cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Low-temperature magnetic fluctuations in the Kondo insulator SmB6
Creators: name: Biswas, P. K.
name: Salman, Z.
name: Neupert, T.
name: Morenzoni, E.
name: Pomjakushina, E.
name: von Rohr, F.
name: Conder, K.
name: Balakrishnan, G.
name: Hatnean, M. Ciomaga
name: Lees, M. R.
name: Paul, D. McK.
name: Schilling, A.
name: Baines, C.
name: Luetkens, H.
name: Khasanov, R.
name: Amato, A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present the results of a systematic investigation of the magnetic properties of the three-dimensional Kondo topological insulator SmB6 using magnetization and muon-spin relaxation/rotation (muSR) measurements. The muSR measurements exhibit magnetic field fluctuations in SmB6 below 15 K due to electronic moments present in the system. However, no evidence for magnetic ordering is found down to 19 mK. The observed magnetism in SmB6 is homogeneous in nature throughout the full volume of the sample. Bulk magnetization measurements on the same sample show consistent behavior. The agreement between muSR, magnetization, and NMR results strongly indicate the appearance of intrinsic bulk magnetic in-gap states associated with fluctuating magnetic fields in SmB6 at low temperature.
description: 5 pages, 5 figures
Random density matrices: Analytical results for mean root fidelity and mean square Bures distance
Creators: name: Laha, Aritra
name: Aggarwal, Agrim
name: Kumar, Santosh
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: 94A15, 62B10, 81P47, 60B20, 15B52

description: Bures distance holds a special place among various distance measures due to its several distinguished features and finds applications in diverse problems in quantum information theory. It is related to fidelity and, among other things, it serves as a bona fide measure for quantifying the separability of quantum states. In this work, we calculate exact analytical results for the mean root fidelity and mean square Bures distance between a fixed density matrix and a random density matrix, and also between two random density matrices. In the course of derivation, we also obtain spectral density for product of above pairs of density matrices. We corroborate our analytical results using Monte Carlo simulations. Moreover, we compare these results with the mean square Bures distance between reduced density matrices generated using coupled kicked tops and find very good agreement.
description: 13 pages, 10 figures ; Published Version
Matroid relaxations and Kazhdan-Lusztig non-degeneracy
Creators: name: Ferroni, Luis
name: Vecchi, Lorenzo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper we study the interplay between the operation of circuit-hyperplane relaxation and the Kazhdan--Lusztig theory of matroids. We obtain a family of polynomials, not depending on the matroids but only on their ranks, that relate the Kazhdan--Lusztig, the inverse Kazhdan--Lusztig and the $Z$-polynomial of each matroid with those of its relaxations. As an application of our main theorem, we prove that all matroids having a free basis are non-degenerate. Additionally, we obtain bounds and explicit formulas for all the coefficients of the Kazhdan--Lusztig, inverse Kazhdan--Lusztig and $Z$-polynomial of all sparse paving matroids.
description: 25 pages. To appear in Algebraic Combinatorics
Near-optimal Anomaly Detection in Graphs using Lovasz Extended Scan Statistic
Creators: name: Sharpnack, James
name: Krishnamurthy, Akshay
name: Singh, Aarti
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: 62G10

description: The detection of anomalous activity in graphs is a statistical problem that arises in many applications, such as network surveillance, disease outbreak detection, and activity monitoring in social networks. Beyond its wide applicability, graph structured anomaly detection serves as a case study in the difficulty of balancing computational complexity with statistical power. In this work, we develop from first principles the generalized likelihood ratio test for determining if there is a well connected region of activation over the vertices in the graph in Gaussian noise. Because this test is computationally infeasible, we provide a relaxation, called the Lovasz extended scan statistic (LESS) that uses submodularity to approximate the intractable generalized likelihood ratio. We demonstrate a connection between LESS and maximum a-posteriori inference in Markov random fields, which provides us with a poly-time algorithm for LESS. Using electrical network theory, we are able to control type 1 error for LESS and prove conditions under which LESS is risk consistent. Finally, we consider specific graph models, the torus, k-nearest neighbor graphs, and epsilon-random graphs. We show that on these graphs our results provide near-optimal performance by matching our results to known lower bounds.
Fine Selmer groups of congruent $p$-adic Galois representations
Creators: name: Kleine, Sören
name: Müller, Katharina
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11R23

description: We compare the Pontryagin duals of fine Selmer groups of two congruent $p$-adic Galois representations over admissible pro-$p$, $p$-adic Lie extensions $K_\infty$ of number fields $K$. We prove that in several natural settings the $π$-primary submodules of the Pontryagin duals are pseudo-isomorphic over the Iwasawa algebra; if the coranks of the fine Selmer groups are not equal, then we can still prove inequalities between the $μ$-invariants. In the special case of a $\mathbb{Z}_p$-extension $K_\infty/K$, we also compare the Iwasawa $λ$-invariants of the fine Selmer groups, even in situations where the $μ$-invariants are non-zero. Finally, we prove similar results for certain abelian non-$p$-extensions.
description: 17 pages
The Herschel view of circumstellar discs: a multi-wavelength study of Chamaeleon I
Creators: name: Rodgers-Lee, Donna
name: Scholz, Alexander
name: Natta, Antonella
name: Ray, Tom
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the results of a multi-wavelength study of circumstellar discs around 44 young stellar objects in the 3 Myr old nearby Chamaeleon I star-forming region. In particular, we explore the far-infrared/submm regime using Herschel fluxes. We show that Herschel fluxes at 160-500$\,μ$m can be used to derive robust estimates of the disc mass. The median disc mass is 0.005$M_{\odot}$ for a sample of 28 Class IIs and 0.006$M_{\odot}$ for 6 transition disks (TDs). The fraction of objects in Chamaeleon-I with at least the `minimum mass solar nebula' is 2-7%. This is consistent with previously published results for Taurus, IC348, $ρ$ Oph. Diagrams of spectral slopes show the effect of specific evolutionary processes in circumstellar discs. Class II objects show a wide scatter that can be explained by dust settling. We identify a continuous trend from Class II to TDs. Including Herschel fluxes in this type of analysis highlights the diversity of TDs. We find that TDs are not significantly different to Class II discs in terms of far-infrared luminosity, disc mass or degree of dust settling. This indicates that inner dust clearing occurs independently from other evolutionary processes in the discs.
description: 16 pages, 13 figures. Accepted for publication in MNRAS
Self-organisation of highly symmetric nanoassemblies: a matter of competition
Creators: name: Galván-Moya, Jesus E.
name: Altantzis, Thomas
name: Nelissen, Kwinten
name: Peeters, Francois M.
name: Grzelczak, Marek
name: Liz-Marzán, Luis M.
name: Bals, Sara
name: Van Tendeloo, Gustaaf
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The properties and applications of metallic nanoparticles are inseparably connected not only to their detailed morphology and composition, but also to their structural configuration and mutual interactions. As a result, the assemblies often have superior properties as compared to individual nanoparticles. Although it has been reported that nanoparticles can form highly symmetric clusters, if the configuration can be predicted as a function of the synthesis parameters, more targeted and accurate synthesis will be possible. We present here a theoretical model that accurately predicts the structure and configuration of self-assembled gold nanoclusters. The validity of the model is verified using quantitative experimental data extracted from electron tomography 3D reconstructions of different assemblies. The present theoretical model is generic and can in principle be used for different types of nanoparticles, providing a very wide window of potential applications.
description: Manuscript (17 pages), Support Info (12 pages), 7 figures
Equations in three singular moduli: the equal exponent case
Creators: name: Fowler, Guy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $a \in \mathbb{Z}_{>0}$ and $ε_1, ε_2, ε_3 \in \{\pm 1\}$. We classify explicitly all singular moduli $x_1, x_2, x_3$ satisfying either $ε_1 x_1^a + ε_2 x_2^a + ε_3 x_3^a \in \mathbb{Q}$ or $(x_1^{ε_1} x_2^{ε_2} x_3^{ε_3})^{a} \in \mathbb{Q}^{\times}$. In particular, we show that all the solutions in singular moduli $x_1, x_2, x_3$ to the Fermat equations $x_1^a + x_2^a + x_3^a= 0$ and $x_1^a + x_2^a - x_3^a= 0$ satisfy $x_1 x_2 x_3 = 0$. Our proofs use a generalisation of a result of Faye and Riffaut on the fields generated by sums and products of two singular moduli, which we also establish.
description: Minor changes
Covers Map: Estonian
Creators: name: Reynolds, Matthew
Publisher: name: University of Oxford
Year: 2023
Subjects: Literary studies not elsewhere classified
Translation and interpretation studies

description: The Covers Maps present a selection of book covers linked to their place of publication. The accuracy of that ‘place’ varies. When we have been able to find a street address for the publisher, we have used that as the book’s location on the map and also listed it beneath the cover image (though it may sometimes be the case that the address was different at the time of publication). When we have not been able to find a street address we have supplied a random location within the town or city concerned: in these cases no address is listed beneath the cover image. The aim of the Covers Maps is to focus attention on the covers while also making visible two conditions of their existence: that they are connected to particular publishing contexts, and that they succeed one another through time. Often, the covers presented in the Covers Maps represent only one or a few of several editions through which a given translation has passed. Fuller information about first and other editions can be found in the World Map and the General Map. The Covers Maps were created by Giovanni Pietro Vitali and Simone Landucci. The Estonian Covers map presents research by Madli Kütt.For details of the translations quoted, and discussion, see Matthew Reynolds et al., Prismatic Jane Eyre: Close-Reading a World Novel Across Languages (Cambridge: Open Book, 2023). https://www.openbookpublishers.com/books/10.11647/obp.0319
Landau Levels as a Limiting Case of a Model with the Morse-Like Magnetic Field
Creators: name: Fakhri, H.
name: Mojaveri, B.
name: Nobary, M. A. Gomshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the quantum mechanics of an electron trapped on an infinite band along the $x$-axis in the presence of the Morse-like perpendicular magnetic field $\vec{B}=-B_{0}e^{-\frac{2π}{a_{0}}x}\hat{k}$ with $B_{0}>0$ as a constant strength and $a_{0}$ as the width of the band. It is shown that the square integrable pure states realize representations of $su(1,1)$ algebra via the quantum number corresponding to the linear momentum in the $y$-direction. The energy of the states increases by decreasing the width $a_{0}$ while it is not changed by $B_{0}$. It is quadratic in terms of two quantum numbers, and the linear spectrum of the Landau levels is obtained as a limiting case of $a_{0}\rightarrow\infty$. All of the lowest states of the $su(1,1)$ representations minimize uncertainty relation and the minimizing of their second and third states is transformed to that of the Landau levels in the limit $a_{0}\rightarrow\infty$. The compact forms of the Barut-Girardello coherent states corresponding to $l$-representation of $su(1,1)$ algebra and their positive definite measures on the complex plane are also calculated.
Spin-orbit coupling in quantum gases
Creators: name: Galitski, Victor
name: Spielman, Ian B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Spin-orbit coupling links a particle's velocity to its quantum mechanical spin, and is essential in numerous condensed matter phenomena, including topological insulators and Majorana fermions. In solid-state materials, spin-orbit coupling originates from the movement of electrons in a crystal's intrinsic electric field, which is uniquely prescribed. In contrast, for ultracold atomic systems, the engineered "material parameters" are tuneable: a variety of synthetic spin-orbit couplings can be engineered on demand using laser fields. Here we outline the current experimental and theoretical status of spin-orbit coupling in ultracold atomic systems, discussing unique features that enable physics impossible in any other known setting.
description: Review article. Current as of Feb. 2013
Covers Map: Estonia
Creators: name: Reynolds, Matthew
Publisher: name: University of Oxford
Year: 2023
Subjects: Literary studies not elsewhere classified
Translation and interpretation studies

description: The Covers Maps present a selection of book covers linked to their place of publication. The accuracy of that ‘place’ varies. When we have been able to find a street address for the publisher, we have used that as the book’s location on the map and also listed it beneath the cover image (though it may sometimes be the case that the address was different at the time of publication). When we have not been able to find a street address we have supplied a random location within the town or city concerned: in these cases no address is listed beneath the cover image. The aim of the Covers Maps is to focus attention on the covers while also making visible two conditions of their existence: that they are connected to particular publishing contexts, and that they succeed one another through time. Often, the covers presented in the Covers Maps represent only one or a few of several editions through which a given translation has passed. Fuller information about first and other editions can be found in the World Map and the General Map. The Covers Maps were created by Giovanni Pietro Vitali and Simone Landucci. The Estonian Covers map presents research by Madli Kütt.For details of the translations quoted, and discussion, see Matthew Reynolds et al., Prismatic Jane Eyre: Close-Reading a World Novel Across Languages (Cambridge: Open Book, 2023). https://www.openbookpublishers.com/books/10.11647/obp.0319
A subsolution theorem for the Monge-Ampère equation over an almost Hermitian manifold
Creators: name: Zhang, Jiaogen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 32W20, 32Q60, 35B50, 31C10

description: Let $Ω\subseteq M$ be a bounded domain with a smooth boundary $\partialΩ$, where $(M,J,g)$ is a compact, almost Hermitian manifold. The main result of this paper is to consider the Dirichlet problem for a complex Monge-Ampère equation on $Ω$. Under the existence of a $C^{2}$-smooth strictly $J$-plurisubharmonic ($J$-psh for short) subsolution, we can solve this Dirichlet problem. Our method is based on the properties of subsolutions which have been widely used for fully nonlinear elliptic equations over Hermitian manifolds.
Phenomenology of Unified Dark Matter models with fast transition
Creators: name: Rozas-Fernández, Alberto
name: Bruni, Marco
name: Lazkoz, Ruth
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A fast transition between a standard matter-like era and a late $Λ$CDM-like epoch generated by a single Unified Dark Matter component can explain the observed acceleration of the Universe. UDM models with a fast transition should be clearly distinguishable from $Λ$CDM (and alternatives) through observations. Here we focus on a particularly simple model and analyse its viability by studying features of the background model and properties of the adiabatic UDM perturbations.
description: 4 pages, 1 figure, Proceedings of the Spanish Relativity Meeting ERE2012, University of Minho, Guimar\~aes, Portugal, September 3-7, 2012
Covers Map: Hebrew
Creators: name: Reynolds, Matthew
Publisher: name: University of Oxford
Year: 2023
Subjects: Translation and interpretation studies
Literary studies not elsewhere classified

description: For details of the translations quoted, and discussion, see Matthew Reynolds et al., Prismatic Jane Eyre: Close-Reading a World Novel Across Languages (Cambridge: Open Book, 2023). https://www.openbookpublishers.com/books/10.11647/obp.0319 The Covers Maps present a selection of book covers linked to their place of publication. The accuracy of that ‘place’ varies. When we have been able to find a street address for the publisher, we have used that as the book’s location on the map and also listed it beneath the cover image (though it may sometimes be the case that the address was different at the time of publication). When we have not been able to find a street address we have supplied a random location within the town or city concerned: in these cases no address is listed beneath the cover image. The aim of the Covers Maps is to focus attention on the covers while also making visible two conditions of their existence: that they are connected to particular publishing contexts, and that they succeed one another through time. Often, the covers presented in the Covers Maps represent only one or a few of several editions through which a given translation has passed. Fuller information about first and other editions can be found in the World Map and the General Map. The Covers Maps were created by Giovanni Pietro Vitali and Simone Landucci. The Hebrew Covers map presents research by Adriana X. Jacobs.
Covers Map: German
Creators: name: Reynolds, Matthew
Publisher: name: University of Oxford
Year: 2023
Subjects: Translation and interpretation studies
Literary studies not elsewhere classified

description: For details of the translations quoted, and discussion, see Matthew Reynolds et al., Prismatic Jane Eyre: Close-Reading a World Novel Across Languages (Cambridge: Open Book, 2023). https://www.openbookpublishers.com/books/10.11647/obp.0319 The Covers Maps present a selection of book covers linked to their place of publication. The accuracy of that ‘place’ varies. When we have been able to find a street address for the publisher, we have used that as the book’s location on the map and also listed it beneath the cover image (though it may sometimes be the case that the address was different at the time of publication). When we have not been able to find a street address we have supplied a random location within the town or city concerned: in these cases no address is listed beneath the cover image. The aim of the Covers Maps is to focus attention on the covers while also making visible two conditions of their existence: that they are connected to particular publishing contexts, and that they succeed one another through time. Often, the covers presented in the Covers Maps represent only one or a few of several editions through which a given translation has passed. Fuller information about first and other editions can be found in the World Map and the General Map. The Covers Maps were created by Giovanni Pietro Vitali and Simone Landucci. The German Covers map presents research by Mary Frank and Tom Cheesman.
Spectral origin of the colossal magnetodielectric effect in multiferroic DyMn2O5
Creators: name: Sushkov, A. B.
name: Kant, Ch.
name: Schiebl, M.
name: Shuvaev, A. M.
name: Pimenov, Anna
name: Pimenov, Andrei
name: Lorenz, B.
name: Park, S.
name: Cheong, S-W.
name: Mostovoy, Maxim
name: Drew, H. D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The origin of the colossal magnetodielectric effect in DyMn2O5 [1] has been an outstanding question in multiferroics. Here, we report the activation of the electric dipole mode at 4-5 cm-1 in an applied magnetic field which fully accounts for the CMD effect. We examine two alternative explanations of this mode: an electromagnon and transitions between f-electron levels of Dy3+ ions. The experimental and theoretical evidence supports the electromagnon origin of the CMD effect.
description: 5 pages, 4 figures, submitted to PRL
Searching for primordial non-Gaussianity in Planck CMB maps using a combined estimator
Creators: name: Novaes, C. P.
name: Bernui, A.
name: Ferreira, I. S.
name: Wuensche, C. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The extensive search for deviations from Gaussianity in cosmic microwave background radiation (CMB) data is very important due to the information about the very early moments of the universe encoded there. Recent analyses from Planck CMB data do not exclude the presence of non-Gaussianity of small amplitude, although they are consistent with the Gaussian hypothesis. The use of different techniques is essential to provide information about types and amplitudes of non-Gaussianities in the CMB data. In particular, we find interesting to construct an estimator based upon the combination of two powerful statistical tools that appears to be sensitive enough to detect tiny deviations from Gaussianity in CMB maps. This estimator combines the Minkowski functionals with a Neural Network, maximizing a tool widely used to study non-Gaussian signals with a reinforcement of another tool designed to identify patterns in a data set. We test our estimator by analyzing simulated CMB maps contaminated with different amounts of local primordial non-Gaussianity quantified by the dimensionless parameter fNL. We apply it to these sets of CMB maps and find \gtrsim 98% of chance of positive detection, even for small intensity local non-Gaussianity like fNL = 38 +/- 18, the current limit from Planck data for large angular scales. Additionally, we test the suitability to distinguish between primary and secondary non-Gaussianities and find out that our method successfully classifies ~ 95% of the tested maps. Furthermore, we analyze the foreground-cleaned Planck maps obtaining constraints for non-Gaussianity at large-angles that are in good agreement with recent constraints. Finally, we also test the robustness of our estimator including cut-sky masks and realistic noise maps measured by Planck, obtaining successful results as well.
Generalized $su(2)$ coherent states for the Landau levels and their nonclassical properties
Creators: name: Dehghani, A.
name: Mojaveri, B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Operator Algebras (math.OA)
subject: Optics (physics.optics)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Following the lines of the recent papers [J. Phys. A: Math. Theor. 44, 495201 (2012); Eur. Phys. J. D 67, 179 (2013)], we construct here a new class of generalized coherent states related to the Landau levels, which can be used as the finite Fock subspaces for the representation of the $su(2)$ Lie algebra. We establish the relationship between them and the deformed truncated coherent states. We have, also, shown that they satisfy the resolution of the identity property through a positive definite measures on the complex plane. Their nonclassical and quantum statistical properties such as quadrature squeezing, higher order `$su(2)$' squeezing, anti-bunching and anti-correlation effects are studied in details. Particularly, the influence of the generalization on the nonclassical properties of two modes is clarified.
description: arXiv admin note: text overlap with arXiv:1212.6888, arXiv:1404.3277
Breakdown of the Peierls substitution for the Haldane model with ultracold atoms
Creators: name: Ibañez-Azpiroz, Julen
name: Eiguren, Asier
name: Bergara, Aitor
name: Pettini, Giulio
name: Modugno, Michele
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present two independent calculations of the tight-binding parameters for a specific realization of the Haldane model with ultracold atoms. The tunneling coefficients up to next-to-nearest neighbors are computed ab-initio by using the maximally localized Wannier functions, and compared to analytical expressions written in terms of gauge invariant, measurable properties of the spectrum. The two approaches present a remarkable agreement and evidence the breakdown of the Peierls substitution: (i) the phase acquired by the next-to-nearest tunneling amplitude $t_{1}$ presents quantitative and qualitative differences with respect to that obtained by the integral of the vector field A, as considered in the Peierls substitution, even in the regime of low amplitudes of A; (ii) for larger values, also $|t_{1}|$ and the nearest-neighbor tunneling $t_{0}$ have a marked dependence on A. The origin of this behavior and its implications are discussed.
description: 5 pages, 5 figures
Decoherence: a closed-system approach
Creators: name: Fortin, Sebastian
name: Lombardi, Olimpia
name: Castagnino, Mario
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The aim of this paper is to review a new perspective about decoherence, according to which formalisms originally devised to deal just with closed or open systems can be subsumed under a closed-system approach that generalizes the traditional account of the phenomenon. This new viewpoint dissolves certain conceptual difficulties of the orthodox open-system approach but, at the same time, shows that the openness of the quantum system is not the essential ingredient for decoherence, as commonly claimed. Moreover, when the behavior of a decoherent system is described from a closed-system perspective, the account of decoherence turns out to be more general than that supplied by the open-system approach, and the quantum-to-classical transition defines unequivocally the realm of classicality by identifying the observables with classical-like behavior.
description: 19 pages, 1 figure
On a class of pseudodifferential operators on the product of compact Lie groups
Creators: name: Federico, Serena
name: Parmeggiani, Alberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: In this paper a bisingular pseudodifferential calculus, along the lines of the one introduced by L. Rodino in [12], is developed in the global setting of a product of compact Lie groups. The approach follows that introduced by M. Ruzhansky and V. Turunen [13] (see also V. Fischer [5]), in that it exploits the harmonic analysis of the groups involved.
Quantum metrology with imperfect measurements
Creators: name: Len, Yink Loong
name: Gefen, Tuvia
name: Retzker, Alex
name: Kołodyński, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The impact of measurement imperfections on quantum metrology protocols has not been approached in a systematic manner so far. In this work, we tackle this issue by generalising firstly the notion of quantum Fisher information to account for noisy detection, and propose tractable methods allowing for its approximate evaluation. We then show that in canonical scenarios involving $N$ probes with local measurements undergoing readout noise, the optimal sensitivity depends crucially on the control operations allowed to counterbalance the measurement imperfections -- with global control operations, the ideal sensitivity (e.g.~the Heisenberg scaling) can always be recovered in the asymptotic $N$ limit, while with local control operations the quantum-enhancement of sensitivity is constrained to a constant factor. We illustrate our findings with an example of NV-centre magnetometry, as well as schemes involving spin-$1/2$ probes with bit-flip errors affecting their two-outcome measurements, for which we find the input states and control unitary operations sufficient to attain the ultimate asymptotic precision.
description: v2. 33 pages, 14 figures. Comments are welcome
Learning to Discriminate Information for Online Action Detection: Analysis and Application
Creators: name: Lee, Sumin
name: Eun, Hyunjun
name: Moon, Jinyoung
name: Choi, Seokeon
name: Kim, Yoonhyung
name: Jung, Chanho
name: Kim, Changick
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Online action detection, which aims to identify an ongoing action from a streaming video, is an important subject in real-world applications. For this task, previous methods use recurrent neural networks for modeling temporal relations in an input sequence. However, these methods overlook the fact that the input image sequence includes not only the action of interest but background and irrelevant actions. This would induce recurrent units to accumulate unnecessary information for encoding features on the action of interest. To overcome this problem, we propose a novel recurrent unit, named Information Discrimination Unit (IDU), which explicitly discriminates the information relevancy between an ongoing action and others to decide whether to accumulate the input information. This enables learning more discriminative representations for identifying an ongoing action. In this paper, we further present a new recurrent unit, called Information Integration Unit (IIU), for action anticipation. Our IIU exploits the outputs from IDU as pseudo action labels as well as RGB frames to learn enriched features of observed actions effectively. In experiments on TVSeries and THUMOS-14, the proposed methods outperform state-of-the-art methods by a significant margin in online action detection and action anticipation. Moreover, we demonstrate the effectiveness of the proposed units by conducting comprehensive ablation studies.
description: To appear in TPAMI. arXiv admin note: substantial text overlap with arXiv:1912.04461
Toy models for hierarchy studies
Creators: name: Álvarez-Luna, Clara
name: Cembranos, José A. R.
name: Sanz-Cillero, Juan José
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We provide a simple computation in order to estimate the probability of a given hierarchy between two scales. In particular, we work in a model provided with a gauge symmetry, with two scalar doublets. We start from a scale-invariant classical Lagrangian, but by taking into account the Coleman-Weinberg mechanism, we obtain masses for the gauge bosons and the scalars. This approach typically provides a light (L) and a heavy (H) sector related to the two different vacuum expectation values of the two scalars. We compute the size of the hyper-volume of the parameter space of the model associated with an interval of mass ratios between these two sectors. We define the probability as proportional to this size and conclude that probabilities of very large hierarchies are not negligible in the type of models studied in this letter.
description: 11 pages, 5 figures. Published version, appendices added
Remarks on the effects of quantum corrections on moduli stabilization and de Sitter vacua in type IIB string theory
Creators: name: Basiouris, Vasileios
name: Leontaris, George K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The rôle of string loop corrections on the existence of de Sitter vacua and the moduli stabilization problem is examined in type IIB effective theories. The fundamental building blocks are a minimum of three intersecting D7 brane stacks, three Kähler moduli, and a novel Einstein-Hilbert term associated with higher derivative terms of the 10-dimensional effective action. It was shown in previous works that loop corrections appear which induce novel logarithmic volume-dependent terms in the effective potential. When D-term contributions are considered, all Kähler moduli are stabilized and de Sitter vacua are achieved. In the present work, a comprehensive study of multiple non-perturbative terms in the superpotential is undertaken. The combined effects of the logarithmic loop corrections and two non-perturbative superpotential Kähler moduli dependent terms have been investigated. It is shown that a variety of fluxes exist for large as well as moderate volume compactifications which define a de Sitter space and stabilize the moduli fields. For large volumes, a generic simple form of the potential is achieved. The so obtained effective potential appears to be promising for cosmological applications.
description: 25 pages, 6 figures
Low-Energy (<10 keV) Electron Ionization and Recombination Model for a Liquid Argon Detector
Creators: name: Foxe, Michael
name: Hagmann, Chris
name: Jovanovic, Igor
name: Bernstein, Adam
name: Kazkaz, Kareem
name: Mozin, Vladimir
name: Pereverzev, Sergey
name: Sangiorgio, Samuele
name: Sorensen, Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Detailed understanding of the ionization process in noble liquid detectors is important for their use in applications such as the search for dark matter and coherent elastic neutrino-nucleus scattering. The response of noble liquid detectors to low-energy ionization events is poorly understood at this time. We describe a new simulation tool which predicts the ionization yield from electronic energy deposits (E < 10keV) in liquid Ar, including the dependence of the yield on the applied electric drift field. The ionization signal produced in a liquid argon detector from $^{37}$Ar beta decay and $^{55}$Fe X-rays has been calculated using the new model.
Model-Free Safety-Critical Control for Robotic Systems
Creators: name: Molnar, Tamas G.
name: Cosner, Ryan K.
name: Singletary, Andrew W.
name: Ubellacker, Wyatt
name: Ames, Aaron D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: Dynamical Systems (math.DS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: This paper presents a framework for the safety-critical control of robotic systems, when safety is defined on safe regions in the configuration space. To maintain safety, we synthesize a safe velocity based on control barrier function theory without relying on a -- potentially complicated -- high-fidelity dynamical model of the robot. Then, we track the safe velocity with a tracking controller. This culminates in model-free safety critical control. We prove theoretical safety guarantees for the proposed method. Finally, we demonstrate that this approach is application-agnostic. We execute an obstacle avoidance task with a Segway in high-fidelity simulation, as well as with a Drone and a Quadruped in hardware experiments.
description: Accepted to the IEEE Robotics and Automation Letters (RA-L) and submitted to the 2022 IEEE International Conference on Robotics and Automation (ICRA). 8 pages, 5 figures
Numerical Reproducibility and Parallel Computations: Issues for Interval Algorithms
Creators: name: Revol, Nathalie
name: Théveny, Philippe
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: What is called "numerical reproducibility" is the problem of getting the same result when the scientific computation is run several times, either on the same machine or on different machines, with different types and numbers of processing units, execution environments, computational loads etc. This problem is especially stringent for HPC numerical simulations. In what follows, the focus is on parallel implementations of interval arithmetic using floating-point arithmetic. For interval computations, numerical reproducibility is of course an issue for testing and debugging purposes. However, as long as the computed result encloses the exact and unknown result, the inclusion property, which is the main property of interval arithmetic, is satisfied and getting bit for bit identical results may not be crucial. Still, implementation issues may invalidate the inclusion property. Several ways to preserve the inclusion property are presented, on the example of the product of matrices with interval coefficients.
description: submitted to IEEE Transactions on Computers
Higher form Yang-Mills as higher BFYM theories
Creators: name: Song, Danhua
name: Lou, Kai
name: Wu, Ke
name: Yang, Jie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The YM theory has been generalized to 2YM and 3YM theories. Similarly, we generalize the BFYM theory to "2BFYM" and "3BFYM" theories. Then, we show that these higher BFYM theories can give the formulations of the corresponding higher form YM theories. Finally, we study the gauge symmetries of these higher BFYM theories.
Additional file 1 of Predicting falls in older adults: an umbrella review of instruments assessing gait, balance, and functional mobility
Creators: name: Beck Jepsen, D.
name: Robinson, K.
name: Ogliari, G.
name: Montero-Odasso, M.
name: Kamkar, N.
name: Ryg, J.
name: Freiberger, E.
name: Tahir, Masud
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Science Policy

description: Additional file 1. Search strategy in Medline database.
Compelling Friendship: Analyzing the Causes and Experiences of De Facto Slavery’s Persistence in Massachusetts in the Era of the American Revolution
Creators: name: Lewis, Brigitte
Publisher: name: University of Chicago
Year: 2023
Subjects: subject: Black Studies
subject: History of Black New Englanders
subject: De Facto Slavery
subject: African American History
subject: The American Revolution
subject: The American War for Independence
subject: Massachusetts
subject: Colonial Period
subject: New England Slavery
subject: Period of the Early Republic
subject: Slavery and Freedom in Massachusetts
subject: The Age of Revolutions
subject: 17th-19th centuries

description: This paper presents a case study of the relationship and lives of Henry Bromfield, a Massachusetts merchant, and Othello, an African man he enslaved in Massachusetts until his death in 1817, from the colonial, revolutionary, and early republic periods to interrogate how, why, and under what conditions de facto slavery persisted, unchallenged by local communities, into the 19th century in the interior of Massachusetts despite widespread recognized legal emancipation in the state and the largely actualized lived freedom of many formerly enslaved Black New Englanders. The paper is broken up into three sections; the first interrogates the beginnings of Othello’s and Henry Bromfield’s relationship and outlines the commercial and domestic worlds of Colonial Massachusetts they found themselves operating within and how slavery functioned in the colony; the second section focuses on their lives from 1770-1790 during the Revolutionary war years, and defines the motivations for Massachusetts colonists resort to armed revolt and declarations of independence, while also contextualizing how slavery and a tradition of Black resistance informed white colonists ideals of liberty and freedom, which offered ways for Black New Englanders to employ a myriad of tactics during the 1770s and 80s to morally and legally challenge slavery; the third section outlines how Black New Englanders were ablet to actualize legal emancipation while also shedding light on de facto slavery’s persistence in communities throughout the interior of Massachusetts by focusing on Henry and Othello’s lives post 1790 together in Harvard, MA and analyzing the intricacies and circumstances of their homo-platonic, intimate, long-term dependency and power dynamic riddled relationship that allowed a de facto slavery relationship between the two to persist unchallenged by the local community.
Self-Dual Tensors and Partial Supersymmetry Breaking in Five Dimensions
Creators: name: Grimm, Thomas W.
name: Kapfer, Andreas
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study spontaneous supersymmetry breaking of five-dimensional supergravity theories from sixteen to eight supercharges in Minkowski vacua. This N=4 to N=2 breaking is induced by Abelian gaugings that require the introduction of self-dual tensor fields accompanying the vectors in the gravity multiplet and vector multiplets. These tensor fields have first-order kinetic terms and can become massive by a Stueckelberg-like mechanism. We identify the general class of N=2 vacua and show how the N=4 spectrum splits into massless and massive N=2 multiplets. In particular, we find a massive gravitino multiplet, containing two complex massive tensors, and a number of massive tensor multiplets and hypermultiplets. We determine the resulting N=2 effective action for the massless multiplets obtained by integrating out massive fields. We show that the metric and Chern-Simons terms of the vectors are corrected at one-loop by massive tensors as well as spin-1/2 and spin-3/2 fermions. These contributions are independent of the supersymmetry-breaking scale and thus have to be included at arbitrarily low energies.
description: 33 pages
Towards the real-time evolution of gauge-invariant $\mathbb{Z}_2$ and $U(1)$ quantum link models on NISQ Hardware with error-mitigation
Creators: name: Huffman, Emilie
name: Vera, Miguel García
name: Banerjee, Debasish
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Practical quantum computing holds clear promise in addressing problems not generally tractable with classical simulation techniques, and some key physically interesting applications are those of real-time dynamics in strongly coupled lattice gauge theories. In this article, we benchmark the real-time dynamics of $\mathbb{Z}_2$ and $U(1)$ gauge invariant plaquette models using noisy intermediate scale quantum (NISQ) hardware, specifically the superconducting-qubit-based quantum IBM Q computers. We design quantum circuits for models of increasing complexity and measure physical observables such as the return probability to the initial state, and locally conserved charges. NISQ hardware suffers from significant decoherence and corresponding difficulty to interpret the results. We demonstrate the use of hardware-agnostic error mitigation techniques, such as circuit folding methods implemented via the Mitiq package, and show what they can achieve within the quantum volume restrictions for the hardware. Our study provides insight into the choice of Hamiltonians, construction of circuits, and the utility of error mitigation methods to devise large-scale quantum computation strategies for lattice gauge theories.
description: 20 pages, 15 figures
Important Notes on Lyapunov Exponents
Creators: name: Guan, Keying
Publisher: name: arXiv
Year: 2014
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 37c10, 37c70

description: It is shown that the famous Lyapunov exponents cannot be used as the numerical characteristic for distinguishing different kinds of attractors, such as the equilibrium point, the limit closed curve, the stable torus and the strange attractor.
description: 18 pages, 11 figures
Efficient Real-Time Fileless Malware Detection Tool For Macro-Based Microsoft Office Documents
Creators: name: Rahman, S M Aminur
Publisher: name: figshare
Year: 2023
Subjects: System and network security

description: Computer software, known as "malware," damages user data, computer systems, or business computer networks. Fileless malware is the latest upgradation within the malware taxonomy that cannot be detected using traditional antivirus or antimalware. Because of the attributes of this attack vector, fileless malware is popular among cybercriminals. The fileless malware carrier is the Microsoft Office document, a popular computer program worldwide. Cybercriminals use simple documents as fileless malware carriers and outbreak the target machine, which is a part of the cyber campaign. Non-technical users did not even know a simple document file could be a part of a massive cyberattack. This research paper demonstrates a proof of concept that can detect macro-enabled Microsoft Office documents that act as fileless malware with PowerShell script. The study proposed an artefact for malware detection and suspended the system to protect them from fileless malware. The artefact uses the logic of behavioural analysis to detect malicious activity and take action to isolate the infected systems from the rest of the network. The systems administrator was informed by a notification directed to perform memory forensics later. The tool was also tested with 35 fileless malware document samples and successfully detected fileless malware in less than five seconds. The proposed method demonstrates that this is a sustainable protection mechanism without using machine learning or an expensive solution.
$K_{5,5}$ is fully reconstructible in $\mathbb{C}^3$
Creators: name: Bernstein, Daniel Irving
name: Gortler, Steven J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Metric Geometry (math.MG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: A graph $G$ is fully reconstructible in $\mathbb{C}^d$ if the graph is determined from its $d$-dimensional measurement variety. The full reconstructibility problem has been solved for $d=1$ and $d=2$. For $d=3$, some necessary and some sufficient conditions are known and $K_{5,5}$ falls squarely within the gap in the theory. In this paper, we show that $K_{5,5}$ is fully reconstructible in $\mathbb{C}^3$.