cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Role reversal in first and second sound in a relativistic superfluid
Creators: name: Alford, Mark G.
name: Mallavarapu, S. Kumar
name: Schmitt, Andreas
name: Stetina, Stephan
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Relativistic superfluidity at arbitrary temperature, chemical potential and (uniform) superflow is discussed within a self-consistent field-theoretical approach. Our starting point is a complex scalar field with a $φ^4$ interaction, for which we calculate the 2-particle-irreducible effective action in the Hartree approximation. With this underlying microscopic theory, we can obtain the two-fluid picture of a superfluid, and compute properties such as the superfluid density and the entrainment coefficient for all temperatures below the critical temperature for superfluidity. We compute the critical velocity, taking into account the full self-consistent effect of the temperature and superflow on the quasiparticle dispersion. We also discuss first and second sound modes and how first (second) sound evolves from a density (temperature) wave at low temperatures to a temperature (density) wave at high temperatures. This role reversal is investigated for ultra-relativistic and near-non-relativistic systems for zero and nonzero superflow. For nonzero superflow, we also observe a role reversal as a function of the direction of the sound wave.
description: 32 pages, 9 figures, v2: expanded discussion of renormalization, conclusions unchanged, version to appear in Phys. Rev. D
Kobayashi pseudometric on hyperkahler manifolds
Creators: name: Kamenova, Ljudmila
name: Lu, Steven
name: Verbitsky, Misha
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: The Kobayashi pseudometric on a complex manifold is the maximal pseudometric such that any holomorphic map from the Poincaré disk to the manifold is distance-decreasing. Kobayashi has conjectured that this pseudometric vanishes on Calabi-Yau manifolds. Using ergodicity of complex structures, we prove this conjecture for any hyperkähler manifold that admits a deformation with two Lagrangian fibrations and whose Picard rank is not maximal. The Strominger-Yau-Zaslow (SYZ) conjecture claims that parabolic nef line bundles on hyperkähler manifolds are semi-ample. We prove that the Kobayashi pseudometric vanishes for any hyperkähler manifold with $b_2\geq 13$ if the SYZ conjecture holds for all its deformations. This proves the Kobayashi conjecture for all K3 surfaces and their Hilbert schemes.
description: v3: 19 pages, some proofs updated, a few corrections and references added
Goldstone modes and bifurcations in phase-separated binary condensates at finite temperature
Creators: name: Roy, Arko
name: Gautam, S.
name: Angom, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We show that the third Goldstone mode, which emerges in binary condensates at phase-separation, persists to higher inter-species interaction for density profiles where one component is surrounded on both sides by the other component. This is not the case with symmetry-broken density profiles where one species is to entirely to the left and the other is entirely to the right. We, then, use Hartree-Fock-Bogoliubov theory with Popov approximation to examine the mode evolution at $T\neq0$ and demonstrate the existence of mode bifurcation near the critical temperature. The Kohn mode, however, exhibits deviation from the natural frequency at finite temperatures after the phase separation. This is due to the exclusion of the non-condensate atoms in the dynamics.
Optical properties of the Bi+ center in KAlCl4
Creators: name: Veber, A. A.
name: Romanov, A. N.
name: Usovich, O. V.
name: Fattakhova, Z. T.
name: Haula, E. V.
name: Korchak, V. N.
name: Trusov, L. A.
name: Kazin, P. E.
name: Sulimov, V. B.
name: Tsvetkov, V. B.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Temperature behavior of the Bi+ center emission, excitation bands and luminescence decay law in KAlCl4 crystal are investigated. Abrupt changes of the monocation optical properties are observed at phase transitions of the host. The observed optical transitions are assigned to the specific energy states of Bi+ ion. It is shown that two thermalized levels are responsible for the luminescence. The experimental temperature behavior of the emission and excitation bands are in agreement with theory of electron-phonon interaction of impurity centers in solids; the effective-phonon frequencies and Huang-Rhys parameters are estimated. The configuration coordinate diagram is determined for the Bi+ center in KAlCl4 crystal.
Strategic Content: How Globally Oriented Writing Courses can Bridge Pedagogical and Political Spaces
Creators: name: Shapiro, Shawna
name: Siczek, Megan
Publisher: name: Middlebury
Year: 2022
Subjects: Sociology of education
Higher education
Multicultural, intercultural and cross-cultural studies

description: In recent years, the term internationalization has become increasingly prominent in US higher education. NAFSA defines internationalization as a “conscious effort to integrate and infuse international, intercultural, and global dimensions into the ethos and outcomes of postsecondary education”(Hudzik, 2011). One of the primary goals of internationalization is to facilitate the development of global competency—that is, the knowledge, skills, and perspectives that students need in order to participate effectively in a globally connected world (Brustein, 2007; Knight, 2004). To promote this kind of competency, higher education must not only transmit information but also promote changes to the institutional culture (Olson & Kroeger, 2001, p. 119), so that students have the opportunity to transform their perspectives on the world in meaningful ways. In N. DeJoy & B. Smith (eds.). Cross-Language Communication and the Academy: Re-thinking Orientations. Ann Arbor: University of Michigan Press.
Optical study of lithographically defined, subwavelength plasmonic wires and their coupling to embedded quantum emitters
Creators: name: Bracher, Gregor
name: Schraml, Konrad
name: Ossiander, Marcus
name: Frederick, Simon
name: Finley, Jonathan J.
name: Kaniber, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present an optical investigation of surface plasmon polaritons propagating along nanoscale Au-wires, lithographically defined on GaAs substrates. A two-axis confocal microscope was used to perform spatially and polarization resolved measurements in order to confirm the guiding of surface plasmon polaritons over lengths ranging from $5-20 μm$ along nanowires with a lateral dimension of only $\approx 100 nm$. Finite difference time domain simulations are used to corroborate our experimental observations and highlight the potential to couple proximal quantum dot emitters to propagating plasmon modes in such extreme sub-wavelength devices. Our findings are of strong relevance for the development of semiconductor based integrated plasmonic and active quantum plasmonic nanosystems that merge quantum emitters with nanoscale plasmonic elements.
description: 6 pages, 4 figures
Fe-oxide nanoparticles for magnetic hyperthermia: routes for determining their heating power.
Creators: name: Coïsson, Marco
name: Barrera, Gabriele
name: Celegato, Federica
name: Vinai, Franco
name: Martino, Luca
name: Allia, Paolo
name: Tiberto, Paola
Publisher: name: Zenodo
Year: 2022
Subjects: Magnetic nanoparticles
Biomedical applications
Magnetic hyperthermia
Machine learning

description: Invited presentation at ICFPM 2022 Conference, Yokohama, Japan, 16-21 October 2022, http://web.apollon.nta.co.jp/icfpm2022/
description: Minor bug fixes. Added pictures of Yokohama
An extensive adiabatic invariant for the Klein-Gordon model in the thermodynamic limit
Creators: name: Giorgilli, Antonio
name: Paleari, Simone
name: Penati, Tiziano
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We construct an extensive adiabatic invariant for a Klein-Gordon chain in the thermodynamic limit. In particular, given a fixed and sufficiently small value of the coupling constant $a$, the evolution of the adiabatic invariant is controlled up to times scaling as $β^{1/\sqrt{a}}$ for any large enough value of the inverse temperature $β$. The time scale becomes a stretched exponential if the coupling constant is allowed to vanish jointly with the specific energy. The adiabatic invariance is exhibited by showing that the variance along the dynamics, i.e. calculated with respect to time averages, is much smaller than the corresponding variance over the whole phase space, i.e. calculated with the Gibbs measure, for a set of initial data of large measure. All the perturbative constructions and the subsequent estimates are consistent with the extensive nature of the system.
description: 60 pages. Minor corrections with respect to the first version. To appear in Annales Henri Poincar\'e
Fe-oxide nanoparticles for magnetic hyperthermia: routes for determining their heating power.
Creators: name: Coïsson, Marco
name: Barrera, Gabriele
name: Celegato, Federica
name: Vinai, Franco
name: Martino, Luca
name: Allia, Paolo
name: Tiberto, Paola
Publisher: name: Zenodo
Year: 2022
Subjects: Magnetic nanoparticles
Biomedical applications
Magnetic hyperthermia
Machine learning

description: Invited presentation at ICFPM 2022 Conference, Yokohama, Japan, 16-21 October 2022, http://web.apollon.nta.co.jp/icfpm2022/
Revealing dynamic processes in laser powder bed fusion with in situ X-ray diffraction at PETRA III
Creators: name: Krohmer, Erwin
name: Schmeiser, Felix
name: Wahlmann, Benjamin
name: Rosigkeit, Jan
name: Graf, Gloria
name: Spoerk-Erdely, Petra
name: Clemens, Helmut
name: Staron, Peter
name: Körner, Carolin
name: Reimers, Walter
name: Uhlmann, Eckart
Publisher: name: Technische Universität Berlin
Year: 2022
Subjects: subject: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
subject: synchrotron radiation
subject: alloys
subject: thermal effects
subject: 3D printing
subject: metallurgy
subject: X-ray diffraction
subject: phase transitions
subject: lasers

description: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in: Krohmer, E., Schmeiser, F., Wahlmann, B., Rosigkeit, J., Graf, G., Spoerk-Erdely, P., Clemens, H., Staron, P., Körner, C., Reimers, W., & Uhlmann, E. (2022). Revealing dynamic processes in laser powder bed fusion with in situ X-ray diffraction at PETRA III. In Review of Scientific Instruments (Vol. 93, Issue 6, p. 065104). AIP Publishing. https://doi.org/10.1063/5.0077105 and may be found at https://doi.org/10.1063/5.0077105.
description: The high flux combined with the high energy of the monochromatic synchrotron radiation available at modern synchrotron facilities offers vast possibilities for fundamental research on metal processing technologies. Especially in the case of laser powder bed fusion (LPBF), an additive manufacturing technology for the manufacturing of complex-shaped metallic parts, in situ methods are necessary to understand the highly dynamic thermal, mechanical, and metallurgical processes involved in the creation of the parts. At PETRA III, Deutsches Elektronen-Synchrotron, a customized LPBF system featuring all essential functions of an industrial LPBF system, is used for in situ x-ray diffraction research. Three use cases with different experimental setups and research questions are presented to demonstrate research opportunities. First, the influence of substrate pre-heating and a complex scan pattern on the strain and internal stress progression during the manufacturing of Inconel 625 parts is investigated. Second, a study on the nickel-base superalloy CMSX-4 reveals the formation and dissolution of γ′ precipitates depending on the scan pattern in different part locations. Third, phase transitions during melting and solidification of an intermetallic γ-TiAl based alloy are examined, and the advantages of using thin platelet-shaped specimens to resolve the phase components are discussed. The presented cases give an overview of in situ x-ray diffraction experiments at PETRA III for research on the LPBF technology and provide information on specific experimental procedures.
On the Observability of the Quark Orbital Angular Momentum Distribution
Creators: name: Courtoy, Aurore
name: Goldstein, Gary R.
name: Hernandez, J. Osvaldo Gonzalez
name: Liuti, Simonetta
name: Rajan, Abha
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We argue that due to Parity constraints, the helicity combination of the purely momentum space counterparts of the Wigner distributions -- the generalized transverse momentum distributions -- that describes the configuration of an unpolarized quark in a longitudinally polarized nucleon, can enter the deeply virtual Compton scattering amplitude only through matrix elements involving a final state interaction. The relevant matrix elements in turn involve light cone operators projections in the transverse direction, or they appear in the deeply virtual Compton scattering amplitude at twist three. Orbital angular momentum or the spin structure of the nucleon was a major reason for these various distributions and amplitudes to have been introduced. We show that the twist three contributions associated to orbital angular momentum %to deeply virtual Compton scattering provide observables related to orbital angular momentum and are related to the target-spin asymmetry in deeply virtual Compton scattering, already measured at HERMES.
description: 10 pages, 3 figures; version published in Physics Letters B
An inverse problem for a class of canonical systems and its applications to self-reciprocal polynomials
Creators: name: Suzuki, Masatoshi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Functional Analysis (math.FA)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 30C15, 34A55, 34L40

description: A canonical system is a kind of first-order system of ordinary differential equations on an interval of the real line parametrized by complex numbers. It is known that any solution of a canonical system generates an entire function of the Hermite-Biehler class. In this paper, we deal with the inverse problem to recover a canonical system from a given entire function of the Hermite-Biehler class satisfying appropriate conditions. This type inverse problem was solved by de Branges in 1960s. However his results are often not enough to investigate a Hamiltonian of recovered canonical system. In this paper, we present an explicit way to recover a Hamiltonian from a given exponential polynomial belonging to the Hermite-Biehler class. After that, we apply it to study distributions of roots of self-reciprocal polynomials.
description: 47 pages; an upgraded version of arXiv:1211.2953; the latest version is a revision after publication
Quantum discord determines the interferometric power of quantum states
Creators: name: Girolami, Davide
name: Souza, Alexandre M.
name: Giovannetti, Vittorio
name: Tufarelli, Tommaso
name: Filgueiras, Jefferson G.
name: Sarthour, Roberto S.
name: Soares-Pinto, Diogo O.
name: Oliveira, Ivan S.
name: Adesso, Gerardo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Quantum metrology exploits quantum mechanical laws to improve the precision in estimating technologically relevant parameters such as phase, frequency, or magnetic fields. Probe states are usually tailored on the particular dynamics whose parameters are being estimated. Here we consider a novel framework where quantum estimation is performed in an interferometric configuration, using bipartite probe states prepared when only the spectrum of the generating Hamiltonian is known. We introduce a figure of merit for the scheme, given by the worst case precision over all suitable Hamiltonians, and prove that it amounts exactly to a computable measure of discord-type quantum correlations for the input probe. We complement our theoretical results with a metrology experiment, realized in a highly controllable room-temperature nuclear magnetic resonance setup, which provides a proof-of-concept demonstration for the usefulness of discord in sensing applications. Discordant probes are shown to guarantee a nonzero precision in the estimation procedure for different generating Hamiltonians, while classically correlated probes are unable to accomplish the estimation in a worst case setting. This work establishes a rigorous and direct operational interpretation for general quantum correlations, shedding light on their potential for quantum technology.
description: 6+8 pages, 3+5 figures, 1 table. Close to published version
Covariant action for a string in doubled yet gauged spacetime
Creators: name: Lee, Kanghoon
name: Park, Jeong-Hyuck
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The section condition in double field theory has been shown to imply that a physical point should be one-to-one identified with a gauge orbit in the doubled coordinate space. Here we show the converse is also true, and continue to explore the idea of `spacetime being doubled yet gauged'. Introducing an appropriate gauge connection, we construct a string action, with an arbitrary generalized metric, which is completely covariant with respect to the coordinate gauge symmetry, generalized diffeomorphisms, world-sheet diffeomorphisms, world-sheet Weyl symmetry and O(D,D) T-duality. A topological term previously proposed in the literature naturally arises and a self-duality condition follows from the equations of motion. Further, the action may couple to a T-dual background where the Riemannian metric becomes everywhere singular.
description: 1+29 pages; v2) Refs added. minor changes. To appear in Nuclear Physics B
Quantum theory realises all joint measurability graphs
Creators: name: Heunen, Chris
name: Fritz, Tobias
name: Reyes, Manuel L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Joint measurability of sharp quantum observables is determined pairwise, and so can be captured in a graph. We prove the converse: any graph, whose vertices represent sharp observables, and whose edges represent joint measurability, is realised by quantum theory. This leads us to show that it is not always possible to use Neumark dilation to turn unsharp observables into sharp ones with the same joint measurability relations, highlighting a caveat in the church of the larger Hilbert space".
description: 5 pages
On the congruence $1^m + 2^m + \dotsb + m^m \equiv n \pmod{m}$ with $n | m$
Creators: name: Grau, José María
name: Oller-Marcén, Antonio M.
name: Sondow, Jonathan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B99, 11A99, 11A07

description: We show that if the congruence above holds and $n\mid m$, then the quotient $Q:=m/n$ satisfies $\sum_{p\mid Q} \frac{Q}{p}+1 \equiv 0\pmod{Q}$, where $p$ is prime. The only known solutions of the latter congruence are $Q=1$ and the eight known primary pseudoperfect numbers $2,6,42, 1806, 47058, 2214502422, 52495396602,$ and $8490421583559688410706771261086$. Fixing $Q$, we prove that the set of positive integers $n$ satisfying the congruence in the title, with $m=Q n$, is empty in case $Q=52495396602$, and in the other eight cases has an asymptotic density between bounds in $(0,1)$ that we provide.
description: 13 pages, 1 table; introduced proofs of Lemma 5 and Theorem 5; notational changes ($\mathfrak{M}_Q\to \mathfrak{N}_Q$) and some typos corrected
Anomalous Consistency in Mild Cognitive Impairment: a complex networks approach
Creators: name: Martínez, J. H.
name: Pastor, J. M.
name: Ariza, P.
name: Zanin, M.
name: Papo, D.
name: Maestú, F.
name: Bajo, R.
name: Boccaletti, S.
name: Buldú, J. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Increased variability in performance has been associated with the emergence of several neurological and psychiatric pathologies. However, whether and how consistency of neuronal activity may also be indicative of an underlying pathology is still poorly understood. Here we propose a novel method for evaluating consistency from non-invasive brain recordings. We evaluate the consistency of the cortical activity recorded with magnetoencephalography in a group of subjects diagnosed with Mild Cognitive Impairment (MCI), a condition sometimes prodromal of dementia, during the execution of a memory task. We use metrics coming from nonlinear dynamics to evaluate the consistency of cortical regions. A representation known as (parenclitic networks) is constructed, where atypical features are endowed with a network structure, the topological properties of which can be studied at various scales. Pathological conditions correspond to strongly heterogeneous networks, whereas typical or normative conditions are characterized by sparsely connected networks with homogeneous nodes. The analysis of this kind of networks allows identifying the extent to which consistency is affecting the MCI group and the focal points where MCI is specially severe. To the best of our knowledge, these results represent the first attempt at evaluating the consistency of brain functional activity using complex networks theory.
description: 13 pages, 6 figure, Extended version acepted to Chaos Solitons & Fractals. Elsevier, the interdisciplinary journal of Nonlinear Science, and Nonequilibrium and Complex Phenomena 2014
Coherent Emission in Fast Radio Bursts
Creators: name: Katz, J. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The fast (ms) radio bursts reported by Thornton, {\it et al.} have extremely high brightness temperatures if at the inferred cosmological distances. This implies coherent emission by "bunches" of charges. We model the emission region as a screen of dipole radiators resonant at the frequency of observation and calculate the necessary charge bunching. From this we infer the minimum electron energy required to overcome electrostatic repulsion. The FRB, like the giant pulses of the Crab pulsar, display banded spectra that may be harmonics of plasma frequency emission by plasma turbulence. If FRB are the counterparts of comparatively frequent Galactic events, these may be detected by radio telescopes in their far sidelobes or by small arrays of dipoles.
description: 10 pp., expanded and revised as published, with added discussion of detectability of Galactic counterparts out-of-beam or by dipole antennae
MPEC 2023-L60 : 2023 LU
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 LU

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.
Multifield Inflation after Planck: Isocurvature Modes from Nonminimal Couplings
Creators: name: Schutz, Katelin
name: Sfakianakis, Evangelos I.
name: Kaiser, David I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Recent measurements by the {\it Planck} experiment of the power spectrum of temperature anisotropies in the cosmic microwave background radiation (CMB) reveal a deficit of power in low multipoles compared to the predictions from best-fit $Λ$CDM cosmology. The low-$\ell$ anomaly may be explained by the presence of primordial isocurvature perturbations in addition to the usual adiabatic spectrum, and hence may provide the first robust evidence that early-universe inflation involved more than one scalar field. In this paper we explore the production of isocurvature perturbations in nonminimally coupled two-field inflation. We find that this class of models readily produces enough power in the isocurvature modes to account for the \emph{Planck} low-$\ell$ anomaly, while also providing excellent agreement with the other {\it Planck} results.
description: 19 pages, 15 figures. Minor edits to match published version
MPEC 2023-L61 : 2023 LV
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 LV

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.
The non-Abelian Weyl-Yang-Kaluza-Klein gravity model
Creators: name: Kuyrukcu, Halil
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Weyl$-$Yang gravitational gauge theory is investigated in the structure of a pure higher-dimensional non-Abelian Kaluza$-$Klein background. We construct the dimensionally reduced field equations and stress-energy-momentum tensors as well as the four dimensional modified Weyl$-$Yang$+$Yang$-$Mills theory from an arbitrary curved $internal$ space in the anholonomic frame which are the extensions of our previous model for the non-Abelian case. In particular, the coset space reduction is considered to explicitly obtain the interactions between the gravitational and the gauge fields. The resulting equations not only appear to be generalization of the well-established equations of non-Abelian theory but also contain intrinsically the generalized gravitational source term which does not exist in the literature so far and the Yang$-$Mills force density which is exactly equivalent to the negative gradient of a Yang$-$Mills quadratic invariant.
description: Revised version
Comparative environmental footprints of lettuce supplied by hydroponic controlled-environment agriculture and field-based supply chains
Creators: name: Casey, Leanne
name: Freeman, Ben
name: Francis, Kurt
name: Brychkova, Galina
name: McKeown, Peter
name: Spillane, Charles
name: BEZRUKOV, ANDREY
name: ZAWOROTKO, MICHAEL
name: styles, david
Publisher: name: University of Limerick
Year: 2022
Subjects: Engineering

description: Attributional life cycle assessment was applied to determine environmental footprints of lettuce produced across ten supply chain configurations, based on either hydroponic closed-environment agriculture (CEA) with six different electricity sources, or field supply chains involving regional, continental or inter-continental transport. Hydroponic CEA systems use circa 15 kWh of electricity for lighting, cooling, ventilation and pumping per kg of lettuce supplied. Based on typical current national grid electricity generation mixes with significant fossil fuel dependence, this results in large environmental footprints, e.g. up to 17.8 kg CO2 eq. and 33 g N eq. per kg lettuce – compared with 10 kg CO2 eq. and 16 g N eq. per kg lettuce air-freighted across continents. However, hydro?ponic CEA can produce orders of magnitude more produce per m2 .yr and can be integrated into existing buildings (e.g. on roof tops, in basements and disused warehouses, etc). Factoring in the carbon opportunity costs of land use, and meeting electricity requirements exclusively through renewable generation, could result in closed hy?droponic CEA delivering produce with a smaller carbon footprint than most field-based supply chains, at 0.48 kg CO2 eq. per kg lettuce. However, this would only be the case where renewable electricity originates from genuinely additional capacity, and where a land use policy or other mechanisms ensure that modest areas of land spared from horticultural production are used for “nature based solutions” such as afforestation. Hydroponic CEA uses orders of magnitude less direct water than field-based systems, and could help to mitigate water stress and associated soil degradation in arid and semi-arid regions used for horticulture – so long as upstream water stress associated with electricity generation is mitigated. CEA could be one of the least sustainable forms of food production if poorly implemented, and has numerous environmental hotspots. But with careful design and scaling, in appropriate contexts of high demand and low agro-climatic potential for production of horticultural produce, CEA deployment could play a role in sustainable food system transformation, potentially helping to reconnect consumers with (urban) producers. There may be opportunities to link building air handling systems with rooftop or basement CEA requiring inputs of cooling, CO2 and water.
On the Magnetosphere of an Accelerated Pulsar
Creators: name: Brennan, T. Daniel
name: Gralla, Samuel E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We report on a remarkable class of exact solutions to force-free electrodynamics that has four-current along the light cones of an arbitrary timelike worldline in flat spacetime. No symmetry is assumed, and the solutions are given in terms of a free function of three variables. The field configuration should describe the outer magnetosphere of a pulsar moving on the worldline. The power radiated is the sum of an acceleration (Larmor-type) term and a pulsar-type term.
description: matches published version
Generación Distribuida de Energía en México: Oportunidades para el Bienestar y la Equidad Energética
Creators: name: González-López, Rafael
Publisher: name: Zenodo
Year: 2023

description: En este documento se explora la relación entre la Generación Distribuida de energía y diversos indicadores socioeconómicos en diferentes municipios. A través de varios análisis, el análisis muestra patrones interesantes y oportunidades para mejorar el bienestar y la equidad energética en México.
 
Introducción: El estudio aborda cómo la Generación Distribuida puede contribuir al bienestar al responder a las necesidades energéticas en contextos de climas extremos, variables socioeconómicas y áreas con acceso limitado a la electricidad.
 
Capacidad instalada vs. consumo eléctrico en hogares: Se observa que la capacidad de Generación Distribuida no siempre coincide con altos consumos eléctricos debidos al aire acondicionado. La expansión de esta generación en zonas con demanda de climatización puede aliviar la red eléctrica y promover fuentes limpias.
 
Capacidad instalada vs. porcentaje de ocupantes sin energía eléctrica: Existe una relación directa entre la falta de acceso a la electricidad y la capacidad limitada de Generación Distribuida. Ampliar esta capacidad en áreas con acceso limitado no solo puede mitigar la falta de electricidad, sino también empoderar a las comunidades para generar su propia energía.
 
Capacidad instalada vs. consumo eléctrico para riego agrícola: Municipios con acceso limitado a la electricidad también tienen menos capacidad de Generación Distribuida. Esta situación afecta el desarrollo y calidad de vida. La Generación Distribuida, mediante tecnologías adecuadas y políticas de apoyo, podría impulsar el desarrollo económico y mejorar la vida de estas comunidades.
 
Capacidad instalada vs. tarifa de alto consumo: La relación entre la capacidad de Generación Distribuida y las tarifas de alto consumo sugiere el uso de generación distribuida para reducir los costos.
 
Capacidad instalada vs. población con bajos ingresos: Similar a los puntos anteriores, las áreas con baja capacidad de Generación Distribuida tienden a tener poblaciones con bajos ingresos. Esto sugiere la importancia de expandir la generación descentralizada para mejorar la calidad de vida en estas comunidades.
 
En resumen, el análisis muestra cómo la Generación Distribuida puede ser una herramienta valiosa para mejorar el bienestar y abordar la inequidad energética en México. Al expandir esta capacidad en áreas con alta demanda de climatización, en zonas con acceso limitado a la electricidad y en sectores como la agricultura, se puede lograr un futuro energético más sostenible, equitativo y resiliente.
DynamoRep: Trajectory-Based Population Dynamics for Classification of Black-box Optimization Problems
Creators: name: Cenikj, Gjorgjina
name: Petelin, Gašper
name: Doerr, Carola
name: Korošec, Peter
name: Eftimov, Tome
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: The application of machine learning (ML) models to the analysis of optimization algorithms requires the representation of optimization problems using numerical features. These features can be used as input for ML models that are trained to select or to configure a suitable algorithm for the problem at hand. Since in pure black-box optimization information about the problem instance can only be obtained through function evaluation, a common approach is to dedicate some function evaluations for feature extraction, e.g., using random sampling. This approach has two key downsides: (1) It reduces the budget left for the actual optimization phase, and (2) it neglects valuable information that could be obtained from a problem-solver interaction. In this paper, we propose a feature extraction method that describes the trajectories of optimization algorithms using simple descriptive statistics. We evaluate the generated features for the task of classifying problem classes from the Black Box Optimization Benchmarking (BBOB) suite. We demonstrate that the proposed DynamoRep features capture enough information to identify the problem class on which the optimization algorithm is running, achieving a mean classification accuracy of 95% across all experiments.
description: 9 pages, 5 figures
Cavity optomechanics in gallium phosphide microdisks
Creators: name: Mitchell, Matthew
name: Hryciw, Aaron C.
name: Barclay, Paul E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate gallium phosphide (GaP) microdisk optical cavities with intrinsic quality factors $ > 2.8\times10^{5}$ and mode volumes $< 10 (λ/n)^3$, and study their nonlinear and optomechanical properties. For optical intensities up to $8.0\times10^4$ intracavity photons, we observe optical loss in the microcavity to decrease with increasing intensity, indicating that saturable absorption sites are present in the GaP material, and that two-photon absorption is not significant. We observe optomechanical coupling between optical modes of the microdisk around 1.5 $μ$m and several mechanical resonances, and measure an optical spring effect consistent with a theoretically predicted optomechanical coupling rate $g_0/2π\sim 30$ kHz for the fundamental mechanical radial breathing mode at 488 MHz.
description: Published Version
Epidemics in partially overlapped multiplex networks
Creators: name: Buono, C.
name: Zuzek, L. G. Alvarez
name: Macri, P. A.
name: Braunstein, L. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Populations and Evolution (q-bio.PE)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Many real networks exhibit a layered structure in which links in each layer reflect the function of nodes on different environments. These multiple types of links are usually represented by a multiplex network in which each layer has a different topology. In real-world networks, however, not all nodes are present on every layer. To generate a more realistic scenario, we use a generalized multiplex network and assume that only a fraction $q$ of the nodes are shared by the layers. We develop a theoretical framework for a branching process to describe the spread of an epidemic on these partially overlapped multiplex networks. This allows us to obtain the fraction of infected individuals as a function of the effective probability that the disease will be transmitted $T$. We also theoretically determine the dependence of the epidemic threshold on the fraction $q > 0$ of shared nodes in a system composed of two layers. We find that in the limit of $q \to 0$ the threshold is dominated by the layer with the smaller isolated threshold. Although a system of two completely isolated networks is nearly indistinguishable from a system of two networks that share just a few nodes, we find that the presence of these few shared nodes causes the epidemic threshold of the isolated network with the lower propagating capacity to change discontinuously and to acquire the threshold of the other network.
description: 13 pages, 4 figures
Impact of climate change on horticultural species, with special emphasis on West Africa
Creators: name: Amuji, Chinedu Felix
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: Food security is a major issue in West Africa (WA), and currently horticultural crops are grown mostly under rain-fed conditions. However, as the climate changes, increases in temperature and shifts in precipitation will have major ramifications for which crops can be grown in the region. The overarching aim of this thesis is to assess the likely effects of climate change on production of horticultural crops of major importance in WA, thereby helping policy-makers to identify key threats that climate change presents to food security and formulate management options to reduce risks. My thesis consists of three experimental data chapters as well as a review. First, I present a review chapter titled “What is the future of rain-fed horticultural production in a changing West African climate?”. I synthesise knowledge of the responses of key types of horticultural crops – vegetables, plantations, roots and tubers, and fruit – to climate change, and discuss options for adaptation. Two of the data chapters’ detail glasshouse experiments investigating the effects of heat and moisture stress on tomatoes, an important horticultural crop in WA. I hypothesize that (1) heatwaves will have a negative influence on the eco-physiological responses of the crops, causing a reduction in yield, (2) the effect of moisture stress combined ‘sequentially’ or ‘additively’ with heatwaves will be more severe than either of these impacts alone, and will cause a significant reduction in yield and biomass accumulation, and (3) that seasonally adapted varieties of tomato will respond differently to the stresses, with the varieties adapted for warmer regions having higher yield than varieties from cooler regions. The results demonstrate that the three tomatoes varieties experienced significant declines in yield as a consequence of the stresses, with plants unable to recover fully when both stresses co-occur. The third data chapter utilised a common habitat suitability model, Maxent, to project likely changes in suitable conditions for six economically important rain-fed horticultural crops under current and future climate conditions. From the models, I identified likely changes in areas suitability. The results show that suitable habitat for cashew is likely to be relatively stable for the future whereas the total area suitable for okra, sweet potato, and taro may decline by 2050’s to 2070’s. As such, my thesis provides guidance for the future of horticultural crops growing under rain-fed conditions in WA.
Generación Distribuida de Energía en México: Oportunidades para el Bienestar y la Equidad Energética
Creators: name: González-López, Rafael
Publisher: name: Zenodo
Year: 2023

description: En este documento se explora la relación entre la Generación Distribuida de energía y diversos indicadores socioeconómicos en diferentes municipios. A través de varios análisis, el análisis muestra patrones interesantes y oportunidades para mejorar el bienestar y la equidad energética en México.
 
Introducción: El estudio aborda cómo la Generación Distribuida puede contribuir al bienestar al responder a las necesidades energéticas en contextos de climas extremos y áreas con acceso limitado a la electricidad.
 
Capacidad instalada vs. consumo eléctrico en hogares: Se observa que la capacidad de Generación Distribuida no siempre coincide con altos consumos eléctricos debidos al aire acondicionado. La expansión de esta generación en zonas con demanda de climatización puede aliviar la red eléctrica y promover fuentes limpias.
 
Capacidad instalada vs. porcentaje de ocupantes sin energía eléctrica: Existe una relación directa entre la falta de acceso a la electricidad y la capacidad limitada de Generación Distribuida. Ampliar esta capacidad en áreas con acceso limitado no solo puede mitigar la falta de electricidad, sino también empoderar a las comunidades para generar su propia energía.
 
Capacidad instalada vs. consumo eléctrico para riego agrícola: Municipios con acceso limitado a la electricidad también tienen menos capacidad de Generación Distribuida. Esta situación afecta el desarrollo y calidad de vida. La Generación Distribuida, mediante tecnologías adecuadas y políticas de apoyo, podría impulsar el desarrollo económico y mejorar la vida de estas comunidades.
 
Capacidad instalada vs. tarifa de alto consumo: La relación entre la capacidad de Generación Distribuida y las tarifas de alto consumo no es evidente en las figuras proporcionadas.
 
Capacidad instalada vs. población con bajos ingresos: Similar a los puntos anteriores, las áreas con baja capacidad de Generación Distribuida tienden a tener poblaciones con bajos ingresos. Esto sugiere la importancia de expandir la generación descentralizada para mejorar la calidad de vida en estas comunidades.
 
En resumen, el análisis muestra cómo la Generación Distribuida puede ser una herramienta valiosa para mejorar el bienestar y abordar la inequidad energética en México. Al expandir esta capacidad en áreas con alta demanda de climatización, en zonas con acceso limitado a la electricidad y en sectores como la agricultura, se puede lograr un futuro energético más sostenible, equitativo y resiliente.
Homogeneous Ricci Solitons are Algebraic
Creators: name: Jablonski, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C25, 53C30, 53C44, 22E25

description: In this short note, we show that homogeneous Ricci solitons are algebraic. As an application, we see that the generalized Alekseevskii conjecture is equivalent to the Alekseevskii conjecture.
description: 7 pages. minor changes from v1, final version to appear in Geometry & Topology
MPEC 2023-L62 : 2023 LW
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 LW

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.
The Berry phase and the phase of the determinant
Creators: name: Braverman, Maxim
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In 1984 Michael Berry discovered that an isolated eigenstate of an adiabatically changing periodic Hamiltonian $H(t)$ acquires a phase, called the Berry phase. We show that under very general assumptions the adiabatic approximation of the phase of the zeta-regularized determinant of the imaginary-time Schrodinger operator with periodic Hamiltonian is equal to the Berry phase.
description: several references and comments are added. some misprints are corrected
Reflection Channel Model for Terahertz Communications
Creators: name: Le, Thanh
name: Tran, Ha
name: Singh, Suresh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Terahertz frequencies are an untapped resource for providing high-speed short-range communications. As a result, it is of interest to study the propagation characteristics of terahertz waves and to develop channel models. In previous work we used a measurement-based approach to develop an accurate channel model for line of sight (LoS) links. In this paper we extend that work by developing channel models for non-line of sight (NLoS) links where the signal suffers one reflection. We study reflections that occur off a metal plate as well as a piece of wood. Our model for received magnitude includes the effects of standing waves that develop between the transmitter and receiver. Measurements show an excellent agreement between empirical data and the model. In addition, we have analyzed the received phase of the reflected signal at frequencies in the range 320- 480 GHz. We observed a linear error between the predicted and actual phase and developed a model to accommodate that discrepancy. The final model we have developed for predicting received phase is very accurate for the entire range 320 - 480 GHz and for both materials.