Top 10 Arxiv Papers Today


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#1. Complex symplectic structures on Lie algebras
Giovanni Bazzoni, Marco Freibert, Adela Latorre, Benedict Meinke
We investigate Lie algebras endowed with a complex symplectic structure and develop a method, called \emph{complex symplectic oxidation}, to construct certain complex symplectic Lie algebras of dimension $4n+4$ from those of dimension $4n$. We specialize this construction to the nilpotent case and apply complex symplectic oxidation to classify eight-dimensional nilpotent complex symplectic Lie algebras.
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MathPaper: Complex symplectic structures on Lie algebras. https://t.co/DSGVvsn1Ow
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Authors: 4
Total Words: 18676
Unqiue Words: 3007

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#2. No-Frills Human-Object Interaction Detection: Factorization, Appearance and Layout Encodings, and Training Techniques
Tanmay Gupta, Alexander Schwing, Derek Hoiem
We show that with an appropriate factorization, and encodings of layout and appearance constructed from outputs of pretrained object detectors, a relatively simple model outperforms more sophisticated approaches on human-object interaction detection. Our model includes factors for detection scores, human and object appearance, and coarse (box-pair configuration) and optionally fine-grained layout (human pose). We also develop training techniques that improve learning efficiency by: (i) eliminating train-inference mismatch; (ii) rejecting easy negatives during mini-batch training; and (iii) using a ratio of negatives to positives that is two orders of magnitude larger than existing approaches while constructing training mini-batches. We conduct a thorough ablation study to understand the importance of different factors and training techniques using the challenging HICO-Det dataset.
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BrundageBot: No-Frills Human-Object Interaction Detection: Factorization, Appearance and Layout Encodings, and Training Techniques. Tanmay Gupta, Alexander Schwing, and Derek Hoiem https://t.co/aK3xsf12ru
arxivml: "No-Frills Human-Object Interaction Detection: Factorization, Appearance and Layout Encodings, and Training Techniq… https://t.co/JevFiSYqCJ
ComputerPapers: No-Frills Human-Object Interaction Detection: Factorization, Appearance and Layout Encodings, and Training Techniques. https://t.co/CS5qFjvjPw
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Authors: 3
Total Words: 7190
Unqiue Words: 2150

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#3. Automatic Data Expansion for Customer-care Spoken Language Understanding
Shahab Jalalvand, Andrej Ljolje, Srinivas Bangalore
Spoken language understanding (SLU) systems are widely used in handling of customer-care calls.A traditional SLU system consists of an acoustic model (AM) and a language model (LM) that areused to decode the utterance and a natural language understanding (NLU) model that predicts theintent. While AM can be shared across different domains, LM and NLU models need to be trainedspecifically for every new task. However, preparing enough data to train these models is prohibitivelyexpensive. In this paper, we introduce an efficient method to expand the limited in-domain data. Theprocess starts with training a preliminary NLU model based on logistic regression on the in-domaindata. Since the features are based onn= 1,2-grams, we can detect the most informative n-gramsfor each intent class. Using these n-grams, we find the samples in the out-of-domain corpus that1) contain the desired n-gram and/or 2) have similar intent label. The ones which meet the firstconstraint are used to train a new LM model and the ones that meet both constraints...
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arxivml: "Automatic Data Expansion for Customer-care Spoken Language Understanding", Shahab Jalalvand, Andrej Ljolje, Sriniv… https://t.co/kFfJxza74V
arxiv_cscl: Automatic Data Expansion for Customer-care Spoken Language Understanding https://t.co/bT15AgbXIW
arxiv_cscl: Automatic Data Expansion for Customer-care Spoken Language Understanding https://t.co/bT15AgbXIW
arxiv_cscl: Automatic Data Expansion for Customer-care Spoken Language Understanding https://t.co/bT15AgbXIW
ComputerPapers: Automatic Data Expansion for Customer-care Spoken Language Understanding. https://t.co/FyHW6Ydb6y
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Authors: 3
Total Words: 5197
Unqiue Words: 1634

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#4. Piezospectroscopic measurement of high-frequency vibrations in a pulse-tube cryostat
Anne Louchet-Chauvet, Rose Ahlefeldt, Thierry Chanelière
Vibrations in cryocoolers are a recurrent concern to the end user. They appear in different parts of the acoustic spectrum depending on the refrigerator type, Gifford McMahon or pulse-tube, and with a variable coupling strength to the physical system under interest. Here, we use the piezospectroscopic effect in rare-earth crystals at low temperature as a high resolution, contact-less probe for the vibrations. With this optical spectroscopic technique, we obtain and analyze the vibration spectrum up to 700kHz of a 2kW pulse-tube cooler.
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PhysicsPaper: Piezospectroscopic measurement of high-frequency vibrations in a pulse-tube cryostat. https://t.co/SZYiweiQ61
CondMatPhys: Piezospectroscopic measurement of high-frequency vibrations in a pulse-tube cryostat https://t.co/jvI5YbC3Re
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Authors: 3
Total Words: 7127
Unqiue Words: 2466

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#5. On the robustness of the MnSi magnetic structure determined by muon spin rotation
P. Dalmas de Reotier, A. Yaouanc, A. Amato, A. Maisuradze, D. Andreica, B. Roessli, T. Goko, R. Scheuermann, G. Lapertot
Muon spin rotation (muSR) spectra recorded for manganese silicide MnSi and interpreted in terms of a quantitative analysis constrained by symmetry arguments were recently published. The magnetic structures of MnSi in zero-field at low temperature and in the conical phase near the magnetic phase transition were shown to substantially deviate from the expected helical and conical structures. Here, we present material backing the previous results obtained in zero-field. First, from simulations of the field distributions experienced by the muons as a function of relevant parameters we confirm the uniqueness of the initial interpretation and illustrate the remarkable complementarity of neutron scattering and muSR for the MnSi magnetic structure determination. Second we present the result of a muSR experiment performed on MnSi crystallites grown in a Zn-flux and compare it with the previous data recorded with a crystal obtained from Czochralski pulling. We find the magnetic structure for the two types of crystals to be identical within...
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CondensedPapers: On the robustness of the MnSi magnetic structure determined by muon spin rotation. https://t.co/LJqYgz9DRK
CondMatPhys: On the robustness of the MnSi magnetic structure determined by muon spin rotation https://t.co/MIRvE9fnqT
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Authors: 9
Total Words: 5193
Unqiue Words: 1854

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#6. Stability and chaos in the classical three rotor problem
Govind S. Krishnaswami, Himalaya Senapati
We study the equal-mass classical three rotor problem, a variant of the three body problem of celestial mechanics. The quantum N-rotor problem arises via a partial continuum limit of the Wick rotated XY model. In units of the coupling, the energy serves as a control parameter. We find periodic `pendulum' and `breather' orbits at all energies and choreographies at relatively low energies. They furnish analogs of the Euler-Lagrange and figure-8 solutions of the planar three body problem. Integrability at very low energies gives way to a rather marked transition to chaos at $E_c \approx 4$, followed by a gradual return to regularity as $E \to \infty$. We find four signatures of this transition: (a) the fraction of the area of Poincar\'e surfaces occupied by chaotic sections rises sharply at $E_c$, (b) discrete symmetries are spontaneously broken at $E_c$, (c) $E=4$ is an accumulation point of stable to unstable transitions in pendulum solutions and (d) the Jacobi-Maupertuis curvature goes from being positive to having both signs...
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MathPHYPapers: Stability and chaos in the classical three rotor problem. https://t.co/YkhzqaDn8z
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Authors: 2
Total Words: 3456
Unqiue Words: 1157

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#7. An Entropy-Area Law for Neutron Stars Near the Black Hole Threshold
Stephon H. Alexander, Kent Yagi, Nicolas Yunes
Neutron stars exhibit a set of universal relations independent of their equation of state that bears semblance to the black hole no hair relations. Motivated by this, we analytically and numerically explore other relations that connect neutron star and black hole universality. By analyzing two different measures, we find that certain rescaled entropies possess a nearly universal behavior. We also discover that when the compactness of neutron stars approaches the black hole limit, the rescaled entropy approaches that of a black hole, and the thermodynamic entropy scales with the stellar surface area in an ever more universal way.
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eXtremeGrav: Lots of big news in #Physics yesterday, so you can be forgiven if you missed this: https://t.co/FZfZqvzbbs "An Entropy-Area Law for Neutron Stars Near the Black Hole Threshold" by Stephon Alexander (@stephstem), Kent Yagi, and Nico Yunes.
RelativityPaper: An Entropy-Area Law for Neutron Stars Near the Black Hole Threshold. https://t.co/KRGcEH12ev
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Authors: 3
Total Words: 8213
Unqiue Words: 2012

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#8. The η'-carbon potential at low meson momenta
M. Nanova, S. Friedrich, V. Metag, E. Ya. Paryev, F. N. Afzal, D. Bayadilov, B. Bantes, R. Beck, M. Becker, S. Böse, K. -T. Brinkmann, V. Crede, P. Drexler, H. Eberhardt, D. Elsner, F. Frommberger, Ch. Funke, M. Gottschall, M. Grüner, E. Gutz, Ch. Hammann, J. Hannappel, J. Hartmann, W. Hillert, Ph. Hoffmeister, Ch. Honisch, T. Jude, D. Kaiser, F. Kalischewski, I. Keshelashvili, F. Klein, K. Koop, B. Krusche, M. Lang, K. Makonyi, F. Messi, J. Müller, J. Müllers, D. Piontek, T. Rostomyan, D. Schaab, Ch. Schmidt, H. Schmieden, R. Schmitz, T. Seifen, V. Sokhoyan, C. Sowa, K. Spieker, A. Thiel, U. Thoma, T. Triffterer, M. Urban, H. van Pee, D. Walther, Ch. Wendel, D. Werthmüller, U. Wiedner, A. Wilson, L. Witthauer, Y. Wunderlich, H. -G. Zaunick
The production of $\eta^\prime$ mesons in coincidence with forward-going protons has been studied in photon-induced reactions on $^{12}$C and on a liquid hydrogen (LH$_2$) target for incoming photon energies of 1.3-2.6 GeV at the electron accelerator ELSA. The $\eta^\prime$ mesons have been identified via the $\eta^\prime\rightarrow \pi^0 \pi^0\eta \rightarrow 6 \gamma$ decay registered with the CBELSA/TAPS detector system. Coincident protons have been identified in the MiniTAPS BaF$_2$ array at polar angles of $2^{\circ} \le \theta _{p} \le 11^{\circ}$. Under these kinematic constraints the $\eta^\prime$ mesons are produced with relatively low kinetic energy ($\approx$ 150 MeV) since the coincident protons take over most of the momentum of the incident-photon beam. For the C-target this allows the determination of the real part of the $\eta^\prime$-carbon potential at low meson momenta by comparing with collision model calculations of the $\eta^\prime$ kinetic energy distribution and excitation function. Fitting the latter data...
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NuclearPapers: The {\eta}'-carbon potential at low meson momenta. https://t.co/Kp7czWD5bq
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Authors: 61
Total Words: 6972
Unqiue Words: 1834

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#9. Feshbach resonances in $^{23}\mathrm{Na}+$$^{39}\mathrm{K}$ mixtures and refined molecular potentials for the NaK molecule
Torsten Hartmann, Torben A. Schulze, Kai K. Voges, Philipp Gersema, Matthias W. Gempel, Eberhard Tiemann, Alessandro Zenesini, Silke Ospelkaus
We present a detailed study of interspecies Feshbach resonances of the bosonic $^{23}\mathrm{Na}+$$^{39}\mathrm{K}$ mixture for magnetic fields up to $750 \, \mathrm{G}$ in various collision channels. A total of fourteen Feshbach resonances are reported, as well as four zero crossings of the scattering length and three inelastic two-body loss features. We use the observed magnetic field locations of the resonant features together with the known data on $^{23}\mathrm{Na}+$$^{40}\mathrm{K}$ to refine the singlet and triplet ground state potentials of NaK and achieve a consistent description of Feshbach resonances for both, the Bose-Bose mixture of $^{23}\mathrm{Na}+$$^{39}\mathrm{K}$ as well as the Bose-Fermi mixture of $^{23}\mathrm{Na}+$$^{40}\mathrm{K}$.
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PhysicsPaper: Feshbach resonances in $^{23}\mathrm{Na}+$$^{39}\mathrm{K}$ mixtures and refined molecular potentials for the NaK molecule. https://t.co/Tc2yP5ZE3p
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Authors: 8
Total Words: 4976
Unqiue Words: 1684

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#10. A unified geometric framework for boundary charges and dressings: non-Abelian theory and matter
Henrique Gomes, Florian Hopfmüller, Aldo Riello
Boundaries in gauge theories are a delicate issue. We approach it through a geometric formalism based on the space of field configurations (field-space). Our main geometric tool is a connection 1-form on field-space, $\varpi$, which we introduce and explore in detail. Using it, we upgrade the presymplectic structure of Yang-Mills theory with boundaries to be invariant even under field-dependent gauge transformations. The gauge charges always vanish, while global charges still arise for configurations with global symmetries. The formalism is powerful because it is relational: the field-content itself is used as a reference frame to distinguish `gauge' and `physical'; no new degrees of freedom (e.g. group-valued edge modes) are required. Different choices of reference fields give different $\varpi$'s, which are related to gauge-fixings such as Higgs unitary and Coulomb gauge. But the formalism extends well beyond gauge-fixings, for instance by avoiding the Gribov problem. For one choice of $\varpi$, Goldstone modes arising from the...
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arxiv_org: A unified geometric framework for boundary charges and dressings: non-Abelian theory and... https://t.co/uul6BmhS5l https://t.co/Y10zJCyGim
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Total Words: 33362
Unqiue Words: 5959

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