total 201874took 0.15s

A dynamical magnetic field accompanying the motion of ferroelectric domain wallsApr 12 2019The recently proposed dynamical multiferroic effect describes the generation of magnetization from temporally varying electric polarization. Here, we show that the effect can lead to a magnetic field at moving ferroelectric domain walls, where the rearrangement ... More

Ultrafast Structure Switching through Nonlinear PhononicsJul 06 2016We describe an ultrafast coherent control of the transient structural distortion arising from nonlinear phononics in ErFeO$_3$. Using density functional theory, we calculate the structural properties as input to an anharmonic phonon model that describes ... More

Dynamical MultiferroicityDec 19 2016Apr 10 2017An appealing mechanism for inducing multiferroicity in materials is the generation of electric polarization by a spatially varying magnetization that is coupled to the lattice through the spin-orbit interaction. Here we describe the reciprocal effect, ... More

Sum-frequency ionic Raman scatteringJan 18 2018Jan 29 2018In a recent report sum-frequency excitation of a Raman-active phonon was experimentally demonstrated for the first time. This mechanism is the sibling of impulsive stimulated Raman scattering, in which difference-frequency components of a light field ... More

Orbital magnetic moments of phononsDec 13 2018In ionic materials, circularly polarized phonons carry orbital magnetic moments that arise from circular motions of the ions, and which interact with other magnetic moments or fields. Here, we calculate the orbital magnetic moments of phonons in 35 different ... More

Hidden Quantum Markov Models with one qubitJul 18 2012Hidden Markov Models (HMMs) have become very popular as a computational tool for the analysis of sequential data. They are memoryless machines which transition from one internal state to another, while producing symbols. These symbols constitute the output ... More

Continuous ground-state degeneracy of classical dipoles on regular latticesMar 04 2019Dipolar interactions are crucial in the modeling of many complex magnetic systems, such as the pyrochlores and artificial spin systems. Remarkably, many classical dipolar coupled spin systems exhibit a continuous ground-state degeneracy, which is unexpected ... More

Security for the Industrial IoT: The Case for Information-Centric NetworkingOct 10 2018Mar 05 2019Industrial production plants traditionally include sensors for monitoring or documenting processes, and actuators for enabling corrective actions in cases of misconfigurations, failures, or dangerous events. With the advent of the IoT, embedded controllers ... More

Topological entropy and distributional chaos in hereditary shifts with applications to spacing shifts and beta shiftsNov 01 2011Jan 08 2012Positive topological entropy and distributional chaos are characterized for hereditary shifts. A hereditary shift has positive topological entropy if and only if it is DC2-chaotic (or equivalently, DC3-chaotic) if and only if it is not uniquely ergodic. ... More

A Planar Scanning Probe MicroscopeMay 08 2018Scanning probe microscopy (SPM) is traditionally based on very sharp tips, where the small size of the apex is critical for resolution. This paradigm is about to shift, since a novel generation of planar probes (color centers in diamond, superconducting ... More

On Uniqueness of Weak Solutions for the Thin-Film EquationOct 23 2013In any number of space variables, we study the Cauchy problem related to the thin-film equation in the simplest case of a linearly degenerate mobility. This equation, derived from a lubrication approximation, also models the surface tension dominated ... More

Groups with graphical C(6) and C(7) small cancellation presentationsSep 30 2012Jul 24 2014We extend fundamental results of small cancellation theory to groups whose presentations satisfy the generalizations of the classical C(6) and C(7) conditions in graphical small cancellation theory. Using these graphical small cancellation conditions, ... More

The Zak transform on strongly proper $G$-spaces and its applicationsMay 17 2016The Zak transform on $\mathbb{R}^d$ is an important tool in condensed matter physics, signal processing, time-frequency analysis, and harmonic analysis in general. This article introduces a generalization of the Zak transform to a class of locally compact ... More

Testing the standard model of cosmology with the SKA: the cosmic radio dipoleOct 11 2018Mar 21 2019The dipole anisotropy seen in the {cosmic microwave background radiation} is interpreted as due to our peculiar motion. The Cosmological Principle implies that this cosmic dipole signal should also be present, with the same direction, in the large-scale ... More

SKA and the Cosmic Radio DipoleOct 12 2018We study the prospects to measure the cosmic radio dipole by means of continuum surveys with the Square Kilometre Array. Such a measurement will allow a critical test of the cosmological principle. It will test whether the cosmic rest frame defined by ... More

The non-existence of sharply $2$-transitive sets of permutations in $\mathrm{Sp}(2d,2)$ of degree $2^{2d-1} \pm 2^{d-1}$Feb 16 2016We use M\"uller and Nagy's method of contradicting subsets to give a new proof for the non-existence of sharply $2$-transitive subsets of the symplectic groups $\mathrm{Sp}(2d,2)$ in their doubly-transitive actions of degrees $2^{2d-1}\pm 2^{d-1}$. The ... More

Bordism of constrained Morse functionsMar 29 2018We call a Morse function $f$ on a closed manifold $k$-constrained if neither $f$ nor $-f$ has critical points of indefinite Morse index $< k$. In this paper we study bordism groups of $k$-constrained Morse functions, and thus interpolate between the case ... More

GREEND: An Energy Consumption Dataset of Households in Italy and AustriaMay 13 2014May 22 2014Home energy management systems can be used to monitor and optimize consumption and local production from renewable energy. To assess solutions before their deployment, researchers and designers of those systems demand for energy consumption datasets. ... More

G-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic fieldAug 12 2018Dec 04 2018We analyze orbital effects of an in-plane magnetic field on the spin structure of states of a gated quantum dot based in a two-dimensional electron gas. Starting with a $k \cdot p$ Hamiltonian, we perturbatively calculate these effects for the conduction ... More

Animating an Autonomous 3D Talking AvatarMar 13 2019One of the main challenges with embodying a conversational agent is annotating how and when motions can be played and composed together in real-time, without any visual artifact. The inherent problem is to do so---for a large amount of motions---without ... More

Towards Safer Smart Contracts: A Survey of Languages and Verification MethodsSep 26 2018Nov 01 2018With a market capitalisation of over USD 205 billion in just under ten years, public distributed ledgers have experienced significant adoption. Apart from novel consensus mechanisms, their success is also accountable to smart contracts. These programs ... More

Optical waveguide devices modulated by surface acoustic wavesNov 07 2018This paper reviews the application of coherent acoustic phonons in the form of piezoelectrically-generated surface acoustic waves to control the response of integrated photonic acousto-optic waveguide structures. We first address the fundamental properties ... More

Gauge dependence and renormalization of tan(beta)Oct 28 2002Renormalization schemes for tan(beta) are discussed in view of their gauge dependence. It is shown that several common renormalization schemes lead to a gauge-dependent definition of tan(beta), whereas two classes of gauge-independent schemes show even ... More

Gauge dependence and renormalization of $\tanβ$ in the MSSMMay 24 2002May 24 2004Well-known and newly developed renormalization schemes for $\tan\beta$ are analyzed in view of three desirable properties: gauge independence, process independence, and numerical stability in perturbation theory. Arguments are provided that no scheme ... More

Quantitative minimality of strictly stable extremal submanifolds in a flat neighbourhoodSep 08 2017Apr 26 2018In this paper we extend the results of "A strong minimax property of nondegenerate minimal submanifolds" by White, where it is proved that any smooth, compact submanifold, which is a strictly stable critical point for an elliptic parametric functional, ... More

Optimal Error Estimates for Fully Discrete Galerkin Approximations of Semilinear Parabolic EquationsJul 25 2017We consider a semilinear parabolic equation with a large class of nonlinearities without any growth conditions. We discretize the problem with a discontinuous Galerkin scheme dG(0) in time (which is a variant of the implicit Euler scheme) and with conforming ... More

The chromatic Brauer category and its linear representationsFeb 14 2019The Brauer category is a symmetric strict monoidal category that arises as a categorification of the Brauer algebras in the context of Banagl's framework of positive topological field theories (TFTs). We introduce the chromatic Brauer category as an enrichment ... More

Quantum mechanical picture of the coupling between interlayer electronic excitations and infrared active phonons in bilayer cuprate superconductorsMar 29 2012The formula frequently used to describe the c-axis infrared response of the coupled electron-phonon system of bilayer cuprate superconductors and providing important insights into the physics of these materials has been originally obtained at the level ... More

H_2D^+: a light on baryonic dark matter?Feb 27 2006It has been suggested that the dark halos of galaxies are constituted by cloudlets of cold (< 10 K) H_2 and dense (> 10^7$ cm^{-3}) molecular gas. Such gas is extremely difficult to detect, because the classical tracers of molecular gas, CO and/or dust ... More

Fluctuations of Rectangular Young Diagrams of Interlacing Wigner EigenvaluesAug 18 2016Jul 10 2018We prove a new CLT for the difference of linear eigenvalue statistics of a Wigner random matrix $H$ and its minor $\hat H$ and find that the fluctuation is much smaller than the fluctuations of the individual linear statistics, as a consequence of the ... More

Revealing stellar brightness profiles by means of microlensing fold causticsFeb 24 2004Jun 23 2004With a handful of measurements of limb-darkening coefficients, galactic microlensing has already proven to be a powerful technique for studying atmospheres of distant stars. Survey campaigns such as OGLE-III are capable of providing ~ 10 suitable target ... More

Determining the abundance of extragalactic planetsSep 23 2003Oct 23 2003Gravitational microlensing provides a unique technique to reveal information about extragalactic planets. A network of at least four 2m-class telescopes distributed around the northern hemisphere could probe 15-35 jupiters and 4-10 saturns around M31 ... More

The binary gravitational lens and its extreme casesMar 01 1999Sep 10 1999The transition of the binary gravitational lens from the equal mass case to small (planetary) mass ratios q is studied. It is shown how the limit of a (pure shear) Chang-Refsdal lens is approached, under what conditions the Chang-Refsdal approximation ... More

Parity Polytopes and BinarizationMar 28 2018Apr 18 2018We consider generalizations of parity polytopes whose variables, in addition to a parity constraint, satisfy certain ordering constraints. More precisely, the variable domain is partitioned into $k$ contiguous groups, and within each group, we require ... More

Spotting Information biases in Chinese and Western MediaJan 06 2017Newswire and Social Media are the major sources of information in our time. While the topical demographic of Western Media was subjects of studies in the past, less is known about Chinese Media. In this paper, we apply event detection and tracking technology ... More

Surface Spline Approximation on SO(3)Nov 10 2009Nov 23 2010The purpose of this article is to introduce a new class of kernels on SO(3) for approximation and interpolation, and to estimate the approximation power of the associated spaces. The kernels we consider arise as linear combinations of Green's functions ... More

Infinitely presented graphical small cancellation groups are acylindrically hyperbolicAug 19 2014Feb 09 2016We prove that infinitely presented graphical $Gr(7)$ small cancellation groups are acylindrically hyperbolic. In particular, infinitely presented classical $C(7)$-groups and, hence, classical $C'(\frac{1}{6})$-groups are acylindrically hyperbolic. We ... More

Selection Criterion for Log-Linear Models Using Statistical Learning TheoryFeb 07 2003Log-linear models are a well-established method for describing statistical dependencies among a set of n random variables. The observed frequencies of the n-tuples are explained by a joint probability such that its logarithm is a sum of functions, where ... More

Adaptive Contouring -- an efficient way to calculate microlensing light curves of extended sourcesMar 13 2007The availability of a robust and efficient routine for calculating light curves of a finite source magnified due to bending its light by the gravitational field of an intervening binary lens is essential for determining the characteristics of planets ... More

Lens binarity vs limb darkening in close-impact galactic microlensing eventsOct 18 2004Although point caustics harbour a larger potential for measuring the brightness profile of stars during the course of a microlensing event than (line-shaped) fold caustics, the effect of lens binarity significantly limits the achievable accuracy. Therefore, ... More

Uncovering stellar atmospheres with gravitational microlensing telescopesDec 08 2003A strong differential magnification over the face of the source star passing the caustic created by a binary lens star allows to measure its radial intensity profile with an angular resolution of 20-60 nas from broad-band photometric observations for ... More

A PromiseBQP-complete String Rewriting ProblemMay 08 2007Jan 17 2008We are given three strings s, t, and t' of length L over some fixed finite alphabet and an integer m that is polylogarithmic in L. We have a symmetric relation on substrings of constant length that specifies which substrings are allowed to be replaced ... More

The speed of the tagged particle in the exclusion process on Galton-Watson treesMar 12 2019We study two different versions of the simple exclusion process on augmented Galton-Watson trees, the constant speed model and the varying speed model. In both cases, the simple exclusion process starts from an equilibrium distribution with non-vanishing ... More

Refined analysis of sparse MIMO radarSep 11 2015We analyze a multiple-input multiple-output (MIMO) radar model and provide recovery results for a compressed sensing (CS) approach. In MIMO radar different pulses are emitted by several transmitters and the echoes are recorded at several receiver nodes. ... More

Different lattice geometries with synthetic dimensionApr 19 2016The possibility of creating different geometries with the help of an extra synthetic dimension in optical lattices is studied. Additional linear potential and Raman assisted tunnelings are used to engineer well controlled tunnelings between available ... More

Fluctuations of Functions of Wigner MatricesOct 22 2016Nov 16 2016We show that matrix elements of functions of $N\times N$ Wigner matrices fluctuate on a scale of order $N^{-1/2}$ and we identify the limiting fluctuation. Our result holds for any function $f$ of the matrix that has bounded variation and thus considerably ... More

Parameter degeneracies and (un)predictability of gravitational microlensing eventsNov 25 2008(abridged) Some difficulties in determining the physical properties that lead to observed anomalies in microlensing light curves, such as the mass and separation of extra-solar planets orbiting the lens star, or the relative source-lens parallax, are ... More

Theory and practice of microlensing lightcurves around fold singularitiesSep 22 2003Jun 23 2004Among all galactic microlensing events, those involving a passage of the observed source star over the caustic created by a binary lens are particularly useful in providing information about stellar atmospheres, the dynamics of stellar populations in ... More

A robust and efficient method for calculating the magnification of extended sources caused by gravitational lensesApr 06 1998To determine the magnification of an extended source caused by gravitational lensing one has to perform a two-dimensional integral over point-source magnifications in general. Since the point-source magnification jumps to an infinite value on caustics, ... More

Galactic microlensing with rotating binariesFeb 04 1997Sep 09 1997The influence of rotating binary systems on the light curves of galactic microlensing events is studied. Three different rotating binary systems are discussed: a rotating binary lens, a rotating binary source, and the motion of the earth around the sun ... More

Planetary mass function and planetary systemsSep 23 2010With planets orbiting stars, a planetary mass function should not be seen as a low-mass extension of the stellar mass function, but a proper formalism needs to take care of the fact that the statistical properties of planet populations are linked to the ... More

Stochastical distributions of lens and source properties for observed galactic microlensing eventsJul 22 2005Dec 27 2005A comprehensive new approach is presented for deriving probability densities of physical properties characterizing lens or source that constitute an observed galactic microlensing event. While previously encountered problems are overcome, constraints ... More

Interferometric Evidence for Quantum Heated Particles in the Inner Region of Protoplanetary Disks around Herbig StarsDec 19 2016To understand the chemical composition of planets, it is important to know the chemical composition of the region where they form in protoplanetary disks. Due to its fundamental role in chemical and biological processes, carbon is a key element to trace. ... More

Where are the binary source galactic microlensing events?Jan 13 1998Though there have been some galactic microlensing events which show a clear signature of a binary lens, no event has yet been claimed as due to lensing of a binary source. Here I argue that this may be due to the fact that most of the binary source events ... More

Estimating physical quantities for an observed galactic microlensing eventJan 08 1997Nov 13 1997For a given spatial distribution of the lenses and distribution of the transverse velocity of the lens relative to the line-of-sight, a probability distribution for the lens mass for a single observed event is derived. In addition, similar probability ... More

Uncovering galactic and extragalactic planets by gravitational microlensingDec 08 2003With its planet detection efficiency reaching a maximum for orbital radii between 1 and 10 AU, microlensing provides a unique sensitivity to planetary systems similar to our own around galactic and even extragalactic stars acting as lenses on observed ... More

Ambiguities in fits of binary lens galactic microlensing eventsFeb 28 1997Aug 13 1998For observed galactic microlensing events only one fit is usually presented, though, especially for a binary lens, several fits may be possible. This has been shown for the MACHO LMC#1 event (Dominik & Hirshfeld 1996). Here I discuss the strong binary ... More

An anomaly detector with immediate feedback to hunt for planets of Earth mass and below by microlensingJun 18 2007(abridged) The discovery of OGLE 2005-BLG-390Lb, the first cool rocky/icy exoplanet, impressively demonstrated the sensitivity of the microlensing technique to extra-solar planets below 10 M_earth. A planet of 1 M_earth in the same spot would have provided ... More

Color centers in diamond as novel probes of superconductivityAug 09 2018Magnetic imaging using color centers in diamond through both scanning and wide-field methods offers a combination of unique capabilities for studying superconductivity, for example, enabling accurate vector magnetometry at high temperature or high pressure, ... More

A one-parameter family of degree 36 polynomials with PSp(6,2) as Galois group over Q(t)Sep 26 2018We present a one-parameter family of degree 36 polynomials with the symplectic 2-transitive group PSp(6,2) as Galois group over Q(t).

Deuterated H$_3^+$ in proto-planetary disksJun 11 2005Probing the gas and dust in proto-planetary disks is central for understanding the process of planet formation. In disks surrounding solar type protostars, the bulk of the disk mass resides in the outer midplane, which is cold ($\leq$20 K), dense ($\geq ... More

Emulating Human Developmental Stages with Bayesian Neural NetworksFeb 20 2019We compare the acquisition of knowledge in humans and machines. Research from the field of developmental psychology indicates, that human-employed hypothesis are initially guided by simple rules, before evolving into more complex theories. This observation ... More

Hankel determinants of random moment sequencesAug 03 2015Jun 27 2016For $ t \in [0,1]$ let $\underline{H}_{2\lfloor nt \rfloor} = ( m_{i+j})_{i,j=0}^{\lfloor nt \rfloor} $ denote the Hankel matrix of order $2\lfloor nt \rfloor$ of a random vector $(m_1,\ldots ,m_{2n})$ on the moment space $\mathcal{M}_{2n}(I)$ of all ... More

The footprint of cometary dust analogs: I. Laboratory experiments of low-velocity impacts and comparison with Rosetta dataMay 19 2017Cometary dust provides a unique window on dust growth mechanisms during the onset of planet formation. Measurements by the Rosetta spacecraft show that the dust in the coma of comet 67P/Churyumov-Gerasimenko has a granular structure at size scales from ... More

Turing Completeness of Finite, Epistemic ProgramsJun 21 2017In this note, we show the class of finite, epistemic programs to be Turing complete. Epistemic programs is a widely used update mechanism used in epistemic logic, where it such are a special type of action models: One which does not contain postconditions. ... More

Science with an ngVLA: Imaging Cold Gas to 1 kpc Scales in High-Redshift Galaxies with the ngVLAOct 18 2018The next generation Very Large Array (ngVLA) will revolutionize our understanding of the distant Universe via the detection of cold molecular gas in the first galaxies. Its impact on studies of galaxy characterization via detailed gas dynamics will provide ... More

Can microlensing fold caustics reveal a second stellar limb-darkening coefficient?Mar 09 2004May 17 2004Dense high-precision photometry of microlensed stars during a fold-caustic passage can be used to reveal their intensity profiles from which the temperature of the stellar atmosphere as function of fractional radius can be derived. While the capabilities ... More

Characterization of Hydrogen Plasma Defined Graphene EdgesMar 16 2019We investigate the quality of hydrogen plasma defined graphene edges by Raman spectroscopy, atomic resolution AFM and low temperature electronic transport measurements. The exposure of graphite samples to a remote hydrogen plasma leads to the formation ... More

On the onset of cosmological backreactionFeb 07 2007Sep 17 2007Cosmological backreaction has been suggested as an explanation of dark energy and is heavily disputed since. We combine cosmological perturbation theory with Buchert's non-perturbative framework, calculate the relevant averaged observables up to second ... More

The footprint of cometary dust analogues: II. Morphology as a tracer of tensile strength and application to dust collection by the Rosetta spacecraftApr 16 2019The structure of cometary dust is a tracer of growth processes in the formation of planetesimals. Instrumentation on board the Rosetta mission to comet 67P/Churyumov- Gerasimenko captured dust particles and analysed them in situ. However, these deposits ... More

Probing MACHOs by observation of M31 pixel lensing with the 1.5m Loiano telescopeApr 11 2007We analyse a series of pilot observations in order to study microlensing of (unresolved) stars in M31 with the 1.5m Loiano telescope, including observations on both identified variable source stars and reported microlensing events. We also look for previously ... More

Disks ARound TTauri Stars with Sphere (DARTTS-S) I: Sphere / IRDIS Polarimetric Imaging of 8 prominent TTauri DisksMar 29 2018Nov 11 2018We present the first part of our DARTTS-S (Disks ARound TTauri Stars with SPHERE) survey: Observations of 8 TTauri stars which were selected based on their strong (sub-)mm excesses using SPHERE / IRDIS polarimetric differential imaging (PDI) in the J ... More

Global galactic dynamo driven by cosmic-rays and exploding magnetized starsJul 28 2009Nov 05 2009We report first results of first global galactic-scale CR-MHD simulations of cosmic-ray-driven dynamo. We investigate the dynamics of magnetized interstellar medium (ISM), which is dynamically coupled with the cosmic-ray (CR) gas. We assume that exploding ... More

Rational Parameter Rays of The Multibrot SetsOct 24 2014Aug 12 2015We prove a structure theorem for the multibrot sets, which are the higher degree analogues of the Mandelbrot set, and give a complete picture of the landing behavior of the rational parameter rays and the bifurcation phenomenon. Our proof is inspired ... More

Radial and vertical dust transport inhibit refractory carbon depletion in protoplanetary disksSep 05 2018The Earth is strongly depleted in carbon compared to the dust in the ISM, implying efficient removal of refractory carbon before parent body formation. It has been argued that grains get rid of their carbon through oxidation and photolysis in the exposed ... More

$\ell_1$ Regularized Gradient Temporal-Difference LearningOct 05 2016In this paper, we study the Temporal Difference (TD) learning with linear value function approximation. It is well known that most TD learning algorithms are unstable with linear function approximation and off-policy learning. Recent development of Gradient ... More

Generic Points for Dynamical Systems with Average ShadowingMar 13 2016Oct 09 2016It is proved that to every invariant measure of a compact dynamical system one can associate a certain asymptotic pseudo orbit such that any point asymptotically tracing in average that pseudo orbit is generic for the measure. It follows that the asymptotic ... More

Quantum algorithms for testing Boolean functionsJun 08 2010We discuss quantum algorithms, based on the Bernstein-Vazirani algorithm, for finding which variables a Boolean function depends on. There are 2^n possible linear Boolean functions of n variables; given a linear Boolean function, the Bernstein-Vazirani ... More

Arcwise connectedness of the set of ergodic measures of hereditary shiftsOct 03 2016Oct 07 2016We show that the set of ergodic invariant measures of a shift space with a safe symbol (this includes all hereditary shifts) is arcwise connected when endowed with the $d$-bar metric. As a consequence the set of ergodic measures of such a shift is also ... More

Planetary microlensing signals from the orbital motion of the source star around the common barycentreOct 21 2008With several detections, the technique of gravitational microlensing has proven useful for studying planets that orbit stars at Galactic distances, and it can even be applied to detect planets in neighbouring galaxies. So far, planet detections by microlensing ... More

Giant magnetic response of a two-dimensional antiferromagnetApr 23 2018A fundamental difference between antiferromagnets and ferromagnets is the lack of linear coupling to a uniform magnetic field due to the staggered order parameter. Such coupling is possible via the Dzyaloshinskii-Moriya (DM) interaction but at the expense ... More

A panorama of specification-like properties and their consequencesMar 25 2015May 26 2015We offer an overview of the specification property, its relatives and their consequences. We examine relations between specification-like properties and such notions as: mixing, entropy, the structure of the simplex of invariant measures, and various ... More

Mixing properties in coded systemsMar 10 2015We show that topological mixing, weak mixing and total transitivity are equivalent for coded systems. We provide an example of a mixing coded system which cannot be approximated by any increasing sequence of mixing shifts of finite type, has only periodic ... More

On almost specification and average shadowing propertiesJun 29 2013In this paper we study relations between almost specification property, asymptotic average shadowing property and average shadowing property for dynamical systems on compact metric spaces. We show implications between these properties and relate them ... More

Dopant-induced ignition of helium nanoplasmas -- a mechanistic studySep 23 2017Helium (He) nanodroplets irradiated by intense near-infrared laser pulses form a nanoplasma by avalanche-like electron impact ionizations even at lower laser intensities where He is not directly field ionized, provided that the droplets contain a few ... More

Transitive dendrite map with zero entropyMar 10 2015Hoehn and Mouron [Ergod. Th. \& Dynam. Sys. (2014) \textbf{34}, 1897--1913] constructed a map on the universal dendrite that is topologically weakly mixing but not mixing. We modify the Hoehn-Mouron example to show that there exists a transitive (even ... More

M31 Pixel Lensing PLAN Campaign: MACHO Lensing and Self Lensing SignalsJan 13 2014We present the final analysis of the observational campaign carried out by the PLAN (Pixel Lensing Andromeda) collaboration to detect a dark matter signal in form of MACHOs through the microlensing effect. The campaign consists of about 1 month/year observations ... More

Shadows and asymmetries in the T Tauri disk HD 143006: Evidence for a misaligned inner diskSep 04 2018While planet formation is thought to occur early in the history of a protoplanetary disk, the presence of planets embedded in disks, or of other processes driving disk evolution, might be traced from their imprints on the disk structure. We observed the ... More

Thermoelectric properties of gapped bilayer grapheneOct 04 2018Mar 28 2019Unlike in conventional semiconductors, both the chemical potential and the band gap in bilayer graphene (BLG) can be tuned via application of external electric field. Among numerous device implications, this property also designates BLG as a candidate ... More

Fundamental domains in the Einstein UniverseJul 24 2013Jun 25 2014We will discuss fundamental domains for actions of discrete groups on the 3-dimensional Einstein Universe. These will be bounded by crooked surfaces, which are conformal compactifications of surfaces that arise in the construction of Margulis spacetimes. ... More

Multipliers for Continuous Frames in Hilbert SpacesNov 10 2011Feb 07 2012In this paper we examine the general theory of continuous frame multipliers in Hilbert space. These operators are a generalization of the widely used notion of (discrete) frame multipliers. Well-known examples include Anti-Wick operators, STFT multipliers ... More

On entropy of dynamical systems with almost specificationNov 07 2014We construct a family of shift spaces with almost specification and multiple measures of maximal entropy. This answers a question from Climenhaga and Thompson [Israel J. Math. 192 (2012), no. 2, 785--817]. Elaborating on our examples we also prove that ... More

Gromov's random monsters do not act non-elementarily on hyperbolic spacesMay 29 2017We show that Gromov's monster groups arising from i.i.d. labelings of expander graphs do not admit non-elementary actions on geodesic hyperbolic spaces. The proof relies on comparing properties of random walks on randomly labeled graphs and on groups ... More

Evidence for a superconducting origin of prominent features of the in-plane infrared response of underdoped cuprates and implications of their persistence above $T_{\mathrm{c}}$Jan 15 2014We report on results of our analysis of published experimental data of the in-plane infrared response of two representative underdoped high-$T_{\mathrm{c}}$ cuprate superconductors, focusing on a characteristic gap feature in the spectra of the real part ... More

Far-infrared and Molecular CO Emission From the Host Galaxies of Faint Quasars at z~6Jul 25 2011Aug 05 2011We present new millimeter and radio observations of nine z~6 quasars discovered in deep optical and near-infrared surveys. We observed the 250 GHz continuum in eight of the nine objects and detected three of them. New 1.4 GHz radio continuum data have ... More

CO (2-1) Line Emission in Redshift 6 Quasar Host GalaxiesMay 21 2011We report new observations of CO (2-1) line emission toward five z~6 quasars using the Ka-band receiver system on the Expanded Very Large Array (EVLA). Strong detections were obtained in two of them, SDSS J092721.82+200123.7 and CFHQS J142952.17+544717.6, ... More

Resolving the interstellar medium in the nuclear region of two z=5.78 quasar host galaxies with ALMAApr 16 2019We present ALMA observations of the [CII] 158 micron fine structure line and dust continuum emission from two quasars, SDSSJ104433.04-012502.2 and SDSSJ012958.51-003539.7, at z=5.78. The ALMA observations at 0.2" resolution map the dust and gas on kpc ... More

Precision of inflationary predictions and recent CMB anisotropy dataOct 23 2000Inflationary predictions of the cosmic microwave background anisotropy are often based on the slow-roll approximation. We study the precision of these predictions and compare them with the recent data from BOOMERanG and MAXIMA-1.

Thermoelectric properties of gapped bilayer grapheneOct 04 2018Unlike in conventional semiconductors, both the chemical potential and the band gap in bilayer graphene (BLG) can be tuned via application of external electric field. Among numerous device implications, this property also designates BLG as a candidate ... More

Quantum parameter estimation using multi-mode Gaussian statesFeb 27 2015Jul 15 2015Gaussian states are of increasing interest in the estimation of physical parameters because they are easy to prepare and manipulate in experiments. In this article, we derive formulae for the optimal estimation of parameters using two- and multi-mode ... More