cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Queer modes of survival: a cultural analysis of responses to gender, sexual, and racial marginalization in California’s Central Valley
Creators: name: Salazar, Jillian Crystal
Publisher: name: No Publisher Supplied
Year: 2022

description: The field of Women's and Gender Studies has largely oriented itself toward the geographies and socialities of large metropolitan cities. In contrast, "Queer Modes of Survival: A Cultural Analysis of Responses to Gender, Sexual, and Racial Marginalization in California’s Central Valley" seeks to reorient the field to the theory and praxis that can be gleaned from a focus on overlooked rural regions like the Central Valley of California. I reveal how the particularities of life in the heart of U.S. agribusiness both marks marginalized communities for early death, but also how those communities come up against the limits placed upon them. I argue that the relationship between the space of the Central Valley, the people who live there, and the imaginary of the space creates social and geographic isolation resulting in people of the Central Valley not being meaningfully tied to existing modes of survival, and thus they create their own queer modes of survival.To tell this story about survival in an overlooked region, I use a multi-method approach combining archival, autobiographical, film theory, and literary methodologies to analyze oral histories, personal memory, ephemera, a film, a play, and a novel. The result is a new account of the places the field of Women's and Gender Studies can and should look for theory about surviving a world facing environmental change, infrastructural neglect, and economic decline. I conclude that having the field of Women's and Gender Studies contend with overlooked regions forces us to rethink what counts as survival, meaningful life, and requisite theory.
$Ξ_c γ\rightarrowΞ^\prime_c$ transition in lattice QCD
Creators: name: Bahtiyar, H.
name: Can, K. U.
name: Erkol, G.
name: Oka, M.
name: Takahashi, T. T.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We evaluate the electromagnetic $Ξ_c γ\rightarrowΞ_c^\prime$ transition on 2+1 flavor lattices corresponding to a pion mass of $\sim 156$ MeV. We extract the magnetic Sachs and Pauli form factors which give the $Ξ_c$-$Ξ_c^\prime$ transition magnetic moment and the decay rates of $Ξ_c^\prime$ baryons. We did not find a signal for the magnetic form factor of the neutral transition $Ξ_c^0 γ\rightarrowΞ_c^{\prime 0}$, which is suppressed by the U-spin flavor symmetry. As a byproduct, we extract the magnetic form factors and the magnetic moments of $Ξ_c$ and $Ξ_c^\prime$ baryons, which give an insight to the dynamics of $u/d$, $s$ and $c$ quarks having masses at different scales.
description: 8 pages, 2 figures. Version published in Phys. Lett. B
Pseudo-symmetric random matrices: semi-Poisson and sub-Wigner statistics
Creators: name: Kumar, Sachin
name: Ahmed, Zafar
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Real non-symmetric matrices may have either real or complex conjugate eigenvalues. These matrices can be seen to be pseudo-symmetric as $ηM η^{-1} = M^t$, where the metric $η$ could be secular (a constant matrix) or depending upon the matrix elements of $M$. Here, we construct ensembles of a large number $N$ of pseudo-symmetric $n \times n$ ($n$ large) matrices using ${\cal N}$ $(n(n+1)/2 \le {\cal N} \le n^2)$ independent and identically distributed (iid) random numbers as their elements. Based on our numerical calculations, we conjecture that for these ensembles the Nearest Level Spacing Distributions (NLSDs: $p(s)$) are sub-Wigner as $p_{abc}(s)=a s e^{-bs^c} (0
description: 7 pages, 5 figures and 1 table, 3 New Refs. added, to appear in Phys. Rev. E
Notes on Spinning Operators in Fermionic CFT
Creators: name: Giombi, S.
name: Kirilin, V.
name: Skvortsov, E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Gross-Neveu model defines a unitary CFT of interacting fermions in $2
description: 37 pages, 1 figure. v2: minor corrections
On Banach spaces of vector-valued random variables and their duals motivated by risk measures
Creators: name: Kalmes, Thomas
name: Pichler, Alois
Publisher: name: arXiv
Year: 2017
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E30, 46E40, 62P05

description: We introduce Banach spaces of vector-valued random variables motivated from mathematical finance. So-called risk functionals are defined in a natural way on these Banach spaces and it is shown that these functionals are Lipschitz continuous. The risk functionals cannot be defined on strictly larger spaces of random variables which creates a particular interest for the spaces presented. We elaborate key properties of these Banach spaces and give representations of their dual spaces in terms of vector measures with values in the dual space of the state space.
description: 33 pages
Thermodynamic Limits of Electronic Systems
Creators: name: Gontier, David
name: Lu, Jianfeng
name: Ortner, Christoph
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We review thermodynamic limits and scaling limits of electronic structure models for condensed matter. We discuss several mathematical ways to implement these limits in three models of increasing chemical complexity and mathematical difficulty: (1) Thomas-Fermi like models; (2) Hartree-Fock like models; and (3) Kohn-Sham density functional theory models.
Novel cosmic-ray electron and positron constraints on MeV dark matter particles
Creators: name: Boudaud, Mathieu
name: Lavalle, Julien
name: Salati, Pierre
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: MeV dark matter (DM) particles annihilating or decaying to electron-positron pairs cannot, in principle, be observed via local cosmic-ray (CR) measurements because of the shielding solar magnetic field. In this letter, we take advantage of spacecraft Voyager 1's capacity for detecting interstellar CRs since it crossed the heliopause in 2012. This opens up a new avenue to probe DM in the sub-GeV energy/mass range that we exploit here for the first time. From a complete description of the transport of electrons and positrons at low energy, we derive predictions for both the secondary astrophysical background and the pair production mechanisms relevant to DM annihilation or decay down to the MeV mass range. Interestingly, we show that reacceleration may push positrons up to energies larger than the DM particle mass. We combine the constraints from the Voyager and AMS-02 data to get novel limits covering a very extended DM particle mass range, from MeV to TeV. In the MeV mass range, our limits reach annihilation cross sections of order $\langle σv\rangle \sim 10^{-28}{\rm cm^3/s}$. An interesting aspect is that these limits barely depend on the details of cosmic-ray propagation in the weak reacceleration case, a configuration which seems to be favored by the most recent boron-to-carbon ($B/C$) data. Though extracted from a completely different and new probe, these bounds have a strength similar to those obtained with the cosmic microwave background --- they are even more stringent for $p$-wave annihilation.
description: 7 pages, 5 figures (including supplemental material). Matches the version to appear in PRL
WIP: Development of a Student-Centered Personalized Learning Framework to Advance Undergraduate Robotics Education
Creators: name: Shill, Ponkoj Chandra
name: Wu, Rui
name: Jamali, Hossein
name: Hutchins, Bryan
name: Dascalu, Sergiu
name: Harris, Frederick C.
name: Feil-Seifer, David
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: This paper presents a work-in-progress on a learn-ing system that will provide robotics students with a personalized learning environment. This addresses both the scarcity of skilled robotics instructors, particularly in community colleges and the expensive demand for training equipment. The study of robotics at the college level represents a wide range of interests, experiences, and aims. This project works to provide students the flexibility to adapt their learning to their own goals and prior experience. We are developing a system to enable robotics instruction through a web-based interface that is compatible with less expensive hardware. Therefore, the free distribution of teaching materials will empower educators. This project has the potential to increase the number of robotics courses offered at both two- and four-year schools and universities. The course materials are being designed with small units and a hierarchical dependency tree in mind; students will be able to customize their course of study based on the robotics skills they have already mastered. We present an evaluation of a five module mini-course in robotics. Students indicated that they had a positive experience with the online content. They also scored the experience highly on relatedness, mastery, and autonomy perspectives, demonstrating strong motivation potential for this approach.
description: 5 pages, 2 figures, conference
Dynamical amplification of magnetoresistances and Hall currents up to the THz regime
Creators: name: Guimarães, Filipe S. M.
name: Dias, Manuel dos Santos
name: Bouaziz, Juba
name: Costa, Antonio T.
name: Muniz, Roberto B.
name: Lounis, Samir
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin-orbit-related effects offer a highly promising route for reading and writing information in magnetic units of future devices. These phenomena rely not only on the static magnetization orientation but also on its dynamics to achieve fast switchings that can reach the THz range. In this work, we consider Co/Pt and Fe/W bilayers to show that accounting for the phase difference between different processes is crucial to the correct description of the dynamical currents. By tuning each system towards its ferromagnetic resonance, we reveal that dynamical spin Hall angles can non-trivially change sign and be boosted by over 500%, reaching giant values. We demonstrate that charge and spin pumping mechanisms can greatly magnify or dwindle the currents flowing through the system, influencing all kinds of magnetoresistive and Hall effects, thus impacting also dc and second harmonic experimental measurements.
description: 19 pages, 4 figures, Supplementary Information
Privacy-Protecting Energy Management Unit through Model-Distribution Predictive Control
Creators: name: Chin, Jun-Xing
name: De Rubira, Tomas Tinoco
name: Hug, Gabriela
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The roll-out of smart meters in electricity networks introduces risks for consumer privacy due to increased measurement frequency and granularity. Through various Non-Intrusive Load Monitoring techniques, consumer behavior may be inferred from their metering data. In this paper, we propose an energy management method that reduces energy cost and protects privacy through the minimization of information leakage. The method is based on a Model Predictive Controller that utilizes energy storage and local generation, and that predicts the effects of its actions on the statistics of the actual energy consumption of a consumer and that seen by the grid. Computationally, the method requires solving a Mixed-Integer Quadratic Program of manageable size whenever new meter readings are available. We simulate the controller on generated residential load profiles with different privacy costs in a two-tier time-of-use energy pricing environment. Results show that information leakage is effectively reduced at the expense of increased energy cost. The results also show that with the proposed controller the consumer load profile seen by the grid resembles a mixture between that obtained with Non-Intrusive Load Leveling and Lazy Stepping.
description: Accepted for publication in IEEE Transactions on Smart Grid 2017, special issue on Distributed Control and Efficient Optimization Methods for Smart Grid
title: Mantle melting, mineralogy and (maybe) magma oceans: the metal stable isotope perspective
Creators: name: Williams, Helen M
name: Soderman, Caroline
name: Matthews, Simon
name: Landon-Browne, Ayesha
Publisher: name: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
Year: 2022

description:
Many studies of high-amu stable isotope systems (e.g., Mg, Si, Fe, Ni, Zn, Ti, Ca, Cr, V) in terrestrial magmatic rocks and silicate achondrite meteorites aim to link equilibrium mineral- and redox-specific stable isotope partitioning (equilibrium fractionation) effects with observed variations in isotopic composition, with the objectives of reconstructing the chemistry, mineralogy and redox state of their mantle source regions. In this presentation, I will discuss how these stable isotope systems can be used in conjunction with phase equilibria models to predict the coupled behaviour of different isotope systems during partial melting of different mantle lithologies under different conditions, and the implications for using these isotope systems to reconstruct the mineralogical and chemical evolution of planetary interiors.  

Soderman, C. R., Matthews, S., Shorttle, O., Jackson, M. G., Ruttor, S., Nebel, O., ... & Williams, H. M. (2021). Heavy δ57Fe in ocean island basalts: A non-unique signature of processes and source lithologies in the mantle. GCA

Soderman, C. R., Shorttle, O., Matthews, S., & Williams, H. M. (2022). Global trends in novel stable isotopes in basalts: Theory and observations. GCA
Casimir effects in Lorentz-violating scalar field theory
Creators: name: Cruz, M. B.
name: de Mello, E. R. Bezerra
name: Petrov, A. Yu.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we consider a Lorentz-breaking extension of the theory for a real massive scalar quantum field in the region between two large parallel plates, with our manner to break the Lorentz symmetry is CPT-even, aether-like. For this system we calculated the Casimir energy considering different boundary conditions. It turns out to be that the Casimir energy strongly depends on the direction of the constant vector implementing the Lorentz symmetry breaking, as well as on the boundary conditions.
description: 22 pages, version accepted to PRD
MPEC 2023-R152 : 2023 RM5
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 RM5

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Structured Deep Hashing with Convolutional Neural Networks for Fast Person Re-identification
Creators: name: Wu, Lin
name: Wang, Yang
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Given a pedestrian image as a query, the purpose of person re-identification is to identify the correct match from a large collection of gallery images depicting the same person captured by disjoint camera views. The critical challenge is how to construct a robust yet discriminative feature representation to capture the compounded variations in pedestrian appearance. To this end, deep learning methods have been proposed to extract hierarchical features against extreme variability of appearance. However, existing methods in this category generally neglect the efficiency in the matching stage whereas the searching speed of a re-identification system is crucial in real-world applications. In this paper, we present a novel deep hashing framework with Convolutional Neural Networks (CNNs) for fast person re-identification. Technically, we simultaneously learn both CNN features and hash functions/codes to get robust yet discriminative features and similarity-preserving hash codes. Thereby, person re-identification can be resolved by efficiently computing and ranking the Hamming distances between images. A structured loss function defined over positive pairs and hard negatives is proposed to formulate a novel optimization problem so that fast convergence and more stable optimized solution can be obtained. Extensive experiments on two benchmarks CUHK03 \cite{FPNN} and Market-1501 \cite{Market1501} show that the proposed deep architecture is efficacy over state-of-the-arts.
description: To appear at Computer Vision and Image Understanding
Optical spin transfer and spin-orbit torques in thin film ferromagnets
Creators: name: Li, Junwen
name: Haney, Paul M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the optically induced torques in thin film ferromagnetic layers under excitation by circularly polarized light. We study cases both with and without Rashba spin-orbit coupling using a 4-band model. In the absence of Rashba spin-orbit coupling, we derive an analytic expression for the optical torques, revealing the conditions under which the torque is mostly derived from optical spin transfer torque (i.e. when the torque is along the direction of optical angular momentum), versus when the torque is derived from the inverse Faraday effect (i.e. when the torque is perpendicular to the optical angular momentum). We find the optical spin transfer torque dominates provided that the excitation energy is far away from band edge transitions, and the magnetic exchange splitting is much greater than the lifetime broadening. For the case with large Rashba spin-orbit coupling and out-of-plane magnetization, we find the torque is generally perpendicular to the photon angular momentum and is ascribed to an optical Edelstein effect.
description: 10 pages, 5 figures
A new formulation of Lee-Wick quantum field theory
Creators: name: Anselmi, Damiano
name: Piva, Marco
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The Lee-Wick models are higher-derivative theories that are claimed to be unitary thanks to a peculiar cancelation mechanism. In this paper, we provide a new formulation of the models, to clarify several aspects that have remained quite mysterious, so far. Specifically, we define them as nonanalytically Wick rotated Euclidean theories. The complex energy plane is divided into disconnected regions, which can be related to one another by a well-defined, albeit nonanalytic procedure. Working in a generic Lorentz frame, the models are intrinsically equipped with the right recipe to treat the pinchings of the Lee-Wick poles, with no need of external ad hoc prescriptions. We describe these features in detail by calculating the one-loop bubble diagram and explaining how the key properties generalize to more complicated diagrams. The physical results of our formulation are different from those of the previous ones. The unusual behaviors of the physical amplitudes lead to interesting phenomenological predictions.
description: 27 pages, 17 figures; v2: details about Lorentz invariance above LW thresholds; v3: minor changes, JHEP
Collecting Visually-Grounded Dialogue with A Game Of Sorts
Creators: name: Willemsen, Bram
name: Kalpakchi, Dmytro
name: Skantze, Gabriel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: An idealized, though simplistic, view of the referring expression production and grounding process in (situated) dialogue assumes that a speaker must merely appropriately specify their expression so that the target referent may be successfully identified by the addressee. However, referring in conversation is a collaborative process that cannot be aptly characterized as an exchange of minimally-specified referring expressions. Concerns have been raised regarding assumptions made by prior work on visually-grounded dialogue that reveal an oversimplified view of conversation and the referential process. We address these concerns by introducing a collaborative image ranking task, a grounded agreement game we call "A Game Of Sorts". In our game, players are tasked with reaching agreement on how to rank a set of images given some sorting criterion through a largely unrestricted, role-symmetric dialogue. By putting emphasis on the argumentation in this mixed-initiative interaction, we collect discussions that involve the collaborative referential process. We describe results of a small-scale data collection experiment with the proposed task. All discussed materials, which includes the collected data, the codebase, and a containerized version of the application, are publicly available.
description: Published at LREC 2022
A conservative scheme for electromagnetic simulation of magnetized plasmas with kinetic electrons
Creators: name: Bao, J.
name: Lin, Z.
name: Lu, Z. X.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A conservative scheme has been formulated and verified for gyrokinetic particle simulations of electromagnetic waves and instabilities in magnetized plasmas. An electron continuity equation derived from drift kinetic equation is used to time advance electron density perturbation by using the perturbed mechanical flow calculated from the parallel vector potential, and the parallel vector potential is solved by using the perturbed canonical flow from the perturbed distribution function. In gyrokinetic particle simulations using this new scheme, shear Alfvén wave dispersion relation in shearless slab and continuum damping in sheared cylinder have been recovered. The new scheme overcomes the stringent requirement in conventional perturbative simulation method that perpendicular grid size needs to be as small as electron collisionless skin depth even for the long wavelength Alfvén waves. The new scheme also avoids the problem in conventional method that an unphysically large parallel electric field arises due to the inconsistency between electrostatic potential calculated from the perturbed density and vector potential calculated from the perturbed canonical flow. Finally, the gyrokinetic particle simulations of the Alfvén waves in sheared cylinder have superior numerical properties compared with the fluid simulations, which suffer from numerical difficulties associated with singular mode structures.
Local bulk physics from intersecting modular Hamiltonians
Creators: name: Kabat, Daniel
name: Lifschytz, Gilad
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that bulk quantities localized on a minimal surface homologous to a boundary region correspond in the CFT to operators that commute with the modular Hamiltonian associated with the boundary region. If two such minimal surfaces intersect at a point in the bulk then CFT operators which commute with both extended modular Hamiltonians must be localized at the intersection point. We use this to construct local bulk operators purely from CFT considerations, without knowing the bulk metric, using intersecting modular Hamiltonians. For conformal field theories at zero and finite temperature the appropriate modular Hamiltonians are known explicitly and we recover known expressions for local bulk observables.
description: 28 pages, LaTeX. v2: additional discussion of extended modular Hamiltonian. v3: version to appear in JHEP
title: Revised lithostratigraphy of the Paleoproterozoic Porkonen banded iron formation and associated sulphidic shales, Northern Finland
Creators: name: Sakellaris, Grigorios Aarne
Publisher: name: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
Year: 2022

description:
The Palaeoproterozoic (~2.0 Ga) Porkonen Formation in the Kittilä greenstone belt (or terrane) in northern Finland is an exceptionally well-preserved succession of banded iron formation, shale-dominated units and submarine lava. The Formation comprises six distinct lithological units that from the base upwards include: a. massive chert b. banded magnetite±siderite-chert (iron ore) c. (Mn)siderite±chlorite-chert d. iron sulphide-rich black shale and breccia (3) tuffaceous shale and tuff and, (4) andesite/rhyolite.

The iron ore has a thickness of approx. 8 meters, laterally discontinuous (<12 km) and an average Fe content of 30.5%. The overlying manganese-rich siderite horizon (3-5m) has an average of 2% Mn, whereas the following 7m thick, sulphide-rich black shale averages at 27% Fe showing a maximum content of 47.9% Fe in one-meter interval. The latter shows elevated contents in Zn, Cu, Ni, Ag, Cd and Au.

All lithological units consist of low-grade metamorphic mineral assemblages, exhibiting primary sedimentary and early diagenetic features, and have contacts typically conformable and gradating.

Single-grain layering of micron-sized magnetite alternating with micritic carbonate, apatite and chert characterize the iron-oxide bands whereas primary colloidal textures, abundant contractional fractures, graphite-stylolites and crackle microbreccia characterize the chert bands. In the shale-dominated units the rhythmic, planar-parallel lamination of authigenic carbonates, diagenetic pyrite, and chert and pyrite nodules, have been contorted by penecontamporenous soft-sediment deformation manifested by slump structures, load casts, and intraformational breccia with angular graphite fragments in a massive iron-sulphide matrix.

The lithostratigraphy may predict a layered -in oxygen ocean with hydrothermally-dominated Fe-Mn-rich deep water mass.
On the topology of real Bott manifolds
Creators: name: Dsouza, Raisa
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: Primary: 55R99, Secondary: 57S25

description: The main aim of this article is to give a necessary and sufficient condition for a real Bott manifold to admit a spin structure and further give a combinatorial characterization for the spin structure in terms of the associated acyclic digraph.
description: 19 pages, 4 figures. It is a combination of some results from arXiv:1609.05630 and some new results
Metric on the space of quantum states from relative entropy. Tomographic reconstruction
Creators: name: Man'ko, Vladimir I.
name: Marmo, Giuseppe
name: Ventriglia, Franco
name: Vitale, Patrizia
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In the framework of quantum information geometry, we derive, from quantum relative Tsallis entropy, a family of quantum metrics on the space of full rank, N level quantum states, by means of a suitably defined coordinate free differential calculus. The cases N = 2, N = 3 are discussed in detail and notable limits are analyzed. The radial limit procedure has been used to recover quantum metrics for lower rank states, such as pure states. By using the tomographic picture of quantum mechanics we have obtained the Fisher- Rao metric for the space of quantum tomograms and derived a reconstruction formula of the quantum metric of density states out of the tomographic one. A new inequality obtained for probabilities of three spin-1/2 projections in three perpendicular directions is proposed to be checked in experiments with superconducting circuits.
description: 31 pages. No figures. Abstract and Introduction rewritten. Minor corrections. References added
ANEXO 5: Homocedasticidad y normalidad en modelos de regresión lineal
Creators: name: García-Herrero, Marina
Publisher: name: Zenodo
Year: 2023
Subjects: Modelo de regresión lineal de equidad como igualdad de resultados
Modelo de regresión lineal de equidad como igualdad de oportunidades

description: Homocedasticidad y normalidad en modelos de regresión lineal de equidad como igualdad de resultados y de equidad como igualdad de oportunidades
Three-band Hubbard model for Na$_2$IrO$_3$: Topological insulator, zigzag antiferromagnet, and Kitaev-Heisenberg material
Creators: name: Laubach, Manuel
name: Reuther, Johannes
name: Thomale, Ronny
name: Rachel, Stephan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Na$_2$IrO$_3$ was one of the first materials proposed to feature the Kane-Mele type topological insulator phase. Contemporaneously it was claimed that the very same material is in a Mott insulating phase which is described by the Kitaev-Heisenberg (KH) model. First experiments indeed revealed Mott insulating behavior in conjunction with antiferromagnetic long-range order. Further refined experiments established antiferromagnetic order of zigzag type which is not captured by the KH model. Since then several extensions and modifications of the KH model were proposed in order to describe the experimental findings. Here we suggest that adding charge fluctuations to the KH model represents an alternative explanation of zigzag antiferromagnetism. Moreover, a phenomenological three-band Hubbard model unifies all the pieces of the puzzle: topological insulator physics for weak and KH model for strong electron-electron interactions as well as a zigzag antiferromagnet at intermediate interaction strength.
description: 5 pages, 3 figures; v2 (as published): added discussion about kinetic energy scale C; more realistic values of C shift the zigzag AFM phase to larger values of U
Modular Inflation Observables and $j$-Inflation Phenomenology
Creators: name: Schimmrigk, Rolf
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Modular inflation is the restriction to two fields of automorphic inflation, a general group based framework for multifield scalar field theories with curved target spaces, which can be parametrized by the comoving curvature perturbation ${\cal R}$ and the isocurvature perturbation tensor $S^{IJ}$. This paper describes the dynamics and observables of these perturbations and considers in some detail the special case of modular inflation as an extensive class of two-field inflation theories with a conformally flat target space. It is shown that the nonmodular nature of derivatives of modular forms leads to CMB observables in modular invariant inflation theories that are in general constructed from almost holomorphic modular forms. The phenomenology of the model of $j$-inflation is compared to the recent observational constraints from the Planck satellite and the BICEP2/Keck Array data.
description: 39 pages, 3 figures. This extended version includes a detailed discussion of the almost holomorphic nature of the physical observables in modular invariant inflation theories
Dissipative Instability of Magnetohydrodynamic Sausage Waves in a Compressional Cylindrical Plasma: Effect of Flow Shear and Viscosity Shear
Creators: name: Yu, D. J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The shear flow influences the stability of magnetohydrodynamic (MHD) waves. In the presence of a dissipation mechanism, flow shear may induce a MHD wave instability below the threshold of the Kelvin-Helmholtz instability (KHI), which is called dissipative instability (DI). This phenomenon is also called negative energy wave instability (NEWI) because it is closely related to the backward wave which has negative wave energy. Considering viscosity as a dissipation mechanism, we derive an analytical dispersion relation for the slow sausage modes in a straight cylinder with a discontinuous boundary. It is assumed that the steady flow is inside and dynamic and bulk viscosities are outside the circular flux tube under photospheric condition. When the two viscosities are weak, it is found that for the slow surface mode, the growth rate is proportional to the axial wavenumber and flow shear, consistent with in the incompressible limit. For a slow body mode, the growth rate has a peak at certain axial wavenumber and its order of magnitude is similar to surface mode. The linear relationship between the growth rate and the dynamic viscosity established in the incompressible limit develops nonlinearly when the flow shear and/or the two viscosities are sufficiently strong.
description: 11 pages, 10 figures
Patterns of New Physics in $b\to s\ell^+\ell^-$ transitions in the light of recent data
Creators: name: Capdevila, Bernat
name: Crivellin, Andreas
name: Descotes-Genon, Sébastien
name: Matias, Joaquim
name: Virto, Javier
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the Standard Model (SM), the rare transitions where a bottom quark decays into a strange quark and a pair of light leptons exhibit a potential sensitivity to physics beyond the SM. In addition, the SM embeds Lepton Flavour Universality (LFU), leading to almost identical probabilities for muon and electron modes. The LHCb collaboration discovered a set of deviations from the SM expectations in decays to muons and also in ratios assessing LFU. Other experiments (Belle, ATLAS, CMS) found consistent measurements, albeit with large error bars. We perform a global fit to all available $b\to s\ell^+\ell^-$ data ($\ell=e,μ$) in a model-independent way allowing for different patterns of New Physics. For the first time, the NP hypothesis is preferred over the SM by $5\,σ$ in a general case when NP can enter SM-like operators and their chirally-flipped partners. LFU violation is favoured with respect to LFU at the 3-4$\,σ$ level. We discuss the impact of LFU-violating New Physics on the observable $P_5^\prime$ from $B \to K^*μ^+μ^-$ and we compare our estimate for long-distance charm contributions with an empirical model recently proposed by a group of LHCb experimentalists. Finally, we discuss NP models able to describe this consistent pattern of deviations.
description: 13 pages, 6 figures. Accepted for publication in JHEP
Quark Seesaw, Dark $U(1)$ symmetry and Baryon-Dark Matter Coincidence
Creators: name: Gu, Pei-Hong
name: Mohapatra, Rabindra N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We attempt to understand the baryon-dark-matter coincidence problem within the quark seesaw extension of the standard model where parity invariance is used to solve the strong CP problem. The $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ gauge symmetry of this model is extended by a dark $U(1)_X$ group plus inclusion of a heavy neutral vector-like fermion $χ_{L,R}$ charged under the dark group which plays the role of dark matter. All fermions are Dirac type in this model. Decay of heavy scalars charged under $U(1)_X$ leads to simultaneous asymmetry generation of the dark matter and baryons after sphaleron effects are included. The $U(1)_X$ group not only helps to stabilize the dark matter but also helps in the elimination of the symmetric part of the dark matter via $χ-\barχ$ annihilation. For dark matter mass near the proton mass, it explains why the baryon and dark matter abundances are of similar magnitude (the baryon-dark-matter coincidence problem). This model is testable in low threshold (sub-keV) direct dark matter search experiments.
description: 7 pages. Minor corrections and improvements. Accepted by PRD
title: OneGeochemistry; Paving the way to true Interoperability in Geochemistry Data
Creators: name: Prent, Alexander Martijn
name: Klöcking, Marthe
name: Wyborn, Lesley
name: Lehnert, Kerstin
name: Elger, Kirsten
name: Hezel, Dominik
name: Profeta, Lucia
name: ter Maat, Geertje
Publisher: name: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
Year: 2022

description:
Geochemical data have been collected since the 19th century and are essential for geoscientific research as well as contributing to solving societal issues. Typically local or regional questions are solved with single datasets that can be measured in megabytes. However, solving more complex research questions requires many datasets to be compiled into single large ones to find answers through multidimensional analyses, statistics, AI and ML. Compiling such collections to allow computations is often a painstakingly lengthy and manual process.

Coming to an age in which we are dealing with global challenges, only large scale geochemical data collections can contribute to solving these. Projects such as EarthChem and GEOROC have come a long way and continue to set the bar. Whilst these projects have made geochemical data easily findable and accessible, interoperability to other global data systems is still lacking. To make these data truly FAIR, a minimum set of standards and best-practices for data publication need to be agreed on by the global geochemical community. And rather than re-inventing the wheel, we should follow the example of the highly standardized sample and data management strategies of, e.g., IODP cruises, NASA missions, or the seismology and OneGeology communities.

The recently formed OneGeochemistry initiative aims to bring together and ensure that all decisions are made in conference with the international geochemical community. The large international societies will have to play a key role here, their message supported and amplified by funders and national initiatives across the globe.
Vacuum Cherenkov radiation for Lorentz-violating fermions
Creators: name: Schreck, M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The current work focuses on the process of vacuum Cherenkov radiation for Lorentz-violating fermions that are described by the minimal Standard-Model Extension (SME). To date, most considerations of this important hypothetical process have been restricted to Lorentz-violating photons, as the necessary theoretical tools for the SME fermion sector have not been available. With their development in a very recent paper, we are now in a position to compute the decay rates based on a modified Dirac theory. Two realizations of the Cherenkov process are studied. In the first scenario, the spin projection of the incoming fermion is assumed to be conserved, and in the second, the spin projection is allowed to flip. The first type of process is shown to be still forbidden for the dimensionful $a$ and $b$ coefficients where there are strong indications that it is energetically disallowed for the $H$ coefficients, as well. However, it is rendered possible for the dimensionless $c$, $d$, $e$, $f$, and $g$ coefficients. For large initial fermion energies, the decay rates for the $c$ and $d$ coefficients were found to grow linearly with momentum and to be linearly suppressed by the smallness of the Lorentz-violating coefficient where for the $e$, $f$, and $g$ coefficients this suppression is even quadratic. The decay rates vanish in the vicinity of the threshold, as expected. The decay including a fermion spin flip plays a role for the spin-nondegenerate operators and it was found to occur for the dimensionful $b$ and $H$ coefficients as well as for the dimensionless $d$ and $g$. The characteristics of this process differ much from the properties of the spin-conserving one, e.g., there is no threshold. Based on experimental data of ultra-high-energy cosmic rays, new constraints on Lorentz violation in the quark sector are obtained from the thresholds.
description: 59 pages, 6 figures, final version matching article published in Phys. Rev. D
CARE: Confidence-rich Autonomous Robot Exploration using Bayesian Kernel Inference and Optimization
Creators: name: Xu, Yang
name: Zheng, Ronghao
name: Zhang, Senlin
name: Liu, Meiqin
name: Huang, Shoudong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Robotics (cs.RO)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper, we consider improving the efficiency of information-based autonomous robot exploration in unknown and complex environments. We first utilize Gaussian process (GP) regression to learn a surrogate model to infer the confidence-rich mutual information (CRMI) of querying control actions, then adopt an objective function consisting of predicted CRMI values and prediction uncertainties to conduct Bayesian optimization (BO), i.e., GP-based BO (GPBO). The trade-off between the best action with the highest CRMI value (exploitation) and the action with high prediction variance (exploration) can be realized. To further improve the efficiency of GPBO, we propose a novel lightweight information gain inference method based on Bayesian kernel inference and optimization (BKIO), achieving an approximate logarithmic complexity without the need for training. BKIO can also infer the CRMI and generate the best action using BO with bounded cumulative regret, which ensures its comparable accuracy to GPBO with much higher efficiency. Extensive numerical and real-world experiments show the desired efficiency of our proposed methods without losing exploration performance in different unstructured, cluttered environments. We also provide our open-source implementation code at https://github.com/Shepherd-Gregory/BKIO-Exploration.
description: Full version for the paper accepted by IEEE Robotics and Automation Letters (RA-L) 2023. arXiv admin note: text overlap with arXiv:2301.00523
Matrix Quantum Mechanics on $S^{1}/{\mathbb Z}_{2}$
Creators: name: Betzios, Panagiotis
name: Gürsoy, Umut
name: Papadoulaki, Olga
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study Matrix Quantum Mechanics on the Euclidean time orbifold $S_1/\mathbb{Z}_2$. Upon Wick rotation to Lorentzian time and taking the double-scaling limit this theory provides a toy model for a big-bang/big crunch universe in two dimensional non-critical string theory where the orbifold fixed points become cosmological singularities. We derive the MQM partition function both in the canonical and grand canonical ensemble in two different formulations and demonstrate agreement between them. We pinpoint the contribution of twisted states in both of these formulations either in terms of bi-local operators acting at the end-points of time or branch-cuts on the complex plane. We calculate, in the matrix model, the contribution of the twisted states to the torus level partition function explicitly and show that it precisely matches the world-sheet result, providing a non-trivial test of the proposed duality. Finally we discuss some interesting features of the partition function and the possibility of realising it as a $τ$-function of an integrable hierarchy.
description: 36+24 pages, 4 figures; performed the matching with Liouville, improved discussion
Weak-value amplification and optimal parameter estimation in the presence of correlated noise
Creators: name: Sinclair, Josiah
name: Hallaji, Matin
name: Steinberg, Aephraim M.
name: Tollaksen, Jeff
name: Jordan, Andrew N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analytically and numerically investigate the performance of weak-value amplification (WVA) and related parameter estimation methods in the presence of temporally correlated noise. WVA is a special instance of a general measurement strategy that involves sorting data into separate subsets based on the outcome of a second "partitioning" measurement. Using a simplified noise model that can be analyzed exactly together with optimal statistical estimators, we compare WVA to a conventional measurement method. We find that introducing WVA indeed yields a much lower variance of the parameter of interest than does the conventional technique, optimized in the absence of any partitioning measurements. In contrast, a statistically optimal analysis that employs partitioning measurements, incorporating all partitioned results and their known correlations, is found to yield an improvement -- typically slight -- over the noise reduction achieved by WVA. This is because the simple WVA technique is not tailored to a given noise environment and therefore does not make use of correlations between the different partitions. We also compare WVA to traditional background subtraction, a familiar technique where measurement outcomes are partitioned to eliminate unknown offsets or errors in calibration. Surprisingly, in our model background subtraction turns out to be a special case of the optimal partitioning approach in the balanced case, possessing a similar typically slight advantage over WVA. These results give deeper insight into the role of partitioning measurements, with or without post-selection, in enhancing measurement precision, which some have found puzzling. We finish by presenting numerical results to model a more realistic laboratory situation of time-decaying correlations, showing our conclusions hold for a wide range of statistical models.
description: Revisions incorporate feedback from reviewers
Brief History of Ultra-light Scalar Dark Matter Models
Creators: name: Lee, Jae-Weon
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This is a review on the brief history of the scalar field dark matter model also known as fuzzy dark matter, BEC dark matter, wave dark matter, or ultra-light axion. In this model ultra-light scalar dark matter particles with mass $m = O(10^{-22})eV$ condense in a single Bose-Einstein condensate state and behave collectively like a classical wave. Galactic dark matter halos can be described as a self-gravitating coherent scalar field configuration called boson stars. At the scale larger than galaxies the dark matter acts like cold dark matter, while below the scale quantum pressure from the uncertainty principle suppresses the smaller structure formation so that it can resolve the small scale crisis of the conventional cold dark matter model.
description: 5 pages