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The rp-process and new measurements of beta-delayed proton decay of light Ag and Cd isotopesJul 05 1996Recent network calculations suggest that a high temperature rp-process could explain the abundances of light Mo and Ru isotopes, which have long challenged models of p-process nuclide production. Important ingredients to network calculations involving ... More

Helium Ignition on Accreting Neutron Stars with a New Triple-alpha Reaction RateAug 19 2010Nov 01 2010We investigate the effect of a new triple-alpha reaction rate from Ogata et al. (2009) on helium ignition conditions on accreting neutron stars and on the properties of the subsequent type I X-ray burst. We find that the new rate leads to significantly ... More

Revival of The Stalled Core-Collapse Supernova Shock Triggered by Precollapse Asphericity in the Progenitor StarSep 10 2013Oct 16 2013Multi-dimensional simulations of advanced nuclear burning stages of massive stars suggest that the Si/O layers of presupernova stars harbor large deviations from the spherical symmetry typically assumed for presupernova stellar structure. We carry out ... More

Study of multi-neutron emission in the $β$-decay of $^{11}$LiJun 11 2019The kinematics of two-neutron emission following the $\beta$-decay of $^{11}$Li was investigated for the first time by detecting the two neutrons in coincidence and by measuring their angle and energy. An array of liquid-scintillator neutron detectors ... More

A New Open-Source Nuclear Equation of State Framework based on the Liquid-Drop Model with Skyrme InteractionJul 05 2017Jul 28 2017The equation of state (EOS) of dense matter is an essential ingredient for numerical simulations of core-collapse supernovae and neutron star mergers. The properties of matter near and above nuclear saturation density are uncertain, which translates into ... More

Multivariate Regression Analysis of Gravitational Waves from Rotating Core CollapseJun 04 2014We present a new multivariate regression model for analysis and parameter estimation of gravitational waves observed from well but not perfectly modeled sources such as core-collapse supernovae. Our approach is based on a principal component decomposition ... More

Numerical Modeling of the Early Light Curves of Type IIP SupernovaeMar 28 2016The early rise of Type IIP supernovae (SN IIP) provides important information for constraining the properties of their progenitors. This can in turn be compared to pre-explosion imaging constraints and stellar models to develop a more complete picture ... More

The Black Hole Formation ProbabilityJun 18 2014Dec 03 2014A longstanding question in stellar evolution is which massive stars produce black holes (BHs) rather than neutron stars (NSs) upon death. It has been common practice to assume that a given zero-age main sequence (ZAMS) mass star (and perhaps a given metallicity) ... More

Measuring the Angular Momentum Distribution in Core-Collapse Supernova Progenitors with Gravitational WavesNov 14 2013The late collapse, core bounce, and the early postbounce phase of rotating core collapse leads to a characteristic gravitational wave (GW) signal. The precise shape of the signal is governed by the interplay of gravity, rotation, nuclear equation of state ... More

2D Multi-Angle, Multi-Group Neutrino Radiation-Hydrodynamic Simulations of Postbounce Supernova CoresApr 01 2008Jun 25 2008We perform axisymmetric (2D) multi-angle, multi-group neutrino radiation-hydrodynamic calculations of the postbounce phase of core-collapse supernovae using a genuinely 2D discrete-ordinate (S_n) method. We follow the long-term postbounce evolution of ... More

Three-Dimensional General-Relativistic Hydrodynamic Simulations of Binary Neutron Star Coalescence and Stellar Collapse with Multipatch GridsDec 05 2012We present a new three-dimensional general-relativistic hydrodynamic evolution scheme coupled to dynamical spacetime evolutions which is capable of efficiently simulating stellar collapse, isolated neutron stars, black hole formation, and binary neutron ... More

Wireless Optimisation via Convex Bandits: Unlicensed LTE/WiFi CoexistenceFeb 05 2018Bandit Convex Optimisation (BCO) is a powerful framework for sequential decision-making in non-stationary and partially observable environments. In a BCO problem, a decision-maker sequentially picks actions to minimize the cumulative cost associated with ... More

A low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V2O7Oct 24 2002We report the results of measurements of the dc-susceptibility and the 23Na-NMR response of Na2V2O7, a recently synthesized, non metallic low dimensional spin system. Our results indicate that upon reducing the temperature to below 100 K, the V^{4+} moments ... More

Maximum Entropy for Gravitational Wave Data Analysis: Inferring the Physical Parameters of Core-Collapse SupernovaeApr 17 2007Dec 14 2007The gravitational wave signal arising from the collapsing iron core of a Type II supernova progenitor star carries with it the imprint of the progenitor's mass, rotation rate, degree of differential rotation, and the bounce depth. Here, we show how to ... More

Features of the Acoustic Mechanism of Core-Collapse Supernova ExplosionsOct 05 2006In the context of 2D, axisymmetric, multi-group, radiation/hydrodynamic simulations of core-collapse supernovae over the full 180$^{\circ}$ domain, we present an exploration of the progenitor dependence of the acoustic mechanism of explosion. All progenitor ... More

Neutrino-Driven Convection in Core-Collapse Supernovae: High-Resolution SimulationsOct 16 2015Mar 22 2016We present results from high-resolution semi-global simulations of neutrino-driven convection in core-collapse supernovae. We employ an idealized setup with parametrized neutrino heating/cooling and nuclear dissociation at the shock front. We study the ... More

Evidence for Blow-out in the Low-mass Dwarf Galaxy Holmberg IOct 05 2001We present radio and optical observations of Holmberg I (HoI), a member of the M81 group of galaxies (distance 3.6Mpc). HoI is a low-mass, low surface- brightness dwarf galaxy. High-resolution multi-array VLA HI observations reveal a supergiant shell ... More

Doping dependence of the Raman spectrum of defected grapheneMay 16 2014We investigate the evolution of the Raman spectrum of defected graphene as a function of doping. Polymer electrolyte gating allows us to move the Fermi level up to 0.7eV, as monitored by \textit{in-situ} Hall-effect measurements. For a given number of ... More

Formation and Coalescence of Cosmological Supermassive Black Hole Binaries in Supermassive Star CollapseApr 29 2013Sep 20 2013We study the collapse of rapidly rotating supermassive stars that may have formed in the early Universe. By self-consistently simulating the dynamics from the onset of collapse using three-dimensional general-relativistic hydrodynamics with fully dynamical ... More

Anomalous NMR Spin-Lattice Relaxation in SrB_{6} and Ca_{1-x}La_{x}B_{6}Nov 21 2000Jan 31 2001We report the results of {11}B nuclear magnetic resonance (NMR) measurements of SrB_{6} and Ca_{0.995}La_{0.05}B_{6} below room temperature. Although the electrical resistivities of these two materials differ substantially, their {11}B-NMR responses exhibit ... More

ALMA and VLA observations of emission from the environment of Sgr A*Jun 08 2017We present 44 and 226 GHz observations of the Galactic center within 20$"$ of Sgr A*. Millimeter continuum emission at 226 GHz is detected from eight stars that have previously been identified at near-IR and radio wavelengths. We also detect a 5.8 mJy ... More

Unusual magnetic properties of the low-dimensional quantum magnet Na2V3O7Jan 31 2005We report the results of low-temperature measurements of the specific heat Cp(T), ac susceptibility chi(T) and 23Na nuclear magnetic resonance NMR of Na2V3O7. At liquid He temperatures Cp(T)/T exhibits broad field-dependent maxima, which shift to higher ... More

The Progenitor Dependence of Three-Dimensional Core-Collapse SupernovaeDec 04 2017We present a first study of the progenitor star dependence of the three-dimensional (3D) neutrino mechanism of core-collapse supernovae. We employ full 3D general-relativistic multi-group neutrino radiation-hydrodynamics and simulate the post-bounce evolutions ... More

Correlated Gravitational Wave and Neutrino Signals from General-Relativistic Rapidly Rotating Iron Core CollapseApr 02 2012Mar 25 2013We present results from a new set of 3D general-relativistic hydrodynamic simulations of rotating iron core collapse. We assume octant symmetry and focus on axisymmetric collapse, bounce, the early postbounce evolution, and the associated gravitational ... More

Neutron production induced by $α$-decay with Geant4Jun 10 2019Neutron production induced by ($\alpha$,n) reactions is important in various scenarios. One of the most relevant ones is related to underground dark matter experiments, where the neutrons produced by the $\alpha$-decay from radioactive contaminants in ... More

Nonstationary open dynamical systemsAug 16 2018May 14 2019This paper studies nonstationary open dynamical systems from the statistical viewpoint. By open, we mean that trajectories may escape through holes in the phase space. By nonstationary, we mean that the dynamical model itself (as well as the holes) may ... More

General-Relativistic Simulations of Three-Dimensional Core-Collapse SupernovaeOct 24 2012Mar 25 2013We study the three-dimensional (3D) hydrodynamics of the post-core-bounce phase of the collapse of a 27-solar-mass star and pay special attention to the development of the standing accretion shock instability (SASI) and neutrino-driven convection. To ... More

NMR and dc-susceptibility studies of NaVGe2O6Feb 18 2004Oct 13 2005We report the results of measurements of the dc magnetic susceptibility chi(T) and of the 23Na nuclear magnetic resonance (NMR) response of NaVGe2O6, a material in which the V ions form a network of interacting one-dimensional spin S=1 chains. The experiments ... More

Room-temperature structural phase transition in the quasi-2D spin-1/2 Heisenberg antiferromagnet Cu(pz)$_2$(ClO$_4$)$_2$Apr 29 2019Cu(pz)$_2$(ClO$_4$)$_2$ (with pz denoting pyrazine C$_4$H$_4$N$_2$) is a two-dimensional spin-1/2 square-lattice antiferromagnet with $T_{\mathrm{N}}$ = 4.24 K. Due to a persisting focus on the low-temperature magnetic properties, its room-temperature ... More

Gravitational Waves from Binary Black Hole Mergers Inside of StarsApr 24 2017Sep 19 2017We present results from a controlled numerical experiment investigating the effect of stellar density gas on the coalescence of binary black holes (BBHs) and the resulting gravitational waves (GWs). This investigation is motivated by the proposed stellar ... More

Magnetorotational Core-Collapse Supernovae in Three DimensionsMar 05 2014We present results of new three-dimensional (3D) general-relativistic magnetohydrodynamic simulations of rapidly rotating strongly magnetized core collapse. These simulations are the first of their kind and include a microphysical finite-temperature equation ... More

Asymptotics of even-even correlations in the Ising modelApr 23 2018Nov 26 2018We consider finite-range ferromagnetic Ising models on $\mathbb{Z}^d$ in the regime $\beta<\beta_c$. We analyze the behavior of the prefactor to the exponential decay of $\mathrm{Cov}(\sigma_A,\sigma_B)$, for arbitrary finite sets $A$ and $B$ of even ... More

Black Hole-Neutron Star Mergers with a Hot Nuclear Equation of State: Outflow and Neutrino-Cooled Disk for a Low-Mass, High-Spin CaseApr 11 2013May 02 2016Neutrino emission significantly affects the evolution of the accretion tori formed in black hole-neutron star mergers. It removes energy from the disk, alters its composition, and provides a potential power source for a gamma-ray burst. To study these ... More

Milnor-Wood type inequalities for Higgs bundlesMay 22 2011We explain how the generalized Milnor-Wood inequality of Burger and Iozzi for reductive representations of a cocompact complex-hyperbolic lattice into a Hermitian Lie group translates under Simpson's non-abelian Hodge correspondence into an inequality ... More

Neutron capture cross section measurement of 238U at the n TOF CERN facility with C6D6 scintillation detectors in the energy region from 1 eV to 700 keVDec 01 2016The aim of this work is to provide a precise and accurate measurement of the 238U(n,g) reaction cross section in the energy region from 1 eV to 700 keV. This reaction is of fundamental importance for the design calculations of nuclear reactors, governing ... More

Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesisApr 11 2013The $^{63}$Ni($n, \gamma$) cross section has been measured for the first time at the neutron time-of-flight facility n\_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian ... More

Bounded cohomology via partial differential equations, IOct 17 2013Dec 19 2013We present a new technique that employs partial differential equations in order to explicitly construct primitives in the continuous bounded cohomology of Lie groups. As an application, we prove a vanishing theorem for the continuous bounded cohomology ... More

In situ photoemission study of the room-temperature ferromagnet ZnGeP_2:MnApr 04 2003Apr 11 2003The chemical states of the ZnGeP$_{2}$:Mn interface, which shows ferromagnetism above room-temperature, has been studied by photoemission spectroscopy. Mn deposition on the ZnGeP$_2$ substrate heated to 400$^{\circ}$C induced Mn substitution for Zn and ... More

Post-merger evolution of a neutron star-black hole binary with neutrino transportFeb 13 2015We present a first simulation of the post-merger evolution of a black hole-neutron star binary in full general relativity using an energy-integrated general relativistic truncated moment formalism for neutrino transport. We describe our implementation ... More

The 80 Ms follow-up of the X-ray afterglow of GRB 130427A challenges the standard forward shock modelFeb 12 2016Jun 29 2016GRB 130427A was the brightest gamma-ray burst detected in the last 30 years. With an equivalent isotropic energy output of $8.5\times10^{53}$ erg and redshift $z=0.34$, it uniquely combined very high energetics with a relative proximity to Earth. As a ... More

Electrical half-wave rectification at ferroelectric domain wallsMar 22 2018Ferroelectric domain walls represent multifunctional 2D-elements with great potential for novel device paradigms at the nanoscale. Improper ferroelectrics display particularly promising types of domain walls, which, due to their unique robustness, are ... More

Characterization of a CLYC detector for underground experimentsOct 06 2017Large size detectors based on Cs2LiYCl6:Ce (CLYC) are capable of performing a combined $\gamma$-ray and neutron spectrometry and constitute a promising technology for a wide range of applications in nuclear and high energy physics. Due to their novelty, ... More

A Square Peg in a Round Hole: The Complex Path for Wireless in the Manufacturing IndustryAug 09 2018Feb 01 2019The manufacturing industry is at the edge of the 4th industrial revolution, a paradigm of integrated architectures in which the entire production chain (composed of machines, workers and products) is intrinsically connected. Wireless technologies can ... More

A 2-dimensional Complex Kleinian Group With Infinite Lines in the Limit Set Lying in General PositionMar 01 2010Apr 18 2016In this article we present an example of a discrete group $\Sigma_\C\subset PSL(3,\Bbb{R})$ whose action on $\P^2$ does no have invariant projective subspaces, is not conjugated to complex hyperbolic group and its limit set in the sense of Kulkarni on ... More

The limit set for discrete complex hyperbolic groupsJun 26 2015Jun 14 2016Given a discrete subgroup $\Gamma$ of $PU(1,n)$ it acts by isometries on the unit complex ball $\Bbb{H}^n_{\Bbb{C}}$, in this setting a lot of work has been done in order to understand the action of the group. However when we look at the action of $\Gamma$ ... More

Multi-domain ferroelectricity as a limiting factor for voltage amplification in ferroelectric field-effect transistorsMar 19 2011We revise the possibility of having an amplified surface potential in ferroelectric field-effect transistors pointed out by [S. Salahuddin and S. Datta, Nano Lett. 8, 405 (2008)]. We show that the negative-capacitance regime that allows for such an amplification ... More

A Numerical Relativity Waveform Surrogate Model for Generically Precessing Binary Black Hole MergersMay 19 2017Sep 22 2018A generic, non-eccentric binary black hole (BBH) system emits gravitational waves (GWs) that are completely described by 7 intrinsic parameters: the black hole spin vectors and the ratio of their masses. Simulating a BBH coalescence by solving Einstein's ... More

On the number of crossings in a random labelled tree with vertices in convex positionFeb 14 2019We prove that the number of crossings in a random labelled tree with vertices in convex position is asymptotically Gaussian with mean $ n^2/6$ and variance $ n^3/45$. A similar result is proved for points in general position under mild constraints.

Multifold nodal points in magnetic materialsApr 29 2019We describe the symmetry protected nodal points that can exist in magnetic space groups and show that only 3-, 6-, and 8-fold degeneracies are possible (in addition to the 2- and 4-fold degeneracies that have already been studied.) The 3- and 6-fold degeneracies ... More

Cross section measurements of $^{155,157}$Gd(n,$γ$) induced by thermal and epithermal neutronsMay 10 2018Neutron capture measurements on $^{155}$Gd and $^{157}$Gd were performed using the time-of-flight technique at the n\_TOF facility at CERN. Four samples in form of self-sustaining metallic discs isotopically enriched in $^{155}$Gd and $^{157}$Gd were ... More

Molecular and Atomic Gas in the Large Magellanic Cloud - I. Conditions for CO DetectionFeb 10 2009We analyze the conditions for detection of CO(1-0) emission in the Large Magellanic Cloud (LMC), using the recently completed second NANTEN CO survey. In particular, we investigate correlations between CO integrated intensity and HI integrated intensity, ... More

GRHydro: A new open source general-relativistic magnetohydrodynamics code for the Einstein ToolkitApr 19 2013We present the new general-relativistic magnetohydrodynamics (GRMHD) capabilities of the Einstein Toolkit, an open-source community-driven numerical relativity and computational relativistic astrophysics code. The GRMHD extension of the Toolkit builds ... More

Charmonia production in hadron colliders and the extraction of colour-octet matrix elementsJun 06 1997We present the results of our analysis on charmonia ($J/\psi$ and $\psi'$) hadroproduction taking into account higher-order QCD effects induced by initial-state radiation in a Monte Carlo framework, with the colour-octet mechanism implemented in the event ... More

J/psi Production at the LHCNov 07 1996We firstly examine hadroproduction of prompt J/psi's at the Fermilab Tevatron in a Monte Carlo Framework by means of the event generator PYTHIA 5.7 in which those colour-octet matrix elements processes relevant for charmonium production have been implemented ... More

Manipulation of Quenching in Nanoantenna-Emitter Systems Enabled by External Detuned Cavities: A Path to Enhance Strong-CouplingMay 12 2017Mar 09 2018We show that a broadband Fabry-Perot microcavity can assist an emitter coupled to an off-resonant plasmonic nanoantenna to inhibit the nonradiative channels that affect the quenching of fluorescence. We identify the interference mechanism that creates ... More

Gravitational waveforms for neutron star binaries from binary black hole simulationsSep 18 2015Feb 25 2016Gravitational waves from binary neutron star (BNS) and black hole/neutron star (BHNS) inspirals are primary sources for detection by the Advanced Laser Interferometer Gravitational-Wave Observatory. The tidal forces acting on the neutron stars induce ... More

Measurement of the 235U(n,f) cross section relative to the 6Li(n,t) and 10B(n,alpha) standards from thermal to 170 keV neutron energy range at n_TOFFeb 27 2019Mar 04 2019The 235U(n,f) cross section was measured in a wide energy range at n_TOF relative to 6Li(n,t) and 10B(n,alpha), with high resolution and in a wide energy range, with a setup based on a stack of six samples and six silicon detectors placed in the neutron ... More

Broad-lined type Ic supernova iPTF16asu: A challenge to all popular modelsDec 20 2017Sep 18 2018iPTF16asu is a peculiar broad-lined type Ic supernova (SN) discovered by the intermediate Palomar Transient Factory. With a rest-frame rise time of only 4 days, iPTF16asu challenges the existing popular models, for example, the radioactive heating (56Ni-only) ... More

Measurement and analysis of the Am-243 neutron capture cross section at the n_TOF facility at CERNDec 04 2014Background:The design of new nuclear reactors and transmutation devices requires to reduce the present neutron cross section uncertainties of minor actinides. Purpose: Reduce the $^{243}$Am(n,$\gamma$) cross section uncertainty. Method: The $^{243}$Am(n,$\gamma$) ... More

One-sided shift spaces over infinite alphabetsSep 08 2012Jul 02 2013We define a notion of (one-sided) shift spaces over infinite alphabets. Unlike many previous approaches to shift spaces over countable alphabets, our shift spaces are compact Hausdorff spaces. We examine shift morphisms between these shift spaces, and ... More

Fractal Dimension of Higher-Dimensional Chaotic RepellorsMar 06 2000Using examples we test formulae previously conjectured to give the fractal information dimension of chaotic repellors and their stable and unstable manifolds in ``typical'' dynamical systems in terms of the Lyapunov exponents and the characteristic escape ... More

Massive Computation for Understanding Core-Collapse Supernova ExplosionsAug 29 2016How do massive stars explode? Progress toward the answer is driven by increases in compute power. Petascale supercomputers are enabling detailed three-dimensional simulations of core-collapse supernovae. These are elucidating the role of fluid instabilities, ... More

Probing the Core-Collapse Supernova Mechanism with Gravitational WavesMay 18 2009The mechanism of core-collapse supernova explosions must draw on the energy provided by gravitational collapse and transfer the necessary fraction to the kinetic and internal energy of the ejecta. Despite many decades of concerted theoretical effort, ... More

The Gravitational Wave Signature of Core-Collapse SupernovaeSep 03 2008Jan 11 2009We review the ensemble of anticipated gravitational-wave (GW) emission processes in stellar core collapse and postbounce core-collapse supernova evolution. We discuss recent progress in the modeling of these processes and summarize most recent GW signal ... More

Raman spectroscopy of graphene under ultrafast laser excitationApr 01 2017Feb 14 2018The equilibrium optical phonons of graphene are well characterized in terms of anharmonicity and electron-phonon interactions, however their non-equilibrium properties in the presence of hot charge carriers are still not fully explored. Here we study ... More

The luminous, massive and solar metallicity galaxy hosting the Swift gamma-ray burst, GRB 160804A at z = 0.737Nov 07 2017We here present the spectroscopic follow-up observations with VLT/X-shooter of the Swift long-duration gamma-ray burst GRB 160804A at z = 0.737. Typically, GRBs are found in low-mass, metal-poor galaxies which constitute the sub-luminous population of ... More

GRB 161219B / SN 2016jca: A low-redshift gamma-ray burst supernova powered by radioactive heatingApr 18 2017Apr 20 2017Since the first discovery of a broad-lined type Ic supernova (SN) with a long-duration gamma-ray burst (GRB) in 1998, fewer than fifty gamma-ray burst supernovae (GRB-SNe) have been discovered. The intermediate-luminosity Swift GRB 161219B and its associated ... More

Bayesian optimisation under uncertain inputsFeb 21 2019Bayesian optimisation (BO) has been a successful approach to optimise functions which are expensive to evaluate and whose observations are noisy. Classical BO algorithms, however, do not account for errors about the location where observations are taken, ... More

Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductorMay 12 2019We report a comprehensive study of the noncentrosymmetric superconductor Mo$_3$P. Its bulk superconductivity, with $T_c = 5.5$ K, was characterized via electrical resistivity, magnetization, and heat-capacity measurements, while its microscopic electronic ... More

OB Stars in the Solar Neighborhood I: Analysis of their Spatial DistributionFeb 22 2006We present a newly-developed, three-dimensional spatial classification method, designed to analyze the spatial distribution of early type stars within the 1 kpc sphere around the Sun. We propose a distribution model formed by two intersecting disks -the ... More

Distance Determinations to SHIELD Galaxies from HST ImagingFeb 15 2014The Survey of HI in Extremely Low-mass Dwarf galaxies (SHIELD) is an on-going multi-wavelength program to characterize the gas, star formation, and evolution in gas-rich, very low-mass galaxies. The galaxies were selected from the first ~10% of the HI ... More

Attractor Reconstruction by Machine LearningMay 09 2018Jun 18 2018A machine-learning approach called "reservoir computing" has been used successfully for short-term prediction and attractor reconstruction of chaotic dynamical systems from time series data. We present a theoretical framework that describes conditions ... More

Forming Super Star Clusters in the Central Starburst of NGC 253Apr 05 2018Oct 24 2018NGC 253 hosts the nearest nuclear starburst. Previous observations show a region rich in molecular gas, with dense clouds associated with recent star formation. We used ALMA to image the 350 GHz dust continuum and molecular line emission from this region ... More

Graphene Overcoats for Ultra-High Storage Density Magnetic MediaJun 02 2019Hard disk drives (HDDs) are used as secondary storage in a number of digital electronic devices owing to low cost ($<$0.1\$/GB at 2016 prices) and large data storage capacity (10TB with a 3.5 inch HDD). Due to the exponentially increasing amount of data, ... More

Stability analysis of sonic horizons in Bose-Einstein condensatesMar 22 2006We examine the linear stability of various configurations in Bose-Einstein condensates with sonic horizons. These configurations are chosen in analogy with gravitational systems with a black hole horizon, a white hole horizon and a combination of both. ... More

Interplay of magnetic and structural transitions in Fe-based pnictide superconductorsApr 23 2010May 05 2010The interplay between the structural and magnetic phase transitions occurring in the Fe-based pnictide superconductors is studied within a Ginzburg-Landau approach. We show that the magnetoelastic coupling between the corresponding order parameters is ... More

Chiral emission into nanophotonic resonatorsJun 04 2018Chiral emission, where the handedness of a transition dipole determines the direction in which a photon is emitted, has recently been observed from atoms and quantum dots coupled to nanophotonic waveguides. Here, we consider the case of chiral light-matter ... More

Testing the gravitational theory with short-period stars around our Galactic CenterMay 30 2017Motion of short-period stars orbiting the supermassive black hole in our Galactic Center has been monitored for more than 20 years. These observations are currently offering a new way to test the gravitational theory in an unexplored regime: in a strong ... More

Memory loss for time-dependent dynamical systemsSep 29 2012This paper discusses the evolution of probability distributions for certain time-dependent dynamical systems. Exponential loss of memory is proved for expanding maps and for one-dimensional piecewise expanding maps with slowly varying parameters.

The mixed problem for the Lamé system in two dimensionsNov 15 2012We consider the mixed problem for $L$ the Lam\'e system of elasticity in a bounded Lipschitz domain $ \Omega\subset\reals ^2$. We suppose that the boundary is written as the union of two disjoint sets, $\partial\Omega =D\cup N$. We take traction data ... More

Semialgebraic decomposition of real binary forms of a given degree's spaceJun 13 2017Jul 09 2018The Waring Problem over polynomial rings asks for how to decompose an homogeneous polynomial of degree $d$ as a finite sum of $d^{th}$ powers of linear forms. First, we give a constructive method to obtain a real Waring decomposition of any given real ... More

Topological structures are consistently overestimated in functional complex networksMar 13 2018Functional complex networks have meant a pivotal change in the way we understand complex systems, being the most outstanding one the human brain. These networks have classically been reconstructed using a frequentist approach that, while simple, completely ... More

Parabolic curves for diffeomorphisms in (C^2,0)Nov 01 2006We give a simple proof of existence of parabolic curves for tangent to the identity diffeomorphisms in (C^2,0) with isolated fixed point.

Exact calculation of the number of degrees of freedom of a rigid body constituted by n particlesFeb 10 2010In this work we discuss how to correctly obtain the number of degrees of freedom of a system constituted by n particles with fixed relative distances and which are immerse in a three-dimensional space. As a result of our analysis, we develop expressions ... More

Simple Online and Realtime TrackingFeb 02 2016Jul 07 2017This paper explores a pragmatic approach to multiple object tracking where the main focus is to associate objects efficiently for online and realtime applications. To this end, detection quality is identified as a key factor influencing tracking performance, ... More

Molecular gas kinematics within the central 250 pc of the Milky WayJan 14 2016Feb 10 2016Using spectral-line observations of HNCO, N2H+, and HNC, we investigate the kinematics of dense gas in the central ~250 pc of the Galaxy. We present SCOUSE (Semi-automated multi-COmponent Universal Spectral-line fitting Engine), a line fitting algorithm ... More

Discovery of the broad-lined Type Ic SN 2013cq associated with the very energetic GRB 130427AMay 29 2013Aug 20 2013Long-duration gamma-ray bursts (GRBs) at z < 1 are in most cases found to be accompanied by bright, broad-lined Type Ic supernovae (SNe Ic-BL). The highest-energy GRBs are mostly located at higher redshifts, where the associated SNe are hard to detect ... More

Reed-Solomon Codes over Fields of Characteristic ZeroJan 21 2019Apr 12 2019We study Reed--Solomon codes over arbitrary fields, inspired by several recent papers dealing with Gabidulin codes over fields of characteristic zero. Over the field of rational numbers, we derive bounds on the coefficient growth during encoding and the ... More

A New Mechanism for Core-Collapse Supernova ExplosionsOct 24 2005Nov 28 2005We present a new mechanism for core-collapse supernova explosions that relies upon acoustic power generated in the inner core as the driver. In our simulation using an 11-solar-mass progenitor, a strong advective-acoustic oscillation a la Foglizzo with ... More

The Green function for the mixed problem for the linear Stokes system in domains in the planeOct 08 2013We construct the Green function for the mixed boundary value problem for the linear Stokes system in a two-dimensional Lipschitz domain.

Coarse-grained strain dynamics and backwards/forwards dispersionOct 19 2006A Particle Tracking Velocimetry experiment has been performed in a turbulent flow at intermediate Reynolds number. We present experimentally obtained stretching rates for particle pairs in the inertial range. When compensated by a characteristic time ... More

The Molecular Disk of the Elliptical Galaxy NGC 5128 (Centaurus A): I. Star Formation Efficiencies at Giant Molecular Cloud ScalesJun 04 2019We present ALMA CO(1-0) observations toward the dust lane of the nearest elliptical and radio galaxy, NGC 5128 (Centaurus A), with high angular resolution ($\sim$ 1 arcsec, or 18 pc), including information from large to small spatial scales and total ... More

Higher harmonics of the magnetoplasmon in strongly coupled Coulomb and Yukawa systemsDec 10 2010The generation of higher harmonics of the magnetoplasmon frequency which has recently been reported in strongly coupled two-dimensional Yukawa systems is investigated in detail and, in addition, extended to two-dimensional Coulomb systems. We observe ... More

Nonlinear magnetoplasmons in strongly coupled Yukawa plasmasMar 13 2010The existence of plasma oscillations at multiples of the magnetoplasmon frequency in a strongly coupled two-dimensional magnetized Yukawa plasma is reported, based on extensive molecular dynamics simulations. These modes are the analogues of Bernstein ... More

A scale-free method for testing the proportionality of branch lengths between two phylogenetic treesMar 13 2015We introduce a scale-free method for testing the proportionality of branch lengths between two phylogenetic trees that have the same topology and contain the same set of taxa. This method scales both trees to a total length of 1 and sums up the differences ... More

Bayesian Optimisation for Safe Navigation under Localisation UncertaintySep 07 2017Feb 17 2018In outdoor environments, mobile robots are required to navigate through terrain with varying characteristics, some of which might significantly affect the integrity of the platform. Ideally, the robot should be able to identify areas that are safe for ... More

Deformation of the N=Z nucleus 76Sr using beta-decay studiesFeb 03 2004Apr 26 2004A novel method of deducing the deformation of the N=Z nucleus 76Sr is presented. It is based on the comparison of the experimental Gamow-Teller strength distribution B(GT) from its beta decay with the results of QRPA calculations. This method confirms ... More

Negative differential conductivity in an interacting quantum gasNov 20 2014Negative differential conductivity (NDC) is a widely exploited effect in modern electronic components. Here, a proof-of-principle is given for the observation of NDC in a quantum transport device for neutral atoms employing a multi-mode tunneling junction. ... More

Mixture Models for Diverse Machine Translation: Tricks of the TradeFeb 20 2019May 24 2019Mixture models trained via EM are among the simplest, most widely used and well understood latent variable models in the machine learning literature. Surprisingly, these models have been hardly explored in text generation applications such as machine ... More

The mixed problem in Lipschitz domains with general decompositions of the boundaryNov 07 2011This paper continues the study of the mixed problem for the Laplacian. We consider a bounded Lipschitz domain $\Omega\subset \reals^n$, $n\geq2$, with boundary that is decomposed as $\partial\Omega=D\cup N$, $D$ and $N$ disjoint. We let $\Lambda$ denote ... More