cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Implementing a search for aligned-spin neutron star -- black hole systems with advanced ground based gravitational wave detectors
Creators: name: Canton, Tito Dal
name: Nitz, Alexander H.
name: Lundgren, Andrew P.
name: Nielsen, Alex B.
name: Brown, Duncan A.
name: Dent, Thomas
name: Harry, Ian W.
name: Krishnan, Badri
name: Miller, Andrew J.
name: Wette, Karl
name: Wiesner, Karsten
name: Willis, Joshua L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the effect of spins on searches for gravitational waves from compact binary coalescences in realistic simulated early advanced LIGO data. We construct a detection pipeline including matched filtering, signal-based vetoes, a coincidence test between different detectors, and an estimate of the rate of background events. We restrict attention to neutron star--black hole (NS-BH) binary systems, and we compare a search using non-spinning templates to one using templates that include spins aligned with the orbital angular momentum. To run the searches we implement the binary inspiral matched-filter computation in PyCBC, a new software toolkit for gravitational-wave data analysis. We find that the inclusion of aligned-spin effects significantly increases the astrophysical reach of the search. Considering astrophysical NS-BH systems with non-precessing black hole spins, for dimensionless spin components along the orbital angular momentum uniformly distributed in $(-1, 1)$, the sensitive volume of the search with aligned-spin templates is increased by $\sim 50\%$ compared to the non-spinning search; for signals with aligned spins uniformly distributed in the range $(0.7,1)$, the increase in sensitive volume is a factor of $\sim 10$.
description: 17 pages, 12 figures; version accepted by PRD
Unified mechanism behind the even-parity ground state and neutron halo of $^{11}$Be
Creators: name: Geng, Jing
name: Niu, Yi Fei
name: Long, Wen Hui
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using the axially deformed relativistic Hartree-Fock-Bogoliubov (D-RHFB) model, we explore the mechanism behind the parity inversion and halo occurrence in $^{11}$Be, which are well reproduced by the RHF Lagrangian PKA1. It is illustrated that evidently enhanced deformation effects by the $π$-pseudo-vector and $ρ$-tensor couplings in PKA1 are crucial for correctly describing both even-parity ground state (GS) and neutron halo of $^{11}$Be. Coupling with the deformation, the intrude $1d_{5/2}$ component largely enhances the couplings between the even-parity orbit $1/2_2^+$ and the nuclear core to promise the even-parity GS, whereas the $2s_{1/2}$ component therein dominates the halo formation in $^{11}$Be. Moreover, the deformed halo in $^{11}$Be is found to be stabilized by the attractive inherent correlations between the $1d_{5/2}$ and $2s_{1/2}$ components of the halo orbit $1/2_2^+$, instead of pairing correlations, which paves a new way to understand the halo pictures in deformed unstable nuclei.
description: 4 figures, 1 table, 9 pages
When Optical Microscopy Meets All-Optical Analog Computing: A Brief Review
Creators: name: Shou, Yichang
name: Liu, Jiawei
name: Luo, Hailu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: As a revolutionary observation tool in life science, biomedical, and material science, optical microscopy allows imaging of samples with high spatial resolution and a wide field of view. However, conventional microscopy methods are limited to single imaging and cannot accomplish real-time image processing. The edge detection, image enhancement and phase visualization schemes have attracted great interest with the rapid development of optical analog computing. The two main physical mechanisms that enable optical analog computing originate from two geometric phases: the spin-redirection Rytov-Vlasimirskii-Berry (RVB) phase and the Pancharatnam-Berry (PB) phase. Here, we review the basic principles and recent research progress of the RVB phase and PB phase based optical differentiators. Then we focus on the innovative and emerging applications of optical analog computing in microscopic imaging. Optical analog computing is accelerating the transformation of information processing from classical imaging to quantum techniques. Its intersection with optical microscopy opens opportunities for the development of versatile and compact optical microscopy systems.
description: 17 pages, 7 figures
Fast Generation of Spectrally-Shaped Disorder
Creators: name: Shih, Aaron
name: Casiulis, Mathias
name: Martiniani, Stefano
Publisher: name: arXiv
Year: 2023
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Media with correlated disorder display unexpected transport properties, but it is still a challenge to design structures with desired spectral features at scale. In this work, we introduce an optimal formulation of this inverse problem by means of the non-uniform fast Fourier transform, thus arriving at an algorithm capable of generating systems with arbitrary spectral properties, with a computational cost that scales $O(N \log N)$ with system size. The method is extended to accommodate arbitrary real-space interactions, such as short-range repulsion, to simultaneously control short- and long-range correlations. We thus generate the largest-ever stealthy hyperuniform configurations in $2d$ ($N = 10^9$) and $3d$ ($N > 10^7$). By an Ewald sphere construction we link the spectral and optical properties at the single-scattering level, and show that these structures in $2d$ and $3d$ generically display transmission gaps, providing a concrete example of fine-tuning of a physical property at will. We also show that large $3d$ power-law hyperuniformity in particle packings leads to single-scattering properties near-identical to those of simple hard spheres. Finally, we show that enforcing large spectral power at a small number of peaks with the right symmetry leads to the non-deterministic generation of quasicrystalline structures in both $2d$ and $3d$.
description: 9 pages / 5 figures + 3 pages of appendices / 5 appendix figures + 18 pages and 12 figures in SI
Normal or abnormal isospin-fractionation as a qualitative probe of nuclear symmetry energy at supradensities
Creators: name: Guo, Wen-Mei
name: Yong, Gao-Chan
name: Wang, Yongjia
name: Li, Qingfeng
name: Zhang, Hongfei
name: Zuo, Wei
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Within two different frameworks of isospin-dependent transport model, effect of nuclear symmetry energy at supradensities on the isospin-fractionation (IsoF) was investigated. With positive/negative symmetry potential at supradensities (i.e., values of symmetry energy increase/decrease with density above saturation density), for energetic nucleons, the value of neutron to proton ratio of free nucleons is larger/smaller than that of bound nucleon fragments. Compared with extensively studied quantitative observables of nuclear symmetry energy, the normal or abnormal isospin-fractionation of energetic nucleons can be a qualitative probe of nuclear symmetry energy at supradensities.
description: 5 pages, 5 figures, accepted by Physics Letters B
Foundry manufacturing of tight-confinement, dispersion-engineered, ultralow-loss silicon nitride photonic integrated circuit
Creators: name: Ye, Zhichao
name: Jia, Haiyan
name: Huang, Zhangjun
name: Shen, Chen
name: Long, Jinbao
name: Shi, Baoqi
name: Luo, Yi-Han
name: Gao, Lan
name: Sun, Wei
name: Guo, Hairun
name: He, Jijun
name: Liu, Junqiu
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The foundry development of integrated photonics has revolutionized today's optical interconnect and datacenters. Over the last decade, we have witnessed the rising of silicon nitride (Si$_3$N$_4$) integrated photonics, which is currently transferring from laboratory research to foundry manufacturing. The development and transition are triggered by the ultimate need of low optical loss offered by Si$_3$N$_4$, which is beyond the reach of silicon and III-V semiconductors. Combined with modest Kerr nonlinearity, tight optical confinement and dispersion engineering, Si$_3$N$_4$ has today become the leading platform for linear and Kerr nonlinear photonics, and has enabled chip-scale lasers featuring ultralow noise on par with table-top fiber lasers. However, so far all the reported fabrication processes of tight-confinement, dispersion-engineered Si$_3$N$_4$ photonic integrated circuit (PIC) with optical loss down to few dB/m have only been developed on 4-inch or smaller wafers. Yet, to transfer these processes to established CMOS foundries that typically operate 6-inch or even larger wafers, challenges remain. In this work, we demonstrate the first foundry-standard fabrication process of Si$_3$N$_4$ PIC with only 2.6 dB/m loss, thickness above 800 nm, and near 100% fabrication yield on 6-inch wafers. Such thick and ultralow-loss Si$_3$N$_4$ PIC enables low-threshold generation of soliton frequency combs. Merging with advanced heterogeneous integration, active ultralow-loss Si$_3$N$_4$ integrated photonics could pave an avenue to addressing future demands in our increasingly information-driven society.
Quantum supergroups IV. The modified form
Creators: name: Clark, Sean
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 17B37

description: We construct a canonical basis for a class of tensor product modules of a quantum covering group associated to a Kac-Moody Lie superalgebra of anisotropic type, and use these bases to construct a canonical basis for the modified form of a quantum covering group.
description: v1 32 pages; v2 33 pages, minor changes, to appear in Mathematische Zeitschrift
A fast time-domain boundary element method for three-dimensional electromagnetic scattering problems
Creators: name: Takahashi, Toru
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: This paper proposes a fast time-domain boundary element method (TDBEM) to solve three-dimensional transient electromagnetic scattering problems regarding perfectly electric conductors in the classical marching-on-in-time manner. The algorithm of the fast TDBEM is a time-domain variant of the interpolation-based fast multipole method (IFMM), which is similar to the time-domain IFMM for acoustic scattering problems investigated in the author's previous studies. The principle of the present IFMM is to interpolate the kernel functions of the electric and magnetic field integral equations (EFIE and MFIE, respectively) so that every kernel function is expressed in a form of separation of variables in terms of both the spatial and temporal variables. Such an expression enables to construct a fast method to evaluate the scalar and vector potentials in the EFIE and MFIE with using so-called multipole-moments and local-coefficients associated with a space-time hierarchy. As opposed to $O(N_s^2 N_t)$ of the conventional TDBEM, the computational complexity of the fast TDBEM is estimated as $O(N_s^{1+δ}N_t)$, where $N_s$ and $N_t$ stand for the spatial and temporal degrees of freedom, respectively, and $δ$ is typically $1/2$ or $1/3$. The numerical examples presented the advantages of the proposed fast TDBEM over the conventional TDBEM when solving large-scale problems.
Estudio paleofaunístico del pleistoceno superior en el área de playas de Tijuana, Baja California, México /
Creators: name: Calvo Guiza, Larisha Viviana
Publisher: name: Universidad Autónoma de Baja California.
Year: 2022
Subjects: subject: QE808 C35 1993

description: Se realizó un estudio paleofaunístico de un afloramiento localizado en la porción de Playas de Tijuana, municipio de Tijuana, B.C. México; identificándose un total de 61 especies de gasterópodos en las tres estaciones de muestreo.
Cosmology in nonlocal gravity
Creators: name: Koshelev, Alexey S.
name: Kumar, K. Sravan
name: Starobinsky, Alexei A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this chapter we review the recent developments of realizing $R^2$-like inflation in the framework of a most general UV nonlocal extension of Einstein's general theory of relativity (GR). It is a well-motivated robust approach towards quantum gravity. In the past decades, nonlocal gravitational theories which are quadratic in curvature have been understood to be ghost-free and super-renormalizable around maximally symmetric spacetimes. However, in the context of early Universe cosmology we show that one must go beyond the quadratic curvature nonlocal gravity in order to achieve a consistent ghost-free framework of Universe evolution from quasi de Sitter to Minkowski spacetime. In this regard, we discuss a construction of a most general nonlocal gravity action that leads to $R^2$-like inflation and discuss the corresponding observational predictions for the scalar and tensor spectral tilts, tensor-to-scalar ratio, and the primordial non-Gaussianities. We present an analysis of how the nonlocal inflationary cosmology goes beyond the established notions of effective field theories of inflation. Finally, we comment on some open questions and prospects of higher curvature nonlocal gravity on its way of achieving the UV completion.
description: 31 pages, 4 figures, Invited chapter of the Handbook of Quantum Gravity, C. Bambi, L. Modesto and I.L. Shapiro (Eds.), Springer, expected in 2023
Third-order topological insulator induced by disorder
Creators: name: Lóio, Hugo
name: Gonçalves, Miguel
name: Ribeiro, Pedro
name: Castro, Eduardo V.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We have found the first instance of a third-order topological Anderson insulator (TOTAI). This disorder-induced topological phase is gapped and characterized by a quantized octupole moment and topologically protected corner states, as revealed by a detailed numerically exact analysis. We also find that the disorder-induced transition into the TOTAI phase can be analytically captured with remarkable accuracy using the self-consistent Born approximation. For a larger disorder strength, the TOTAI undergoes a transition to a trivial diffusive metal, that in turn becomes an Anderson insulator at even larger disorder. Our findings show that disorder can induce third-order topological phases in 3D, therefore extending the class of known higher-order topological Anderson insulators.
Resonance chains in open systems, generalized zeta functions and clustering of the length spectrum
Creators: name: Barkhofen, Sonja
name: Faure, Frédéric
name: Weich, Tobias
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mathematical Physics (math-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Dynamical Systems (math.DS)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35P25, 47A40, 58J50, 81Q50, 81Q05

description: In many non-integrable open systems in physics and mathematics resonances have been found to be surprisingly ordered along curved lines in the complex plane. In this article we provide a unifying approach to these resonance chains by generalizing dynamical zeta functions. By means of a detailed numerical study we show that these generalized zeta functions explain the mechanism that creates the chains of quantum resonance and classical Ruelle resonances for 3-disk systems as well as geometric resonances on Schottky surfaces. We also present a direct system-intrinsic definition of the continuous lines on which the resonances are strung together as a projection of an analytic variety. Additionally, this approach shows that the existence of resonance chains is directly related to a clustering of the classical length spectrum on multiples of a base length. Finally, this link is used to construct new examples where several different structures of resonance chains coexist.
Design and implementation of intelligent packet filtering in IoT microcontroller-based devices
Creators: name: Bertoli, Gustavo de Carvalho
name: Fernandes, Gabriel Victor C.
name: Monici, Pedro H. Borges
name: Guibo, César H. de Araujo
name: Pereira, Lourenço Alves
name: Santos, Aldri
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Machine Learning (cs.LG)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Internet of Things (IoT) devices are increasingly pervasive and essential components in enabling new applications and services. However, their widespread use also exposes them to exploitable vulnerabilities and flaws that can lead to significant losses. In this context, ensuring robust cybersecurity measures is essential to protect IoT devices from malicious attacks. However, the current solutions that provide flexible policy specifications and higher security levels for IoT devices are scarce. To address this gap, we introduce T800, a low-resource packet filter that utilizes machine learning (ML) algorithms to classify packets in IoT devices. We present a detailed performance benchmarking framework and demonstrate T800's effectiveness on the ESP32 system-on-chip microcontroller and ESP-IDF framework. Our evaluation shows that T800 is an efficient solution that increases device computational capacity by excluding unsolicited malicious traffic from the processing pipeline. Additionally, T800 is adaptable to different systems and provides a well-documented performance evaluation strategy for security ML-based mechanisms on ESP32-based IoT systems. Our research contributes to improving the cybersecurity of resource-constrained IoT devices and provides a scalable, efficient solution that can be used to enhance the security of IoT systems.
description: 11 pages, under review
Discourse Analysis of Communications Interactions Between Senators and Resource Persons During Committee Deliberations
Creators: name: Miguel, Jade D.
Publisher: name: Zenodo
Year: 2019
Subjects: legislation
power play
free tuition
resource persons

description: Miquel, J.D. (2018). Discourse Analysis of Communication Interactions Between Senators and Resource Persons During Committee Deliberations: The Case of RA 10931 (Universal Access to Quality Tertiary Education Act or the Free Tuition Law), Unpublished Master's Thesis, University of the Philippines Open University.
 This study aims to determine the extent of power play among legislators and resource persons during the committee deliberations of the proposed Free Tuition Law by looking into the communication interactions among them and the scope of influence of resource persons in this specific part of legislation–Senate committee level.
 Since the study focuses on the communication processes in legislation, literature gives a closer look at committee hearings and how it encourages participation and interaction between lawmakers and resource persons.
 By employing discourse analysis as research design and Dyadic Power Theory (DPT) as theoretical lens, the study forms an inductive data-driven analysis of the transcript during the committee deliberations of the specific bill.
 Results of the study show that legislation is a communication process. Lawmakers and resource persons interact with each other and communicate their interests, suggestions, and reservations on the proposed bill—a discourse that is instrumental for the passage of the measure into law.
 More importantly, the study reveals that senators are keen to pass the then Free Higher Education Act despite the reservations of resource persons. While minor suggestions of resource persons were taken into account as reflected in the bill passed by the Senate, important issues raised by the former were not considered in the bill's final draft. The recommendations to grant free tuition subsidy only to poor students and to address the lack of quality education in public educational institutions on top of the bill's goal to increase accessibility of tertiary education were apparently not reflected in the law. The study also highlights the underlying flaws in the Free Tuition Law which puts into question if the law indeed promotes equitable access to college education despite having untargeted beneficiaries and merit-based selection of students.
Deep Stochastic Mechanics
Creators: name: Orlova, Elena
name: Ustimenko, Aleksei
name: Jiang, Ruoxi
name: Lu, Peter Y.
name: Willett, Rebecca
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Quantum Physics (quant-ph)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: This paper introduces a novel deep-learning-based approach for numerical simulation of a time-evolving Schrödinger equation inspired by stochastic mechanics and generative diffusion models. Unlike existing approaches, which exhibit computational complexity that scales exponentially in the problem dimension, our method allows us to adapt to the latent low-dimensional structure of the wave function by sampling from the Markovian diffusion. Depending on the latent dimension, our method may have far lower computational complexity in higher dimensions. Moreover, we propose novel equations for stochastic quantum mechanics, resulting in quadratic computational complexity with respect to the number of dimensions. Numerical simulations verify our theoretical findings and show a significant advantage of our method compared to other deep-learning-based approaches used for quantum mechanics.
description: ICML 2024
О буњевачком језичком питању у Језикофилу Института за српски језик САНУ и још понешто о српској икавици
Creators: name: Радић, Првослав
Publisher: name: Zenodo
Year: 2021
Subjects: српски језик
Србија
Буњевци
Језикофил
Институт за српски језик САНУ

description: Недавно је на лингвистичком интернет сајту Језикофил, чији су покретачи и уредници група истраживача с Института за српски језик САНУ, објављен непотписани чланак посвећен буњевачком језичком питању. Заправо, судећи по потпису Језикофил, који стоји на крају, рекло би се да је овај кратки чланак заједничко дело уредништва, мада је вероватније да је настао из пера неког од млађих сарадника, што се види већ по одабиру теме и начину формулисања наслова, те његовим језичкостилским мањкавостима. У сваком случају, спремност аутора да у рубрици Реч лингвисте наступи анонимно, тј. под плаштом уредништва (за шта је, претпостављам, био потребан пристанак обе стране), говори о његовој спознаји да он није саговорник за дискусију о овом озбиљном и сложеном питању, које се тиче и науке и културе и политике истовремено, и то не од јуче. Побуде за овакав ауторов наступ не тичу се изгледа толико науке и струке колико недавно актуализованог питања службеног језика Буњеваца у Србији, чиме су обиловали новински наслови последњих месеци. Да подсетим: Одборници Скупштине Суботице су 8. марта ове године изгласали промену Статута града Суботице како би „буњевачки језик“ био уведен у равноправну службену употребу с осталим тамошњим језицима. То је изазвало оштра противљења у Хрватској (реакције Матице хрватске, Института за хрватски језик и језикословље и др.), која је у овоме видела угрожавање хрватске националне мањине у Србији (исп. нпр. кратке прегледе дате на сајтовима Слободне Европе, Спутњика и другде).
Aspects of Quantum Gravity Phenomenology and Astrophysics
Creators: name: Dasgupta, Arundhati
name: Fajardo-Montenegro, José
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: With the discovery of gravitational waves, the search for the quantum of gravity, the graviton, is imminent. We discuss the current status of the bounds on graviton mass from experiments as well as the theoretical understanding of these particles. We provide an overview of current experiments in astrophysics such as the search for Hawking radiation in gamma-ray observations and neutrino detectors, which will also shed light on the existence of primordial black holes. Finally, the semiclassical corrections to the image of the event horizon are discussed.
description: 25 Pages, 4 figures
Universal properties of dipolar Bose polarons in two dimensions
Creators: name: Sánchez-Baena, Juan
name: Ardila, Luis A. Peña
name: Astrakharchik, Grigory
name: Mazzanti, Ferran
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We study the quasiparticle properties of a dipolar impurity immersed in a two-dimensional dipolar bath. We use the ab-initio Diffusion Monte Carlo technique to determine the polaron energy, effective mass and quasiparticle residue. We find that both the polaron energy and quasiparticle residue follow a universal behaviour with respect to the polarization angle when properly scaled in terms of the scattering length. This trend is maintained over a wide range of values of the gas parameter, even in the highly correlated regime. Instead, the effective mass shows growing anisotropy as the tilting angle is increased, which is induced, mainly, by the anisotropy of the impurity-boson dipole-dipole interaction. Surprisingly, the effective mass is larger in the direction of minimum inter-particle repulsion. Finally, we use our Monte Carlo results to check the accuracy of perturbative approaches and determine their range of validity in terms of the gas parameter.
description: 10 pages, 8 figures
Semi-Federated Learning for Collaborative Intelligence in Massive IoT Networks
Creators: name: Ni, Wanli
name: Zheng, Jingheng
name: Tian, Hui
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Implementing existing federated learning in massive Internet of Things (IoT) networks faces critical challenges such as imbalanced and statistically heterogeneous data and device diversity. To this end, we propose a semi-federated learning (SemiFL) framework to provide a potential solution for the realization of intelligent IoT. By seamlessly integrating the centralized and federated paradigms, our SemiFL framework shows high scalability in terms of the number of IoT devices even in the presence of computing-limited sensors. Furthermore, compared to traditional learning approaches, the proposed SemiFL can make better use of distributed data and computing resources, due to the collaborative model training between the edge server and local devices. Simulation results show the effectiveness of our SemiFL framework for massive IoT networks. The code can be found at https://github.com/niwanli/SemiFL_IoT.
description: The paper has been accepted for publication in the IEEE Internet of Things Journal
The 6dF Galaxy Velocity Survey: Cosmological constraints from the velocity power spectrum
Creators: name: Johnson, Andrew
name: Blake, Chris
name: Koda, Jun
name: Ma, Yin-Zhe
name: Colless, Matthew
name: Crocce, Martin
name: Davis, Tamara M.
name: Jones, Heath
name: Lucey, John R.
name: Magoulas, Christina
name: Mould, Jeremy
name: Scrimgeour, Morag
name: Springob, Christopher M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present scale-dependent measurements of the normalised growth rate of structure $fσ_{8}(k, z=0)$ using only the peculiar motions of galaxies. We use data from the 6-degree Field Galaxy Survey velocity sample (6dFGSv) together with a newly-compiled sample of low-redshift $(z < 0.07)$ type Ia supernovae. We constrain the growth rate in a series of $Δk \sim 0.03 h{\rm Mpc^{-1}}$ bins to $\sim35\%$ precision, including a measurement on scales $>300 h^{-1}{\rm Mpc}$, which represents one of the largest-scale growth rate measurement to date. We find no evidence for a scale dependence in the growth rate, or any statistically significant variation from the growth rate as predicted by the {\it Planck} cosmology. Bringing all the scales together, we determine the normalised growth rate at $z=0$ to $\sim15\%$ in a manner {\it independent} of galaxy bias and in excellent agreement with the constraint from the measurements of redshift-space distortions from 6dFGS. We pay particular attention to systematic errors. We point out that the intrinsic scatter present in Fundamental-Plane and Tully-Fisher relations is only Gaussian in logarithmic distance units; wrongly assuming it is Gaussian in linear (velocity) units can bias cosmological constraints. We also analytically marginalise over zero-point errors in distance indicators, validate the accuracy of all our constraints using numerical simulations, and demonstrate how to combine different (correlated) velocity surveys using a matrix `hyper-parameter' analysis. Current and forthcoming peculiar velocity surveys will allow us to understand in detail the growth of structure in the low-redshift universe, providing strong constraints on the nature of dark energy.
description: 23 pages, 14 figures, submitted to MNRAS. v2 is 25 pages, 17 figures, accepted by MNRAS
Electrodynamics Modified by Some Dimension-five Lorentz Violating Interactions: Radiative Corrections
Creators: name: Lan, Shan-quan
name: Wu, Feng
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study radiative corrections to massless quantum electrodynamics modified by two dimension-five LV interactions $\barΨ γ^μ b'^ν F_{μν}Ψ$ and $\barΨγ^μb^ν \tilde{F}_{μν} Ψ$ in the framework of effective field theories. All divergent one-particle-irreducible Feynman diagrams are calculated at one-loop order and several related issues are discussed. It is found that massless quantum electrodynamics modified by the interaction $\barΨ γ^μ b'^ν F_{μν}Ψ$ alone is one-loop renormalizable and the result can be understood on the grounds of symmetry. In this context the one-loop Lorentz-violating beta function is derived and the corresponding running coefficients are obtained.
description: 13 pages, 1 figure. Version to appear in EPJC
Towards Robust FastSpeech 2 by Modelling Residual Multimodality
Creators: name: Kögel, Fabian
name: Nguyen, Bac
name: Cardinaux, Fabien
Publisher: name: arXiv
Year: 2023
Subjects: subject: Sound (cs.SD)
subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: State-of-the-art non-autoregressive text-to-speech (TTS) models based on FastSpeech 2 can efficiently synthesise high-fidelity and natural speech. For expressive speech datasets however, we observe characteristic audio distortions. We demonstrate that such artefacts are introduced to the vocoder reconstruction by over-smooth mel-spectrogram predictions, which are induced by the choice of mean-squared-error (MSE) loss for training the mel-spectrogram decoder. With MSE loss FastSpeech 2 is limited to learn conditional averages of the training distribution, which might not lie close to a natural sample if the distribution still appears multimodal after all conditioning signals. To alleviate this problem, we introduce TVC-GMM, a mixture model of Trivariate-Chain Gaussian distributions, to model the residual multimodality. TVC-GMM reduces spectrogram smoothness and improves perceptual audio quality in particular for expressive datasets as shown by both objective and subjective evaluation.
description: Accepted at INTERSPEECH 2023
Heralded magnetism in non-Hermitian atomic systems
Creators: name: Lee, Tony E.
name: Chan, Ching-Kit
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum phase transitions are usually studied in terms of Hermitian Hamiltonians. However, cold-atom experiments are intrinsically non-Hermitian due to spontaneous decay. Here, we show that non-Hermitian systems exhibit quantum phase transitions that are beyond the paradigm of Hermitian physics. We consider the non-Hermitian XY model, which can be implemented using three-level atoms with spontaneous decay. We exactly solve the model in one dimension and show that there is a quantum phase transition from short-range order to quasi-long-range order despite the absence of a continuous symmetry in the Hamiltonian. The ordered phase has a frustrated spin pattern. The critical exponent $ν$ can be 1 or 1/2. Our results can be seen experimentally with trapped ions, cavity QED, and atoms in optical lattices.
description: 7 pages + appendix
Harmonic analysis for pulsar timing arrays
Creators: name: Nay, Jonathan
name: Boddy, Kimberly K.
name: Smith, Tristan L.
name: Mingarelli, Chiara M. F.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We investigate the use of harmonic analysis techniques to perform measurements of the angular power spectrum on mock pulsar timing data for an isotropic stochastic gravitational-wave background (SGWB) with a dimensionless strain amplitude $A_{\text{gw}}=2 \times 10^{-15}$ and spectral index $γ_{\text{gw}}=13/3$. We examine the sensitivity of our harmonic analysis to the number of pulsars (50, 100, and 150) and length of pulsar observation time (10, 20, and 30 years) for an isotropic distribution of pulsars. We account for intrinsic pulsar red noise and use an average value of white noise of ~100 ns. We are able to detect the quadrupole for all our mock harmonic analyses, and for the analysis with 150 pulsars observed for 30 years, we are able to detect up to the $\ell = 5$ multipole. We provide scaling laws for the SGWB amplitude, the quadrupole, and $\ell = 3$ as a function of pulsar observation time and as a function of number of pulsars. We estimate the sensitivity of our harmonic approach to deviations of general relativity that produce subluminal gravitational wave propagation speeds.
description: 18 pages, 12 figures; v2: matches published version
Anderson localization and momentum-space entanglement
Creators: name: Andrade, Eric C.
name: Steudtner, Mark
name: Vojta, Matthias
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider Anderson localization and the associated metal-insulator transition for non-interacting fermions in D = 1, 2 space dimensions in the presence of spatially correlated on-site random potentials. To assess the nature of the wavefunction, we follow a recent proposal to study momentum-space entanglement. For a D = 1 model with long-range disorder correlations, both the entanglement spectrum and the entanglement entropy allow us to clearly distinguish between extended and localized states based upon a single realization of disorder. However, for other models including the D = 2 case with long-range correlated disorder, we find that the method is not similarly successful. We analyze the reasons for its failure, concluding that the much desired generalization to higher dimensions may be problematic.
description: 8 pages, 4 figures. Contribution to J. Stat. Mech. special issue "Quantum Entanglement in Condensed Matter Physics". Minor changes. References added
Dealing with Uncertainty in Future Power Distribution Grid with Reinforcement Learning
Creators: name: Demirel, Gökhan
Publisher: name: Karlsruher Institut für Technologie (KIT)
Year: 2022
Subjects: reinforcement learning
distributed energy resources
power distribution grid

description: In this presentation, we will discuss current research activities that describe the main challenges and opportunities in dealing with uncertainties in distributed energy resources (DERs) combined with reinforcement learning (RL) for the future power distribution grid. It aims to enable the automation control of power systems using artificial intelligence (AI) applied to distribution grids without requiring expert knowledge to develop optimal flexibility policies and improve probabilistic decision-making in future power systems and, from another point of view, to guarantee the resilience of complex power systems.
High-dimensional quantum cryptography with twisted light
Creators: name: Mirhosseini, Mohammad
name: Magaña-Loaiza, Omar S.
name: O'Sullivan, Malcolm N.
name: Rodenburg, Brandon
name: Malik, Mehul
name: Lavery, Martin P. J.
name: Padgett, Miles J.
name: Gauthier, Daniel J.
name: Boyd, Robert W.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Quantum key distributions (QKD) systems often rely on polarization of light for encoding, thus limiting the amount of information that can be sent per photon and placing tight bounds on the error that such a system can tolerate. Here we describe a proof-of-principle experiment that indicates the feasibility of high-dimensional QKD based on the transverse structure of the light field, allowing for the transfer of more than 1 bit per photon. Our implementation uses the orbital angular momentum (OAM) of photons and the corresponding mutually unbiased basis of angular position (ANG). Our experiment uses a digital micro-mirror device for the rapid generation of OAM and ANG modes at 4 kHz, and a mode sorter capable of sorting single photons based on their OAM and ANG content with a separation efficiency of 93\%. Through the use of a 7-dimensional alphabet encoded in the OAM and ANG bases, we achieve a channel capacity of 2.05 bits per sifted photon. Our experiment shows that, in addition to having an increased information capacity, QKD systems based on spatial-mode encoding will be more tolerant to errors and thus more robust against eavesdropping attacks.
Uniform extension of definable $C^{m,ω}$-Whitney jets
Creators: name: Parusiński, Adam
name: Rainer, Armin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Logic (math.LO)
subject: Algebraic Geometry (math.AG)
subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: We show that definable Whitney jets of class $C^{m,ω}$, where $m$ is a nonnegative integer and $ω$ is a modulus of continuity, are the restrictions of definable $C^{m,ω}$-functions; "definable" refers to an arbitrary given o-minimal expansion of the real field. This is true in a uniform way: any definable bounded family of Whitney jets of class $C^{m,ω}$ extends to a definable bounded family of $C^{m,ω}$-functions. We also discuss a uniform $C^m$-version and how the extension depends on the modulus of continuity.
description: 29 pages; a few changes made to improve readability; final version accepted for publication in Pacific Journal of Mathematics; numbering of subsections changed to be consistent with the published version
On the asymptotics of the $α$-Farey transfer operator
Creators: name: Kautzsch, Johannes
name: Kesseböhmer, Marc
name: Samuel, Tony
name: Stratmann, Bernd O.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37A40, 37A25, 37A50, 60K05

description: We study the asymptotics of iterates of the transfer operator for non-uniformly hyperbolic $α$-Farey maps. We provide a family of observables which are Riemann integrable, locally constant and of bounded variation, and for which the iterates of the transfer operator, when applied to one of these observables, is not asymptotic to a constant times the wandering rate on the first element of the partition $α$. Subsequently, sufficient conditions on observables are given under which this expected asymptotic holds. In particular, we obtain an extension theorem which establishes that, if the asymptotic behaviour of iterates of the transfer operator is known on the first element of the partition $α$, then the same asymptotic holds on any compact set bounded away from the indifferent fixed point.
The correspondence between mutually unbiased bases and mutually orthogonal extraordinary supersquares
Creators: name: Ghiu, Iulia
name: Ghiu, Cristian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We study the connection between mutually unbiased bases and mutually orthogonal extraordinary supersquares, a wider class of squares which does not contain only the Latin squares. We show that there are four types of complete sets of mutually orthogonal extraordinary supersquares for the dimension $d=8$. We introduce the concept of physical striation and show that this is equivalent to the extraordinary supersquare. The general algorithm for obtaining the mutually unbiased bases and the physical striations is constructed and it is shown that the complete set of mutually unbiased physical striations is equivalent to the complete set of mutually orthogonal extraordinary supersquares. We apply the algorithm to two examples: one for two-qubit systems ($d=4$) and one for three-qubit systems ($d=8$), by using the Type II complete sets of mutually orthogonal extraordinary supersquares of order 8.
Cambios de temperatura en la Bahía de Todos Santos durante otoño-invierno 91-92 /
Creators: name: Carrillo Bibriezca, Laura E
Publisher: name: Universidad Autónoma de Baja California.
Year: 2022
Subjects: subject: GC167 .M6 C37 1993

description: Se analizan series de tiempo de temperatura de las estaciones Isla y la Jolla en la Bahía de Todos Santos, B.C., registradas con termógrafos digitales submarinos, TDS-1, de viento medido en Punta Morro, B.C. y marea de predicción para el Puerto de Ensenada, B.C Se encuentra que la temperatura promedio máxima en los meses analizados corresponde a octubre y la mínima a enero para ambas estaciones, observando mayor variabilidad en otoño.
Materials challenges for SrRuO3: from conventional to quantum electronics
Creators: name: Cuoco, Mario
name: Di Bernardo, Angelo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The need for faster and more miniaturised electronics is challenging scientists to develop novel forms of electronics based on quantum degrees of freedom different from electron charge. In this fast-developing field, often referred to as quantum electronics, the metal-oxide perovskite SrRuO3 can play an important role thanks to its diverse physical properties, which have been intensively investigated, mostly for conventional electronics. In addition to being chemically stable, easy to fabricate with high quality and to grow epitaxially onto many oxides - these are all desirable properties also for conventional electronics - SrRuO3 has interesting properties for quantum electronics like itinerant ferromagnetism and metallic behaviour, strong correlation between magnetic anisotropy and spin-orbit coupling, strain-tuneable magnetisation, anomalous Hall and Berry effects. In this Research Update, after describing the main phenomena emerging from the interplay between spin, orbital, lattice and topological quantum degrees of freedom in SrRuO3, we discuss the challenges still open to achieve control over these phenomena. We then provide our perspectives on the most promising applications of SrRuO3 for devices for conventional and quantum electronics. We suggest new device configurations and discuss the materials challenges for their realisation. For conventional electronics, we single out applications where SrRuO3 devices can bring competitive advantages over existing ones. For quantum electronics, we propose devices that can help gain a deeper understanding of quantum effects in SrRuO3 to exploit them for quantum technologies. We finally give an outlook about properties of SrRuO3 still waiting for discovery and applications that may stem from them.
description: 61 pages, 15 figures
Gluelump masses and mass splittings from SU(3) lattice gauge theory
Creators: name: Herr, Jannis
name: Schlosser, Carolin
name: Wagner, Marc
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We compute gluelump masses and mass differences using SU(3) lattice gauge theory. We study states with total angular momentum up to $J = 3$, parity $P = +,-$ and charge conjugation $C = +,-$. Computations on four ensembles with rather fine lattice spacings in the range $0.040 \, \text{fm} \ldots 0.093 \, \text{fm}$ allow continuum extrapolations of gluelump mass differences. We complement existing results on hybrid static potentials with the obtained gluelump masses, which represent the limit of vanishing quark-antiquark separation. We also discuss the conversion of lattice gluelump masses to the Renormalon Subtracted scheme, which is e.g. important for studies of heavy hybrid mesons in the Born-Oppenheimer approximation.
description: 35 pages, 11 figures, 10 tables
Bayesian Reconstruction of the Velocity Distribution of Weakly Interacting Massive Particles from Direct Dark Matter Detection Data
Creators: name: Shan, Chung-Lin
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper, we extended our earlier work on the reconstruction of the (time-averaged) one-dimensional velocity distribution of Galactic Weakly Interacting Massive Particles (WIMPs) and introduce the Bayesian fitting procedure to the theoretically predicted velocity distribution functions. In this reconstruction process, the (rough) velocity distribution reconstructed by using raw data from direct Dark Matter detection experiments directly, i.e. measured recoil energies, with one or more different target materials, has been used as "reconstructed-input" information. By assuming a fitting velocity distribution function and scanning the parameter space based on the Bayesian analysis, the astronomical characteristic parameters, e.g. the Solar and Earth's Galactic velocities, will be pinned down as the output results. Our Monte-Carlo simulations show that this Bayesian scanning procedure could reconstruct the true (input) WIMP velocity distribution function pretty precisely with negligible systematic deviations of the reconstructed characteristic Solar and Earth's velocities and 1 sigma statistical uncertainties of
description: 62 pages, 36 figures (121 eps plots), 18 tables; v2: revised version, compacted for publication