Results for "Carina M. Persson"

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In situ analysis of catalyst composition during gold catalyzed GaAs nanowire growthFeb 21 2019Mar 21 2019Semiconductor nanowires offer the opportunity to incorporate novel structures and functionality into electronic and optoelectronic devices. A clear understanding of the nanowire growth mechanism is essential for well-controlled growth of structures with ... More
Herschel-HIFI observations of H2O, NH3 and N2H+ toward high-mass starless and proto-stellar clumps identified by the Hi-GAL surveyAug 26 2015Our present understanding of high-mass star formation still remains very schematic. In particular, it is not yet clear how much of the difference between low-mass and high-mass star formation occurs during the earliest star formation phases. The chemical ... More
K2-60b and epic 216468514b. A sub-jovian and a jovian planet from the k2 missionNov 11 2016We report the characterization and independant detection of K2-60b, as well as the detection and characterization of EPIC 216468514b, two transiting hot gaseous planets from the K2 space mission. We confirm the planetary nature of the two systems and ... More
K2-264: A transiting multi-planet system in the Praesepe open clusterSep 06 2018Feb 14 2019Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable ... More
K2-155: A Bright Metal-Poor M Dwarf with Three Transiting Super-EarthsJan 22 2018Jan 24 2018We report on the discovery of three transiting super-Earths around K2-155 (EPIC 210897587), a relatively bright early M dwarf ($V=12.81$ mag) observed during Campaign 13 of the NASA K2 mission. To characterize the system and validate the planet candidates, ... More
44 Validated Planets from K2 Campaign 10Jun 29 2018We present 44 validated planets from the 10$^\mathrm{th}$ observing campaign of the NASA $K2$ mission, as well as high resolution spectroscopy and speckle imaging follow-up observations. These 44 planets come from an initial set of 72 vetted candidates, ... More
EPIC 210894022b - A short period super-Earth transiting a metal poor, evolved old starApr 26 2017The star EPIC 210894022 has been identified from a light curve acquired through the K2 space mission as possibly orbited by a transiting planet. Our aim is to confirm the planetary nature of the object and derive its fundamental parameters. We combine ... More
The transiting multi-planet system HD3167: a 5.7 MEarth Super-Earth and a 8.3 MEarth mini-NeptuneJun 08 2017HD3167 is a bright (V=8.9 mag) K0V star observed by the NASA's K2 space mission during its Campaign 8. It has been recently found to host two small transiting planets, namely, HD3167b, an ultra short period (0.96 d) super-Earth, and HD3167c, a mini-Neptune ... More
QHWM of the orthogonal and symplectic types Lie subalgebras of the Lie algebra of the matrix quantum pseudo differential operatorsMar 17 2017In this paper we classify the irreducible quasifinite highest weight modules over the orthogonal and symplectic types Lie subalgebras of the Lie algebra of the matrix quantum pseudo differential operators. We also realize them in terms of the irreducible ... More
Limit theorems and fluctuations for point vortices of generalized Euler equationsOct 30 2018We prove a mean field limit, a law of large numbers and a central limit theorem for a system of point vortices on the 2D torus at equilibrium with positive temperature. The point vortices are formal solutions of a class of equations generalising the Euler ... More
Point vortices for inviscid generalized surface quasi-geostrophic modelsDec 12 2018We give a rigorous proof of the validity of the point vortex description for a class of inviscid generalized surface quasi-geostrophic models on the whole plane.
Exoplanets around Low-mass Stars Unveiled by K2Oct 09 2017Jan 19 2018We present the detection and follow-up observations of planetary candidates around low-mass stars observed by the K2 mission. Based on light-curve analysis, adaptive-optics imaging, and optical spectroscopy at low and high resolution (including radial ... More
Mass and motion of globulettes in the Rosette NebulaMay 11 2013May 16 2013We have investigated tiny molecular clumps in the Rosette Nebula. Radio observations were made of molecular line emission from 16 globulettes identified in a previous optical survey. In addtion, we collected images in the NIR broad-band JHKs and narrow-band ... More
Theory of Inelastic Electron Tunneling from a Localized Spin in the Impulsive ApproximationNov 15 2008A simple expression for the conductance steps in the inelastic electron tunneling from spin excitations in a single magnetic atom adsorbed on a non-magnetic metal surfaces is derived. The inelastic coupling between the tunneling electron and the spin ... More
Adsorption-induced constraint on delocalization of electron states in an Au chain on NiAl(110)Feb 10 2005We have carried out a density functional study of the localized constraint on the delocalized, unoccupied resonance states in a mono atomic Au chain on a NiAl(110) surface by adsorption of a CO molecule on one of the adatoms in the chain. This constraint ... More
Chemical complexity induced by efficient ice evaporation in the Barnard 5 molecular cloudJun 05 2017Cold gas-phase water has recently been detected in a cold dark cloud, Barnard 5 located in the Perseus complex, by targeting methanol peaks as signposts for ice mantle evaporation. Observed morphology and abundances of methanol and water are consistent ... More
The discovery and mass measurement of a new ultra-short-period planet: EPIC~228732031bSep 29 2017We report the discovery of a new ultra-short-period planet and summarize the properties of all such planets for which the mass and radius have been measured. The new planet, EPIC~228732031b, was discovered in {\it K2} Campaign 10. It has a radius of 1.81$^{+0.16}_{-0.12}~R_{\oplus}$ ... More
The transiting system HD 15337: a pair of nearly equal-mass sub-Neptunes on opposite sides of the radius gapMar 13 2019Mar 14 2019We report the discovery of two small planets transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V=9) K1 V dwarf observed by the Transiting Exoplanet Survey Satellite (TESS ) in Sectors 3 and 4. We combine the TESS photometry with archival ... More
Fluctuations in a general preferential attachment model via Stein's methodMay 03 2018We consider a general preferential attachment model, where the probability that a newly arriving vertex connects to an older vertex is proportional to a sublinear function of the indegree of the older vertex at that time. It is well known that the distribution ... More
Black Hole Entropy is Thermodynamic EntropyMar 14 2019The comparison of geometrical properties of black holes with classical thermodynamic variables reveals surprising parallels between the laws of black hole mechanics and the laws of thermodynamics. Since Hawking's discovery that black holes when coupled ... More
Constraining the Nature of the Galactic Center X-ray Source PopulationSep 26 2005We searched for infrared counterparts to the cluster of X-ray point sources discovered by Chandra in the Galactic Center Region (GCR). While the sources could be white dwarfs, neutron stars, or black holes accreting from stellar companions, their X-ray ... More
Remark on magnetic Schroedinger operators in exterior domainsJul 11 2009We study the Schroedinger operator with a constant magnetic field in the exterior of a two-dimensional compact domain. Functions in the domain of the operator are subject to a boundary condition of the third type (Robin condition). In addition to the ... More
A simplified density functional theory method for charged adsorbates on an ultrathin, insulating film supported by a metal substrateOct 31 2013A simplified density functional theory (DFT) method for charged adsorbates on an ultrathin, insulating film supported by a metal substrate is developed and presented. This new method is based on a previous DFT development that uses a perfect conductor ... More
Dimension and measure of baker-like skew-products of $β$-transformationsApr 27 2010Mar 30 2011We consider a generalisation of the baker's transformation, consisting of a skew-product of contractions and a $\beta$-transformation. The Hausdorff dimension and Lebesgue measure of the attractor is calculated for a set of parameters with positive measure. ... More
Bernoulli Convolutions and 1D DynamicsJan 27 2015We describe a family $\phi_{\lambda}$ of dynamical systems on the unit interval which preserve Bernoulli convolutions. We show that if there are parameter ranges for which these systems are piecewise convex, then the corresponding Bernoulli convolution ... More
Robust motifs of threshold-linear networksFeb 27 2019Robust motifs are graphs associated to threshold-linear networks (TLNs) for which the structure of fixed points is independent of the choice of connectivity matrix $W$. In this work we describe infinite families of robust motifs, and use them to completely ... More
Tin+1Cn MXene with fully saturated and thermally stable Cl terminationsJan 16 2019MXenes are a rapidly growing family of 2D materials that exhibit a highly versatile structure and composition, allowing for significant tuning of the material properties. These properties are, however, ultimately limited by the surface terminations, which ... More
Theoretical study of electron states in Au chains on NiAl(110)May 28 2004We have carried out a density functional study of unoccupied, resonance states in a single Au atom, dimers, a trimer and infinite Au chains on the NiAl(110) surface. Two inequivalent orientations of the ad-chains with substantially different interatomic ... More
A sharp boundedness result concerning some maximal operators of Vilenkin-Fejér meansOct 21 2014In this paper we derive the maximal subspace of positive numbers, for which the restricted maximal operator of Fej\'er means in this subspace is bounded from the Hardy space $H_{p}$ to the space $L_{p}$ for all $0<p\leq 1/2.$ Moreover, we prove that the ... More
Optimal Space-Time Block Code Designs Based on Irreducible Polynomials of Degree TwoJan 18 2019The main of this paper is to prove that in terms of normalized density, a space-time block code based on an irreducible quadratic polynomial over the Eisenstein integers is an optimal space-time block code compared with any quadratic space-time block ... More
Ultra-relativistic oscillon collisionsOct 07 2014Oct 20 2014In this short note we investigate the ultra-relativistic collisions of small amplitude oscillons in 1+1 dimensions. Using the amplitude of the oscillons and the inverse relativistic boost factor $\gamma^{-1}$ as the perturbation variables, we analytically ... More
The Spectrum of Volterra-type integration operators on generalized Fock spacesSep 04 2015We describe the spectrum of certain integration operators acting on general- ized Fock spaces.
Magnetic structure of EuFe2As2 determined by single crystal neutron diffractionAug 21 2009Among various parent compounds of iron pnictide superconductors, EuFe2As2 stands out due to the presence of both spin density wave of Fe and antiferromagnetic ordering (AFM) of the localized Eu2+ moment. Single crystal neutron diffraction studies have ... More
Water deuterium fractionation in the high-mass star-forming region G34.26+0.15 based on Herschel/HIFI dataSep 03 2014Understanding water deuterium fractionation is important for constraining the mechanisms of water formation in interstellar clouds. Observations of HDO and H$_2^{18}$O transitions were carried out towards the high-mass star-forming region G34.26+0.15 ... More
Herschel observations of interstellar chloronium. II - Detections toward G29.96-0.02, W49N, W51, and W3(OH), and determinations of the ortho-to-para and $^{35}$Cl/$^{37}$Cl isotopic ratiosMay 04 2015We report additional detections of the chloronium molecular ion, H$_2$Cl$^+$, toward four bright submillimeter continuum sources: G29.96, W49N, W51, and W3(OH). With the use of the HIFI instrument on the Herschel Space Observatory, we observed the $2_{12}-1_{01}$ ... More
Reverse Cauchy--Schwarz inequalities for positive C*-valued sesquilinear formsMay 25 2009We prove two new reverse Cauchy--Schwarz inequalities of additive and multiplicative types in a space equipped with a positive sesquilinear form with values in a C*-algebra. We apply our results to get some norm and integral inequalities. As a consequence, ... More
Strong diamagnetism for the ball in three dimensionsNov 25 2009In this paper we give a detailed asymptotic formula for the lowest eigenvalue of the magnetic Neumann Schr\"odinger operator in the ball in three dimensions with constant magnetic field, as the strength of the magnetic field tends to infinity. This asymptotic ... More
On the essential spectrum of magnetic Schroedinger operators in exterior domainsSep 03 2011We establish equality between the essential spectrum of the Schroedinger operator with magnetic field in the exterior of a compact arbitrary dimensional domain and that of the operator defined in all the space, and discuss applications of this equality. ... More
Shrinking targets and eventually always hitting points for interval mapsMar 16 2019We study shrinking target problems and the set $\mathcal{E}_{\text{ah}}$ of eventually always hitting points. These are the points whose first $n$ iterates will never have empty intersection with the $n$-th target for sufficiently large $n$. We derive ... More
Force localization in contracting cell layersJan 13 2012Epithelial cell layers on soft elastic substrates or pillar arrays are commonly used as model systems for investigating the role of force in tissue growth, maintenance and repair. Here we show analytically that the experimentally observed localization ... More
Algebraic signatures of convex and non-convex codesJul 08 2018A convex code is a binary code generated by the pattern of intersections of a collection of open convex sets in some Euclidean space. Convex codes are relevant to neuroscience as they arise from the activity of neurons that have convex receptive fields. ... More
In situ analysis of catalyst composition during gold catalyzed GaAs nanowire growthFeb 21 2019Semiconductor nanowires offer the opportunity to incorporate new functionality and novel structures into electronic and optoelectronic devices. A clear understanding of the nanowire growth mechanism is essential for well-controlled growth of structures ... More
Site percolation on lattices with low average coordination numbersMar 07 2014We present a study of site and bond percolation on periodic lattices with (on average) fewer than three nearest neighbors per site. We have studied this issue in two contexts: By simulating oxides with a mixture of 2-coordinated and higher-coordinated ... More
Geometric Configurations, Regular Subalgebras of E10 and M-Theory CosmologyJun 14 2006Jun 29 2006We re-examine previously found cosmological solutions to eleven-dimensional supergravity in the light of the E_{10}-approach to M-theory. We focus on the solutions with non zero electric field determined by geometric configurations (n_m, g_3), n\leq 10. ... More
Mixed norm and multidimensional Lorentz spacesSep 01 2004In the last decade, the problem of characterizing the normability of the weighted Lorentz spaces has been completely solved (\cite{Sa}, \cite{CaSoA}). However, the question for multidimensional Lorentz spaces is still open. In this paper, we consider ... More
Replying "the comment on Interlayer interactions in graphites"Jul 12 2014For the moment, there is no exact description of van der Waals (vdW) interactions. ACFD-RPA \cite{Gould1} is expected to better describe vdW bonding, but it is not exact. The PBE/DFT-D2 method is less satisfactory, however, its results are in good agreement ... More
A sharp boundedness result for restricted maximal operators of Vilenkin-Fourier series on martingale Hardy spacesFeb 14 2018The restricted maximal operators of partial sums with respect to bounded Vilenkin systems are investigated. We derive the maximal subspace of positive numbers, for which this operator is bounded from the Hardy space $%H_{p}$ to the Lebesgue space $L_{p}$ ... More
On the Hausdorff Dimension of Bernoulli ConvolutionsJan 22 2018We give an expression for the Garsia entropy of Bernoulli convolutions in terms of products of matrices. This gives an explicit rate of convergence of the Garsia entropy and shows that one can calculate the Hausdorff dimension of the Bernoulli convolution ... More
Energy, phonon, and dynamic stability criteria of 2d materialsJan 22 2019Jan 28 2019First-principles calculations have become a powerful tool to exclude the Edisonian approach in search of novel 2d materials. However, no universal first-principles criteria to examine the realizability of hypothetical 2d materials have been established ... More
Birkhoff sums of infinite observables and anomalous time-scaling of extreme events in infinite systemsOct 25 2018Nov 02 2018We establish quantitative results for the statistical be\-ha\-vi\-our of \emph{infinite systems}. We consider two kinds of infinite system: i) a conservative dynamical system $(f,X,\mu)$ preserving a $\sigma$-finite measure $\mu$ such that $\mu(X)=\infty$; ... More
First detection of cyanamide (NH$_2$CN) towards solar-type protostarsDec 27 2017Searches for the prebiotically-relevant cyanamide (NH$_2$CN) towards solar-type protostars have not been reported in the literature. We here present the first detection of this species in the warm gas surrounding two solar-type protostars, using data ... More
On the RR Lyrae stars in globulars: IV. $ω$ Centauri Optical UBVRI PhotometrySep 16 2016New accurate and homogeneous optical UBVRI photometry has been obtained for variable stars in the Galactic globular $\omega$ Cen (NGC 5139). We secured 8202 CCD images covering a time interval of 24 years and a sky area of 84x48 arcmin. The current data ... More
SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray BurstsSep 23 2005Dec 28 2005We present u'g'r'i'BV photometry and optical spectroscopy of the Type Ib/Ic SN 2005bf covering the first ~100 days following discovery. The u'g'BV light curves displayed a double-peaked morphology, which is among Type Ib/Ic supernovae. The bolometric ... More
What can topology tell us about the neural code?May 06 2016Neuroscience is undergoing a period of rapid experimental progress and expansion. New mathematical tools, previously unknown in the neuroscience community, are now being used to tackle fundamental questions and analyze emerging data sets. Consistent with ... More
Robust Discrimination between Long-Range Dependence and a Change in MeanApr 04 2018In this paper we introduce a robust to outliers Wilcoxon change-point testing procedure, for distinguishing between short-range dependent time series with a change in mean at unknown time and stationary long-range dependent time series. We establish the ... More
astroquery: An Astronomical Web-Querying Package in PythonJan 14 2019astroquery is a collection of tools for requesting data from databases hosted on remote servers with interfaces exposed on the internet, including those with web pages but without formal application program interfaces (APIs). These tools are built on ... More
The Carnegie Supernova Project: Absolute Calibration and the Hubble ConstantSep 17 2018Sep 19 2018We present an analysis of the final data release of the Carnegie Supernova Project I, focusing on the absolute calibration of the luminosity-decline-rate relation for Type Ia supernovae (SNeIa) using new intrinsic color relations with respect to the color-stretch ... More
Structural investigation of the bilayer iridate Sr3Ir2O7Mar 23 2016A complete structural solution of the bilayer iridate compound Sr3Ir2O7 presently remains outstanding. Previously reported structures for this compound vary and all fail to explain weak structural violations observed in neutron scattering measurements ... More
The ground state energy of the three dimensional Ginzburg-Landau functional. Part~II: Surface regimeOct 19 2011We study the Ginzburg-Landau model of superconductivity in three dimensions and for strong external magnetic fields. For magnetic field strengths above the phenomenologically defined second critical field it is known from Physics that superconductivity ... More
Casimir Force between Atomically Thin Gold FilmsDec 03 2012Feb 13 2013We have used density functional theory to calculate the anisotropic dielectric functions for ultrathin gold sheets (composed of 1, 3, 6, and 15 atomic layers). Such films are important components in nano-electromechanical systems. When using correct dielectric ... More
Optical and Near-Infrared Observations of the Peculiar Type Ia Supernova 1999acJan 30 2006We present 39 nights of optical photometry, 34 nights of infrared photometry, and 4 nights of optical spectroscopy of the Type Ia SN 1999ac. This supernova was discovered two weeks before maximum light, and observations were begun shortly thereafter. ... More
Three Small Super-Earths Transiting the nearby star GJ 9827Sep 05 2017Nov 01 2017We report on the discovery of three transiting planets around GJ~9827. The planets have radii of 1.75$_{-0.12}^{+0.11 }$, 1.36$_{- 0.09 }^{+ 0.09}$, and 2.10$_{- 0.15 }^{+ 0.15 }$~R$_{\oplus}$, and periods of 1.20896, 3.6480, and 6.2014 days, respectively. ... More
Optical and Infrared Photometry of the Type Ia Supernovae 1991T, 1991bg, 1999ek, 2001bt, 2001cn, 2001cz, and 2002boSep 02 2004Dec 17 2004We present optical and/or infrared photometry of the Type Ia supernovae SN 1991T, SN 1991bg, SN 1999ek, SN 2001bt, SN 2001cn, SN 2001cz, and SN 2002bo. All but one of these supernovae have decline rate parameters Delta m_15(B) close to the median value ... More
Exploring the z=3-4 massive galaxy population with ZFOURGE: the prevalence of dusty and quiescent galaxiesMay 05 2014Our understanding of the redshift $z>3$ galaxy population relies largely on samples selected using the popular "dropout" technique, typically consisting of UV-bright galaxies with blue colors and prominent Lyman breaks. As it is currently unknown if these ... More
Monstrous BPS-Algebras and the Superstring Origin of MoonshineJan 20 2016Jun 06 2016We provide a physics derivation of Monstrous moonshine. We show that the McKay-Thompson series $T_g$, $g\in \mathbb{M}$, can be interpreted as supersymmetric indices counting spacetime BPS-states in certain heterotic string models. The invariance groups ... More
The Distance to SN 1999em from the Expanding Photosphere MethodMay 01 2001We present optical and IR spectroscopy of the first two months of evolution of the Type II SN 1999em. We combine these data with high-quality optical/IR photometry beginning only three days after shock breakout, in order to study the performance of the ... More
Three Small Planets Transiting a Hyades StarOct 19 2017Feb 15 2018We present the discovery of three small planets transiting K2-136 (LP 358 348, EPIC 247589423), a late K dwarf in the Hyades. The planets have orbital periods of $7.9757 \pm 0.0011$, $17.30681^{+0.00034}_{-0.00036}$, and $25.5715^{+0.0038}_{-0.0040}$ ... More
EPIC 211964830: A transiting multi-planet system in the Praesepe open clusterSep 06 2018Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable ... More
Field Galaxy Evolution Since Z~1 from a Sample of QSO Absorption-Selected GalaxiesOct 06 1994We present some of the results of a large survey aimed at establishing the properties of galaxies selected by their having produced detectable Mg~II $\lambda\lambda 2796$, 2803 absorption in the spectra of background QSOs. The present sample covers the ... More
BPS Algebras, Genus Zero, and the Heterotic MonsterJan 18 2017In this note, we expand on some technical issues raised in \cite{PPV} by the authors, as well as providing a friendly introduction to and summary of our previous work. We construct a set of heterotic string compactifications to 0+1 dimensions intimately ... More
The afterglow and elliptical host galaxy of the short gamma-ray burst GRB 050724Aug 04 2005Nov 22 2005Despite a rich phenomenology, gamma-ray bursts (GRBs) are divided into two classes based on their duration and spectral hardness -- the long-soft and the short-hard bursts. The discovery of afterglow emission from long GRBs was a watershed event, pinpointing ... More
Information Exchange via Surface Modified Resonance Energy TransferMay 17 2013The theory is presented for resonance interaction between two atoms in an excited configuration: one atom, the "receptor" of information (i.e. energy), adsorbed on a phospholipid surface and the other atom, the "emitter" of information (i.e. energy), ... More
Ultrathin Metallic Coatings Can Induce Quantum Levitation between NanosurfacesJun 05 2012There is an attractive Casimir-Lifshitz force between two silica surfaces in a liquid (bromobenze or toluene). We demonstrate that adding an ultrathin (5-50{\AA}) metallic nanocoating to one of the surfaces results in repulsive Casimir-Lifshitz forces ... More
Semantic Relational Object TrackingFeb 26 2019This paper addresses the topic of semantic world modeling by conjoining probabilistic reasoning and object anchoring. The proposed approach uses a so-called bottom-up object anchoring method that relies on the rich continuous data from perceptual sensor ... More
Intermolecular Casimir-Polder Forces in Water and near SurfacesSep 13 2014The Casimir-Polder force is an important long range interaction involved in adsorption and desorption of molecules in fluids. We explore Casimir-Polder interactions between methane molecules in water, and between a molecule in water near SiO2 and hexane ... More
New Near-Infrared $JHK_s$ light-curve templates for RR Lyrae variablesDec 16 2018We provide homogeneous optical (UBVRI) and near-infrared (JHK) time series photometry for 254 cluster (omega Cen, M4) and field RR Lyrae (RRL) variables. We ended up with more than 551,000 measurements. For 94 fundamental (RRab) and 51 first overtones ... More
Spectrum of electronic excitations due to the adsorption of atoms on metal surfacesNov 09 2006The time-dependent, mean-field Newns-Anderson model for a spin-polarised adsorbate approaching a metallic surface is solved in the wide-band limit. Equations for the time-evolution of the electronic structure of the adsorbate-metal system are derived ... More
Quantum Transport Length Scales in Silicon-based Semiconducting Nanowires: Surface Roughness EffectsJan 10 2008We report on a theoretical study of quantum charge transport in atomistic models of silicon nanowires with surface roughness-based disorder. Depending on the nanowires features (length, roughness profile) various conduction regimes are explored numerically ... More
Effect of electron-phonon interaction on the formation of one-dimensional electronic states in coupled Cl vacanciesMar 20 2015Mar 23 2015The formation of extended electron states in one-dimensional nanostructures is of key importance for the function of molecular electronics devices. Here we study the effects of strong electron-phonon interaction on the formation of extended electronic ... More
Robustness of Optimal Energy Thresholds in Photon-counting Spectral CTFeb 03 2018Aug 15 2018An important question when developing photon-counting detectors for computed tomography is how to select energy thresholds. In this work thresholds are optimized by maximizing signal-difference-to-noise ratio squared (SDNR2) in an optimally weighted image ... More
Resonance Interaction Induced by Metal Surfaces Catalyses Atom Pair BreakageApr 05 2013We present the theory for retarded resonance interaction between two identical atoms at arbitrary positions near a metal surface. The dipole-dipole resonance interaction force that binds isotropically excited atom pairs together in free space may turn ... More
Casimir forces in a Plasma: Possible Connections to Yukawa PotentialsSep 03 2014We present theoretical and numerical results for the screened Casimir effect between perfect metal surfaces in a plasma. We show how the Casimir effect in an electron-positron plasma can provide an important contribution to nuclear interactions. Our results ... More
Enlarged Molecules from Excited Atoms in NanochannelsJun 21 2012The resonance interaction that takes place in planar nanochannels between pairs of excited state atoms is explored. We consider interactions in channels of silica, zinc oxide and gold. The nanosized channels induce a dramatically different interaction ... More
Spontaneous non-stoichiometry and ordering of metal vacancies in degenerate insulatorsJan 01 2019We point to a class of materials representing an exception to the Daltonian view that compounds maintain integer stoichiometry at low temperatures, because forming stoichiometry-violating defects cost energy. We show that carriers in the conduction band ... More
Coupling and competition between ferroelectricity, magnetism, strain and oxygen vacancies in AMnO3 perovskitesJun 16 2016We use first-principles calculations based on density functional theory to investigate the interplay between oxygen vacancies, A-site cation size / tolerance factor, epitaxial strain, ferroelectricity and magnetism in the perovskite manganite series, ... More
DEMON: a Proposal for a Satellite-Borne Experiment to study Dark Matter and Dark EnergyMay 31 2006We outline a novel satellite mission concept, DEMON, aimed at advancing our comprehension of both dark matter and dark energy, taking full advantage of two complementary methods: weak lensing and the statistics of galaxy clusters. We intend to carry out ... More
Newns-Anderson model of chemicurrents in H/Cu and H/AgApr 16 2008The excitation of the electronic system induced by the adsorption of a hydrogen atom on the (111) surfaces of copper and silver is investigated using the time-dependent, mean-field Newns-Anderson model. Parameters for the model are obtained by fitting ... More
The uTPC Method: Improving the Position Resolution of Neutron Detectors Based on MPGDsJan 20 2015Due to the Helium-3 crisis, alternatives to the standard neutron detection techniques are becoming urgent. In addition, the instruments of the European Spallation Source (ESS) require advances in the state of the art of neutron detection. The instruments ... More
Electron-hole pair creation by atoms incident on a metal surfaceSep 30 2009Electron-hole pair creation by an adsorbate incident on a metal surface is described using \textit{ab initio} methods. The approach starts with standard first principles electronic structure theory, and proceeds to combine classical, quantum oscillator ... More
A Special Class of Rank 10 and 11 Coxeter GroupsOct 26 2006Jun 26 2008In the course of investigating regular subalgebras of E(10) related to cosmological solutions of 11-dimensional supergravity supporting an electric 4-form field, a class of rank 10 Coxeter subgroups of the Weyl group of E(10) was uncovered (hep-th/0606123). ... More
Fast readout of a single Cooper-pair box using its quantum capacitanceApr 19 2010We have fabricated a single Cooper-pair box (SCB) together with an on-chip lumped element resonator. By utilizing the quantum capacitance of the SCB, its state can be read out by detecting the phase of a radio-frequency (rf) signal reflected off the resonator. ... More
K2-106, a system containing a metal-rich planet and a planet of lower densityMay 11 2017Sep 26 2017Planets in the mass range from 2 to 15 MEarth are very diverse. Some of them have low densities, while others are very dense. By measuring the masses and radii, the mean densities, structure, and composition of the planets are constrained. These parameters ... More
$γ$-ray linear polarization measurements and $(g_{9/2})^{-3}$ neutron alignment in $^{91}$RuApr 11 2013Linear polarization measurements have been performed for $\gamma$-rays in $^{91}$Ru produced with the $^{58}$Ni($^{36}$Ar, $2p1n$$\gamma$)$^{91}$Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the $\gamma$-$\gamma$ ... More
Polarized Foreground Power Spectra from the HERA-19 Commissioning ArrayFeb 07 2018Foreground power dominates the measurements of interferometers that seek a statistical detection of highly-redshifted HI emission from the Epoch of Reionization (EoR). The inherent spectral smoothness of synchrotron radiation, the dominant foreground ... More
Nanoscale electromechanics to measure thermal conductivity, expansion and interfacial lossesOct 05 2016We study the effect of localized Joule heating on the mechanical properties of doubly clamped nanowires under tensile stress. Local heating results in systematic variation of the resonant frequency; these frequency changes result from thermal stresses ... More
A note on Borel--Cantelli lemmas for non-uniformly hyperbolic dynamical systemsMar 10 2011Let $(B_{i})$ be a sequence of measurable sets in a probability space $(X,\mathcal{B}, \mu)$ such that $\sum_{n=1}^{\infty} \mu (B_{i}) = \infty$. The classical Borel-Cantelli lemma states that if the sets $B_{i}$ are independent, then $\mu (\{x \in X ... More
Quasifinite representations of the Lie superalgebra of quantum pseudo differential operatorsJun 22 2007In this paper we extend general results obtained by V. Kac and J. Liberati, in "Unitary quasifinite representations of $W_\infty$", (Letters Math. Phys., 53 (2000), 11-27), for quasifinite highest weight representations of $\Z$-graded Lie algebras to ... More
The scaling limit of a particle system with long-range interactionDec 18 2015We describe the macroscopic behaviour of a particle system with long-range interactions. We describe conditions on the interaction strength in dependency of the distance of the particles, such that the scaling limit of the particle system is a well-posed ... More
On the efficiency of Gini's mean differenceMay 20 2014We examine the efficiency of the mean deviation and Gini's mean difference (the mean of all pairwise distances). Our findings support the viewpoint that Gini's mean difference combines the advantages of the mean deviation and the standard deviation.
Contact electrification and the work of adhesionMay 13 2013We present a general theory for the contribution from contact electrification to the work necessary to separate two solid bodies. The theory depends on the surface charge density correlation function, which we deduce from Kelvin Force Microscopy (KFM) ... More