cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Inverse Compton Cooling in the Coronae of Simulated Black Hole Accretion Flows
Creators: name: Kinch, Brooks E.
name: Noble, Scott C.
name: Schnittman, Jeremy D.
name: Krolik, Julian H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a formulation for a local cooling function to be employed in the diffuse, hot corona region of 3D GRMHD simulations of accreting black holes. This new cooling function calculates the cooling rate due to inverse Compton scattering by considering the relevant microphysics in each cell in the corona and approximating the radiation energy density and Compton temperature there by integrating over the thermal seed photon flux from the disk surface. The method either assumes ion and electron temperatures are equal (1T), or calculates them separately (2T) using an instantaneous equilibrium approach predicated on the actual relevant rate equations (Coulomb and Compton). The method is shown to be consistent with a more detailed ray-tracing calculation where the bulk of the cooling occurs, but is substantially less costly to perform. As an example, we apply these methods to a \textsc{harm3d} simulation of a $10 M_\odot$, non-spinning black hole, accreting at nominally 1\% the Eddington value. Both 1T and 2T approaches lead to increased radiative efficiency and a larger fraction of total cooling in the corona as compared to the original target-temperature cooling function used by \textsc{harm3d}, especially in the 1T case. Time-averaged post-processing reveals that the continuum spectral observations predicted from these simulations are qualitatively similar to actual X-ray binary data, especially so for the 1T approach which yields a harder power-law component ($Γ= 2.25$) compared to the 2T version ($Γ= 2.53$)
description: 33 pages, 25 figures, submitted to ApJ
Existence criterion for Hall subgroups of finite groups
Creators: name: Revin, Danila O.
name: Vdovin, Evgenii P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20D10

description: In the paper we obtain an existence criterion for Hall subgroups of finite groups in terms of a composition series.
description: We made some editor corrections in the text
Mobility of dislocations in zirconium
Creators: name: Soyez, Thomas
name: Caillard, Daniel
name: Onimus, Fabien
name: Clouet, Emmanuel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Plasticity in hexagonal close-packed zirconium is mainly controlled by the glide of dislocations with 1/3<1-210> Burgers vectors. As these dislocations cannot accommodate deformation in the [0001] direction , twinning or glide of dislocations, i.e. dislocations with 1/3<1-213> Burgers vector, have to be activated. We have performed in situ straining experiments in a transmission electron microscope to study the glide of dislocations in two different zirconium samples, pure zirconium and Zircaloy-4, at room temperature. These experiments show that dislocations exclusively glide in first-order pyramidal planes with cross-slip being activated. A much stronger lattice friction is opposing the glide of dislocations when their orientation corresponds to the direction defined by the intersection of their glide plane with the basal plane. This results in long dislocations straightened along which glide either viscously or jerkily. This direction governs the motion of segments with other orientations, whose shape is merely driven by the minimization of the line tension. The friction due to solute atoms is also discussed.
Battered women and child custody : The ongoing exposure to abusive ex-partners : A qualitative study
Creators: name: Shalansky, Catriona Elizabeth
Publisher: name: University of British Columbia
Year: 2009

description: Wife abuse has become an epidemic in Canada. Research studies have documented that abuse does not end when a women is divorced or separated from her abuser, but, in fact, the danger increases. A father's legal right to custody of and access to his children and the children's bond with their father prevent a women from truly breaking free of her abuser. Theoretical literature has addressed how custody and access can serve as a means for a batterer to continue his abuse and expose his children to ongoing abuse and discord. Research on how custody and access issues are affecting battered women is limited. Key details about this phenomenon are not known. Hence, a research study using the qualitative methodology of phenomenology was conducted of battered women's experiences with custody and access and the ongoing exposure to abusive ex-partners. Six single mothers who had left abusive relationships and were at the time sharing custody of and/or access to their children with their abusive ex-partners participated in the study. Unstructured, non-directive interviews were conducted. Direction for analysis was taken from the specific steps outlined by Giorgi (1975). Data analysis revealed that al l of the women were living in great fear for their safety and that of their children. The ongoing danger and stress of living with the restrictions of the law and legal system took it's toll on the women and ultimately affected their physical health and psychological well-being. The women described their experiences as having four components: 1) SAFETY: Living with Ongoing Danger; 2) STRESS: Living with the Restrictions of the Law and the Legal System; 3) COPING: Social Support Systems; and 4) TO HEAL AND MOVE FORWARD IN LIFE. Themes within these components were identified, and implications for nursing practice, education and research were discussed.
Detection of the Orbital Hall Effect by the Orbital-Spin Conversion
Creators: name: Xiao, Jiewen
name: Liu, Yizhou
name: Yan, Binghai
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The intrinsic orbital Hall effect (OHE), the orbital counterpart of the spin Hall effect, was predicted and studied theoretically for more than one decade, yet to be observed in experiments. Here we propose a strategy to convert the orbital current in OHE to the spin current via the spin-orbit coupling from the contact. Furthermore, we find that OHE can induce large nonreciprocal magnetoresistance when employing magnetic contact. Both the generated spin current and the orbital Hall magnetoresistance can be applied to probe the OHE in experiments and design orbitronic devices.
description: Supplementary Materials attached
The Cosmic Baryon and Metal Cycles
Creators: name: Peroux, Celine
name: Howk, J. Christopher
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Characterizing the relationship between stars, gas, and metals in galaxies is a critical component of understanding the cosmic baryon cycle. We compile contemporary censuses of the baryons in collapsed structures, their chemical make-up and dust content. We show that: The H I mass density of the Universe is well determined to redshifts z ~ 5 and shows minor evolution with time. New observations of molecular hydrogen reveal its evolution mirrors that of the global star formation rate density. The constant cosmic molecular gas depletion timescale points to a universal relationship between gas reservoirs and star formation. The metal mass density in cold gas ($T < 10^4$ K) contains virtually all the metals produced by stars for z > 2.5. At lower redshifts, the contributors to the total amount of metals are more diverse; at z < 1, most of the observed metals are bound in stars. Overall there is little evidence for a "missing metals problem" in modern censuses. We characterize the dust content of neutral gas over cosmic time, finding the dust-to-gas and dust-to-metals ratios fall with decreasing metallicity. We calculate the cosmological dust mass density in the neutral gas up to z ~ 5. There is good agreement between multiple tracers of the dust content of the Universe.
description: 47 pages. Authors' draft version of an invited review published in Annual Reviews of Astronomy & Astrophysics; see https://www.annualreviews.org/doi/10.1146/annurev-astro-021820-120014 for the well-edited version
Deformation of dual Leibniz algebra morphisms
Creators: name: Yau, Donald
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 13D10; 17A32

description: An algebraic deformation theory of morphisms of dual Leibniz algebras is obtained.
description: 10 pages. To appear in Communications in Algebra
Observational analysis of late-time acceleration in $f(Q, L_m)$ gravity
Creators: name: Myrzakulov, Kairat
name: Koussour, M.
name: Donmez, O.
name: Cilli, A.
name: Güdekli, E.
name: Rayimbaev, J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In this study, we explored late-time cosmology within an extended class of theories based on $f(Q, L_m)$ gravity. This theory generalizes $f(Q)$ gravity by incorporating a non-minimal coupling between the non-metricity $Q$ and the matter Lagrangian $L_m$, analogous to the $f(Q,T)$ theory. The coupling between $Q$ and $L_m$ leads to the non-conservation of the matter energy-momentum tensor. We first investigated a cosmological model defined by the functional form $f(Q, L_m) = αQ + βL_m^n$, where $α$, $β$, and $n$ are constants. The derived Hubble parameter $H(z) = H_0 (1+z)^{\frac{3n}{2(2n-1)}}$ indicates that $n$ significantly influences the scaling of $H(z)$ over cosmic history, with $n > 2$ suggesting accelerated expansion. We also examined the simplified case of $n = 1$, leading to the linear form $f(Q, L_m) = αQ + βL_m$, consistent with a universe dominated by non-relativistic matter. Using various observational datasets, including $H(z)$ and Pantheon, we constrained the model parameters. Our analysis showed that the $f(Q, L_m)$ model aligns well with observational results and exhibits similar behavior to the $Λ$CDM model. The results, with $q_0 = -0.22 \pm 0.01$ across all datasets, indicate an accelerating universe, highlighting the model's potential as an alternative to $Λ$CDM.
description: Journal of High Energy Astrophysics accepted version
Neutrino telescopes and high-energy cosmic neutrinos
Creators: name: Palladino, Andrea
name: Spurio, Maurizio
name: Vissani, Francesco
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this review paper, we present the main aspects of high-energy cosmic neutrino astrophysics. We begin by describing the generic expectations for cosmic neutrinos, including the effects of propagation from their sources to the detectors. Then we introduce the operating principles of current neutrino telescopes, and examine the main features (topologies) of the observable events. After a discussion of the main background processes, due to the concomitant presence of secondary particles produced in the terrestrial atmosphere by cosmic rays, we summarize the current status of the observations with astrophysical relevance that have been greatly contributed by IceCube detector. Then, we examine various interpretations of these findings, trying to assess the best candidate sources of cosmic neutrinos. We conclude with a brief perspective on how the field could evolve within a few years.
description: 13 figures
A Model for the Coupled Eruption of a Pseudostreamer and Helmet Streamer
Creators: name: Wyper, P. F.
name: Antiochos, S. K.
name: DeVore, C. R.
name: Lynch, B. J.
name: Karpen, J. T.
name: Kumar, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A highly important aspect of solar activity is the coupling between eruptions and the surrounding coronal magnetic-field topology, which determines the trajectory and morphology of the event and can even lead to sympathetic eruptions from multiple sources. In this paper, we report on a numerical simulation of a new type of coupled eruption, in which a coronal jet initiated by a large pseudostreamer filament eruption triggers a streamer-blowout coronal mass ejection (CME) from the neighboring helmet streamer. Our configuration has a large opposite-polarity region positioned between the polar coronal hole and a small equatorial coronal hole, forming a pseudostreamer flanked by the coronal holes and the helmet streamer. Further out, the pseudostreamer stalk takes the shape of an extended arc in the heliosphere. We energize the system by applying photospheric shear along a section of the polarity inversion line within the pseudostreamer. The resulting sheared-arcade filament channel develops a flux rope that eventually erupts as a classic coronal-hole-type jet. However, the enhanced breakout reconnection above the channel as the jet is launched progresses into the neighboring helmet streamer, partially launching the jet along closed helmet streamer field lines and blowing out the streamer top to produce a classic bubble-like CME. This CME is strongly deflected from the jet's initial trajectory and contains a mixture of open and closed magnetic field lines. We present the detailed dynamics of this new type of coupled eruption, its underlying mechanisms and the implications of this work for the interpretation of in-situ and remote-sensing observations.
description: ApJ, in press, 21 pages, 14 figures
$B_s - \bar B_s$ Mixing and Its Implication for $b \to s$ Transitions in Supersymmetry
Creators: name: Arnowitt, Richard
name: Dutta, Bhaskar
name: Hu, Bo
name: Oh, Sechul
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the effect of the current measurement of the neutral $B_s$ meson mass difference, $ΔM_{B_s}$, on SUGRA models which have non-zero values of the soft breaking terms $(m^2_{LL,RR})_{23}$ and $A^{u,d}_{23}$ at the GUT scale. We use non-zero values of these parameter to explain the $B\to Kπ$ puzzle and find that even after satisfying the experimental result on $ΔM_{B_s}$ and the branching ratio (BR) of $b\to sγ$ we still can explain the puzzle. Further we show that in this parameter space it is possible to accommodate the large BR of $B\to η' K$ and the current experimental data for CP asymmetries of $B\to η' K^0$ and $B\to ϕK^0$. The predicted value of $\sin (2β^{\rm eff})_{η' K^0}$ is about $0.52-0.67$.
description: 13 pages, 5 figures
Combined fit to the cross sections of $e^+e^- \rightarrow πZ_c(3900) \rightarrow ππJ/ψ$ and $e^+e^- \rightarrow πZ_c(3900) \rightarrow πD\bar{D}^{*}$
Creators: name: Zhang, Jielei
name: Zhu, Tengjiao
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The cross sections of $e^+e^- \rightarrow πZ_c(3900) \rightarrow ππJ/ψ$ and $e^+e^- \rightarrow πZ_c(3900) \rightarrow πD\bar{D}^{*}$ have been measured by BESIII experiment. We try to perform a combined fit to the cross sections with one Breit-Wigner function, the fit results show the structure's mass and width are $M=(4232\pm5)$ MeV/$c^2$, $Γ=(65\pm21)$ MeV. The ratio $\frac{\mathcal{B}(Z_c(3900)\rightarrow D\bar{D}^{*})}{\mathcal{B}(Z_c(3900)\rightarrowπJ/ψ)}$ is determined to be $(16\pm6)$. We also try to fit the cross sections with two Breit-Wigner functions, while we can't come to any definitive conclusions about the second structure. More measurements are desired to improve the understanding of $e^+e^- \rightarrow πZ_c(3900)$ line shape.
Closed Bosonic String Field Theory at Quintic Order: Five-Tachyon Contact Term and Dilaton Theorem
Creators: name: Moeller, Nicolas
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We solve the geometry of the closed string field theory five-point vertex. Our solution is calculated in terms of quadratic Strebel differentials which are found numerically all over the relevant subspace of the moduli space of spheres with five punctures. Part of the boundary of the reduced moduli space is described in terms of an algebraic curve, while the remaining part has to be evaluated numerically. We use this data to compute the contact term of five tachyons and estimate its uncertainty to be of about 0.1%. To put to a test the theory and the computations done, we calculate the contact term of five dilatons. In agreement with the dilaton theorem, it is found to cancel the term obtained from the tree level Feynman diagrams built with three- and four-vertices. This cancellation, achieved with a precision of about 0.1%, is within the estimated margin error on the contact term and is therefore a very good evidence that our computations are reliable. The techniques and numerical algorithm developed in this paper make it possible to compute the contact amplitude of any five off-shell closed bosonic string states.
description: 45 pages, 11 figures. v2: Typos corrected, references added
Exact solution of the zero-range process: fundamental diagram of the corresponding exclusion process
Creators: name: Kanai, Masahiro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In this paper, we propose a general way of computing expectation values in the zero-range process, using an exact form of the partition function. As an example, we provide the fundamental diagram (the flux-density plot) of the asymmetric exclusion process corresponding to the zero-range process.We express the partition function for the steady state by the Lauricella hypergeometric function, and thereby have two exact fundamental diagrams each for the parallel and random sequential update rules. Meanwhile, from the viewpoint of equilibrium statistical mechanics, we work within the canonical ensemble but the result obtained is certainly in agreement with previous works done in the grand canonical ensemble.
description: 12 pages, 2 figures
Inhomogeneous time-reversal symmetry breaking in $\mathrm{Sr}_{2}\mathrm{Ru}\mathrm{O}_{4}$
Creators: name: Willa, Roland
name: Hecker, Matthias
name: Fernandes, Rafael M.
name: Schmalian, Jörg
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We show that the observed time-reversal symmetry breaking (TRSB) of the superconducting state in $\mathrm{Sr}_{2}\mathrm{Ru}\mathrm{O}_{4}$ can be understood as originating from inhomogeneous strain fields near edge dislocations of the crystal. Specifically, we argue that, without strain inhomogeneities, $\mathrm{Sr}_{2}\mathrm{Ru}\mathrm{O}_{4}$ is a single-component, time-reversal symmetric superconductor, likely with $d_{x^{2}-y^{2}}$ symmetry. However, due to the strong strain inhomogeneities generated by dislocations, a slowly-decaying sub-leading pairing state contributes to the condensate in significant portions of the sample. As it phase winds around the dislocation, time-reversal symmetry is locally broken. Global phase locking and TRSB occur at a sharp Ising transition that is not accompanied by a change of the single-particle gap and yields a very small heat capacity anomaly. Our model thus explains the puzzling absence of a measurable heat capacity anomaly at the TRSB transition in strained samples, and the dilute nature of the time-reversal symmetry broken state probed by muon spin rotation experiments. We propose that plastic deformations of the material may be used to manipulate the onset of broken time-reversal symmetry.
description: 12 pages, 6 figures
Entanglement generation and protection by detuning modulation
Creators: name: Paternostro, M.
name: Tame, M. S.
name: Palma, G. M.
name: Kim, M. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a protocol for steady-state entanglement generation and protection based on detuning modulation in the dissipative interaction between a two-qubit system and a bosonic mode. The protocol is a global-addressing scheme which only requires control over the system as a whole. We describe a postselection procedure to project the register state onto a subspace of maximally entangled states. We also outline how our proposal can be implemented in a circuit-quantum electrodynamics setup.
description: 9 pages, 8 figures, RevTeX4
STV for BC (single transferable vote for British Columbia)
Creators: name: Loenen, Nick
Publisher: name: University of British Columbia
Year: 2009

description: In a representative democracy the people's representatives are expected to do what the people would do if they were present in person. To attain this ideal requires that the legislature in its composition embodies the politically relevant diversity that exists within society, and that the legislature has power to act. These two requirements are prevalent among significant theories of representation, post- Charter court rulings, and the commonly accepted expectations of the people themselves. Typically, the composition of the BC legislature is not representative; and the legislature lacks power to act. The Single Member Plurality electoral system manufactures majorities in the legislature where none exist among the people. Most voters are not represented in the legislature, and the artificial majorities give cabinet undue power. When cabinet has too much power, the concept of responsible government is subverted, MLAs lose their independence, and are beholden to their political party, instead of their constituents. Replacing the Single Member Plurality system with the Single Transferable Vote has the potential to give voters more choice, waste fewer votes, bring greater diversity into the legislature, lessen party discipline, weaken the power of the Premier and cabinet, increase the power of the legislature, restore responsible government, render government more responsive to changing public demands, reconnect government to the people, and give voters power over their representatives. Our electoral system is designed to benefit political parties - not people. Therefore, change will not likely originate with parties and party activists. It must come from the people themselves, aided perhaps by the courts.
On the Existence of the Logarithmic Correction Term in Black Hole Entropy-Area Relation
Creators: name: Nozari, Kourosh
name: Sefiedgar, A. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this paper we consider a model universe with large extra dimensions to obtain a modified black hole entropy-area relation. We use the generalized uncertainty principle to find a relation between the number of spacetime dimensions and the presence or vanishing of logarithmic prefactor in the black hole entropy-area relation. Our calculations are restricted to the microcanonical ensembles and we show that in the modified entropy-area relation, the microcanonical logarithmic prefactor appears only when spacetime has an even number of dimensions.
description: 9 Pages, No Figures
Assessing clinical competencies using the Objective Structured Clinical Examination (OSCE) in psychology training
Creators: name: Yap, Keong
name: Sheen, Jade
name: Nedeljkovic, Maja
name: Milne, Lisa
name: Lawrence, Katherine
name: Hay, Margaret
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Biochemistry
subject: Space Science
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Science Policy
subject: Hematology

description: Accurate and reliable assessment of clinical competencies in clinical psychology training requires the use of a range of assessment methods. In addition to traditional written assignments, exams, and clinical supervisor ratings, there is a growing recognition that objective and structured performance-based exams are also required. The objective structured clinical examination (OSCE) is a well-established assessment method that involves a series of assessment stations in which students perform structured clinical tasks, mostly with simulated patients (SPs), while being independently rated by examiners. Several clinical psychology programmes in Australia have started conducting OSCE but descriptions of clinical psychology OSCE are lacking. In this paper, we describe the OSCE in four universities. Challenges, limitations, and practical issues of this form of assessment, in addition to similarities and differences between OSCE are explored. To promote best practice in the assessment of clinical competencies, we offer seven tips to clinical psychology trainers on setting up an OSCE for their programme. The OSCE has the potential to improve the reliability, validity and authenticity of competency assessments in clinical psychology programmes. We hope these OSCE descriptions and tips will encourage programmes to introduce the OSCE and spur further research into this form of assessment.
Mass Splitting of Staggered Fermion and $SO(2D)$ Clifford Algebra
Creators: name: Hatakeyama, M.
name: Sawanaka, H.
name: So, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present a new method to introduce rotationally invariant terms in staggered fermions which is based on an $SO(2D)$ Clifford algebra formulation, where $D$ means the number of space-time dimensions. We have four candidates for improved mass terms that can split the degenerate mass of staggered fermions. Among them, we analyze three types of combinations and find only one case that can identify with the light single Dirac mode.
description: 7pages, talk presented at Lattice 2006 (Theoretical Developments)
Constructing AdS_2 flow geometries
Creators: name: Anninos, Dionysios
name: Galante, Damián A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider two-dimensional geometries flowing away from an asymptotically AdS$_2$ spacetime. Macroscopically, flow geometries and their thermodynamic properties are studied from the perspective of dilaton-gravity models. We present a precise map constructing the fixed background metric from the boundary two-point function of a nearly massless matter field. We analyse constraints on flow geometries, viewed as solutions of dimensionally reduced theories, stemming from energy conditions. Microscopically, we construct computationally tractable RG flows in SYK-type models at vanishing and non-vanishing temperature. For certain regimes of parameter space, the flow geometry holographically encoding the microscopic RG flow is argued to interpolate between two (near) AdS$_2$ spacetimes. The coupling between matter fields and the dilaton in the putative bulk is also discussed. We speculate on microscopic flows interpolating between an asymptotically AdS$_2$ spacetime and a portion of a dS$_2$ world.
description: 46 pages
Galactic Cosmic Rays - Clouds Effect and Bifurcation Model of the Earth Global Climate. Part 2. Comparison of Theory with Experiment
Creators: name: Rusov, Vitaliy D.
name: Vaschenko, Vladimir N.
name: Linnika, Elena P.
name: Myhalus, ?ksana T.
name: Bondartchuk, Yuriy A.
name: Smolyar, Vladimir P.
name: Kosenko, Sergey I.
name: Mavrodiev, Strachimir Cht.
name: Vachev, Boyko I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The solution of energy-balance model of the Earth global climate and the EPICA Dome C and Vostok experimental data of the Earth surface palaeotemperature evolution over past 420 and 740 kyr are compared. In the framework of proposed bifurcation model (i) the possible sharp warmings of the Dansgaard-Oeschger type during the last glacial period due to stochastic resonance is theoretically argued; (ii) the concept of climatic sensitivity of water in the atmosphere, whose temperature instability has the form of so-called hysteresis loop, is proposed, and based of this concept the time series of global ice volume over the past 1000 kyr, which is in good agreement with the time series of delta O-18 concentration in the sea sediments, is obtained; (iii) the so-called "CO2 doubling" problem is discussed
description: 19 pages, 4 figures
Ferromagnetic and spin-glass like transition in the $q$-neighbor Ising model on random graphs
Creators: name: Krawiecki, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The $q$-neighbor Ising model is investigated on homogeneous random graphs with a fraction of edges associated randomly with antiferromagnetic exchange integrals and the remaining edges with ferromagnetic ones. It is a nonequilibrium model for the opinion formation in which the agents, represented by two-state spins, change their opinions according to a Metropolis-like algorithm taking into account interactions with only a randomly chosen subset of their $q$ neighbors. Depending on the model parameters in Monte Carlo simulations phase diagrams are observed with first-order ferromagmetic transition, both first- and second-order ferromagnetic transitions and second-order ferromagnetic and spin-glass-like transitions as the temperature and fraction of antiferromagnetic exchange integrals are varied; in the latter case the obtained phase diagrams qualitatively resemble those for the dilute spin-glass model. Homogeneous mean-field and pair approximations are extented to take into account the effect of the antiferromagnetic exchange interactions on the ferromagnetic phase transition in the model. For a broad range of parameters critical temperatures for the first- or second-order ferromagnetic transition predicted by the homogeneous pair approximation show quantitative agreement with those obtained from Monte Carlo simulations; significant differences occur mainly in the vicinity of the tricritical point in which the critical lines for the second-order ferromagnetic and spin-glass-like transitions meet.
description: submitted to Eur Phys J B
Single-Species Three-Particle Reactions in One Dimension
Creators: name: Vollmayr-Lee, Benjamin P.
name: Gildner, Melinda M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Renormalization group calculations for fluctuation-dominated reaction-diffusion systems are generally in agreement with simulations and exact solutions. However, simulations of the single-species reactions 3A->(0,A,2A) at their upper critical dimension d_c=1 have found asymptotic densities argued to be inconsistent with renormalization group predictions. We show that this discrepancy is resolved by inclusion of the leading corrections to scaling, which we derive explicitly and show to be universal, a property not shared by the A+A->(0,A) reactions. Finally, we demonstrate that two previous Smoluchowski approaches to this problem reduce, with various corrections, to a single theory which yields, surprisingly, the same asymptotic density as the renormalization group.
description: 8 pages, 5 figs, minor corrections
Coexistence of long-ranged charge and orbital order and spin-glass state in single-layered manganites with weak quenched disorder
Creators: name: Mathieu, R.
name: He, J. P.
name: Yu, X. Z.
name: Kaneko, Y.
name: Uchida, M.
name: lee, Y. S.
name: Arima, T.
name: Asamitsu, A.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The relationship between orbital and spin degrees of freedom in the single-crystals of the hole-doped Pr$_{1-x}$Ca$_{1+x}$MnO$_4$, 0.3 $\leq$ $x$ $\leq$ 0.7, has been investigated by means of ac-magnetometry and charge transport. Even though there is no cation ordering on the $A$-site, the quenched disorder is extremely weak in this system due to the very similar ionic size of Pr$^{3+}$ and Ca$^{2+}$. A clear asymmetric response of the system to the under- (respective over-) hole doping was observed. The long-ranged charge-orbital order established for half doping ($x$=0.5) subsists in the over-doping case ($x$ $>$ 0.5), albeit rearranged to accommodate the extra holes introduced in the structure. The charge-orbital order is however destabilized by the presence of extra localized electrons (under-doping, $x$ $
description: EPL style; 6 pages, 5 figures
title: К проблеме поиска матриц Адамара порядка 668
title: On Problem of Search for Hadamard Matrices of Order 668
Creators: name: Сергеев, Александр Михайлович
name: Балонин, Юрий Николаевич
Publisher: name: Издательский центр СурГУ
Year: 2021

description: В статье рассматривается проблема вычисления матриц Адамара высоких порядков. Даны определения матриц-близнецов Пропус, Пропус-М и Пропус-Е, а также описан метод их вычисления с использованием матриц Мерсенна и Эйлера и модифицированного массива Вильямсона на основе двух базовых матриц. Показан путь приближения матрицы Адамара порядка 668 через Пропус-М на основе известной матрицы Мерсенна порядка 167 и даны
определения уровней матриц и их портретов. Приведены уравнения связи уровней матриц Пропус-М и Пропус-Е; рассмотрены их свойства, числовые примеры и портреты матриц Пропус-М и Пропус-Е, вычисленные с использованием модифицированного массива Вильямсона.
description: The article describes the problem of calculation of Hadamard matrices of high orders. Definitions of twin matrices, Propus, Propus-M, Propus-E, is given. A method for their calculation via Mersenne and Euler matrices and modified Williamson array, based on two basic matrices, is described. A path of approximation of a Hadamard matrix of order 668 through Propus-M, based on a known Mersenne matrix of order 167, is shown, and definitions of matrices levels and their portraits are given. Equations of connection of Propus-M and Propus-E matrices levels are presented; their properties, numerical examples and portraits of Propus-M and Propus-E matrices calculated via modified Williamson array are analyzed.
Reconciling galaxy cluster shapes, measured by theorists vs observers
Creators: name: Harvey, David
name: Robertson, Andrew
name: Tam, Sut-Ieng
name: Jauzac, Mathilde
name: Massey, Richard
name: Rhodes, Jason
name: McCarthy, Ian G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: If properly calibrated, the shapes of galaxy clusters can be used to investigate many physical processes: from feedback and quenching of star formation, to the nature of dark matter. Theorists frequently measure shapes using moments of inertia of simulated particles'. We instead create mock (optical, X-ray, strong- and weak-lensing) observations of the twenty-two most massive ($\sim10^{14.7}\,M_\odot$) relaxed clusters in the BAHAMAS simulations. We find that observable measures of shape are rounder. Even when moments of inertia are projected into 2D and evaluated at matched radius, they overestimate ellipticity by 56\% (compared to observable strong lensing) and 430\% (compared to observable weak lensing). Therefore, we propose matchable quantities and test them using observations of eight relaxed clusters from the {\emph Hubble Space Telescope} and {\emph Chandra X-Ray Observatory}. We also release our HST data reduction and lensing analysis software to the community. In real clusters, the ellipticity and orientation angle at all radii are strongly correlated. In simulated clusters, the ellipticity of inner ($
description: Accepted to MNRAS
The infrared luminosity function of galaxies at redshifts z=1 and z~2 in the GOODS fields
Creators: name: Caputi, K. I.
name: Lagache, G.
name: Yan, Lin
name: Dole, H.
name: Bavouzet, N.
name: Floc'h, E. Le
name: Choi, P. I.
name: Helou, G.
name: Reddy, N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the rest-frame 8 micron luminosity function (LF) at redshifts z=1 and ~2, computed from Spitzer 24 micron-selected galaxies in the GOODS fields over an area of 291 sq. arcmin. Using classification criteria based on X-ray data and IRAC colours, we identify the AGN in our sample. The rest-frame 8 micron LF for star-forming galaxies at redshifts z=1 and ~2 have the same shape as at z~0, but with a strong positive luminosity evolution. The number density of star-forming galaxies with log_{10}(nu L_nu(8 micron))>11 increases by a factor >250 from redshift z~0 to 1, and is basically the same at z=1 and ~2. The resulting rest-frame 8 micron luminosity densities associated with star formation at z=1 and ~2 are more than four and two times larger than at z~0, respectively. We also compute the total rest-frame 8 micron LF for star-forming galaxies and AGN at z~2 and show that AGN dominate its bright end, which is well-described by a power-law. Using a new calibration based on Spitzer star-forming galaxies at 0
description: Accepted for publication in the ApJ. 33 pages, 15 figures. Uses emulateapj
Galactic Cosmic Rays - Clouds Effect and Bifurcation Model of the Earth Global Climate. Part 1. Theory
Creators: name: Rusov, Vitaliy D.
name: Glushkov, Alexandr V.
name: Vaschenko, Vladimir N.
name: Mykhalus, Oksana T.
name: Bondartchuk, Yuriy A.
name: Smolyar, Vladimir P.
name: Linnik, Elena P.
name: Mavrodiev, Strachimir Cht.
name: Vachev, Boyko I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: Based on theoretical and experimental consideration of the first (the Twomey effect) and second indirect aerosol effects the quasianalytic description of physical connection between the galactic cosmic rays intensity and the Earth's cloud cover is obtained. It is shown that the basic equation of the Earth's climate energy-balance model is described by the bifurcation equation (with respect to the temperature of the Earth's surface) in the form of assembly-type catastrophe with the two governing parameters defining the variations of insolation and Earth's magnetic field (or the galactic cosmic rays intensity in the atmosphere), respectively. The principle of hierarchical climatic models construction, which consists in the structural invariance of balance equations of these models evolving on different time scales, is described.
description: 23 pages, 7 figures
Canadian public opinion and the war in Vietnam, 1954-1973
Creators: name: O’Kane, David James
Publisher: name: University of British Columbia
Year: 2009

description: This thesis investigates the state of Canadian public opinion concerning the war in Vietnam from the time of Canada's initial involvement on the International Control Commission in 1954, to the final pullout of Canadian observers in 1973. The Canadian Institute of Public Opinion polls will form the basis of this examination, but various media publications and government statements will also be used to portray the nature of public debate on this issue. This study is broken down into two periods; from 1954 to 1964 and from 1965 to 1973. The conclusions reached show that fear of communism contributed to significant Canadian public support for American intervention i n Vietnam in the early years of the conflict. It was only near the end of the war, when Canadians began to consider U.S. actions as more dangerous to world peace than revolutionary communism, that support for American policy declined. However, throughout the entire period of this study there was always a large percentage of Canadians who were undecided about the war. This most likely reflects the general apathy of Canadians when confronted with foreign policy questions that had little direct impact on their daily lives. Nevertheless, there was a considerable percentage of the population that was strongly opposed to the American intervention and to what was considered the Canadian government's complicity in prolonging the war. Overall, Canadian attitudes changed slowly and even then only very little.
Jet parameters for a diverse sample of jet-launching post-AGB binaries
Creators: name: Bollen, Dylan
name: Kamath, Devika
name: Van Winckel, Hans
name: De Marco, Orsola
name: Wardle, Mark
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Jets are a commonly observed phenomenon in post-asymptotic giant branch (post-AGB) binaries. Due to the orbital motion of the binary, the jet causes variable absorption in the Balmer profiles. In previous work, we have developed spatio-kinematic and radiative transfer models to reproduce the observed Balmer line variability and derive the spatio-kinematic structure of the jet and its mass-loss rate. Here, we apply our jet model to five post-AGB binaries with distinct Hα line variability and diverse orbital properties. Our models fit the Hα line variations very well. We estimate jet mass-loss rates between 10-8 Mdot yr-1 and 10-4 Mdot yr-1 , from which we deduce accretion rates onto the companion between 10-7 Mdot yr-1 and 10-3 Mdot yr-1 . These accretion rates are somewhat higher than can be comfortably explained with reasonable sources of accretion, but we argue that the circumbinary disc in these systems is most-likely the source feeding the accretion, although accretion from the post-AGB star cannot be ruled out. The diversity of the variability in the five objects is due to their wide ejection cones combined with a range of viewing angles, rather than inherent differences between the objects. The nature of the observations does not let us easily distinguish which jet launching model (stellar jet, disc wind, or X-wind) should be favoured. In conclusion, we show that our jet model includes the physical parameters to successfully reproduce the Hα line variations and retrieve the structure and mass-loss rates of the jet for all five objects that are representative of the diverse sample of Galactic post-AGB binaries.
description: 20 pages, 9 figures, accepted for publication in MNRAS
Generalized Restart Mechanism for Successive-Cancellation Flip Decoding of Polar Codes
Creators: name: Sagitov, Ilshat
name: Pillet, Charles
name: Balatsoukas-Stimming, Alexios
name: Giard, Pascal
Publisher: name: arXiv
Year: 2025
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Polar codes are a class of linear error-correction codes that have received a lot of attention due to their ability to achieve channel capacity in an arbitrary binary discrete memoryless channel (B-DMC) with low-complexity successive-cancellation (SC) decoding. However, practical implementations often require better error-correction performance than what SC decoding provides, particularly at short to moderate code lengths. Successive-cancellation flip (SCF) decoding algorithm was proposed to improve error-correction performance with an aim to detect and correct the first wrongly estimated bit in a codeword before resuming SC decoding. At each additional SC decoding trial, i.e., decoding attempt beyond the initial unsuccessful trial, one bit estimated as the least reliable is flipped. Dynamic SCF (DSCF) is a variation of SCF, where multiple bits may be flipped simultaneously per trial. Despite the improved error-correction performance compared to the SC decoder, SCF-based decoders have variable execution time, which leads to high average execution time and latency. In this work, we propose the generalized restart mechanism (GRM) that allows to skip decoding computations that are identical between the initial trial and any additional trial. Under DSCF decoding with up to 3-bit flips per decoding trial, our proposed GRM is shown to reduce the average execution time by 25% to 60% without any negative effect on error-correction performance. The proposed mechanism is adaptable to state-of-the-art latency-reduction techniques. When applied to Fast-DSCF-3 decoding, the additional reduction brought by the GRM is 15% to 22%. For the DSCF-3 decoder, the proposed mechanism requires approximately 4% additional memory.
description: Accepted in Journal of Signal Processing Systems, 21 pages, 8 figures, 6 tables
Feeding and feedback in nuclei of galaxies
Creators: name: Audibert, Anelise
name: Combes, Françoise
name: García-Burillo, Santiago
name: Dasyra, Kalliopi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Our aim is to explore the close environment of Active Galactic Nuclei (AGN) and its connection to the host galaxy through the morphology and dynamics of the cold gas inside the central kpc in nearby AGN. We report Atacama Large Millimeter/submillimeter Array (ALMA) observations of AGN feeding and feedback caught in action in NGC613 and NGC1808 at high resolution (few pc), part of the NUclei of GAlaxies (NUGA) project. We detected trailing spirals inside the central 100pc, efficiently driving the molecular gas into the SMBH, and molecular outflows driven by the AGN. We present preliminary results of the impact of massive winds induced by radio jets on galaxy evolution, based on observations of radio galaxies from the ALMA Radio-source Catalogue.
description: 5 pages, 3 figures, to be published in Proceeding IAU Symposium No. 359, 2020, "Galaxy evolution and feedback across different environments", Eds. T. Storchi-Bergmann, R. Overzier, W. Forman and R. Riffel
Study of Gribov Copies in the Yang-Mills ensemble
Creators: name: Fiorentini, D.
name: Junior, D. R.
name: Oxman, L. E.
name: Simões, G. M.
name: Sobreiro, R. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Recently, based on a new procedure to quantize the theory in the continuum, it was argued that Singer's theorem points towards the existence of a Yang-Mills ensemble. In the new approach, the gauge fields are mapped into an auxiliary field space used to separately fix the gauge on different sectors labeled by center vortices. In this work, we study this procedure in more detail. We provide examples of configurations belonging to sectors labeled by center vortices and discuss the existence of nonabelian degrees of freedom. Then, we discuss the importance of the mapping injectivity, and show that this property holds infinitesimally for typical configurations of the vortex-free sector and for the simplest example in the one-vortex sector. Finally, we show that these configurations are free from Gribov copies.
description: 18 pages
Stability of the Higgs Sector in a Flavor-Inspired Multi-Scale Model
Creators: name: Allwicher, Lukas
name: Isidori, Gino
name: Thomsen, Anders Eller
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the stability of the Higgs sector of a three-site model with flavor-non-universal gauge interactions, whose spectrum of non-Standard-Model states spans three orders of magnitude. This model is inspired by deconstructing a five-dimensional theory where the generation index is in one-to-one relation to the position in the fifth dimension. It provides a good description of masses and mixing of the SM fermions in terms of scale hierarchies. We demonstrate that, within this construction, the mass term of the SM-like Higgs does not receive large corrections proportional to the highest mass scales. The model suffers only of the unavoidable "little hierarchy problem" between the electroweak scale and the lightest NP states, which are expected to be at the TeV scale.
description: 17 pages, 1 figure, 2 tables