cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stable Ferromagnetism and High Curie Temperature in VGe$_2$N$_4$
Creators: name: Li, Yingmei
name: Liu, Yong
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The discovery of monolayer MA$_2$Z$_4$ (M = transition metals; A = IVA elements; Z = VA elements, Science 369, 2020, 670-674) family has led another advance for facilitating and harnessing magnetism in low-dimensional materials. However, only Cr and V based MA$_2$N$_4$ compounds exhibit intrinsic magnetism yet with unsatisfied magnetic ordering temperature. Herein, we identify a stable ferromagnetic number of this family, i.e., VGe$_2$Z$_4$ monolayer, by means of first-principles calculations. It is found that the magnetic configuration sustains under both compression and tensile uniaxial in-plane strain, and the former can act as a positive modulator to enhance magnetic ordering temperature (Tc). Electronic structure calculations reveal a large band gap in the spin down channel while band-gapless in the spin up channel, an impressive near-half-metallic character, which is a favorable candidate for spintronic device.
description: 11 pages, 5 figures,Supporting Material
Stability of the replica-symmetric solution in the off-diagonally-disordered Bose-Hubbard model
Creators: name: Piekarska, Anna M.
name: Kopeć, Tadeusz K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study a disordered system of interacting bosons described by the Bose-Hubbard Hamiltonian with random tunneling amplitudes. We derive the condition for the stability of the replica-symmetric solution for this model. Following the scheme of de Almeida and Thouless, we determine if the solution corresponds to the minimum of free energy by building the respective Hessian matrix and checking its positive semidefiniteness. Thus, we find the eigenvalues by postulating the set of eigenvectors based on their expected symmetry, and require the eigenvalues to be non-negative. We evaluate the spectrum numerically and identify matrix blocks that give rise to eigenvalues that are always non-negative. Thus, we find a subset of eigenvalues coming from decoupled subspaces that is sufficient to be checked as the stability criterion. We also determine the stability of the phases present in the system, finding that the disordered phase is stable, the glass phase is unstable, while the superfluid phase has both stable and unstable parts.
description: 20 pages, 5 figures
The contribution of the mitochondrial genetic system to the biogenesis of the ATPase complex
Creators: name: Murphy., Mark
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Generalized para-Bose states
Creators: name: Pereira, A. S.
name: Lemos, A. S.
name: Brito, F. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we construct integrals of motion in a para-Bose formulation for a general time-dependent quadratic Hamiltonian, which, in its turn, commutes with the reflection operator. In this context, we obtain generalizations for the squeezed vacuum states (SVS) and coherent states (CS) in terms of the Wigner parameter. Furthermore, we show that there is a completeness relation for the generalized SVS owing to the Wigner parameter. In the study of the probability transition, we found that the displacement parameter acts as a transition parameter by allowing access to odd states, while the Wigner parameter controls the dispersion of the distribution. We show that the Wigner parameter is quantized by imposing that the vacuum state has even parity. We apply the general results to the case of the time-independent para-Bose oscillator and find that the mean values of the coordinate and momentum have an oscillatory behavior similarly to the simple harmonic oscillator, while the standard deviation presents corrections in terms of the squeeze, displacement, and Wigner parameters.
description: 32 pages, 5 figures, version accepted in EPJ Plus
Flavour Fields in Steady State: Stress Tensor and Free Energy
Creators: name: Banerjee, Avik
name: Kundu, Arnab
name: Kundu, Sandipan
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The dynamics of a probe brane in a given gravitational background is governed by the Dirac-Born-Infeld action. The corresponding open string metric arises naturally in studying the fluctuations on the probe. In Gauge-String duality, it is known that in the presence of a constant electric field on the worldvolume of the probe, the open string metric acquires an event horizon and therefore the fluctuation modes on the probe experience an effective temperature. In this article, we bring together various properties of such a system to a formal definition and a subsequent narration of the effective thermodynamics and the stress tensor of the corresponding flavour fields, also including a non-vanishing chemical potential. In doing so, we point out a potentially infinitely-degenerate scheme-dependence of regularizing the free energy, which nevertheless yields a universal contribution in certain cases. This universal piece appears as the coefficient of a log-divergence in free energy when a space-filling probe brane is embedded in AdS$_{d+1}$-background, for $d=2, 4$, and is related to conformal anomaly. For the special case of $d=2$, the universal factor has a striking resemblance to the well-known heat current formula in $(1+1)$-dimensional conformal field theory in steady-state, which endows a plausible physical interpretation to it. Interestingly, we observe a vanishing conformal anomaly in $d=6$.
description: 30 pages, one appendix
An Epistemic Approach to the Formal Specification of Statistical Machine Learning
Creators: name: Kawamoto, Yusuke
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Artificial Intelligence (cs.AI)
subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: We propose an epistemic approach to formalizing statistical properties of machine learning. Specifically, we introduce a formal model for supervised learning based on a Kripke model where each possible world corresponds to a possible dataset and modal operators are interpreted as transformation and testing on datasets. Then we formalize various notions of the classification performance, robustness, and fairness of statistical classifiers by using our extension of statistical epistemic logic (StatEL). In this formalization, we show relationships among properties of classifiers, and relevance between classification performance and robustness. As far as we know, this is the first work that uses epistemic models and logical formulas to express statistical properties of machine learning, and would be a starting point to develop theories of formal specification of machine learning.
description: Accepted in Software and Systems Modeling https://rdcu.be/b7ssR This paper is the journal version of the SEFM'19 conference paper arxiv:1907.10327
Time-dependent variational Monte Carlo study of the dynamic response of bosons in an optical lattice
Creators: name: Gartner, Mathias
name: Mazzanti, Ferran
name: Zillich, Robert E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the dynamics of a one-dimensional Bose gas at unit filling in both shallow and deep optical lattices and obtain the dynamic structure factor ${S(k,ω)}$ by monitoring the linear response to a weak probe pulse. We introduce a new procedure, based on the time-dependent variational Monte Carlo method (tVMC), which allows to evolve the system in real time, using as a variational model a Jastrow-Feenberg wave function that includes pair correlations. Comparison with exact diagonalization results of ${S(k,ω)}$ obtained on a lattice in the Bose-Hubbard limit shows good agreement of the dispersion relation for sufficiently deep optical lattices, while for shallow lattices we observe the influence of higher Bloch bands. We also investigate non-linear response to strong pulses. From the power spectrum of the density fluctuations we obtain the excitation spectrum, albeit broadened, by higher harmonic generation after a strong pulse with a single low wave number. As a remarkable feature of our simulations we furthermore demonstrate that the full excitation spectrum can be retrieved from the power spectrum of the density fluctuations due to the stochastic noise inherent in any Monte Carlo method, without applying an actual perturbation.
description: 12 pages, 3 figures
Large Charges on the Wilson Loop in $\mathcal{N}=4$ SYM: II. Quantum Fluctuations, OPE, and Spectral Curve
Creators: name: Giombi, Simone
name: Komatsu, Shota
name: Offertaler, Bendeguz
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We continue our study of large charge limits of the defect CFT defined by the half-BPS Wilson loop in planar $\mathcal{N}=4$ supersymmetric Yang-Mills theory. In this paper, we compute $1/J$ corrections to the correlation function of two heavy insertions of charge $J$ and two light insertions, in the double scaling limit where the charge $J$ and the 't Hooft coupling $λ$ are sent to infinity with the ratio $J/\sqrtλ$ fixed. Holographically, they correspond to quantum fluctuations around a classical string solution with large angular momentum, and can be computed by evaluating Green's functions on the worldsheet. We derive a representation of the Green's functions in terms of a sum over residues in the complexified Fourier space, and show that it gives rise to the conformal block expansion in the heavy-light channel. This allows us to extract the scaling dimensions and structure constants for an infinite tower of non-protected dCFT operators. We also find a close connection between our results and the semi-classical integrability of the string sigma model. The series of poles of the Green's functions in Fourier space corresponds to points on the spectral curve where the so-called quasi-momentum satisfies a quantization condition, and both the scaling dimensions and the structure constants in the heavy-light channel take simple forms when written in terms of the spectral curve. These observations suggest extensions of the results by Gromov, Schafer-Nameki and Vieira on the semiclassical energy of closed strings, and in particular hint at the possibility of determining the structure constants directly from the spectral curve.
description: 77 + 35 pages, 18 figures
The monocytic anti-inflammatory effect of high density lipoproteins
Creators: name: Murphy., Andrew James
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
Topology of multiple cross-linked Su-Schrieffer-Heeger chains
Creators: name: Sivan, A.
name: Orenstein, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In polymer science, cross-linking of polymer chains yields a substantially modified system compared to the one-dimensional constituent chains, due to the increase of dimensionality and effective seeding by defects (cross-linking sites). Inspired by this concept, we analyze topological features of a unit cell of a generalized topological mesh comprised of several one-dimensional Su-Schrieffer-Heeger (SSH) lattices cross-linked via a single site. The coupling site functions as a defect with protected states in the trivial regime and also induces edges inside the bulk with protected localized states centered around it in the topological regime. When more than two lattices are coupled by the defect, namely, a graph-dimensionality larger than one, the crossed chains support two types of localized eigenstates around the defect. One type is highly controllable by modifying the cross-linking strength, enabling broad tuning of eigenenergies from being submerged in the bulk band to becoming highly isolated and protected. We show that these unique features can be explained by an equivalence of the aforementioned system to an SSH chain coupled nonreciprocally to an external reservoir, yielding a unique pseudospectrum for both the bulk and localized states, with spatially symmetric eigenstates. Applying non-Hermiticity by adding gain and loss to alternating sites, relevant for example to a possible realization of topological coupled-laser fabric, we observe an abrupt transition of the topologically protected mid-gap state from anti-localized to localized near the defect. By changing the gain-loss parameters, we observe a cascaded spatial symmetry breaking of the supported states at exceptional points where parity-time symmetry is broken, for both the localized and the bulk states, exhibiting various novel phases.
description: 20 pages, 13 figures Reorganized paper and added robustness analysis for non-Hermitian setting, final version
Structure and decay pattern of linear-chain state in 14C
Creators: name: Baba, T.
name: Kimura, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The linear-chain states of $^{14}$C are theoretically investigated by using the antisymmetrized molecular dynamics. The calculated excitation energies and the $α$ decay widths of the linear-chain states were compared with the observed data reported by the recent experiments. The properties of the positive-parity linear-chain states reasonably agree with the observation, that convinces us of the linear-chain formation in the positive-parity states. On the other hand, in the negative-parity states, it is found that the linear-chain configuration is fragmented into many states and do not form a single rotational band. As a further evidence of the linear-chain formation, we focus on the $α$ decay pattern. It is shown that the linear-chain states decay to the excited states of daughter nucleus $^{10}{\rm Be}$ as well as to the ground state, while other cluster states dominantly decay into the ground state. Hence, we regard that this characteristic decay pattern is a strong signature of the linear-chain formation.
Necessary and sufficient conditions for asymptotically optimal linear prediction of random fields on compact metric spaces
Creators: name: Kirchner, Kristin
name: Bolin, David
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistics Theory (math.ST)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 62M20 (Primary) 60G12, 60G25, 60G60 (Secondary)

description: Optimal linear prediction (aka. kriging) of a random field $\{Z(x)\}_{x\in\mathcal{X}}$ indexed by a compact metric space $(\mathcal{X},d_{\mathcal{X}})$ can be obtained if the mean value function $m\colon\mathcal{X}\to\mathbb{R}$ and the covariance function $\varrho\colon\mathcal{X}\times\mathcal{X}\to\mathbb{R}$ of $Z$ are known. We consider the problem of predicting the value of $Z(x^*)$ at some location $x^*\in\mathcal{X}$ based on observations at locations $\{x_j\}_{j=1}^n$ which accumulate at $x^*$ as $n\to\infty$ (or, more generally, predicting $φ(Z)$ based on $\{φ_j(Z)\}_{j=1}^n$ for linear functionals $φ,φ_1,\ldots,φ_n$). Our main result characterizes the asymptotic performance of linear predictors (as $n$ increases) based on an incorrect second order structure $(\tilde{m},\tilde{\varrho})$, without any restrictive assumptions on $\varrho,\tilde{\varrho}$ such as stationarity. We, for the first time, provide necessary and sufficient conditions on $(\tilde{m},\tilde{\varrho})$ for asymptotic optimality of the corresponding linear predictor holding uniformly with respect to $φ$. These general results are illustrated by weakly stationary random fields on $\mathcal{X}\subset\mathbb{R}^d$ with Matérn or periodic covariance functions, and on the sphere $\mathcal{X}=\mathbb{S}^2$ for the case of two isotropic covariance functions.
description: 36 pages (including the supplement). To appear in Annals of Statistics
Relativistic Wind Farm Effect: Possibly Turbulent Flow of a Charged, Massless Relativistic Fluid in Graphene
Creators: name: Watson, Mark
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: At low Reynolds numbers, the wind flow in the wake of a single wind turbine is generally not turbulent. However, turbines in wind farms affect each other's wakes so that a turbulent flow can arise. In the present work, an analogue of this effect for the massless charge carrier flow around obstacles in graphene is outlined. We use a relativistic hydrodynamic simulation to analyze the flow in a sample containing impurities. Depending on the density of impurities in the sample, we indeed find evidence for potentially turbulent flow and discuss experimental consequences.
description: 7 pages, 9 figures
Exponential single server queues in an interactive random environment
Creators: name: Otten, Sonja
name: Krenzler, Ruslan
name: Daduna, Hans
name: Kruse, Karsten
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K25, 60K30, 60K37, 90B05, 90B22

description: We consider exponential single server queues with state-dependent arrival and service rates which evolve under influences of external environments. The transitions of the queues are influenced by the environment's state and the movements of the environment depend on the status of the queues (bi-directional interaction). The environment is constructed in a way to encompass various models from the recent Operations Research literature, where a queue is coupled with an inventory or with reliability issues. With a Markovian joint queueing-environment process we prove separability for a large class of such interactive systems, i.e. the steady state distribution is of product form and explicitly given. The queue and the environment processes decouple asymptotically and in steady state. For non-separable systems we develop ergodicity and exponential ergodicity criteria via Lyapunov functions. By examples we explain principles for bounding departure rates of served customers (throughputs) of non-separable systems by throughputs of related separable systems as upper and lower bound.
LLM and Data Repositories
Creators: name: Tykhonov, Vyacheslav
Publisher: name: Zenodo
Year: 2023
Subjects: dataverse
data repository
semantic web
llm
chatgpt
llama

description: Presentation for the CLARIAH Tech and Data Day on the decentralized research data infrastructure, LLM and Data Repositories. We're building distributed knowledge graph based on Dataverse data network producing structured data and providing provenance information which could be used as ground truth for the Machine Learning in general and Large Language Models specifically. This approach also allows deep integration of LLM with KG providing researchers with opportunities to "talk" to data just like to an assistant.
Searching for charmoniumlike states with hidden $s\bar{s}$
Creators: name: Liu, Xiao-Hai
name: Oka, Makoto
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the processes $e^+e^-$$\to$$γJ/ψϕ$, $γJ/ψω$ and $π^0 J/ψη$ to search for the charmnium-like states with hidden $s\bar{s}$, such as $Y(4140)$, $Y(4274)$, $X(4350)$ and $X(3915)$. These processes will receive contributions from the charmed-strange meson rescatterings. When the center-of-mass energies of the $e^+e^-$ scatterings are taken around the $D_{s0}(2317)D_s^{*}$, $D_{s1}(2460)D_s$ or $D_{s1}(2460)D_s^{*}$ threshold, the anomalous triangle singularities can be present in the rescattering amplitudes, which implies a non-resonance explanation about the resonance-like structures. The positions of the anomalous triangle singularities are sensitive to the kinematics, which offers us a criterion to distinguish the kinematic singularities from genuine particles.
description: 15 pages, 5 figures, 2 tables
Quantum interference of resonance fluorescence from Germanium-vacancy color centers in diamond
Creators: name: Chen, Disheng
name: Froech, Johannes
name: Ru, Shihao
name: Cai, Hongbing
name: Wang, Naizhou
name: Adamo, Giorgio
name: Scott, John
name: Li, Fuli
name: Zheludev, Nikolay
name: Aharonovich, Igor
name: Gao, Wei-bo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Resonance fluorescence from a quantum emitter is an ideal source to extract indistinguishable photons. By using the cross polarization to suppress the laser scattering, we observed resonance fluorescence from GeV color centers in diamond at cryogenic temperature. The Fourier-transform-limited linewidth emission with $T_2/2T_1\sim0.86$ allows for two-photon interference based on single GeV color center. Under pulsed excitation, the 24 ns separated photons exhibit a Hong-Ou-Mandel visibility of $0.604\pm0.022$, while the continuous-wave excitation leads to a coalescence time window of 1.05 radiative lifetime. Together with single-shot readout of spin states, it paves the way towards building a quantum network with GeV color centers in diamond.
description: 5 pages, 4 figures; Supplements 9 pages, 8 figures
Many-Body Localization in Translational Invariant Diamond Ladders with Flat Bands
Creators: name: Daumann, Mirko
name: Steinigeweg, Robin
name: Dahm, Thomas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The presence of flat bands is a source of localization in lattice systems. While flat bands are often unstable with respect to interactions between the particles, they can persist in certain cases. We consider a diamond ladder with transverse hopping that possesses such stable flat bands and show that many-body localization appears in the presence of interactions without quenched disorder. We numerically demonstrate that the eigenstate thermalization hypothesis is violated. We show that the influence of degenerate flat band states spreads across the full energy spectrum and grows extensively in the thermodynamic limit. Furthermore, we verify localization in terms of time evolution of some local observable, revival probability, participation ratio and entanglement entropy.
description: 8 pages, 8 figures, extended version
On the lattices of exact and weakly exact structures
Creators: name: Baillargeon, Rose-Line
name: Brüstle, Thomas
name: Gorsky, Mikhail
name: Hassoun, Souheila
Publisher: name: arXiv
Year: 2020
Subjects: subject: Category Theory (math.CT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13D30, 13D09, 18E10, 18G80

description: We initiate in this article the study of weakly exact structures, a generalization of Quillen exact structures. We introduce weak counterparts of one-sided exact structures and show that a left and a right weakly exact structure generate a weakly exact structure. We further define weakly extriangulated structures on an additive category $\mathcal{A}$ and characterize weakly exact structures among them. We investigate when these structures on $\mathcal{A}$ form lattices. We prove that the lattice of substructures of a weakly extriangulated structure is isomorphic to the lattice of topologizing subcategories of a certain functor category. In the idempotent complete case, we characterize the lattice of all weakly exact structures and we prove the existence of a unique maximal weakly exact structure. We study in detail the situation when $\mathcal{A}$ is additively finite, giving a module-theoretic characterization of closed sub-bifunctors of $\mbox{Ext}^1$ among all additive sub-bifunctors.
description: v1: 41 pages. v2: 43 pages, minor edits, Definition 6.10 and Section 7.7 added, Section 7.6 expanded. v3: 40 pages, minor edits, title changed, presentation improved. Lemmas 5.16 and 5.19 and references added. v4: An abridged version accepted to Journal of Algebra
Deuteron-induced nucleon transfer reactions within an ab initio framework: First application to p-shell nuclei
Creators: name: Raimondi, Francesco
name: Hupin, Guillaume
name: Navrátil, Petr
name: Quaglioni, Sofia
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Background: Low-energy transfer reactions in which a proton is stripped from a deuteron projectile and dropped into a target play a crucial role in the formation of nuclei in both primordial and stellar nucleosynthesis, as well as in the study of exotic nuclei using radioactive beam facilities and inverse kinematics. Ab initio approaches have been successfully applied to describe the $^3$H$(d,n)^4$He and $^3$He$(d,p)^4$He fusion processes. Purpose: An ab initio treatment of transfer reactions would also be desirable for heavier targets. In this work, we extend the ab initio description of $(d,p)$ reactions to processes with light $p$-shell nuclei. As a first application, we study the elastic scattering of deuterium on $^7$Li and the ${}^{7}$Li($d$,$p$)${}^{8}$Li transfer reaction based on a two-body Hamiltonian. Methods: We use the no-core shell model to compute the wave functions of the nuclei involved in the reaction, and describe the dynamics between targets and projectiles with the help of microscopic-cluster states in the spirit of the resonating group method. Results: The shape of the excitation functions for deuteron impinging on ${}^{7}$Li are qualitatively reproduced up to the deuteron breakup energy. The interplay between $d$-$^7$Li and $p$-$^8$Li particle-decay channels determines some features of the ${}^{9}$Be spectrum above the $d$+${}^{7}$Li threshold. Our prediction for the parity of the 17.298 MeV resonance is at odds with the experimental assignment Conclusions: Deuteron stripping reactions with $p$-shell targets can now be computed ab initio, but calculations are very demanding. A quantitative description of the ${}^{7}$Li($d$,$p$)${}^{8}$Li reaction will require further work to include the effect of three-nucleon forces and additional decay channels, and improve the convergence rate of our calculations.
description: 16 pages, 11 figures, submitted to Phys. Rev. C
Locality Sensitive Hashing with Extended Differential Privacy
Creators: name: Fernandes, Natasha
name: Kawamoto, Yusuke
name: Murakami, Takao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: Databases (cs.DB)
subject: Information Retrieval (cs.IR)
subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Extended differential privacy, a generalization of standard differential privacy (DP) using a general metric, has been widely studied to provide rigorous privacy guarantees while keeping high utility. However, existing works on extended DP are limited to few metrics, such as the Euclidean metric. Consequently, they have only a small number of applications, such as location-based services and document processing. In this paper, we propose a couple of mechanisms providing extended DP with a different metric: angular distance (or cosine distance). Our mechanisms are based on locality sensitive hashing (LSH), which can be applied to the angular distance and work well for personal data in a high-dimensional space. We theoretically analyze the privacy properties of our mechanisms, and prove extended DP for input data by taking into account that LSH preserves the original metric only approximately. We apply our mechanisms to friend matching based on high-dimensional personal data with angular distance in the local model, and evaluate our mechanisms using two real datasets. We show that LDP requires a very large privacy budget and that RAPPOR does not work in this application. Then we show that our mechanisms enable friend matching with high utility and rigorous privacy guarantees based on extended DP.
description: ESORICS 2021 (the 26th European Symposium on Research in Computer Security)
Electrical control over perpendicular magnetization switching driven by spin-orbit torques
Creators: name: Zhang, X.
name: Wan, C. H.
name: Yuan, Z. H.
name: Zhang, Q. T.
name: Wu, H.
name: Huang, L.
name: Kong, W. J.
name: Fang, C.
name: Khan, U.
name: Han, X. F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Flexible control of magnetization switching by electrical manners is crucial for applications of spin-orbitronics. Besides of a switching current that is parallel to an applied field, a bias current that is normal to the switching current is introduced to tune the magnitude of effective damping-like and field-like torques and further to electrically control magnetization switching. Symmetrical and asymmetrical control over the critical switching current by the bias current with opposite polarities is both realized in Pt/Co/MgO and $α$-Ta/CoFeB/MgO systems, respectively. This research not only identifies the influences of field-like and damping-like torques on switching process but also demonstrates an electrical method to control it.
description: 8 pages, 6 figures
Online Observer-Based Inverse Reinforcement Learning
Creators: name: Self, Ryan
name: Coleman, Kevin
name: Bai, He
name: Kamalapurkar, Rushikesh
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, a novel approach to the output-feedback inverse reinforcement learning (IRL) problem is developed by casting the IRL problem, for linear systems with quadratic cost functions, as a state estimation problem. Two observer-based techniques for IRL are developed, including a novel observer method that re-uses previous state estimates via history stacks. Theoretical guarantees for convergence and robustness are established under appropriate excitation conditions. Simulations demonstrate the performance of the developed observers and filters under noisy and noise-free measurements.
description: 7 pages, 3 figures
Three Party Quantum Networks Created by Quantum Cloning
Creators: name: Shukla, Manish Kumar
name: Huang, Minyi
name: Chakrabarty, Indranil
name: Wu, Junde
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: With progress in quantum technologies, the field of quantum networks has emerged as an important area of research. In the last few years, there has been substantial progress in understanding the correlations present in quantum networks. In this article, we study cloning as a prospective method to generate three party quantum networks which can be further used to create larger networks. We analyze various quantum network topologies that can be created using cloning transformations. This would be useful in the situations wherever the availability of entangled pairs is limited. In addition to that we focus on the problem of distinguishing networks created by cloning from those which are created by distributing independently generated entangled pairs. We find that there are several states which cannot be distinguished using the Finner inequalities in the standard way. For such states, we propose an extension to the existing Finner inequality for triangle networks by further increasing the number of observers from three to four or six depending on the network topology. This takes into account the additional correlations that exist in the case of cloned networks. In the last part of the article we have used tripartite mutual information to distinguish cloned networks from networks created by independent sources and have further used squashed entanglement as a measure to quantify the amount of dependence in the cloned networks.
description: 10 pages, 10 Figures
Negative result about the construction of genuinely entangled subspaces from unextendible product bases
Creators: name: Demianowicz, Maciej
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Unextendible product bases (UPBs) provide a versatile tool with various applications across different areas of quantum information theory. Their comprehensive characterization is thus of great importance and has been a subject of vital interest for over two decades now. An open question asks about the existence of UPBs, which are genuinely unextendible, i.e., they are not extendible even with biproduct vectors. In other words, the problem is to verify whether there exist genuinely entangled subspaces (GESs), subspaces composed solely of genuinely multiparty entangled states, complementary to UPBs. We solve this problem in the negative for many sizes of UPBs in different multipartite scenarios. In particular, in the all-important case of equal local dimensions, we show that there are always forbidden cardinalities for such UPBs, including the minimal ones corresponding to GESs of the maximal dimensions.
description: significantly revised, title changed, heterogeneous systems considered
Six-months outcome after fracture for working-age persons analyzed using the International Classification of Functioning, Disability, and Health – a prospective cohort observational study
Creators: name: Lindahl, Marianne
name: Teljigović, Sanel
name: Nielsen, Nina Odgaard
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Developmental Biology
subject: Science Policy
subject: Mental Health

description: Fractures following trauma affect physical and mental health for working-age persons, and the International Classification of Functioning, Disability, and Health (ICF) can help therapists understand the fractures’ impact on daily lives. To examine self-reported functioning and outcomes six months after upper and lower body fractures and compare limitations using the ICF. Data were collected from 160 patients with fractures as part of a prospective cohort study. The primary outcome measure was the Short Musculoskeletal Function Assessment questionnaire that covers all domains of the ICF. Moreover, sick leave, sense of coherence, and physical activity were reported. Six months after the injury, function had improved significantly, but patients reported problems on all domains in the ICF with few differences between the upper and lower body groups. Leisure activities caused problems for 63 (38.8%) of the patients and bothered 86 (53.8%). Problems performing work bothered 63 (39.4%) with no significant difference between the groups, although a significantly higher proportion in the upper body group had returned to work within two months (p < .001). Six months after fractures, adults reported problems on all ICF domains, especially on the participation dimension, which therapists should address in the rehabilitation process.
TransMIA: Membership Inference Attacks Using Transfer Shadow Training
Creators: name: Hidano, Seira
name: Murakami, Takao
name: Kawamoto, Yusuke
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cryptography and Security (cs.CR)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Transfer learning has been widely studied and gained increasing popularity to improve the accuracy of machine learning models by transferring some knowledge acquired in different training. However, no prior work has pointed out that transfer learning can strengthen privacy attacks on machine learning models. In this paper, we propose TransMIA (Transfer learning-based Membership Inference Attacks), which use transfer learning to perform membership inference attacks on the source model when the adversary is able to access the parameters of the transferred model. In particular, we propose a transfer shadow training technique, where an adversary employs the parameters of the transferred model to construct shadow models, to significantly improve the performance of membership inference when a limited amount of shadow training data is available to the adversary. We evaluate our attacks using two real datasets, and show that our attacks outperform the state-of-the-art that does not use our transfer shadow training technique. We also compare four combinations of the learning-based/entropy-based approach and the fine-tuning/freezing approach, all of which employ our transfer shadow training technique. Then we examine the performance of these four approaches based on the distributions of confidence values, and discuss possible countermeasures against our attacks.
description: IJCNN 2021 conference paper
Pairing symmetry of heavy fermion superconductivity in the two-dimensional Kondo-Heisenberg lattice model
Creators: name: Liu, Yu
name: Zhang, Guang-Ming
name: Yu, Lu
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In the two-dimensional Kondo-Heisenberg lattice model away from half-filled, the local antiferromagnetic exchange coupling can provide the pairing mechanism of quasiparticles via the Kondo screening effect, leading to the heavy fermion superconductivity. We find that the pairing symmetry \textit{strongly} depends on the Fermi surface (FS) structure in the normal metallic state. When $J_{H}/J_{K}$ is very small, the FS is a small hole-like circle around the corner of the Brillouin zone, and the s-wave pairing symmetry has a lower ground state energy. For the intermediate coupling values of $J_{H}/J_{K}$, the extended s-wave pairing symmetry gives the favored ground state. However, when $J_{H}/J_{K}$ is larger than a critical value, the FS transforms into four small hole pockets crossing the boundary of the magnetic Brillouin zone, and the d-wave pairing symmetry becomes more favorable. In that regime, the resulting superconducting state is characterized by either nodal d-wave or nodeless d-wave state, depending on the conduction electron filling factor as well. A continuous phase transition exists between these two states. This result may be related to the phase transition of the nodal d-wave state to a fully gapped state, which is recently observed in Yb doped CeCoIn$_{5}$.
description: 5 pages, 5 figures; published version
Equivalence of measures and asymptotically optimal linear prediction for Gaussian random fields with fractional-order covariance operators
Creators: name: Bolin, David
name: Kirchner, Kristin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Probability (math.PR)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 60G15 (Primary) 46N30, 60B05, 60G25 (Secondary)

description: We consider Gaussian measures $μ, \tildeμ$ on a separable Hilbert space, with fractional-order covariance operators $A^{-2β}$ resp. $\tilde{A}^{-2\tildeβ}$, and derive necessary and sufficient conditions on $A, \tilde{A}$ and $β, \tildeβ > 0$ for I. equivalence of the measures $μ$ and $\tildeμ$, and II. uniform asymptotic optimality of linear predictions for $μ$ based on the misspecified measure $\tildeμ$. These results hold, e.g., for Gaussian processes on compact metric spaces. As an important special case, we consider the class of generalized Whittle-Matérn Gaussian random fields, where $A$ and $\tilde{A}$ are elliptic second-order differential operators, formulated on a bounded Euclidean domain $\mathcal{D}\subset\mathbb{R}^d$ and augmented with homogeneous Dirichlet boundary conditions. Our outcomes explain why the predictive performances of stationary and non-stationary models in spatial statistics often are comparable, and provide a crucial first step in deriving consistency results for parameter estimation of generalized Whittle-Matérn fields.
description: 47 pages, 3 figures
Constraints on Planetesimal Collision Models in Debris Disks
Creators: name: MacGregor, Meredith A.
name: Wilner, David J.
name: Chandler, Claire
name: Ricci, Luca
name: Maddison, Sarah T.
name: Cranmer, Steven R.
name: Andrews, Sean M.
name: Hughes, A. Meredith
name: Steele, Amy
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Observations of debris disks offer a window into the physical and dynamical properties of planetesimals in extrasolar systems through the size distribution of dust grains. In particular, the millimeter spectral index of thermal dust emission encodes information on the grain size distribution. We have made new VLA observations of a sample of seven nearby debris disks at 9 mm, with 3" resolution and $\sim5$ $μ$Jy/beam rms. We combine these with archival ATCA observations of eight additional debris disks observed at 7 mm, together with up-to-date observations of all disks at (sub)millimeter wavelengths from the literature to place tight constraints on the millimeter spectral indices and thus grain size distributions. The analysis gives a weighted mean for the slope of the power law grain size distribution, $n(a)\propto a^{-q}$, of $\langle q \rangle = 3.36\pm0.02$, with a possible trend of decreasing $q$ for later spectral type stars. We compare our results to a range of theoretical models of collisional cascades, from the standard self-similar, steady-state size distribution ($q=3.5$) to solutions that incorporate more realistic physics such as alternative velocity distributions and material strengths, the possibility of a cutoff at small dust sizes from radiation pressure, as well as results from detailed dynamical calculations of specific disks. Such effects can lead to size distributions consistent with the data, and plausibly the observed scatter in spectral indices. For the AU Mic system, the VLA observations show clear evidence of a highly variable stellar emission component; this stellar activity obviates the need to invoke the presence of an asteroid belt to explain the previously reported compact millimeter source in this system.
description: 34 pages, 5 figures
On chromatic symmetric homology and planarity of graphs
Creators: name: Ciliberti, Azzurra
name: Moci, Luca
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Topology (math.AT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: Sazdanovic and Yip defined a categorification of Stanley's chromatic function called the chromatic symmetric homology. In this paper we prove that (as conjectured by Chandler, Sazdanovic, Stella and Yip), if a graph $G$ is non-planar, then its chromatic symmetric homology in bidegree (1,0) contains $\mathbb{Z}_2$-torsion. Our proof follows a recursive argument based on Kuratowsky's theorem.
description: 11 pages. Some changes have been made in Section 3 in order to improve readability. arXiv admin note: substantial text overlap with arXiv:1911.13297 by other authors
The effectiveness of comprehensive physiotherapy compared with corticosteroid injection on pain, disability, treatment effectiveness, and quality of life in patients with subacromial pain syndrome: a parallel, single-blind, randomized controlled trial
Creators: name: Daghiani, Maryam
name: Negahban, Hossein
name: Ebrahimzadeh, Mohammad Hosein
name: Moradi, Ali
name: Kachooei, Amir Reza
name: Raeesi, Javad
name: Divandari, Akram
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Neuroscience
subject: Ecology
subject: FOS: Biological sciences
subject: Mental Health

description: Comparing short- and long-term effects of comprehensive physiotherapy (CP) and subacromial corticosteroid injection (SCI) on pain, disability, and quality of life in the patients with subacromial pain syndrome (SAPS). 2 × 4 randomized controlled trial. 50 participants with unilateral SAPS. Random assignment with allocation concealment into two groups labeled as 12 sessions, supervised CP (n = 22) and 1cc triamhexal SCI (n = 25). Visual Analog Scale (VAS), Shoulder Pain and Disability Index (SPADI), shortened Disabilities of Arm, Shoulder and Hand (Quick-DASH), and Western Ontario Rotator Cuff Index (WORC). Outcomes were gathered pre- and post-intervention, with three- and six-month follow-ups. Variance analysis revealed that there was a significant interaction of group-in-time for SPADI and WORC (P < .05) but not for Quick-DASH and VAS (P > .05). The independent t-test analysis showed that the mean scores of all outcome measures in CP group were lesser than SCI group via 6 months (P < .05), except for the VAS (P > .05, mean difference = −0.97, 95% confidence interval −2.11–0.15). CP results in statistically significant and potentially clinically important difference in function and quality of the life at all timeframe. Moreover, there was no between group difference in order to reduce pain.
Tolerance induction and autoantibody detection in autoimmune disease
Creators: name: Murphy., Kim
Publisher: name: Monash University
Year: 2021

description: This thesis was scanned from the print manuscript for digital preservation and is copyright the author.
 Researchers can access this thesis by asking their local university, institution or public library to
 make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
$T\bar{T}$ Deformations in Curved Space from 4D Chern-Simons Theory
Creators: name: Py, Victor
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we shed new light onto $T\bar{T}$-deformations by engineering them on 2D surface defects, supporting chiral and antichiral CFT's, in a 4D Chern-Simons bulk. This approach is motivated by various connections between $T\bar{T}$-deformations, gravity and Chern-Simons theory and suggests that the formalism developed in this paper and the gravity picture of $T\bar{T}$-deformations should be closely related.
description: 18 pages, 4 figures; references added