cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Semi-nonparametric Latent Class Choice Model with a Flexible Class Membership Component: A Mixture Model Approach
Creators: name: Sfeir, Georges
name: Abou-Zeid, Maya
name: Rodrigues, Filipe
name: Pereira, Francisco Camara
name: Kaysi, Isam
Publisher: name: arXiv
Year: 2020
Subjects: subject: Econometrics (econ.EM)
subject: Machine Learning (cs.LG)
subject: Methodology (stat.ME)
subject: Machine Learning (stat.ML)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: This study presents a semi-nonparametric Latent Class Choice Model (LCCM) with a flexible class membership component. The proposed model formulates the latent classes using mixture models as an alternative approach to the traditional random utility specification with the aim of comparing the two approaches on various measures including prediction accuracy and representation of heterogeneity in the choice process. Mixture models are parametric model-based clustering techniques that have been widely used in areas such as machine learning, data mining and patter recognition for clustering and classification problems. An Expectation-Maximization (EM) algorithm is derived for the estimation of the proposed model. Using two different case studies on travel mode choice behavior, the proposed model is compared to traditional discrete choice models on the basis of parameter estimates' signs, value of time, statistical goodness-of-fit measures, and cross-validation tests. Results show that mixture models improve the overall performance of latent class choice models by providing better out-of-sample prediction accuracy in addition to better representations of heterogeneity without weakening the behavioral and economic interpretability of the choice models.
Electron Currents from Gradual Heating in Tilted Dirac Cone Materials
Creators: name: Moradpouri, A.
name: Torabian, M.
name: Jafari, S. A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Materials hosting tilted Dirac/Weyl fermions provide an emergent spacetime structure for the solid state physics. They admit a geometric description in terms of an effective spacetime metric. Using this metric that is rooted in the long-distance behavior of the underlying lattice, we formulate the hydrodynamic theory for tilted Dirac/Weyl materials in $2+1$ spacetime dimensions. We find that the mingling of space and time through the off-diagonal components of the metric gives rise to: (i) heat and electric currents in response to the $temporal$ gradient of temperature, $\partial_t T$ and (ii) a non-zero symmetric Hall-like conductance $σ^{ij}\propto ζ^iζ^j$ where $ζ^j$ parameterize the tilt in $j$'th space direction. The finding (i) above that can be demonstrated in the laboratory in state of the art cooling/heating rate settings, implies that the non-trivial emergent spacetime geometry in these materials empowers them with a fascinating capability to harvest the naturally available sources of $\partial_t T$ of hot deserts to produce electric energy. We further find a tilt-induced contribution to the conductivity which is an offspring of Drude pole and can be experimentally disentangled from the Drude pole itself.
Pinning dynamic systems of networks with Markovian switching couplings and controller-node set
Creators: name: Han, Yujuan
name: Lu, Wenlian
name: Li, Zhe
name: Chen, Tianping
Publisher: name: arXiv
Year: 2014
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: In this paper, we study pinning control problem of coupled dynamical systems with stochastically switching couplings and stochastically selected controller-node set. Here, the coupling matrices and the controller-node sets change with time, induced by a continuous-time Markovian chain. By constructing Lyapunov functions, we establish tractable sufficient conditions for exponentially stability of the coupled system. Two scenarios are considered here. First, we prove that if each subsystem in the switching system, i.e. with the fixed coupling, can be stabilized by the fixed pinning controller-node set, and in addition, the Markovian switching is sufficiently slow, then the time-varying dynamical system is stabilized. Second, in particular, for the problem of spatial pinning control of network with mobile agents, we conclude that if the system with the average coupling and pinning gains can be stabilized and the switching is sufficiently fast, the time-varying system is stabilized. Two numerical examples are provided to demonstrate the validity of these theoretical results, including a switching dynamical system between several stable sub-systems, and a dynamical system with mobile nodes and spatial pinning control towards the nodes when these nodes are being in a pre-designed region.
description: 9 pages; 3 figures
Exotic States in the Dynamical Casimir Effect
Creators: name: Benenti, Giuliano
name: Siccardi, Stefano
name: Strini, Giuliano
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider the interaction of a qubit with a single mode of the quantized electromagnetic field and show that, in the ultrastrong coupling regime and when the qubit-field interaction is switched on abruptly, the dynamical Casimir effect leads to the generation of a variety of exotic states of the field, which cannot be simply described as squeezed states. Such effect also appears when initially both the qubit and the field are in their ground state. The non-classicality of the obtained exotic states is characterized by means of a parameter based on the volume of the negative part of the Wigner function. A transition to non-classical states is observed by changing either the interaction strength or the interaction time. The observed phenomena appear as a general feature of nonadiabatic quantum gates, so that the dynamical Casimir effect can be the origin of a fundamental upper limit to the maximum speed of quantum computation and communication protocols.
description: 5 pages, 4 figures
A Critical Study on Data Leakage in Recommender System Offline Evaluation
Creators: name: Ji, Yitong
name: Sun, Aixin
name: Zhang, Jie
name: Li, Chenliang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Recommender models are hard to evaluate, particularly under offline setting. In this paper, we provide a comprehensive and critical analysis of the data leakage issue in recommender system offline evaluation. Data leakage is caused by not observing global timeline in evaluating recommenders, e.g., train/test data split does not follow global timeline. As a result, a model learns from the user-item interactions that are not expected to be available at prediction time. We first show the temporal dynamics of user-item interactions along global timeline, then explain why data leakage exists for collaborative filtering models. Through carefully designed experiments, we show that all models indeed recommend future items that are not available at the time point of a test instance, as the result of data leakage. The experiments are conducted with four widely used baseline models - BPR, NeuMF, SASRec, and LightGCN, on four popular offline datasets - MovieLens-25M, Yelp, Amazon-music, and Amazon-electronic, adopting leave-last-one-out data split. We further show that data leakage does impact models' recommendation accuracy. Their relative performance orders thus become unpredictable with different amount of leaked future data in training. To evaluate recommendation systems in a realistic manner in offline setting, we propose a timeline scheme, which calls for a revisit of the recommendation model design.
description: Accepted by TOIS
Single cell transcriptome analysis reveals discrete events during neural precursor cell differentiation into neuron
Creators: name: Rani, Satya Pavitra
Publisher: name: No Publisher Supplied
Year: 2018

description: Neurogenesis is a complex process which is controlled by intrinsic programs and exogenous signals among the cells resulting in formation of progressively committed neurons. The complex processes governing neurogenesis can be elucidated by determining the developmental stages and compositions of the cells along with their molecular determinants. The single cell RNA sequencing (scRNA-seq) study of undifferentiated neural precursor cells ultimately differentiating into neurons is an effort to understand these mechanisms. This study is performed on a dataset (GEO accession #GSE102066) consisting of four cell types, i.e., neural precursor cell, differentiating neural cell, immature neuron and neuron. A comprehensive analysis examining the trajectory path of neural precursor cells to neurons, the highest expressed genes and marker genes of each cell type and the gene ontology (GO) terms associated with these genes has revealed critical observations. Lack of similar intrinsic properties revealed heterogeneity among immature neurons and neurons through trajectory analysis. The genes which were expressed highest among all the cell types was associated with GO term for housekeeping genes which are crucial for maintaining cell functions. The marker genes of each cell type were associated with many relevant GO terms such as neurogenesis, neuron projection, olfactory lobe development, forebrain generation of neurons and central nervous system development. Key factors having discrete gene expression activity as cells transitioned from one state to another were revealed in this study. Genes which drastically decreased their expression levels over a period of two days (day 5 to day 7) were SFRP1 and SFRP2, genes which gradually decreased their expression activity from day 0 to day 30 were WNT5A and EFNA5, known neuronal marker genes DCX, MAP2 and STMN2 were upregulated gradually as the cells reached mature neuron stage. This study has helped in revealing transcriptional profiles of cells differentiating through a critical period of time with the key genes responsible for maintaining cell states and determining cell fates.
The National Outstanding Organization Award (OOA), the National Certificate of Honor, Peking, China. (Siming Zheng)
Creators: name: Siming Zheng
Publisher: name: figshare
Year: 2020
Subjects: subject: 150311 Organisational Behaviour
subject: FOS: Economics and business

description: Regarding this National Outstanding Organization Award, Certificates of Honor:I was on behalf of my Guangzhou University, South China Institute of Software Engineering and awarded by the first award with second prize of "National Honor of Certificate" on Jun 3, 2013. All the awarding activities were held in China Digital Science and Technology Museum (CDSTM) of Peking City, China.
Awarding Bodies:1). China Association for Science and Technology, Peking, China2). Department of Science and Technology, Ministry of Education, Peking, China3). Ministry of Education of the People's Republic of China, Peking, China4). Communist Youth League of China, Peking, China
Basis of Award: Election and Nomination.
Thank you for your attention.

Applicant name: Siming Zheng
Written date: Nov 20th, 2020.

Best regards.
Discussion: "A significance test for the lasso"
Creators: name: Lv, Jinchi
name: Zheng, Zemin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistics Theory (math.ST)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Discussion of "A significance test for the lasso" by Richard Lockhart, Jonathan Taylor, Ryan J. Tibshirani, Robert Tibshirani [arXiv:1301.7161].
description: Published in at http://dx.doi.org/10.1214/13-AOS1175D the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Loop corrections in Minkowski spacetime away from equilibrium. Part I. Late-time resummations
Creators: name: Chaykov, Spasen
name: Agarwal, Nishant
name: Bahrami, Sina
name: Holman, R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Loop corrections to unequal-time correlation functions in Minkowski spacetime exhibit secular growth due to a breakdown of time-dependent perturbation theory. This is analogous to secular growth in equal-time correlators on time-dependent backgrounds, except that in Minkowski the divergences must not signal a real IR issue. In this paper, we calculate the late-time limit of the two-point correlator for different massless self-interacting scalar quantum field theories on a Minkowski background. We first use a late-time version of the in-in path integral starting in the vacuum of the free theory; in this limit, the calculation, including UV renormalization, reduces to that in in-out. We find linear or logarithmic growth in time, depending on whether the interaction strength is dimension-one or dimensionless, respectively. We next develop the Weisskopf-Wigner resummation method, that proceeds by demanding unitarity within a truncated Hilbert space, to calculate the resummed correlator and find that it gives an exact exponentiation of the late-time perturbative result. The resummed (unequal-time) correlator thus decays with an exponential or polynomial time-dependence, which is suggestive of `universal' behavior that depends on the dimensions of the interaction strength.
description: 31 pages, 5 figures. Added discussion on resummation in in-out vs. WW. Matches published version
Exotic Monoidal Structures and Abstractly Automorphic Representations for $\mathrm{GL}(2)$
Creators: name: Dor, Gal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: Category Theory (math.CT)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 11F27 (Primary), 11F70, 18M05 (Secondary)

description: We use the theta correspondence to study the equivalence between Godement-Jacquet and Jacquet-Langlands L-functions for $\mathrm{GL}(2)$. We show that the resulting comparison is in fact an exotic symmetric monoidal structure on the category of $\mathrm{GL}(2)$-modules. Moreover, this enables us to construct an Abelian category of abstractly automorphic representations, whose irreducible objects are the usual automorphic representations. We speculate that this category is a natural setting for the study of automorphic phenomena for $\mathrm{GL}(2)$, and demonstrate its basic properties. This paper is a part of the author's thesis.
description: Expanded and clarified section 2
Loop corrections in Minkowski spacetime away from equilibrium. Part II. Finite-time results
Creators: name: Chaykov, Spasen
name: Agarwal, Nishant
name: Bahrami, Sina
name: Holman, R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Loop corrections to finite-time correlation functions in quantum field theories away from equilibrium can be calculated using the in-in path integral approach. In this paper, we calculate the unequal-time two-point correlator for different massless self-interacting scalar quantum field theories on a Minkowski background, starting the field evolution at an arbitrary initial time. We find the counterterms that need to be added to UV-renormalize the result, including usual in-out counterterms in the dynamics and additional initial state counterterms that are required to cancel all UV divergences. We find that the late-time limit of the renormalized correlation function exhibits a linear or logarithmic growth in time, depending on whether the interaction strength is dimension-one or dimensionless, respectively. The late-time correlations match those obtained in our companion paper and, as shown there, the divergences do not indicate a real IR issue, consistent with what one would expect in Minkowski.
description: 20 pages, 5 figures. Matches published version
Boolean algebras, Morita invariance, and the algebraic K-theory of Lawvere theories
Creators: name: Bohmann, Anna Marie
name: Szymik, Markus
Publisher: name: arXiv
Year: 2020
Subjects: subject: K-Theory and Homology (math.KT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 19D23 (Primary), 18F25, 18C10, 55P42 (secondary)

description: The algebraic K-theory of Lawvere theories is a conceptual device to elucidate the stable homology of the symmetry groups of algebraic structures such as the permutation groups and the automorphism groups of free groups. In this paper, we fully address the question of how Morita equivalence classes of Lawvere theories interact with algebraic K-theory. On the one hand, we show that the higher algebraic K-theory is invariant under passage to matrix theories. On the other hand, we show that the higher algebraic K-theory is not fully Morita invariant because of the behavior of idempotents in non-additive contexts: We compute the K-theory of all Lawvere theories Morita equivalent to the theory of Boolean algebras.
description: 22 pages. This updated paper discusses the work on Morita equivalence of Lawvere theories that appeared in version one. In order to better highlight the two separate directions of the results in that first version, the material on assembly maps has been incorporated into a second paper, arXiv:2112.07003. Revised version; to appear in Math. Proc. Cambridge Philos. Soc
Wetting critical behavior in the quantum Ising model within the framework of Lindblad dissipative dynamics
Creators: name: Artiaco, Claudia
name: Nava, Andrea
name: Fabrizio, Michele
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the critical behavior, both in space and time, of the wetting interface within the coexistence region around the first-order phase transition of a fully-connected quantum Ising model in slab geometry. For that, we employ the Lindblad master equation formalism in which temperature is inherited by the coupling to a dissipative bath, rather than being a functional parameter as in the conventional Cahn's free energy. Lindblad's approach gives not only access to the dissipative dynamics and steady-state configuration of the quantum wetting interface throughout the whole phase diagram but also shows that the wetting critical behavior can be successfully exploited to characterize the phase diagram as an alternative to the direct evaluation of the free energies of the competing phases.
description: 12 pages, 10 figures
Femtosecond pulse generation from a Topological Insulator mode-locked fiber laser
Creators: name: Liu, Hao
name: Zheng, Xu-Wu
name: Liu, Meng
name: Zhao, Nian
name: Luo, Ai-Ping
name: Luo, Zhi-Chao
name: Xu, Wen-Cheng
name: Zhang, Han
name: Zhao, Chu-Jun
name: Wen, Shuang-Chun
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We reported on the generation of femtosecond pulse in an anomalous-dispersion fiber ring laser by using a polyvinyl alcohol (PVA)-based Topological Insulator (TI), Bi2Se3 saturable absorber (SA). The PVA-TI composite has a low saturable optical intensity of 12 MW/cm2 and a modulation depth of ~3.9%. By incorporating the fabricated PVA-TISA into a fiber laser, mode-locking operation could be achieved at a low pump threshold of 25 mW. After an optimization of the cavity parameters, optical pulse with ~660 fs centered at 1557.5 nm wavelength had been generated. The experimental results demonstrate that the PVA could be an excellent host material for fabricating high-performance TISA, and also indicate that the filmy PVA-TISA is indeed a good candidate for ultrafast saturable absorption device.
description: 13 pages, 6 figures
Hypocoercivity and reaction-diffusion limit for a nonlinear generation-recombination model
Creators: name: Favre, Gianluca
name: Pirner, Marlies
name: Schmeiser, Christian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: A reaction-kinetic model for a two-species gas mixture undergoing pair generation and recombination reactions is considered on a flat torus. For dominant scattering with a non-moving constant-temperature background the macroscopic limit to a reaction-diffusion system is carried out. Exponential decay to equilibrium is proven for the kinetic model by hypocoercivity estimates. This seems to be the first rigorous derivation of a nonlinear reaction-diffusion system from a kinetic model as well as the first hypocoercivity result for a nonlinear kinetic problem without smallness assumptions. The analysis profits from uniform bounds of the solution in terms of the equilibrium velocity distribution.
Nonlocal Metric Realizations of MOND
Creators: name: Woodard, R. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: I discuss relativistic extensions of MOND in which the metric couples normally to matter. I argue that MOND might be a residual effect from the vacuum polarization of infrared gravitons produced during primordial inflation. If so, MOND corrections to the gravitational field equations would be nonlocal. Nonocality also results when one constructs metric field equations which reproduce the Tully-Fisher relation, along with sufficient weak lensing. I give the full field equations for the simplest class of models, and I specialize these equations to the geometries relevant for cosmology. I conclude by sketching the direction of future studies.
description: 23 pages, no figures, uses LaTeX2e, written for a special issue of the Canadian Journal of Physics devoted to MOND
On a conjecture of Khoroshkin and Tolstoy
Creators: name: Appel, Andrea
name: Gautam, Sachin
name: Wendlandt, Curtis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 81R10 (Primary) 17B37 (Secondary)

description: We prove a no-go theorem on the factorization of the lower triangular part in the Gaussian decomposition of the Yangian's universal $R$-matrix, yielding a negative answer to a conjecture of Khoroshkin and Tolstoy from [Lett. Math. Phys. vol. 36 1996].
description: 12 pages
D3.3 Initial release of the open-source libraries
Creators: name: Martiel, Simon
Publisher: name: Zenodo
Year: 2022
Subjects: open source
applications

description: This report summarizes deliverable 3.3: initial release of open-source libraries. Its goal is to provide an insight on the rationale behind the release of the open source libraries developed in the project and provide details on the various steps taken to help and coordinate these releases. Before diving into the technical details, let us introduce the methodology as specified in the initial proposal. The libraries will focus on circuit-based programming The programming language will be myQLM python (pyAQASM) Bull will act as the integrator of the libraries, as in Bull will notify developers when new bugs are introduced due to changes in the core quantum programming library Following the best practice in software engineering, continuous integration (CI) will be used. The CI platform is in place and operated by Bull. Every 4 months, the WP leaders and Bull will synchronize on the UC developments and will identify candidates for additional libraries, in full agreement with the partners who developed the code. During the project, the libraries (source codes and compiled) will be made public outside only once they have reached a correct level of integration quality. By default, no external contribution will be possible until the end of the project, in order to avoid disorganizing in the use case developments. External change requests may be allowed, but without any warranty The library source code is required to be documented and accompanied by application examples, accordingly to the standard coding best practices Points 6 and 7 are here to ensure best practice and user experience. Points 1 to 5 were decided during proposal redaction and ensure a uniformity of the released libraries: they are all supposed to rely on the same core package, thus allowing for interoperability between them. The currently released libraries are the following: NEASQC/FinancialApplications NEASQC/Variational_Algorithms NEASQC/ft-2-quantum-sat (corresponding to D6.6: QPSA Divide and quantum open source software) NEASQC/D4.2 (corresponding to D4.2: QCCC Alpha) NEASQC/WP6_QNLP (corresponding to D6.7: QNLP alpha prototype)
Bayesian Joint Chance Constrained Optimization: Approximations and Statistical Consistency
Creators: name: Jaiswal, Prateek
name: Honnappa, Harsha
name: Rao, Vinayak A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistics Theory (math.ST)
subject: Machine Learning (cs.LG)
subject: Optimization and Control (math.OC)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This paper considers data-driven chance-constrained stochastic optimization problems in a Bayesian framework. Bayesian posteriors afford a principled mechanism to incorporate data and prior knowledge into stochastic optimization problems. However, the computation of Bayesian posteriors is typically an intractable problem, and has spawned a large literature on approximate Bayesian computation. Here, in the context of chance-constrained optimization, we focus on the question of statistical consistency (in an appropriate sense) of the optimal value, computed using an approximate posterior distribution. To this end, we rigorously prove a frequentist consistency result demonstrating the convergence of the optimal value to the optimal value of a fixed, parameterized constrained optimization problem. We augment this by also establishing a probabilistic rate of convergence of the optimal value. We also prove the convex feasibility of the approximate Bayesian stochastic optimization problem. Finally, we demonstrate the utility of our approach on an optimal staffing problem for an M/M/c queueing model.
Lending a fist? Australia's new interventionism in the Southwest Pacific
Creators: name: Dinnen, Sinclair
Publisher: name: Canberra, ACT: State, Society and Governance in Melanesia (SSGM) Program, The Australian National University
Year: 2004
Subjects: ECP
Australia
interventionism
law and justice reform
strategic priorities
governance
security
stability
Australian aid program
RAMSI
Regional Australian Mission to the Solomon Islands
Enhanced Cooperation Program
Southwest Pacific
Papua New Guinea
Solomon Islands

description: [Conclusion]: In conclusion, Canberras renewed engagement with its Pacific neighbours is a welcome and timely development. A major window of opportunity has opened. There is a significant role for external assistance in helping address many of the difficulties experienced in parts of the region. The success to date of the Australian-led intervention in the Solomon Islands provides ample evidence of what can be achieved. At the same time, assistance needs to be grounded in a thorough understanding of the socio-economic and political complexities of the recipient countries. Outstanding challenges of governance require sustained engagement and are not susceptible to quick or easy solutions. Many aspects of the fragility of the postcolonial states in the Solomon Islands and PNG reflect their particular histories and the weakness of their articulation with their domestic societies. Current problems cannot simply be attributed to the mendacity of a handful of incompetent or corrupt leaders. Nor can they be resolved through an exclusive focus on strengthening the principal institutions of state. Non-state resources also need to be acknowledged and, where appropriate, mobilised in the larger processes of building state and nation. This requires that greater weight be given to local circumstances, knowledge and expertise. The most difficult challenge of all remains that of long-term sustainability.
Essential dimension of semisimple groups of type $B$
Creators: name: Baek, Sanghoon
name: Kim, Yeongjong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: We determine the essential dimension of an arbitrary semisimple group of type $B$ of the form \[G=\big(\operatorname{\mathbf{Spin}}(2n_{1}+1)\times\cdots \times \operatorname{\mathbf{Spin}}(2n_{m}+1)\big)/\boldsymbolμ\] over a field of characteristic $0$, for all $n_{1},\ldots, n_{m}\geq 7$, and a central subgroup $\boldsymbolμ$ of $\operatorname{\mathbf{Spin}}(2n_{1}+1)\times\cdots \times \operatorname{\mathbf{Spin}}(2n_{m}+1)$ not containing the center of $\operatorname{\mathbf{Spin}}(2n_i+1)$ as a direct factor. We also find the essential dimension of $G$ for each of the following cases, where either $n_{i}=1$ for all $i$ or $m=2$, $n_{1}=1$, $2\leq n_{2}\leq 3$, $\boldsymbolμ$ is the diagonal central subgroup for both cases.
$\mathcal{N}$IPM-HLSP: An Efficient Interior-Point Method for Hierarchical Least-Squares Programs
Creators: name: Pfeiffer, Kai
name: Escande, Adrien
name: Righetti, Ludovic
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Computational Complexity (cs.CC)
subject: Numerical Analysis (math.NA)
subject: Performance (cs.PF)
subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Hierarchical least-squares programs with linear constraints (HLSP) are a type of optimization problem very common in robotics. Each priority level contains an objective in least-squares form which is subject to the linear constraints of the higher priority levels. Active-set methods are a popular choice for solving them. However, they can perform poorly in terms of computational time if there are large changes of the active set. We therefore propose a computationally efficient primal-dual interior-point method (IPM) for dense HLSP's which is able to maintain constant numbers of solver iterations in these situations. We base our IPM on the computationally efficient nullspace method as it requires only a single matrix factorization per solver iteration instead of two as it is the case for other IPM formulations. We show that the resulting normal equations can be expressed in least-squares form. This avoids the formation of the quadratic Lagrangian Hessian and can possibly maintain high levels of sparsity. Our solver reliably solves ill-posed instantaneous hierarchical robot control problems without exhibiting the large variations in computation time seen in active-set methods.
On the modern deep learning approaches for precipitation downscaling
Creators: name: Kumar, Bipin
name: Atey, Kaustubh
name: Singh, Bhupendra Bahadur
name: Chattopadhyay, Rajib
name: Acharya, Nachiket
name: Singh, Manmeet
name: Nanjundiah, Ravi S.
name: Rao, Suryachandra A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Deep Learning (DL) based downscaling has become a popular tool in earth sciences recently. Increasingly, different DL approaches are being adopted to downscale coarser precipitation data and generate more accurate and reliable estimates at local (~few km or even smaller) scales. Despite several studies adopting dynamical or statistical downscaling of precipitation, the accuracy is limited by the availability of ground truth. A key challenge to gauge the accuracy of such methods is to compare the downscaled data to point-scale observations which are often unavailable at such small scales. In this work, we carry out the DL-based downscaling to estimate the local precipitation data from the India Meteorological Department (IMD), which was created by approximating the value from station location to a grid point. To test the efficacy of different DL approaches, we apply four different methods of downscaling and evaluate their performance. The considered approaches are (i) Deep Statistical Downscaling (DeepSD), augmented Convolutional Long Short Term Memory (ConvLSTM), fully convolutional network (U-NET), and Super-Resolution Generative Adversarial Network (SR-GAN). A custom VGG network, used in the SR-GAN, is developed in this work using precipitation data. The results indicate that SR-GAN is the best method for precipitation data downscaling. The downscaled data is validated with precipitation values at IMD station. This DL method offers a promising alternative to statistical downscaling.
Reuilding state and nation in Solomon Islands: policy options for the regional assistance mission
Creators: name: Hegarty, David
name: May, Ronald
name: Regan, Anthony
name: Nelson, Hank
name: Duncan, Ron
name: Dinnen, Sinclair
Publisher: name: Canberra, ACT: State, Society and Governance in Melanesia (SSGM) Program, The Australian National University
Year: 2004
Subjects: Regional Assistance Mission to the Solomon Islands
non-government organisations
economic development
rebuilding state and nation
law and order
policy options
internal conflict
Solomon Islands
RAMSI

description: This Discussion Paper was written as a contribution to policy deliberations on how the Regional Assistance Mission to Solomon Islands might assist the people and government of Solomon Islands rebuild their state and nation after years of divisive and debilitating internal conflict. Issues raised in the paper will have relevance for policy-makers, donor agencies and non-government organisations.
Optical absorption measurement of spin Berry curvature and spin Chern marker
Creators: name: Chen, Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In two-dimensional time-reversal symmetric topological insulators described by Dirac models, the ${\mathbb Z}_{2}$ topological invariant can be described by the spin Chern number. We present a linear response theory for the spin Berry curvature that integrates to the spin Chern number, and introduce its spectral function that can be measured at finite temperature by momentum- and spin-resolved circular dichroism, which may be achieved by pump-probe type of experiments using spin- and time-resolved ARPES. As a result, the sign of the Pfaffian of the ${\mathbb Z}_{2}$ invariant can be directly measured. The spin Chern number expressed in real space yields a spin Chern marker, whose spatial variation may be measured by circular dichroism and spin-resolved photoemission with a spatial resolution. A spin Chern correlator and a nonlocal spin Chern marker are further proposed to characterize the quantum criticality near topological phase transitions, which are shown to take the form of overlaps between spin-selected Wannier states.
description: 20 pages, 7 figures
Atomistic Potentials for Palladium-Silver Hydrides
Creators: name: Hale, L. M.
name: Wong, B. M.
name: Zimmerman, J. A.
name: Zhou, X.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: New EAM potentials for the ternary palladium-silver-hydrogen system are developed by extending a previously developed palladium-hydrogen potential. The ternary potentials accurately capture the heat of mixing and structural properties associated with solid solution alloys of palladium-silver. Stable hydrides are produced with properties that smoothly transition across the compositions. Additions of silver to palladium are predicted to alter the properties of the hydrides by decreasing the miscibility gap and increasing the likelihood of hydrogen atoms occupying tetrahedral interstitial sites over octahedral interstitial sites.
description: Accepted by Modelling and Simulation in Materials Science and Engineering
Approximating Fixed Points of Nonexpansive Mappings by a Faster Iteration Process
Creators: name: Kadioglu, Nazli
name: Yildirim, Isa
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47H09, 47H10

description: In this paper, we consider a new iteration process which is faster than all of Picard, Mann, Ishikawa and Agarwal et al. processes. We also prove some strong and weak convergence theorems for the class of nonexpansive mappings in Banach spaces.
Stability analysis of linear systems subject to regenerative switchings
Creators: name: Ogura, Masaki
name: Martin, Clyde F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: This paper investigates the stability of switched linear systems whose switching signal is modeled as a stochastic process called a regenerative process. We show that the mean stability of such a switched system is characterized by the spectral radius of a matrix. The matrix is obtained by taking the expectation of the transition matrix of the system on one cycle of the underlying regenerative process. The characterization generalizes Floquet's theorem for the stability analysis of linear time-periodic systems. We illustrate the result with the stability analysis of a linear system with a failure-prone controller under periodic maintenance.
Magneto-optical conductivity in the type-I and type-II phases of Weyl/multi-Weyl semimetals
Creators: name: Yadav, Shivam
name: Sekh, Sajid
name: Mandal, Ipsita
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magneto-optical conductivity is a very widely studied transport coefficient, useful to understand and characterize the behaviour of materials under magnetic fields. Using the Kubo formula, we compute the components of the conductivity tensor $σ_{μν}$ transverse to a uniform magnetic field $\mathbf B$, for a single node of a multi-Weyl semimetal (with monopole charge $J$ equal to two or three). We also include the results for a Weyl semimetal (with $J=1$), and identify peaks in the conductivity profile which were not reported in earlier studies. In our analysis, we explore how the tilting of the Weyl/multi-Weyl cone affects $σ_{μν}$, focussing on both type-I and type-II phases. All these systems have a linear-in-momentum dispersion along the tilting axis, which is chosen to align with $\mathbf B$. In the type-II phases, open Fermi pockets appear as artifacts of the low-energy effective continuum models, which ignore higher-order momentum terms of the actual bandstructures. Hence, we supplement the linear power term with a cubic term, which closes the Fermi pockets, thus eliminating any need for an ad hoc cutoff for the momentum integrals. Our results reveal that the absorptive parts of $σ_{μν}$ display multiple peaks as functions of the frequency, whose locations are determined by an energy scale $\sim |\mathbf B|^{J/2} $.
description: journal version
The Atlas3D project -- XXVII. Cold Gas and the Colours and Ages of Early-type Galaxies
Creators: name: Young, L. M.
name: Scott, N.
name: Serra, P.
name: Alatalo, K.
name: Bayet, E.
name: Blitz, L.
name: Bois, M.
name: Bournaud, F.
name: Bureau, M.
name: Crocker, A. F.
name: Cappellari, M.
name: Davies, R. L.
name: Davis, T. A.
name: de Zeeuw, P. T.
name: Duc, P. -A.
name: Emsellem, E.
name: Khochfar, S.
name: Krajnovic, D.
name: Kuntschner, H.
name: McDermid, R. M.
name: Morganti, R.
name: Naab, T.
name: Oosterloo, T.
name: Sarzi, M.
name: Weijmans, A. -M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a study of the cold gas contents of the Atlas3D early-type galaxies, in the context of their optical colours, near-UV colours, and Hβ absorption line strengths. Early-type (elliptical and lenticular) galaxies are not as gas-poor as previously thought, and at least 40% of local early-type galaxies are now known to contain molecular and/or atomic gas. This cold gas offers the opportunity to study recent galaxy evolution through the processes of cold gas acquisition, consumption (star formation), and removal. Molecular and atomic gas detection rates range from 10% to 34% in red sequence early-type galaxies, depending on how the red sequence is defined, and from 50% to 70% in blue early-type galaxies. Notably, massive red sequence early-type galaxies (stellar masses > 5e10 Msun, derived from dynamical models) are found to have HI masses up to M(HI)/Mstar ~ 0.06 and H_2 masses up to M(H$_2$)/Mstar ~ 0.01. Some 20% of all massive early-type galaxies may have retained atomic and/or molecular gas through their transition to the red sequence. However, kinematic and metallicity signatures of external gas accretion (either from satellite galaxies or the intergalactic medium) are also common, particularly at stellar masses <= 5e10 Msun, where such signatures are found in ~ 50% of H$_2$-rich early-type galaxies. Our data are thus consistent with a scenario in which fast rotator early-type galaxies are quenched former spiral galaxies which have undergone some bulge growth processes, and in addition, some of them also experience cold gas accretion which can initiate a period of modest star formation activity. We discuss implications for the interpretation of colour-magnitude diagrams.
description: 20 pages. Accepted for publication in MNRAS
Agrypnus coarctatus
Creators: name: Kotru, Akash
name: Chandran, Nithya
name: Dubey, Anil Kumar
name: Prosvirov, Alexander S.
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Elateridae
Agrypnus
Agrypnus coarctatus

description: Agrypnus coarctatus (Candèze, 1874)
Lacon coarctatus Candèze, 1874: 72.
Adelocera coarctatus (Candèze) Fleutiaux, 1926: 96.
Agrypnus coarctatus (Fleutiaux) Hayek, 1973: 140.
Type depository. Syntype (RBINS).
Type locality. “Himalaya”.
Distribution. India: Exact distribution not known. Elsewhere: Myanmar (Burma).
Literature. Candèze, (1874: 70): original description; Fleutiaux (1926: 96): combination; Hayek (1973: 140): combination.
description: Published as part of Kotru, Akash, Chandran, Nithya, Dubey, Anil Kumar & Prosvirov, Alexander S., 2025, A catalogue of Indian Agrypninae Candèze, 1857 (Coleoptera: Elateridae), pp. 1-66 in Zootaxa 5614 (1) on page 14, DOI: 10.11646/zootaxa.5614.1.1, http://zenodo.org/record/15217075
Multi-resonant open-access micro-cavity arrays for light matter interaction
Creators: name: Doherty, Thomas H.
name: Kuhn, Axel
name: Kassa, Ezra
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the realisation of a high-finesse open-access cavity array, tailored towards the creation of multiple coherent light-matter interfaces within a compact environment. We describe the key technical developments put in place to fabricate such a system, comprising the creation of tapered pyramidal substrates and an in-house laser machining setup. Cavities made from these mirrors are characterised, by laser spectroscopy, to possess similar optical properties to state-of-the-art fibre-tip cavities, but offer a compelling route towards improved performance, even when used to support only a single mode. The implementation of a 2 by 2 cavity array and the independent frequency tuning between at least three neighbouring sites are demonstrated.
Relativistic theory of surficial Love numbers
Creators: name: Landry, Philippe
name: Poisson, Eric
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A relativistic theory of surficial Love numbers, which characterize the surface deformation of a body subjected to tidal forces, was initiated by Damour and Nagar. We revisit this effort in order to extend it, clarify some of its aspects, and simplify its computational implementation. First, we refine the definition of surficial Love numbers proposed by Damour and Nagar, and formulate it directly in terms of the deformed curvature of the body's surface, a meaningful geometrical quantity. Second, we develop a unified theory of surficial Love numbers that applies equally well to material bodies and black holes. Third, we derive a compactness-dependent relation between the surficial and (electric-type) gravitational Love numbers of a perfect-fluid body, and show that it reduces to the familiar Newtonian relation when the compactness is small. And fourth, we simplify the tasks associated with the practical computation of the surficial and gravitational Love numbers for a material body.
description: 12 pages, 2 figures
Discussion: "A significance test for the lasso"
Creators: name: Wasserman, Larry
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistics Theory (math.ST)
subject: Methodology (stat.ME)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Discussion of "A significance test for the lasso" by Richard Lockhart, Jonathan Taylor, Ryan J. Tibshirani, Robert Tibshirani [arXiv:1301.7161].
description: Published in at http://dx.doi.org/10.1214/13-AOS1175E the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Nematic, topological and Berry phases when a flat and a parabolic band touch
Creators: name: Dóra, Balázs
name: Herbut, Igor F.
name: Moessner, Roderich
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: A (single flavor) quadratic band crossing in two dimensions is known to have a generic instability towards a quantum anomalous Hall (QAH) ground state for infinitesimal repulsive interactions. Here we introduce a generalization of a quadratic band crossing which is protected only by rotational symmetry. By focusing on the representative case of a parabolic and flat band touching, which also allows for a straightforward lattice realization, the interaction induced nematic phase is found generally to compete successfully with the QAH insulator, and to become the dominant instability in certain parts of the phase diagram already at weak coupling. The full phase diagram of the model, together with its topological properties, is mapped out using a perturbative renormalization group, strong coupling analysis, the mean-field theory. Interestingly, the Berry flux varies continuously in the single flavour limit with various control parameters.
description: 5 pages, 3 figures