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2016-06-27 | Five Planets Transiting a Ninth Magnitude Star | The Kepler mission has revealed a great diversity of planetary systems and
architectures, but most of the planets discovered by Kepler orbit faint stars.
Using new data from the K2 mission, we present the discovery of a five planet
system transiting a bright (V = 8.9, K = 7.7) star called HIP 41378. HIP 41378
is a slig... | 1606.08441v1 |
2016-07-06 | Holographic Beam Mapping of the CHIME Pathfinder Array | The Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder radio
telescope is currently surveying the northern hemisphere between 400 and 800
MHz. By mapping the large scale structure of neutral hydrogen through its
redshifted 21 cm line emission between $z \sim 0.8-2.5$ CHIME will contribute
to our understa... | 1607.01473v1 |
2016-07-21 | Long-Term Photometry of IC 348 with the YETI Network | We present long-term photometric observations of the young open cluster IC
348 with a baseline time-scale of 2.4 yr. Our study was conducted with several
telescopes from the Young Exoplanet Transit Initiative (YETI) network in the
Bessel $R$ band to find periodic variability of young stars. We identified 87
stars in IC... | 1607.06322v1 |
2016-08-02 | Atomic-scale observation and manipulation of plaquette antiferromagnetic order in iron-based superconductor | The symmetry requirement and the origin of magnetic orders coexisting with
superconductivity have been strongly debated issues of iron-based
superconductors (FeSCs). Observation of C$_4$-symmetric antiferromagnetism in
violation of the inter-band nesting condition of spin-density waves in
superconducting ground state w... | 1608.00884v3 |
2016-08-10 | POLARBEAR-2: an instrument for CMB polarization measurements | POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization
experiment that will be located in the Atacama highland in Chile at an altitude
of 5200 m. Its science goals are to measure the CMB polarization signals
originating from both primordial gravitational waves and weak lensing. PB-2 is
designed to measu... | 1608.03025v1 |
2016-08-15 | ICE-based Custom Full-Mesh Network for the CHIME High Bandwidth Radio Astronomy Correlator | New generation radio interferometers encode signals from thousands of antenna
feeds across large bandwidth. Channelizing and correlating this data requires
networking capabilities that can handle unprecedented data rates with
reasonable cost. The Canadian Hydrogen Intensity Mapping Experiment (CHIME)
correlator process... | 1608.04347v1 |
2016-08-22 | ICE: a scalable, low-cost FPGA-based telescope signal processing and networking system | We present an overview of the 'ICE' hardware and software framework that
implements large arrays of interconnected FPGA-based data acquisition, signal
processing and networking nodes economically. The system was conceived for
application to radio, millimeter and sub-millimeter telescope readout systems
that have requir... | 1608.06262v1 |
2016-09-14 | Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run | The determination of exoplanet properties and occurrence rates using Kepler
data critically depends on our knowledge of the fundamental properties (such as
temperature, radius and mass) of the observed stars. We present revised stellar
properties for 197,096 Kepler targets observed between Quarters 1-17 (Q1-17),
which ... | 1609.04128v2 |
2016-11-16 | Low Barrier Nanomagnets as p-bits for Spin Logic | It has recently been shown that a suitably interconnected network of tunable
telegraphic noise generators or "p-bits" can be used to perform even precise
arithmetic functions like a 32-bit adder. In this paper we use simulations
based on the stochastic Landau-Lifshitz-Gilbert (sLLG) equation to demonstrate
that similar... | 1611.05477v3 |
2016-11-19 | Slow links, fast links, and the cost of gossip | Consider the classical problem of information dissemination: one (or more)
nodes in a network have some information that they want to distribute to the
remainder of the network. In this paper, we study the cost of information
dissemination in networks where edges have latencies, i.e., sending a message
from one node to... | 1611.06343v4 |
2016-12-22 | Eroding dipoles and vorticity growth for Euler flows in $ \scriptstyle{\mathbb{R}}^3$: The hairpin geometry as a model for finite-time blowup | A theory of an eroding "hairpin" vortex dipole structure in three dimensions
is developed, extending our previous study of an axisymmetric eroding dipole
without swirl. The hairpin is here similarly proposed as a model to produce
large "self-stretching" of vorticity, with the possibility of finite-time
blow-up. We deri... | 1612.07709v2 |
2017-06-22 | Efficiency of magnetic hyperthermia in the presence of rotating and static fields | Single-domain ferromagnetic nanoparticle systems can be used to transfer
energy from a time-dependent magnetic field into their environment. This local
heat generation, i.e., magnetic hyperthermia, receives applications in cancer
therapy which requires the enhancement of the energy loss. A possible way to
improve the e... | 1706.07426v4 |
2017-07-05 | Measuring Reionization, Neutrino Mass, and Cosmic Inflation with BFORE | BFORE is a NASA high-altitude ultra-long-duration balloon mission proposed to
measure the cosmic microwave background (CMB) across half the sky during a
28-day mid-latitude flight launched from Wanaka, New Zealand. With the unique
access to large angular scales and high frequencies provided by the balloon
platform, BFO... | 1707.01488v1 |
2017-08-28 | Three statistically validated K2 transiting warm Jupiter exoplanets confirmed as low-mass stars | We have identified three K2 transiting star-planet systems, K2-51 (EPIC
202900527), K2-67 (EPIC 206155547), and K2-76 (EPIC 206432863), as stellar
binaries with low-mass stellar secondaries. The three systems were
statistically validated as transiting planets, and through measuring their
orbits by radial velocity monit... | 1708.08455v2 |
2017-09-29 | Zodiacal Exoplanets in Time (ZEIT) VI: a three-planet system in the Hyades cluster including an Earth-sized planet | Planets in young clusters are powerful probes of the evolution of planetary
systems. Here we report the discovery of three planets transiting K2-136 (EPIC
247589423), a late K dwarf in the Hyades (~800 Myr) cluster, and robust
detection limits for additional planets in the system. The planets were
identified from their... | 1709.10328v2 |
2017-12-11 | Stellar Stream and Halo Structure in the Andromeda Galaxy From a Subaru/Hyper Suprime-Cam Survey | We present wide and deep photometry of the northwest part of the halo of the
Andromeda galaxy (M31) using Hyper Suprime-Cam on the Subaru Telescope. The
survey covers 9.2 deg$^{2}$ field in the $g$, $i$, and $NB515$ bands and shows
a clear red giant branch (RGB) of M31's halo stars and a pronounced red clump
(RC) featu... | 1712.03654v1 |
2018-02-15 | Spin and charge pumping by steady or pulse current-driven magnetic domain wall: A self-consistent multiscale time-dependent-quantum/time-dependent-classical approach | We introduce a multiscale framework which combines time-dependent
nonequilibrium Green function (TD-NEGF) algorithms, scaling linearly in the
number of time steps and describing quantum-mechanically conduction electrons
in the presence of time-dependent fields of arbitrary strength or frequency,
with classical time evo... | 1802.05682v3 |
2018-03-21 | Constraints for the Progenitor Masses of Historic Core-Collapse Supernovae | We age-date the stellar populations associated with 12 historic nearby
core-collapse supernovae (CCSNe) and 2 supernova impostors, and from these
ages, we infer their initial masses and associated uncertainties. To do this,
we have obtained new HST imaging covering these CCSNe. Using these images, we
measure resolved s... | 1803.08112v1 |
2018-03-29 | The CHIME Fast Radio Burst Project: System Overview | The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a novel transit
radio telescope operating across the 400-800-MHz band. CHIME is comprised of
four 20-m x 100-m semi-cylindrical paraboloid reflectors, each of which has 256
dual-polarization feeds suspended along its axis, giving it a >200 square
degree fiel... | 1803.11235v1 |
2018-05-15 | Parallel Working-Set Search Structures | In this paper we present two versions of a parallel working-set map on p
processors that supports searches, insertions and deletions. In both versions,
the total work of all operations when the map has size at least p is bounded by
the working-set bound, i.e., the cost of an item depends on how recently it was
accessed... | 1805.05787v3 |
2018-05-28 | Zodiacal Exoplanets in Time (ZEIT) VII: A Temperate Candidate Super-Earth in the Hyades Cluster | Transiting exoplanets in young open clusters present opportunities to study
how exoplanets evolve over their lifetimes. Recently, significant progress
detecting transiting planets in young open clusters has been made with the K2
mission, but so far all of these transiting cluster planets orbit close to
their host stars... | 1805.11117v1 |
2018-06-07 | Discovery of a Candidate Black Hole - Giant Star Binary System in the Galactic Field | We report the discovery of the first likely black hole in a non-interacting
binary system with a field red giant. By combining radial velocity measurements
from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) with
photometric variability data from the All-Sky Automated Survey for Supernovae
(ASAS-SN... | 1806.02751v2 |
2018-06-08 | A TESS Dress Rehearsal: Planetary Candidates and Variables from K2 Campaign 17 | We produce light curves for all ~34,000 targets observed with K2 in Campaign
17 (C17), identifying 34 planet candidates, 184 eclipsing binaries, and 222
other periodic variables. The location of the C17 field means follow-up can
begin immediately now that the campaign has concluded and interesting targets
have been ide... | 1806.03127v1 |
2018-08-31 | Design and characterization of the SPT-3G receiver | The SPT-3G receiver was commissioned in early 2017 on the 10-meter South Pole
Telescope (SPT) to map anisotropies in the cosmic microwave background (CMB).
New optics, detector, and readout technologies have yielded a multichroic,
high-resolution, low-noise camera with impressive throughput and sensitivity,
offering th... | 1809.00032v1 |
2018-10-02 | Project AMIGA: Distance and Metallicity Gradients Along Andromeda's Giant Southern Stream from the Red Clump | The Giant Southern Stream (GSS) of M31, a keystone signature of a major
accretion event, yields crucial constraints on M31 formation and evolution
models. Currently, our understanding of the GSS, in terms of both its geometry
and its chemistry, results from either wide-field imaging probing only a few
magnitudes below ... | 1810.01525v1 |
2018-10-30 | MAMMO: A Deep Learning Solution for Facilitating Radiologist-Machine Collaboration in Breast Cancer Diagnosis | With an aging and growing population, the number of women requiring either
screening or symptomatic mammograms is increasing. To reduce the number of
mammograms that need to be read by a radiologist while keeping the diagnostic
accuracy the same or better than current clinical practice, we develop Man and
Machine Mammo... | 1811.02661v1 |
2018-11-22 | Elemental Abundances in M31: Alpha and Iron Element Abundances from Low-Resolution Resolved Stellar Spectroscopy in the Stellar Halo | Measurements of [Fe/H] and [$\alpha$/Fe] can probe the minor merging history
of a galaxy, providing a direct way to test the hierarchical assembly paradigm.
While measurements of [$\alpha$/Fe] have been made in the stellar halo of the
Milky Way, little is known about detailed chemical abundances in the stellar
halo of ... | 1811.09279v2 |
2018-12-14 | $ε^\prime/ε$-2018: A Christmas Story | I was supposed to review the status of $\epsilon^\prime/\epsilon$ both at the
CKM Workshop in September in Heidelberg and recently at the Discrete 2018
Conference in Vienna. Unfortunately I had to cancel both talks for family
reasons. My main goal in these talks was to congratulate NA48 and KTeV
collaborations for the ... | 1812.06102v2 |
2018-12-20 | Single-spin qubits in isotopically enriched silicon at low magnetic field | Single-electron spin qubits employ magnetic fields on the order of 1 Tesla or
above to enable quantum state readout via spin-dependent-tunnelling. This
requires demanding microwave engineering for coherent spin resonance control
and significant on-chip real estate for electron reservoirs, both of which
limit the prospe... | 1812.08347v5 |
2019-01-17 | Lithium-loaded Liquid Scintillator Production for the PROSPECT experiment | This work reports the production and characterization of lithium-loaded
liquid scintillator (LiLS) for the Precision Reactor Oscillation and Spectrum
Experiment (PROSPECT). Fifty-nine 90 liter batches of LiLS (${}^6{\rm Li}$ mass
fraction 0.082%$\pm$0.001%) were produced and samples from all batches were
characterized ... | 1901.05569v2 |
2019-01-31 | Spirit: Multifunctional Framework for Atomistic Spin Simulations | The \textit{Spirit} framework is designed for atomic scale spin simulations
of magnetic systems of arbitrary geometry and magnetic structure, providing a
graphical user interface with powerful visualizations and an easy to use
scripting interface. An extended Heisenberg type spin-lattice Hamiltonian
including competing... | 1901.11350v1 |
2019-02-24 | Latency, Capacity, and Distributed MST | We study the cost of distributed MST construction in the setting where each
edge has a latency and a capacity, along with the weight. Edge latencies
capture the delay on the links of the communication network, while capacity
captures their throughput (in this case, the rate at which messages can be
sent). Depending on ... | 1902.08979v2 |
2019-03-20 | Qatar Exoplanet Survey: Qatar-8b, 9b and 10b --- A Hot Saturn and Two Hot Jupiters | In this paper we present three new extrasolar planets from the Qatar
Exoplanet Survey (QES). Qatar-8b is a hot Saturn, with Mpl = 0.37 Mjup and Rpl
= 1.3 Rjup, orbiting a solar-like star every Porb = 3.7 days. Qatar-9b is a hot
Jupiter with a mass of Mpl = 1.2 Mjup and a radius of Rpl = 1 Rjup, in a Porb =
1.5 days orb... | 1903.09258v4 |
2019-03-25 | Identifying Exoplanets with Deep Learning II: Two New Super-Earths Uncovered by a Neural Network in K2 Data | For years, scientists have used data from NASA's Kepler Space Telescope to
look for and discover thousands of transiting exoplanets. In its extended K2
mission, Kepler observed stars in various regions of sky all across the
ecliptic plane, and therefore in different galactic environments. Astronomers
want to learn how ... | 1903.10507v1 |
2019-04-23 | Spin injection and pumping generated by a direct current flowing through a magnetic tunnel junction | A charge flow through a magnetic tunnel junction (MTJ) leads to the
generation of a spin-polarized current which exerts a spin-transfer torque
(STT) on the magnetization. When the density of applied direct current exceeds
some critical value, the STT excites high-frequency magnetization precession in
the "free" electro... | 1904.10361v1 |
2019-04-26 | TOI-216b and TOI-216c: Two warm, large exoplanets in or slightly wide of the 2:1 orbital resonance | Warm, large exoplanets with 10-100 day orbital periods pose a major challenge
to our understanding of how planetary systems form and evolve. Although high
eccentricity tidal migration has been invoked to explain their proximity to
their host stars, a handful reside in or near orbital resonance with nearby
planets, sugg... | 1904.11852v1 |
2019-04-28 | Periodic Bandits and Wireless Network Selection | Bandit-style algorithms have been studied extensively in stochastic and
adversarial settings. Such algorithms have been shown to be useful in
multiplayer settings, e.g. to solve the wireless network selection problem,
which can be formulated as an adversarial bandit problem. A leading bandit
algorithm for the adversari... | 1904.12355v1 |
2019-04-30 | An Inpainting Approach to Tackle the Kinematic and Thermal SZ Induced Biases in CMB-Cluster Lensing Estimators | A galaxy cluster's own Sunyaev-Zel{'}dovich (SZ) signal is known to be a
major contaminant when reconstructing the cluster's underlying lensing
potential using cosmic microwave background (CMB) temperature maps. In this
work, we develop a modified quadratic estimator (QE) that is designed to
mitigate the lensing biases... | 1904.13392v2 |
2019-05-31 | Balancing spreads of influence in a social network | The personalization of our news consumption on social media has a tendency to
reinforce our pre-existing beliefs instead of balancing our opinions. This
finding is a concern for the health of our democracies which rely on an access
to information providing diverse viewpoints. To tackle this issue from a
computational p... | 1906.00074v1 |
2019-06-17 | The Radioactive Source Calibration System of the PROSPECT Reactor Antineutrino Detector | The Precision Reactor Oscillation and Spectrum (PROSPECT) Experiment is a
reactor neutrino experiment designed to search for sterile neutrinos with a
mass on the order of 1 eV/c$^2$ and to measure the spectrum of electron
antineutrinos from a highly-enriched $^{235}$U nuclear reactor. The PROSPECT
detector consists of ... | 1906.07244v2 |
2019-07-17 | Topical Review on Skyrmions and Hall Transport | We review recent progresses towards an understanding of the Skyrmion Hall
transport in insulating as well as conducting materials. First, we consider a
theoretical breakthrough based on the quantum field theory Ward identity, a
first principle analysis, relying on symmetries and conservation laws. Broken
parity (invers... | 1907.07696v1 |
2019-07-29 | Research and Development for HI Intensity Mapping | Development of the hardware, data analysis, and simulation techniques for
large compact radio arrays dedicated to mapping the 21 cm line of neutral
hydrogen gas has proven to be more difficult than imagined twenty years ago
when such telescopes were first proposed. Despite tremendous technical and
methodological advanc... | 1907.13090v1 |
2019-07-03 | Deep Learning Based Energy Disaggregation and On/Off Detection of Household Appliances | Energy disaggregation, a.k.a. Non-Intrusive Load Monitoring, aims to separate
the energy consumption of individual appliances from the readings of a mains
power meter measuring the total energy consumption of, e.g. a whole house.
Energy consumption of individual appliances can be useful in many applications,
e.g., prov... | 1908.00941v2 |
2019-08-07 | Parallel Finger Search Structures | In this paper we present two versions of a parallel finger structure FS on p
processors that supports searches, insertions and deletions, and has a finger
at each end. This is to our knowledge the first implementation of a parallel
search structure that is work-optimal with respect to the finger bound and yet
has very ... | 1908.02741v4 |
2019-08-12 | Percolation phase transitions for the SIR model with random powers | This thesis considers three models which describe a multihop ad-hoc
telecommunication system. These systems consist of users sending messages,
which can jump to other users to reach the target user. The first two models
have already been examined extensively, whereas it is the first time the third
model is studied. In ... | 1908.07375v1 |
2019-08-30 | Elemental Abundances in M31: A Comparative Analysis of Iron and Alpha Element Abundances in the Outer Disk, Giant Stellar Stream, and Inner Halo of M31 | We measured [Fe/H] and [$\alpha$/Fe] using spectral synthesis of
low-resolution stellar spectroscopy for 70 individual red giant branch stars
across four fields spanning the outer disk, Giant Stellar Stream (GSS), and
inner halo of M31. Fields at M31-centric projected distances of 23 kpc in the
halo, 12 kpc in the halo... | 1909.00006v2 |
2019-09-25 | Deep Learning for RF Signal Classification in Unknown and Dynamic Spectrum Environments | Dynamic spectrum access (DSA) benefits from detection and classification of
interference sources including in-network users, out-network users, and jammers
that may all coexist in a wireless network. We present a deep learning based
signal (modulation) classification solution in a realistic wireless network
setting, wh... | 1909.11800v1 |
2019-09-30 | First-principles theory of proximity spin-orbit torque on a two-dimensional magnet: Current-driven antiferromagnet-to-ferromagnet reversible transition in bilayer CrI$_3$ | The recently discovered two-dimensional (2D) magnetic insulator CrI$_3$ is an
intriguing case for basic research and spintronic applications since it is a
ferromagnet in the bulk, but an antiferromagnet in bilayer form, with its
magnetic ordering amenable to external manipulations. Using first-principles
quantum transp... | 1909.13876v2 |
2019-10-14 | An Extreme-mass Ratio, Short-period Eclipsing Binary Consisting of a B Dwarf Primary and a Pre-main Sequence M Star Companion Discovered by KELT | We present the discovery of \thisstar\ (HD 58730), a very low mass ratio ($q
\equiv M_2/M_1 \approx 0.07$) eclipsing binary (EB) identified by the
Kilodegree Extremely Little Telescope (KELT) survey. We present the discovery
light curve and perform a global analysis of four high-precision ground-based
light curves, the... | 1910.06212v2 |
2019-10-28 | A detailed study of Andromeda XIX, an extreme local analogue of ultra diffuse galaxies | With a central surface brightness of $\mu_0=29.3$ mag. per sq. arcsec, and
half-light radius of $r_{\rm half}=3.1^{+0.9}_{-1.1}$~kpc, Andromeda XIX (And
XIX) is an extremely diffuse satellite of Andromeda. We present spectra for
$\sim100$ red giant branch stars in this galaxy, plus 16 stars in a nearby
stellar stream. ... | 1910.12879v2 |
2019-10-28 | Added Value of Intraoperative Data for Predicting Postoperative Complications: Development and Validation of a MySurgeryRisk Extension | To test the hypothesis that accuracy, discrimination, and precision in
predicting postoperative complications improve when using both preoperative and
intraoperative data input features versus preoperative data alone. Models that
predict postoperative complications often ignore important intraoperative
physiological ch... | 1910.12895v2 |
2019-12-04 | Elemental Abundances in M31: The Kinematics and Chemical Evolution of Dwarf Spheroidal Satellite Galaxies | We present deep spectroscopy from Keck/DEIMOS of Andromeda I, III, V, VII,
and X, all of which are dwarf spheroidal satellites of M31. The sample includes
256 spectroscopic members across all five dSphs. We confirm previous
measurements of the velocity dispersions and dynamical masses, and we provide
upper limits on bu... | 1912.02186v1 |
2020-01-03 | The First Habitable Zone Earth-sized Planet from TESS. III: Climate States and Characterization Prospects for TOI-700 d | We present self-consistent three-dimensional climate simulations of possible
habitable states for the newly discovered Habitable Zone Earth-sized planet,
TOI-700 d. We explore a variety of atmospheric compositions, pressures, and
rotation states for both ocean-covered and completely desiccated planets in
order to asses... | 2001.00955v2 |
2020-01-07 | X-ray Observations of the Peculiar Cepheid V473 Lyr Identify A Low-Mass Companion | V473 Lyr is a classical Cepheid which is unique in having substantial
amplitude variations with a period of approximately 3.3 years, thought to be
similar to the Blazhko variations in RR Lyrae stars. We obtained an {\it
XMM-Newton} observation of this star to followup a previous detection in
X-rays. Rather than the X-r... | 2001.02253v1 |
2020-02-11 | Spintronics meets density matrix renormalization group: Quantum spin torque driven nonclassical magnetization reversal and dynamical buildup of long-range entanglement | We introduce time-dependent density matrix renormalization group (tDMRG) as a
solution to long standing problem in spintronics -- how to describe
spin-transfer torque (STT) between flowing spins of conduction electrons and
localized spins within a magnetic material by treating the dynamics of both
spin species fully qu... | 2002.04655v4 |
2020-02-27 | Les Houches 2019 Physics at TeV Colliders: New Physics Working Group Report | This report presents the activities of the `New Physics' working group for
the `Physics at TeV Colliders' workshop (Les Houches, France, 10--28 June,
2019). These activities include studies of direct searches for new physics,
approaches to exploit published data to constrain new physics, as well as the
development of t... | 2002.12220v1 |
2020-03-19 | Realizing an Isotropically Coercive Magnetic Layer for Memristive Applications by Analogy to Dry Friction | We investigate the possibility of realizing a spintronic memristive device
based on the dependence of the tunnel conductance on the relative angle between
the magnetization of the two magnetic electrodes in in-plane magnetized tunnel
junctions. For this, it is necessary to design a free layer whose magnetization
can be... | 2003.08850v1 |
2020-04-07 | Elemental abundances in M31: [Fe/H] and [α/Fe] in M31 Dwarf Galaxies Using Coadded Spectra | We present chemical abundances of red giant branch (RGB) stars in the dwarf
spheroidal (dSph) satellite system of Andromeda (M31), using spectral synthesis
of medium resolution (R $\sim 6000$) spectra obtained with the Keck II
telescope and DEIMOS spectrograph via the Spectroscopic and Photometric
Landscape of Andromed... | 2004.03425v1 |
2020-04-15 | Toward Trustworthy AI Development: Mechanisms for Supporting Verifiable Claims | With the recent wave of progress in artificial intelligence (AI) has come a
growing awareness of the large-scale impacts of AI systems, and recognition
that existing regulations and norms in industry and academia are insufficient
to ensure responsible AI development. In order for AI developers to earn trust
from system... | 2004.07213v2 |
2020-04-22 | Impurity-dependent gyrotropic motion, deflection and pinning of current-driven ultrasmall skyrmions in PdFe/Ir(111) surface | Resting on multi-scale modelling simulations, we explore dynamical aspects
characterizing skyrmions driven by spin-transfer-torque towards repulsive and
pinning 3d and 4d single atomic defects embedded in a Pd layer deposited on the
Fe/Ir(111) surface. The latter is known to host sub-10 nm skyrmions which are
of great ... | 2004.10509v1 |
2020-04-23 | Spectroscopic Orbits of Eleven Nearby, Mid-to-Late M Dwarf Binaries | We present the spectroscopic orbits of eleven nearby, mid-to-late M dwarf
binary systems in a variety of configurations: two single-lined binaries
(SB1s), seven double-lined binaries (SB2s), one double-lined triple (ST2), and
one triple-lined triple (ST3). Eight of these orbits are the first published
for these systems... | 2004.11225v2 |
2020-05-25 | Recovering the city street lighting fraction from skyglow measurements in a large-scale municipal dimming experiment | Anthropogenic skyglow dominates views of the natural night sky in most urban
settings, and the associated emission of artificial light at night (ALAN) into
the environment of cities involves a number of known and suspected negative
externalities. One approach to lowering consumption of ALAN in cities is
dimming or exti... | 2005.12357v1 |
2020-05-31 | Ontology-based systematic classification and analysis of coronaviruses, hosts, and host-coronavirus interactions towards deep understanding of COVID-19 | Given the existing COVID-19 pandemic worldwide, it is critical to
systematically study the interactions between hosts and coronaviruses including
SARS-Cov, MERS-Cov, and SARS-CoV-2 (cause of COVID-19). We first created four
host-pathogen interaction (HPI)-Outcome postulates, and generated a HPI-Outcome
model as the bas... | 2006.00639v1 |
2020-06-23 | Simultaneous compression and opacity data from time-series radiography with a Lagrangian marker | Time-resolved radiography can be used to obtain absolute shock Hugoniot
states by simultaneously measuring at least two mechanical parameters of the
shock, and this technique is particularly suitable for one-dimensional
converging shocks where a single experiment probes a range of pressures as the
converging shock stre... | 2006.13342v3 |
2020-06-30 | EndoSLAM Dataset and An Unsupervised Monocular Visual Odometry and Depth Estimation Approach for Endoscopic Videos: Endo-SfMLearner | Deep learning techniques hold promise to develop dense topography
reconstruction and pose estimation methods for endoscopic videos. However,
currently available datasets do not support effective quantitative
benchmarking. In this paper, we introduce a comprehensive endoscopic SLAM
dataset consisting of 3D point cloud d... | 2006.16670v3 |
2020-08-06 | Magnon versus electron mediated spin-transfer torque exerted by spin currents across antiferromagnetic insulator to switch magnetization of adjacent ferromagnetic metal | The recent experiment [Y. Wang et al., Science 366, 1125 (2019)] on
magnon-mediated spin-transfer torque (MSTT) was interpreted in terms of a
picture where magnons are excited within an antiferromagnetic insulator (AFI),
by applying nonequilibrium electronic spin density at one of its surfaces, so
that their propagatio... | 2008.02794v3 |
2020-08-29 | VR-Caps: A Virtual Environment for Capsule Endoscopy | Current capsule endoscopes and next-generation robotic capsules for diagnosis
and treatment of gastrointestinal diseases are complex cyber-physical platforms
that must orchestrate complex software and hardware functions. The desired
tasks for these systems include visual localization, depth estimation, 3D
mapping, dise... | 2008.12949v2 |
2020-09-01 | Elemental Abundances in M31: Properties of the Inner Stellar Halo | We present measurements of [Fe/H] and [$\alpha$/Fe] for 128 individual red
giant branch stars (RGB) in the stellar halo of M31, including its Giant
Stellar Stream (GSS), obtained using spectral synthesis of low- and
medium-resolution Keck/DEIMOS spectroscopy ($R \sim 3000$ and 6000,
respectively). We observed four fiel... | 2009.00529v1 |
2020-09-02 | The Solar Orbiter mission -- Science overview | Solar Orbiter, the first mission of ESA's Cosmic Vision 2015-2025 programme
and a mission of international collaboration between ESA and NASA, will explore
the Sun and heliosphere from close up and out of the ecliptic plane. It was
launched on 10 February 2020 04:03 UTC from Cape Canaveral and aims to address
key quest... | 2009.00861v1 |
2020-09-03 | Mapping the Escape Fraction of Ionizing Photons Using Resolved Stars: A Much Higher Escape Fraction for NGC 4214 | We demonstrate a new method for measuring the escape fraction of ionizing
photons using Hubble Space Telescope imaging of resolved stars in NGC 4214, a
local analog of high-redshift starburst galaxies that are thought to be
responsible for cosmic reionization. Specifically, we forward model the UV
through near-IR spect... | 2009.01844v1 |
2020-09-16 | Reflection-mode virtual histology using photoacoustic remote sensing microscopy | Histological visualizations are critical to clinical disease management and
are fundamental to biological understanding. However, current approaches that
rely on bright-field microscopy require extensive tissue preparation prior to
imaging. These processes are labor intensive and contribute to delays in
clinical feedba... | 2009.10010v1 |
2020-09-24 | Quantum spin torque driven transmutation of antiferromagnetic Mott insulator | The standard model of spin-transfer torque (STT) in antiferromagnetic
spintronics considers exchange of angular momentum between quantum spins of
flowing electrons and noncollinear-to-them localized spins treated as classical
vectors. These vectors are assumed to realize N\'{e}el order in equilibrium,
$\uparrow \downar... | 2009.11833v3 |
2020-09-29 | The Terahertz Intensity Mapper (TIM): a Next-Generation Experiment for Galaxy Evolution Studies | Understanding the formation and evolution of galaxies over cosmic time is one
of the foremost goals of astrophysics and cosmology today. The cosmic star
formation rate has undergone a dramatic evolution over the course of the last
14 billion years, and dust obscured star forming galaxies (DSFGs) are a crucial
component... | 2009.14340v1 |
2020-10-07 | Fairness in Influence Maximization through Randomization | The influence maximization paradigm has been used by researchers in various
fields in order to study how information spreads in social networks. While
previously the attention was mostly on efficiency, more recently fairness
issues have been taken into account in this scope. In this paper, we propose to
use randomizati... | 2010.03438v4 |
2020-10-10 | Multi-path Neural Networks for On-device Multi-domain Visual Classification | Learning multiple domains/tasks with a single model is important for
improving data efficiency and lowering inference cost for numerous vision
tasks, especially on resource-constrained mobile devices. However,
hand-crafting a multi-domain/task model can be both tedious and challenging.
This paper proposes a novel appro... | 2010.04904v2 |
2020-10-29 | Group-Harmonic and Group-Closeness Maximization -- Approximation and Engineering | Centrality measures characterize important nodes in networks. Efficiently
computing such nodes has received a lot of attention. When considering the
generalization of computing central groups of nodes, challenging optimization
problems occur. In this work, we study two such problems, group-harmonic
maximization and gro... | 2010.15435v1 |
2020-11-19 | A novel in vitro device to deliver induced electromagnetic fields to cell and tissue cultures | We have developed a novel in vitro instrument that can deliver intermediate
frequency (100 - 400 kHz), moderate intensity (up to and exceeding 6.5 V/cm
pk-pk) electric fields (EFs) to cell and tissue cultures generated using
induced electromagnetic fields (EMFs) in a solenoid coil. A major application
of these EFs is a... | 2011.09698v1 |
2020-11-23 | Revealing defect-induced spin disorder in nanocrystalline Ni | We combine magnetometry and magnetic small-angle neutron scattering to study
the influence of the microstructure on the macroscopic magnetic properties of a
nanocrystalline Ni bulk sample, which was prepared by straining via
high-pressure torsion. As seen by magnetometry, the mechanical deformation
leads to a significa... | 2011.11318v4 |
2021-01-05 | The Panchromatic Hubble Andromeda Treasury: Triangulum Extended Region (PHATTER) I. Ultraviolet to Infrared Photometry of 22 Million Stars in M33 | We present panchromatic resolved stellar photometry for 22 million stars in
the Local Group dwarf spiral Triangulum (M33), derived from Hubble Space
Telescope (HST) observations with the Advanced Camera for Surveys (ACS) in the
optical (F475W, F814W), and the Wide Field Camera 3 (WFC3) in the near
ultraviolet (F275W, F... | 2101.01293v1 |
2021-01-20 | Beyond Fine-tuning: Classifying High Resolution Mammograms using Function-Preserving Transformations | The task of classifying mammograms is very challenging because the lesion is
usually small in the high resolution image. The current state-of-the-art
approaches for medical image classification rely on using the de-facto method
for ConvNets - fine-tuning. However, there are fundamental differences between
natural image... | 2101.07945v1 |
2021-01-21 | A decade of radial-velocity monitoring of Vega and new limits on the presence of planets | We present an analysis of 1524 spectra of Vega spanning 10 years, in which we
search for periodic radial velocity variations. A signal with a periodicity of
0.676 days and a semi-amplitude of ~10 m/s is consistent with the rotation
period measured over much shorter time spans by previous spectroscopic and
spectropolari... | 2101.08801v1 |
2021-02-04 | Magnon-spinon dichotomy in the Kitaev hyperhoneycomb $β$-Li$_2$IrO$_3$ | The family of edge-sharing tri-coordinated iridates and ruthenates has
emerged in recent years as a major platform for Kitaev spin liquid physics,
where spins fractionalize into emergent magnetic fluxes and Majorana fermions
with Dirac-like dispersions. While such exotic states are usually pre-empted by
long-range magn... | 2102.02714v2 |
2008-04-04 | Inhomogeneous Gilbert damping from impurities and electron-electron interactions | We present a unified theory of magnetic damping in itinerant electron
ferromagnets at order $q^2$ including electron-electron interactions and
disorder scattering. We show that the Gilbert damping coefficient can be
expressed in terms of the spin conductivity, leading to a Matthiessen-type
formula in which disorder and... | 0804.0820v2 |
2006-12-01 | Gilbert damping and spin Coulomb drag in a magnetized electron liquid with spin-orbit interaction | We present a microscopic calculation of the Gilbert damping constant for the
magnetization of a two-dimensional spin-polarized electron liquid in the
presence of intrinsic spin-orbit interaction. First we show that the Gilbert
constant can be expressed in terms of the auto-correlation function of the
spin-orbit induced... | 0612015v1 |
2011-09-22 | Hole spin relaxation and coefficients in Landau-Lifshitz-Gilbert equation in ferromagnetic GaMnAs | We investigate the temperature dependence of the coefficients in the
Landau-Lifshitz-Gilbert equation in ferromagnetic GaMnAs by employing the Zener
model. We first calculate the hole spin relaxation time based on the
microscopic kinetic equation. We find that the hole spin relaxation time is
typically several tens fem... | 1109.4964v1 |
2002-02-11 | Radiation Induced Landau-Lifshitz-Gilbert Damping in Ferromagnets | The Landau-Lifshitz-Gilbert damping coefficient employed in the analysis of
spin wave ferromagnetic resonance is related to the electrical conductivity of
the sample. The changing magnetization (with time) radiates electromagnetic
fields. The electromagnetic energy is then absorbed by the sample and the
resulting heati... | 0202181v1 |
2008-08-09 | Gilbert Damping in Conducting Ferromagnets I: Kohn-Sham Theory and Atomic-Scale Inhomogeneity | We derive an approximate expression for the Gilbert damping coefficient
\alpha_G of itinerant electron ferromagnets which is based on their description
in terms of spin-density-functional-theory (SDFT) and Kohn-Sham quasiparticle
orbitals. We argue for an expression in which the coupling of magnetization
fluctuations t... | 0808.1373v1 |
2003-09-29 | Damping rates of the atomic velocity in Sisyphus cooling | We present a theoretical and experimental study of the damping process of the
atomic velocity in Sisyphus cooling. The relaxation rates of the atomic kinetic
temperature are determined for a 3D lin$\perp$lin optical lattice. We find that
the damping rates of the atomic temperature depend linearly on the optical
pumping... | 0309209v1 |
2012-11-15 | Spin transport and tunable Gilbert damping in a single-molecule magnet junction | We study time-dependent electronic and spin transport through an electronic
level connected to two leads and coupled with a single-molecule magnet via
exchange interaction. The molecular spin is treated as a classical variable and
precesses around an external magnetic field. We derive expressions for charge
and spin cu... | 1211.3611v2 |
2021-05-08 | A second-order numerical method for Landau-Lifshitz-Gilbert equation with large damping parameters | A second order accurate numerical scheme is proposed and implemented for the
Landau-Lifshitz-Gilbert equation, which models magnetization dynamics in
ferromagnetic materials, with large damping parameters. The main advantages of
this method are associated with the following features: (1) It only solves
linear systems o... | 2105.03576v1 |
2017-09-29 | Non-local Gilbert damping tensor within the torque-torque correlation model | An essential property of magnetic devices is the relaxation rate in magnetic
switching which depends strongly on the damping in the magnetisation dynamics.
It was recently measured that damping depends on the magnetic texture and,
consequently, is a non-local quantity. The damping enters the
Landau-Lifshitz-Gilbert equ... | 1709.10365v1 |
2008-07-18 | Current-induced dynamics of spiral magnet | We study the dynamics of the spiral magnet under the charge current by
solving the Landau-Lifshitz-Gilbert equation numerically. In the steady state,
the current ${\vec j}$ induces (i) the parallel shift of the spiral pattern
with velocity $v=(\beta/\alpha)j$ ($\alpha$, $\beta$: the Gilbert damping
coefficients), (ii) ... | 0807.2901v1 |
2010-03-19 | Dynamics of magnetization on the topological surface | We investigate theoretically the dynamics of magnetization coupled to the
surface Dirac fermions of a three dimensional topological insulator, by
deriving the Landau-Lifshitz-Gilbert (LLG) equation in the presence of charge
current. Both the inverse spin-Galvanic effect and the Gilbert damping
coefficient $\alpha$ are ... | 1003.3769v1 |
2016-02-23 | Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films | The Gilbert damping of ferromagnetic materials is arguably the most important
but least understood phenomenological parameter that dictates real-time
magnetization dynamics. Understanding the physical origin of the Gilbert
damping is highly relevant to developing future fast switching spintronics
devices such as magnet... | 1602.07325v1 |
2019-02-22 | Strongly Enhanced Gilbert Damping in 3d Transition Metal Ferromagnet Monolayers in Contact with Topological Insulator Bi2Se3 | Engineering Gilbert damping of ferromagnetic metal films is of great
importance to exploit and design spintronic devices that are operated with an
ultrahigh speed. Based on scattering theory of Gilbert damping, we extend the
torque method originally used in studies of magnetocrystalline anisotropy to
theoretically dete... | 1902.08700v1 |
2018-08-20 | Gilbert damping of [Co/Pd]n/Py multilayer thin films | Understanding the Gilbert damping in exchange-coupled multilayer materials is
particularly important to develop future fast switching spintronics devices.
Here, we report an experimental investigation of temperature-dependent Gilbert
damping in [Co/Pd]n/Py multilayer films of varying the number of Co/Pd
repetitions by ... | 1808.06515v2 |
2006-10-10 | Spin-transfer in an open ferromagnetic layer: from negative damping to effective temperature | Spin-transfer is a typical spintronics effect that allows a ferromagnetic
layer to be switched by spin-injection. Most of the experimental results about
spin transfer are described on the basis of the Landau-Lifshitz-Gilbert
equation of the magnetization, in which additional current-dependent damping
factors are added,... | 0610264v1 |
2016-07-18 | Magnetic Skyrmion Transport in a Nanotrack With Spatially Varying Damping and Non-adiabatic Torque | Reliable transport of magnetic skyrmions is required for any future
skyrmion-based information processing devices. Here we present a micromagnetic
study of the in-plane current-driven motion of a skyrmion in a ferromagnetic
nanotrack with spatially sinusoidally varying Gilbert damping and/or
non-adiabatic spin-transfer... | 1607.04983v3 |
2003-08-19 | Magnetization relaxation in (Ga,Mn)As ferromagnetic semiconductors | We describe a theory of Mn local-moment magnetization relaxation due to p-d
kinetic-exchange coupling with the itinerant-spin subsystem in the
ferromagnetic semiconductor (Ga,Mn)As alloy. The theoretical Gilbert damping
coefficient implied by this mechanism is calculated as a function of Mn moment
density, hole concent... | 0308386v3 |
2007-08-24 | Enhancement of the Gilbert damping constant due to spin pumping in noncollinear ferromagnet/nonmagnet/ferromagnet trilayer systems | We analyzed the enhancement of the Gilbert damping constant due to spin
pumping in non-collinear ferromagnet / non-magnet / ferromagnet trilayer
systems. We show that the Gilbert damping constant depends both on the
precession angle of the magnetization of the free layer and on the direction of
the magntization of the ... | 0708.3323v1 |
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