neutrino mass. The initial phase of the Majorana experiment, known as the Demonstrator, will ... More
The Majorana DemonstratorSep 30 2011A brief review of the history and neutrino physics of double beta decay is given. A description of the MAJORANA DEMONSTRATOR research and development program including background reduction techniques is presented in some detail. The application of point ... More
Kepler Observations of Transiting Hot Compact ObjectsJan 19 2010Jan 26 2010Kepler photometry has revealed two unusual transiting companions orbiting an early A-star and a late B-star. In both cases the occultation of the companion is deeper than the transit. The occultation and transit with follow-up optical spectroscopy reveal ... More
What is tested when experiments test that quantum dynamics is linearFeb 25 2010Jun 08 2010Experiments that look for nonlinear quantum dynamics test the fundamental premise of physics that one of two separate systems can influence the physical behavior of the other only if there is a force between them, an interaction that involves momentum ... More
Maps and inverse maps in open quantum dynamicsOct 24 2007Jul 08 2008Two kinds of maps that describe evolution of states of a subsystem coming from dynamics described by a unitary operator for a larger system, maps defined for fixed mean values and maps defined for fixed correlations, are found to be quite different for ... More
Modified Newtonian dynamics from acceleration fluctuationsFeb 16 2004A speculative mathematical model is used to generate the modified Newtonian dynamics called MOND from fluctuations of the number of quanta of quantized acceleration. The one new parameter can be chosen either to make the transition to modification comparable ... More
A quantitative improvement for Roth's theorem on arithmetic progressionsMay 22 2014Jun 18 2014We improve the quantitative estimate for Roth's theorem on three-term arithmetic progressions, showing that if $A\subset\{1,\ldots,N\}$ contains no non-trivial three-term arithmetic progressions then $\lvert A\rvert\ll N(\log\log N)^4/\log N$. By the ... More
Symmetries in open quantum dynamicsAug 16 2014Nov 10 2016Simple examples are used to introduce and examine symmetries of open quantum dynamics that can be described by unitary operators. For the Hamiltonian dynamics of an entire closed system, the symmetry takes the expected form which, when the Hamiltonian ... More
Planet Four: Terrains - Discovery of Araneiforms Outside of the South Polar Layered DepositsAug 25 2017We present the results of a systematic mapping of seasonally sculpted terrains on the South Polar region of Mars with the Planet Four: Terrains (P4T) online citizen science project. P4T enlists members of the general public to visually identify features ... More
Why quantum dynamics is linearFeb 16 2007Quantum dynamics is linear. How do we know? From theory or experiment? The history of this question is reviewed. Nonlinear generalizations of quantum mechanics have been proposed. They predict small but clear nonlinear effects, which very accurate experiments ... More
A Mathematical Approach to Comply with Ethical Constraints in Compassionate Use TreatmentsApr 09 2018Patients who are seriously ill may ask doctors to treat them with unapproved medication, about which not much is known, or else with known medication in a high dosage. Apart from strict legal constraints such cases may involve difficult ethical questions ... More
Theoretical Estimate of the Sensitivity of the CUORE Detector to Solar AxionsJul 02 2015Sep 30 2015In this paper we calculate the potential sensitivity of the CUORE detector to axions produced in the Sun through the Primakoff process and detected by the inverse coherent Bragg-Primakoff process. The conversion rate is calculated using density functional ... More
H2O- and OH-bearing minerals in the Martian regolith: Analysis of 1997 observations from HST/NICMOSDec 03 2002We have analyzed observations of the Acidalia hemisphere of Mars taken by the Hubble Space Telescope's Near-Infrared Camera Multi-Object Spectrograph (HST/NICMOS) during July of 1997 (Ls = 152 degrees, northern Martian summer). The data consist of images ... More
Affine maps of density matricesJul 26 2004Nov 21 2004For quantum systems described by finite matrices, linear and affine maps of matrices are shown to provide equivalent descriptions of evolution of density matrices for a subsystem caused by unitary Hamiltonian evolution in a larger system; an affine map ... More
Steppingstones in Hamiltonian dynamicsOct 28 2003Dec 09 2003Easy steps through essential Hamiltonian dynamics are outlined, from necessary definitions of Poisson brackets and canonical transformations, to a quick proof that Hamiltonian evolution is made by canonical transformations, the quickest proof of Liouville's ... More
Cosmology calculations almost without general relativitySep 28 2003Dec 08 2004The Friedmann equation is derived for a Newtonian universe. Changing mass density to energy density gives exactly the Friedmann equation of general relativity. Accounting for work done by pressure then yields the two Einstein equations that govern the ... More
Bracket relations for relativity groupsOct 25 2008Mar 20 2016Poisson bracket relations for generators of canonical transformations are derived directly from the Galilei and Poincar\'e groups of changes of space-time coordinates. The method is simple but rigorous. The meaning of each step is clear because it corresponds ... More
Assumptions that imply quantum dynamics is linearAug 11 2005Jan 26 2006A basic linearity of quantum dynamics, that density matrices are mapped linearly to density matrices, is proved very simply for a system that does not interact with anything else. It is assumed that at each time the physical quantities and states are ... More
Spatially resolved kinematics of the multi-phase interstellar medium in the inner disk of M82Oct 04 2012We present spatially resolved kinematics of the interstellar NaI D 5890,5896 doublet absorption and 12CO(1-0) emission across the inner ~2x1 kpc of the disk of M82. These data were obtained with the DensePak IFU on the WIYN telescope and the Caltech Owens ... More
A polarization identity for multilinear mapsSep 05 2013Dec 23 2013Given linear spaces $E$ and $F$ over the real numbers or a field of characteristic zero, a simple argument is given to represent a symmetric multilinear map $u(x_1, x_2, \ldots, x_n)$ from $E^n$ to $F$ in terms of its restriction to the diagonal. As an ... More