cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Expressibility-Enhancing Strategies for Quantum Neural Networks (Slides)
Creators: Dr. Junpeng Zhan
Publisher: name: IEEE
Year: 2023

Quantum computing, whether it is quantum computer hardware or quantum algorithms, has been developing rapidly recently. It has the potential to solve challenging scientific and engineering problems that cannot be efficiently solved by classical computers. Deep learning has become very powerful in many important areas, but it can involve an extremely large number of parameters, making the training very challenging. Quantum machine learning, especially quantum neural networks, has the potential to solve this problem, although it is still in its infancy. The speaker will first briefly introduce the basic concepts of quantum computing, and then discuss our recent work on strategies to enhance the expressibility of quantum neural networks. These strategies could make our quantum neural network more suitable for power system applications. Time permitting, the speaker will also briefly describe his recent work on developing quantum algorithms for NP-complete problems, an extremely important but unsolved problem in computer science and mathematics.

Who would benefit from this webinar:
Undergraduate and graduate students, researchers, engineers
Quantum computing, whether it is quantum computer hardware or quantum algorithms, has been developing rapidly recently. It has the potential to solve challenging scientific and engineering problems that cannot be efficiently solved by classical computers. Deep learning has become very powerful in many important areas, but it can involve an extremely large number of parameters, making the training very challenging. Quantum machine learning, especially quantum neural networks, has the potential to solve this problem, although it is still in its infancy. The speaker will first briefly introduce the basic concepts of quantum computing, and then discuss our recent work on strategies to enhance the expressibility of quantum neural networks. These strategies could make our quantum neural network more suitable for power system applications. Time permitting, the speaker will also briefly describe his recent work on developing quantum algorithms for NP-complete problems, an extremely important but unsolved problem in computer science and mathematics.

Who would benefit from this webinar:
Undergraduate and graduate students, researchers, engineers
ISGT 16 Tutorial: Synchrophasor Technology Applications in Distribution Systems (Slides)
Creators: Y. Hu
J. Aguero Romero
E. Udren
F. Katiraei
Publisher: name: IEEE
Year: 2016

This tutorial will review: � Distribution system overview � Synchrophasor technology overview � Application of synchrophasor technology in distribution systems � Implementation and technology � Case studies
This tutorial will review:
� Distribution system overview
� Synchrophasor technology overview
� Application of synchrophasor technology in distribution systems
� Implementation and technology
� Case studies
Suppression of unbounded gradients in a SDE associated with the Burgers equation
Creators: name: Albeverio, Sergio
name: Rozanova, Olga
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 35R60

description: We consider the Langevin equation describing a stochastically perturbed by uniform noise non-viscous Burgers fluid and introduce a deterministic function that corresponds to the mean of the velocity when we keep the value of position fixed. We study interrelations between this function and the solution of the non-perturbed Burgers equation. Especially we are interested in the property of the solution of the latter equation to develop unbounded gradients within a finite time. We study the question how the initial distribution of particles for the Langevin equation influences this blowup phenomenon. It is shown that for a wide class of initial data and initial distributions of particles the unbounded gradients are eliminated. The case of a linear initial velocity is particular. We show that if the initial distribution of particles is uniform, then the mean of the velocity for a given position coincides with the solution of the Burgers equation and in particular does not depend on the constant variance of the stochastic perturbation. Further, for a one space space variable we get the following result: if the decay rate of the power-behaved initial particles distribution at infinity is greater or equal $|x|^{-2},$ then the blowup is suppressed, otherwise, the blowup takes place at the same moment of time as in the case of the non-perturbed Burgers equation.
description: 9 pages, submitted Minor change in the abstract, minor correction in the computations, discussion added, accepted in Proc.Amer.Math.Soc
Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $α-$(BETS)$_{2}$I$_{3}$
Creators: name: Kawasugi, Yoshitaka
name: Masuda, Hikaru
name: Uebe, Masashi
name: Yamamoto, Hiroshi M.
name: Kato, Reizo
name: Nishio, Yutaka
name: Tajima, Naoya
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on the Shubnikov de Haas (SdH) oscillations in the quasi two-dimensional molecular conductor $α-$(BETS)$_{2}$I$_{3}$ [BETS: bis(ethylenedithio)tetraselenafulvalene] laminated on polyimide films at 1.7 K. From the SdH phase factor, we verified experimentally that the material is in the Dirac fermion phase under pressure. $α-$(BETS)$_{2}$I$_{3}$ is in the vicinity of the phase transition between strongly correlated insulating and Dirac fermion phases, and is a possible candidate for an ambient-pressure molecular Dirac fermion system. However, the SdH oscillations indicate that the Berry phase is zero at ambient pressure. Under pressure, a $π$ Berry phase emerges when the metal-insulator crossover is almost suppressed at $\sim$0.5 GPa. The results contrast those for the pioneering molecular Dirac fermion system $α-$(BEDT-TTF)$_{2}$I$_{3}$ [BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene] in which Dirac fermions and semiconducting behavior are simultaneously observed.
description: 12 pages, 10 figures, including Supplemental Material
ISGT 16 Tutorial: DER Integration Course Impacts on T&D (Slides)
Creators: D. Lovelady
Publisher: name: IEEE
Year: 2016

This tutorial will review:
1. Traditional T&D Planning
2. DER Definition, Technologies
3. DER System Impacts
4. Limitations with Traditional Planning considering DER
5. Future Planning Techniques
This tutorial will review:
1. Traditional T&D Planning
2. DER Definition, Technologies
3. DER System Impacts
4. Limitations with Traditional Planning considering DER
5. Future Planning Techniques
Slides for: Novel Prospects of Image Restoration Inspired by Concepts of Quantum Mechanics
Creators: Mr. Sayantan Dutta
Publisher: name: IEEE
Year: 2023

Slides for: SPS Webinar, 9 March 2023, Mr. Sayantan Dutta
Decomposition of digital images into other basis or dictionaries than time or space domains is a very common and effective approach in image processing and analysis. Such a decomposition is commonly obtained using fixed transformations (e.g., Fourier or wavelet) or dictionaries learned from example databases or from the signal or image itself. In recent years, with the growth of computing power, data-driven strategies exploiting the redundancy within patches extracted from one or several images to increase sparsity have become more prominent. They have demonstrated very promising image restoration results. The question to pursue in this work is how to design such an adaptive transformation based on principles of quantum mechanics.

We investigate in detail a new approach of constructing such a signal or image-dependent bases inspired by quantum mechanics tools, i.e., by considering the signal or image as a potential in the discretized Schrodinger equation. To illustrate the potential of the proposed decomposition, denoising results are reported in the case of Gaussian, Poisson, and speckle noise and compared to the state of the art algorithms. We further generalize our proposed adaptive basis by exploiting the data-driven strategy inspired by quantum many-body theory. Based on patch analysis, the similarity measures in a local image neighborhood are formalized through a term akin to interaction in quantum mechanics that can efficiently preserve the local structures of real images.

The versatile nature of this adaptive basis extends the scope of its application to image independent or image-dependent noise scenarios without any adjustment. We carry out a rigorous comparison with contemporary methods to demonstrate the denoising capability of the proposed algorithm regardless of the image characteristics, noise statistics and intensity. We show the ability of our approaches to deal with real-medical data such as clinical dental computed tomography image denoising and medical ultrasound image despeckling applications.
LATEST RESULTS FROM THE CUORE EXPERIMENT
Creators: name: G. Fantini
Publisher: name: Zenodo
Year: 2021
Subjects: Neutrino Masses and Mixing - Double Beta Decays and Neutrino

description: Parallel Contributed Talk at the
 "XIX International Workshop on Neutrino Telescopes"
 on line - 18-26 February, 2021
description: CUORE Collaboration
Slides for: Power Scaling of Uplink Massive MIMO Systems with Arbitrary-Rank Channel Means
Creators: Dr. Qi Zhang
Publisher: name: IEEE
Year: 2023

Slides for: SPS Webinar, 8 March 2023, Dr. Qi Zhang
This webinar will investigate the uplink achievable rates of massive multiple-input multiple-output (MIMO) antenna systems in Ricean fading channels, using maximal-ratio combining (MRC) and zero-forcing (ZF) receivers, assuming perfect and imperfect channel state information (CSI). In contrast to previous relevant works, the fast-fading MIMO channel matrix is assumed to have an arbitrary-rank deterministic component as well as a Rayleigh-distributed random component. We derive tractable expressions for the achievable uplink rate in the large-antenna limit, along with approximating results that hold for any finite number of antennas. Based on these analytical results, we obtain the scaling law that the users� transmit power should satisfy, while maintaining a desirable quality of service. In particular, it is found that regardless of the Ricean K-factor, in the case of perfect CSI, the approximations converge to the same constant value as the exact results, as the number of base station antennas (M) grows large, while the transmit power of each user can be scaled down proportionally to 1/M. If CSI is estimated with uncertainty, the same result holds true but only when the Ricean K-factor is non-zero. Otherwise, if the channel experiences Rayleigh fading, we can only cut the transmit power of each user proportionally to 1/?M. In addition, we show that with an increasing Ricean K-factor, the uplink rates will converge to fixed values for both MRC and ZF receivers.
The GERDA experiment - on the search for neutrinoless double-beta decay
Creators: name: T. Comellato
Publisher: name: Zenodo
Year: 2021
Subjects: Neutrino Masses and Mixing - Double Beta Decays and Neutrino

description: Parallel Contributed Talk at the
 "XIX International Workshop on Neutrino Telescopes"
 on line - 18-26 February, 2021
description: on behalf of the GERDA collaboration
A modified Next Reaction Method for simulating chemical systems with time dependent propensities and delays
Creators: name: Anderson, David F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Quantitative Methods (q-bio.QM)
subject: FOS: Biological sciences

description: Chemical reaction systems with a low to moderate number of molecules are typically modeled as discrete jump Markov processes. These systems are oftentimes simulated with methods that produce statistically exact sample paths such as the Gillespie Algorithm or the Next Reaction Method. In this paper we make explicit use of the fact that the initiation times of the reactions can be represented as the firing times of independent, unit rate Poisson processes with internal times given by integrated propensity functions. Using this representation we derive a modified Next Reaction Method and, in a way that achieves efficiency over existing approaches for exact simulation, extend it to systems with time dependent propensities as well as to systems with delays.
description: 25 pages, 1 figure. Some minor changes made to add clarity
Terahertz Room-Temperature Photonic Crystal Nanocavity Laser
Creators: name: Englund, Dirk
name: Altug, Hatice
name: Fushman, Ilya
name: Vuckovic, Jelena
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We describe an efficient surface-passivated photonic crystal nanocavity laser, demonstrating room-temperature operation with 3-ps total pulse duration (detector response limited) and low-temperature operation with ultra-low-threshold near 9uW.
description: 6 pages, 3 figures
Velocity difference of ions and neutrals in solar prominences
Creators: name: Wiehr, Eberhard
name: Stellmacher, Goetz
name: Balthasar, Horst
name: Bianda, Michele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Marked velocity excesses of ions relative to neutrals are obtained from two time series of the neighboring emission lines He I 5015 and Fe II 5018 in a quiescent prominence. Their Doppler shifts show time variations of quasi-periodic character where the ions are faster than the neutrals 1.0 < V_macro(Fe II)/V_macro(He I) < 1.35 in series-A and, respectively, <1.25 in series-B. This 'ratio excess' confirms our earlier findings of a 1.22 ion velocity excess, but the present study shows a restriction in space and time of typically 5 Mm and 5 min. The ratio excess is superposed by a time and velocity independent 'difference excess' -0.3 < V_macro(Fe II)-V_macro(He I) < +0.7 km/s in series-A (also indicated in series-B). The high repetition rate of 3.9 sec enables the detection of high frequency oscillations with several damped 22 sec periods in series-A. These show a ratio excess with a maximum of 1.7. We confirm the absence of a significant phase delay of He neutrals with respect to the Fe ions.
description: 6 pages, 11 figures
Status of the Majorana Demonstrator - A search for 0νββ in 76Ge and other physics beyond the standard model
Creators: name: Guinn, Ian
Publisher: name: Zenodo
Year: 2021
Subjects: Neutrino Masses and Mixing - Double Beta Decays and Neutrino

description: Parallel Contributed Talk at the
 "XIX International Workshop on Neutrino Telescopes"
 on line - 18-26 February, 2021
description: on behalf of the MAJORANA Collaboration
Automatically generating models of IT systems
Creators: name: Kovačević, Ivan
name: Groš, Stjepan
name: Đerek, Ante
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Information technology system (ITS), informally, consists of hardware and software infrastructure (e.g., workstations, servers, laptops, installed software packages, databases, LANs, firewalls, etc.), along with physical and logical connections and inter-dependencies between various items. Nowadays, every company owns and operates an ITS, but detailed information about the system is rarely publicly available. However, there are many situations where the availability of such data would be beneficial. For example, cyber ranges need descriptions of complex realistic IT systems in order to provide an effective training and education platform. Furthermore, various algorithms in cybersecurity, in particular attack tree generation, need to be validated on realistic models of IT systems. In this paper, we describe a system we call the Generator that, based on the high-level requirements such as the number of employees and the business area the target company belongs to, generates a model of an ITS that satisfies the given requirements. We put special emphasis on the following two criteria: the generated ITS models a large amount of details, and ideally resembles a real system. Our survey of related literature found no sufficiently similar prior works, so we believe that this is the first attempt of building something like this. We created a proof-of-concept implementation of the Generator, validated it by generating ITS models for a simplified fictional financial institution, and analyzed the Generators performance with respect to the problem size. The research was done in an iterative manner, with coauthors continuously providing feedback on intermediate results. (...) We intend to extend this prototype to allow probabilistic generation of IT systems when only a subset of parameters is explicitly defined, and further develop and validate our approach with the help of domain experts.
description: 20 pages, 16 figures
10 recommendations to make your training materials FAIRer
Creators: name: Garcia, Leyla
name: Batut, Bérénice
name: Kuzak, Mateusz
name: Arcila, Ricardo
name: Beard, Niall
name: Burke, Melissa
name: Carvalho-Silva, Denise
name: Angel, Victoria Dominguez Del
name: Gurwitz, Kim
name: Kahlem, Pascal
name: Martinez, Paula
name: Morgan, Sarah
name: McQuilton, Peter
name: Palagi, Patricia
name: Psomopoulos, Fotis
name: Rustici, Gabriella
Publisher: name: F1000 Research Limited
Year: 2019

description: Findable, Accessible, Interoperable and Reusable (FAIR) principles provide a framework of minimum elements required for effective management of digital resources. Some of the main aspects are: persistent and global identification, licensing and longevity commitment policies. Using metadata is one of the FAIR pillars; however, metadata requirements can vary from one digital resource to another, making the implementation of the FAIR principles challenging. For example, rich descriptions using a plurality of attributes and meeting community standards can be found without further clarification. The ELIXIR Training Platform established a FAIR-focused working group opened to participants from 23 ELIXIR nodes. Here, we report on 10 recommendations to make your training materials FAIRer. We consider for Findability, keywords, versioning and publication in specialized registries; for Accessibility, using public repositories together with clear access and contribution rules; for Interoperability, references to other elements used or related to the training material as well as trainee-oriented elements such as learning outcomes, prerequisites, and required skills; for Reusability, license, citation and contact details plus some trainer-oriented elements such as audience, instructions and easy-to-reuse formats, e.g. markdown rather than PDF. This effort will contribute to FAIRness for people (trainers, trainees) and machines for the benefit of science.
Theory of a continuous Mott transition in two dimensions
Creators: name: Senthil, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study theoretically the zero temperature phase transition in two dimensions from a Fermi liquid to a paramagnetic Mott insulator with a spinon Fermi surface. We show that the approach to the bandwidth controlled Mott transition from the metallic side is accompanied by a vanishing quasiparticle residue and a diverging effective mass. The Landau parameters $F^0_s, F^0_a$ also diverge. Right at the quantum critical point there is a sharply defined `critical Fermi surface' but no Landau quasiparticle. The critical point has a $Tln\frac{1}{T}$ specific heat and a non-zero $T = 0$ resistivity. We predict an interesting {\em universal resistivity jump} in the residual resistivity at the critical point as the transition is approached from the metallic side. The crossovers out of the critical region are also studied. Remarkably the initial crossover out of criticality on the metallic side is to a Marginal Fermi Liquid metal. At much lower temperatures there is a further crossover into the Landau Fermi liquid. The ratio of the two crossover scales vanishes on approaching the critical point. Similar phenomena are found in the insulating side. The filling controlled Mott transition is also studied. Implications for experiments on the layered triangular lattice organic material $κ-(ET)_2Cu_2(CN)_3$ are discussed.
description: 14 pages, 4 figures
Probing the tau electric dipole moment at BEPC-II collider energies
Creators: name: Bernreuther, Werner
name: Chen, Long
name: Nachtmann, Otto
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We investigate the prospects of the search for a nonzero $τ$ EDM form factor $d_τ(s)$ in $τ$ pair production by $e^+ e^-$ collisions at BEPC-II collider energies. We compute the expectation values and covariances of simple and optimal $CP$-odd observables for $τ$-pair production at $\sqrt{s}=4.18$ GeV and $4.95$ GeV with subsequent decays of $τ^\pm$ into major leptonic or semihadronic modes. For the $τ$ decays to two pions and three charged pions we take the full kinematic information of the hadronic system into account. Applying cuts and using realistic assumptions on the eventually attainable integrated luminosities at these energies, ${\cal L}(4.18) = 3\times 10^4~{\rm pb}^{-1}$ and ${\cal L}(4.95) = 10^4~{\rm pb}^{-1}$, respectively, we find the following. By taking into account purely semihadronic and semihadronic-leptonic $τ^+τ^-$ decays one can achieve with optimal $CP$-odd observables the 1 s.d. sensitivities $δ{\rm Re} d_τ= 4.5\times 10^{-18}$ ecm ($5.3\times 10^{-18}$ ecm) and $δ{\rm Im} d_τ= 2.2 \times 10^{-18}$ ecm ($2.7\times 10^{-18}$ ecm) at $\sqrt{s}=4.18$ GeV ($4.95$ GeV).
description: Comments: Latex, 12 pages
All-DC Wind Generation Systems-Slides
Creators: Omid Beik
Publisher: name: IEEE
Year: 2023

PELS Webinar Slides
Abstract: This webinar will present a case for an all-DC scheme for wind generation systems. The all-DC gird includes: (i) A wind turbine conversion system that is amenable to higher voltages and adaptable for connection to DC collector grids. (ii) A medium voltage DC collector (DC) collector grid. (iii) A high voltage DC (HVDC) transmission grid. The MVDC is stepped-up to HVDC on the offshore substation using solid state transformer (SST), while the wind farm is connected to the AC grid on the shore using multilevel modular converters (MMC). With the advancements in power electronics systems and the flexibility and controllability that they offer the transmission grids in wind power systems have started shifting from high voltage AC systems to HVDC grids. However, the collector grids in wind power systems have stayed largely unchanged, i.e. rated at medium voltage AC levels. This is due to low-voltage conversion systems in wind turbines and particularly the back-to-back voltage source converters (VSCs). The power electronics switches that are building blocks of VSCs are not yet commercially available at higher-voltage and high-current. Therefore, for such applications the VSCs will need to be multilevel and modular by connecting switches in series and parallel. This makes them bulky and costly and hence unsuitable for the confined space within the wind turbine. Therefore, the output of back-to-back VSCs and the wind turbine is rated at low-voltage AC levels and a tower transformer is used to step this voltage up to medium voltage AC levels. In this webinar a high-voltage wind turbine conversion system will be presented that eliminates the VSCs in wind turbines, provides a DC output, and facilitates the connection of wind turbines to a MVDC collector grid.
Frequency Selective Surfaces for High Sensitivity Terahertz Sensing
Creators: name: Debus, Christian
name: Bolívar, Peter Haring
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: An apporach for the sensing of small amounts of chemical and biochemical material is presented. A frequency selective surface (FSS) made from asymmetric split ring resonators (aDSR) is excited with free space radiation. Due to interference effects a resonance occurs with a steep flank in the frequency response which is shifted upon dielectric loading. Utilizing a strong E-field concentration by selective loading the detection of very small amounts of probe material becomes possible. The functionality is proven by numerical simulation and the optimization of structure and loading is performed.
description: 7 pages, 5 figures
Spectral Analysis of a Two Body Problem with Zero Range Perturbation
Creators: name: Correggi, M.
name: Dell'Antonio, G.
name: Finco, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 81Q10, 81U05

description: We consider a class of singular, zero-range perturbations of the Hamiltonian of a quantum system composed by a test particle and a harmonic oscillators in dimension one, two and three and we study its spectrum. In facts we give a detailed characterization of point spectrum and its asymptotic behavior with respect to the parameters entering the Hamiltonian. We also partially describe the positive spectrum and scattering properties of the Hamiltonian.
description: Version submitted for publication, AMStex, 22 pages
Are part-time and full-time small farms detrimental to agriculture : evidence from Taiwan, 1972-1980
Creators: name: Wardenier, Rita
Publisher: name: University of British Columbia
Year: 2010

description: Slow agricultural growth in the seventies in Taiwan has induced a second land reform debate which starts from the assumption that small farms, and especially small part-time farms, are less productive than large full-time farms. But very little empirical evidence is presented. This study attempts to investigate the validity of the assumption. The data is drawn from the 1972-1980 surveys on the North, Mid-, South rice and Sugar regions in the (daily) 'Farm Record Keeping Families' surveys. The differences in production pattern and simple land productivity measures were analysed on the basis of multi-characteristic dummy variable regressions. Total factor productivity was estimated with value-added functions of five family-supplied inputs: paddy and dry cultivated land, male and female labour days and farm assets. The response of the agrarian structure to the loss of rural workers since 1968 (and more recently of land too), has been a decline in large full-time farming. Our study shows that this process should not be countered artificially because there is no evidence that large full-time farming is superior to small full-time farming and only on dominant land type farms in the regions are small full-time farms more efficient than small part-time farms. Large full-time farms have not responded faster to shifts towards non-staple food demand, nor to mechanization and new intermediate inputs. Land productivity on large full-time farms is substantially lower than on small full-time farms and only slightly higher than on small part-time farms. Farm investment, farm assets and machine stock per hectare are similar across farms and additionally, the returns to scale are constant because the 'custom services' system has made machinery divisible. In some cases, part-time small farms show some total factor efficiency loss against full-time small farms, probably because the recommended farming methods are not appropriate for part-time farms. Policies should continue to improve the working of the land market but no artificial agrarian restructuring is recommended. The production of supervision-sensitive crops needs small full-time farmers and part-time farming limitations would produce little efficiency gain against the nightmare of labour movements restrictions.
KamLAND-Zen 800
Creators: name: Hideyoshi Ozaki
Publisher: name: Zenodo
Year: 2021
Subjects: Neutrino Masses and Mixing - Double Beta Decays and Neutrino

description: Parallel Contributed Talk at the
 "XIX International Workshop on Neutrino Telescopes"
 on line - 18-26 February, 2021
description: for the KamLAND-Zen Collaboration
Thermal coupled cluster theory for SU(2) systems
Creators: name: Harsha, Gaurav
name: Xu, Yi
name: Henderson, Thomas M.
name: Scuseria, Gustavo E.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Coupled cluster (CC) has established itself as a powerful theory to study correlated quantum many-body systems. Finite-temperature generalizations of CC theory have attracted considerable interest and have been shown to work as nicely as the ground-state theory. However, most of these recent developments address only fermionic or bosonic systems. The distinct structure of the $su(2)$ algebra requires the development of a similar thermal CC theory for spin degrees of freedom. In this paper, we provide a formulation of our thermofield-inspired thermal CC for SU(2) systems. We apply the thermal CC to the Lipkin-Meshkov-Glick system as well as the one-dimensional transverse field Ising model as benchmark applications to highlight the accuracy of thermal CC in the study of finite-temperature phase diagrams in SU(2) systems.
description: 14 pages, 6 figures
Kappa-deformed oscillators, the choice of star product and free kappa-deformed quantum fields
Creators: name: Daszkiewicz, Marcin
name: Lukierski, Jerzy
name: Woronowicz, Mariusz
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In order to obtain free kappa-deformed quantum fields (with c-number commutators) we proposed new concept of kappa-deformed oscillator algebra [1] and the modification of kappa-star product [2], implementing in the product of two quantum fields the change of standard kappa-deformed mass-shell conditions. We recall here that the kappa-deformed oscillators recently introduced in [3]-[5] lie on standard kappa-deformed mass-shell. Firstly, we study kappa-deformed fields with the standard kappa-star product, what implies that in the oscillator algebra the corresponding kappa-deformed oscillators lie on standard kappa-deformed mass-shell. We argue that for the kappa-deformed algebra of such field oscillators which carry fourmomenta on kappa-deformed mass-shell it is not possible to obtain the free quantum kappa-deformed fields with the c-number commutators. Further, we study kappa-deformed quantum fields with the modified kappa-star product which implies the modification of kappa-deformed mass-shell. We obtain large class of kappa-deformed statistics depending on six arbitrary functions which provides the c-number field commutator functions. Such general class of kappa-oscillators can be described as the kappa-deformation of standard oscillator algebra obtained by composing general kappa-deformed multiplication with the deformation of the flip operator.
description: 21 pages;v3 more clearly exposed aims and results in the paper; the version which will appear in Journ.Phys.A
Radio Through X-ray Spectral Energy Distributions of 38 Broad Absorption Line Quasars
Creators: name: Gallagher, S. C.
name: Hines, D. C.
name: Blaylock, M.
name: Priddey, R. S.
name: Brandt, W. N.
name: Egami, E. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have compiled the largest sample of multiwavelength spectral energy distributions (SEDs) of Broad Absorption Line (BAL) quasars to date, from the radio to the X-ray. We present new Spitzer MIPS (24, 70, and 160 micron) observations of 38 BAL quasars in addition to data from the literature and public archives. In general, the mid-infrared properties of BAL quasars are consistent with those of non-BAL quasars of comparable luminosity. In particular, the optical-to-mid-infrared luminosity ratios of the two populations are indistinguishable. We also measure or place upper limits on the contribution of star formation to the far-infrared power. Of 22 (57%) upper limits, seven quasars have sufficiently sensitive constraints to conclude that star formation likely contributes little (<20%) to their far-infrared power. The 17 BAL quasars (45%) with detected excess far-infrared emission likely host hyperluminous starbursts with L_fir,SF=10^{13-14} L_sun. Mid-infrared through X-ray composite BAL quasar SEDs are presented, incorporating all of the available photometry. Overall, we find no compelling evidence for inherent differences between the SEDs of BAL vs. non-BAL quasars of comparable luminosity. Therefore a ``cocoon'' picture of a typical BAL quasar outflow whereby the wind covers a large fraction of the sky is not supported by the mid-infrared SED comparison with normal quasars, and the disk-wind paradigm with a typical radio-quiet quasar hosting a BAL region remains viable.
description: 21 pages, LaTeX, uses emulateapj. 12 figures (2 color). Accepted for publication in ApJ
A wide-field CO survey towards the California Molecular Filament
Creators: name: Guo, Weihua
name: Chen, Xuepeng
name: Feng, Jiancheng
name: Sun, Li
name: Wang, Chen
name: Su, Yang
name: Sun, Yan
name: Ao, Yiping
name: Zhang, Shaobo
name: Zhou, Xin
name: Yuan, Lixia
name: Yang, Ji
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the survey of $^{12}$CO/$^{13}$CO/C$^{18}$O (J=1-0) toward the California Molecular Cloud (CMC) within the region of 161.75$^{\circ} \leqslant l \leqslant$ 167.75$^{\circ}$,-9.5$^{\circ} \leqslant b \leqslant $-7.5$^{\circ}$, using the Purple Mountain Observatory (PMO) 13.7 m millimeter telescope. Adopting a distance of 470 pc, the mass of the observed molecular cloud estimated from $^{12}$CO, $^{13}$CO, and C$^{18}$O is about 2.59$\times$10$^{4}$ M$_\odot$, 0.85$\times$10$^{4}$ M$_\odot$, and 0.09$\times$10$^{4}$ M$_\odot$, respectively. A large-scale continuous filament extending about 72 pc is revealed from the $^{13}$CO images. A systematic velocity gradient perpendicular to the major axis appears and is measured to be $\sim$ 0.82 km s$^{-1}$ pc$^{-1}$. The kinematics along the filament shows an oscillation pattern with a fragmentation wavelength of $\sim$ 2.3 pc and velocity amplitude of $\sim$ 0.92 km s$^{-1}$, which may be related with core-forming flows. Furthermore, assuming an inclination angle to the plane of the sky of 45$^{\circ}$, the estimated average accretion rate is $\sim$ 101 M$_\odot$ Myr$^{-1}$ for the cluster LkH$α$ 101 and $\sim$ 21 M$_\odot$ Myr$^{-1}$ for the other regions. In the C$^{18}$O observations, the large-scale filament could be resolved into multiple substructures and their dynamics are consistent with the scenario of filament formation from converging flows. Approximately 225 C$^{18}$O cores are extracted, of which 181 are starless cores. Roughly 37$\%$ (67/181) of the starless cores have $α_{\text{vir}}$ less than 1. Twenty outflow candidates are identified along the filament. Our results indicate active early-phase star formation along the large-scale filament in the CMC region.
description: 28 pages, 15 figures, accepted by ApJ
Fully self-consistent ion-drag force calculations for dust in collisional plasmas with external electric field
Creators: name: Patacchini, Leonardo
name: Hutchinson, Ian H
Publisher: name: arXiv
Year: 2008
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The ion-drag force on a spherical dust particle immersed in a flowing plasma with external electric field is self-consistently calculated using the Particle In Cell code SCEPTIC in the entire range of charge-exchange collisionality. Our results, not based on questionable approximations, extend prior analytic calculations valid only in a few limiting regimes. Particular attention is given to the force direction, shown never to be directed opposite to the flow except in the continuum limit, where other forces are of much stronger magnitude.
description: 4 Pages, 4 Figures Submitted to PRL
Interoccurrence time statistics in the two-dimensional Burridge-Knopoff earthquake model
Creators: name: Hasumi, Tomohiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We have numerically investigated statistical properties of the so-called interoccurrence time or the waiting time, i.e., the time interval between successive earthquakes, based on the two-dimensional (2-D) spring-block (Burridge-Knopoff) model, selecting the velocity-weakening property as the constitutive friction law. The statistical properties of frequency distribution and the cumulative distribution of the interoccurrence time are discussed by tuning the dynamical parameters, namely, a stiffness and frictional property of a fault. We optimize these model parameters to reproduce the interoccurrence time statistics in nature; the frequency and cumulative distribution can be described by the power law and Zipf-Mandelbrot type power law, respectively. In an optimal case, the b-value of the Gutenberg-Richter law and the ratio of wave propagation velocity are in agreement with those derived from real earthquakes. As the threshold of magnitude is increased, the interoccurrence time distribution tends to follow an exponential distribution. Hence it is suggested that a temporal sequence of earthquakes, aside from small-magnitude events, is a Poisson process, which is observed in nature. We found that the interoccurrence time statistics derived from the 2-D BK (original) model can efficiently reproduce that of real earthquakes, so that the model can be recognized as a realistic one in view of interoccurrence time statistics.
description: 10 pages, 8 figures
Four Fermion Operator Matching with NRQCD Heavy and AsqTad Light Quarks
Creators: name: Gamiz, Elvira
name: Shigemitsu, Junko
name: Trottier, Howard
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present one-loop matching coefficients between continuum and lattice QCD for the heavy-light four-fermion operators relevant for neutral B meson mixing both within and beyond the Standard Model. For the lattice theory we use nonrelativistic QCD (NRQCD) to describe b quarks and improved staggered fermions (AsqTad) for light quarks. The gauge action is the tree-level Symanzik improved gauge action. Matching to full QCD is carried out through order alpha_s, Lambda_{QCD}/M_b, and alpha_s/(aM_b).
description: 8 pages, 4 figures
Solutions of Higher Dimensional Gauss-Bonnet FRW Cosmology
Creators: name: Andrew, Keith
name: Bolen, Brett
name: Middleton, Chad A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We examine the effect on cosmological evolution of adding a Gauss-Bonnet term to the standard Einstein-Hilbert action for a (1 + 3)+ d dimensional Friedman-Robertson-Walker (FRW) metric. By assuming that the additional dimensions compactify as a power law as the usual 3 spatial dimensions expand, we solve the resulting dynamical equations and find that the solution may be of either de Sitter or Kasner form depending upon whether the Gauss-Bonnet term or the Einstein term dominates.
description: 10 pages, references added/corrected, accepted for publication in General Relativity and Gravitation
Perovskite-type YRh$_{3}$B with multiple types of nodal point and nodal line states
Creators: name: Zhou, Feng
name: Cui, Chaoxi
name: Wang, Jianhua
name: Kuang, Minquan
name: Yang, Tie
name: Yu, Zhi-Ming
name: Wang, Xiaotian
name: Zhang, Gang
name: Cheng, Zhenxiang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Experimentally synthesized perovskite-type YRh$_{3}$B with a $Pm\bar{3}m$ type structure was proposed as a novel topological material (TM) via first-principles calculations and the low-energy $k\cdot p$ effective Hamiltonian, which has a quadratic contact triple point (QCTP) at point $Γ$ and six pairs of open nodal lines (NLs) of the hybrid type. Clear surface states observed in the surface spectrum confirmed the topological states. When spin-orbit coupling was considered, the QCTP at $Γ$ transferred to the quadratic-type Dirac nodal point (NP). Under 1$\%$ tetragonal strained lattice constants, YRh$_{3}$B hosted richer topological states, including a quadratic-type two-fold degenerate NP, six pairs of open NLs of the hybrid type, and two closed NLs of type I and hybrid type. Moreover, it was proved that the NLs of YRh$_{3}$B at its strained lattice constants contain all types of band-crossing points (BCPs) (i.e., type I, type II, and critical type). Such rich types of NP and NL states in one compound make it potentially applicable for multifunctional electronic devices as well as an appropriate platform to study entanglement among topological states.
The LEGEND neutrinoless double- beta decay program
Creators: name: Reyco Henning
Publisher: name: Zenodo
Year: 2021
Subjects: Neutrino Masses and Mixing - Double Beta Decays and Neutrino

description: Parallel Contributed Talk at the
 "XIX International Workshop on Neutrino Telescopes"
 on line - 18-26 February, 2021
A "typical" contraction is unitary
Creators: name: Eisner, Tanja
Publisher: name: arXiv
Year: 2008
Subjects: subject: Functional Analysis (math.FA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 47A05, 47D06, 37A05

description: We show that (for the weak operator topology) the set of unitary operators on a separable infinite-dimensional Hilbert space is residual in the set of all contractions. The analogous result holds for isometries and the strong operator topology as well. These results are applied to the problem of embedding operators into strongly continuous semigroups.
description: 5 pages
Remote Observing at ESO's La Silla Observatory : The Legacy 20 Years After
Creators: name: Baade, Dietrich
name: Zijlstra, Albert
name: Wallander, Anders
name: Balestra, Andrea
name: Hoppe, Elisabeth
name: Labraña, Francisco
name: Dobbels, Geert
name: Raffi, Gianni
name: Rodríguez Ulloa, Jesús
Publisher: name: Zenodo
Year: 2019

description: In the 1990s, ESO was a world leader in remote observing with ground-based optical
telescopes.  The observations were carried out under full remote control as opposed to mere
remote monitoring.  Remote observing was  offered as a standard observing mode of the 3.5-m
New Technology Telescope (NTT), the 2.2-m MPG/ESO Telescope, and the 1.4-m Coudé Auxiliary
Telescpe (CAT) and available from ESO's Headquarters in Garching.  Ultimately, more than 50% of
all CAT observations were obtained remotely.  The formal objective was to save costs incurred by
ESO and travel and acclimatization time of the observers.  However, more relevant effects were in
the area of control systems, common procedures and communication protocols, almost daily
operations-oriented interactions between ESO's observatory  in Chile and its headquarters in
Germany, and the resulting bi-directional feedback loops.  The talk will review challenges, solutions,
and lessons learned, also with a perspective towards future set-ups and facilities.  (Although the
present proposal for this talk about remote observing is offered under my name only, I would, in the
case of its acceptance, seek a collaboration with Anders Wallander, Gianni Raffi, and Andrea
Balestra on technical matters.)
Equilibrium states for potentials with $\supϕ- \infϕ< \htop(f)$
Creators: name: Bruin, Henk
name: Todd, Mike
Publisher: name: arXiv
Year: 2007
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37D35, 37E05, 37D25

description: In the context of smooth interval maps, we study an inducing scheme approach to prove existence and uniqueness of equilibrium states for potentials $ϕ$ with he `bounded range' condition $\sup ϕ- \inf ϕ< \htop$, first used by Hofbauer and Keller. We compare our results to Hofbauer and Keller's use of Perron-Frobenius operators. We demonstrate that this `bounded range' condition on the potential is important even if the potential is Hölder continuous. We also prove analyticity of the pressure in this context.
description: Added Lemma 6 to deal with the disparity between leading eigenvalues and operator norms. Added extra references and corrected some typos
Contact Geometry of Hyperbolic Equations of Generic Type
Creators: name: The, Dennis
Publisher: name: arXiv
Year: 2008
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 35A30, 35L70, 58J70

description: We study the contact geometry of scalar second order hyperbolic equations in the plane of generic type. Following a derivation of parametrized contact-invariants to distinguish Monge-Ampere (class 6-6), Goursat (class 6-7) and generic (class 7-7) hyperbolic equations, we use Cartan's equivalence method to study the generic case. An intriguing feature of this class of equations is that every generic hyperbolic equation admits at most a nine-dimensional contact symmetry algebra. The nine-dimensional bound is sharp: normal forms for the contact-equivalence classes of these maximally symmetric generic hyperbolic equations are derived and explicit symmetry algebras are presented. Moreover, these maximally symmetric equations are Darboux integrable. An enumeration of several submaximally symmetric (eight and seven-dimensional) generic hyperbolic structures is also given.
description: This is a contribution to the Special Issue "Elie Cartan and Differential Geometry", published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA
Elliptic aspects of statistical mechanics on spheres
Creators: name: Dowker, J. S.
name: Kirsten, Klaus
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Number Theory (math.NT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Our earlier results on the temperature inversion properties and the ellipticisation of the finite temperature internal energy on odd spheres are extended to orbifold factors of odd spheres and then to other thermodynamic quantities, in particular to the specific heat. The behaviour under modular transformations is facilitated by the introduction of a modular covariant derivative and it is shown that the specific heat on any odd sphere can be expressed in terms of just three functions. It is also shown that the free energy on the circle can be written elliptically.
description: 22 pages. JyTex
A novel technique for the study of pile-up events in cryogenic bolometers
Creators: name: Dell'Oro, Stefano
Publisher: name: Zenodo
Year: 2021
Subjects: Neutrino Masses and Mixing - Double Beta Decays and Neutrino

description: Parallel Flash Talk at the
 "XIX International Workshop on Neutrino Telescopes"
 on line - 18-26 February, 2021
description: on behalf of the CUPID Collaboration