cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Strange metal phase of disordered magic-angle twisted bilayer graphene at low temperatures: from flatbands to weakly coupled Sachdev-Ye-Kitaev bundles
Creators: name: Wei, Chenan
name: Sedrakyan, Tigran A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We use stochastic expansion and exact diagonalization to study the magic-angle twisted bilayer graphene (TBG) on a disordered substrate. We show that the substrate-induced strong Coulomb disorder in TBG with the chemical potential at the level of the flatbands drives the system to a network of weakly coupled Sachdev-Ye-Kitaev (SYK) bundles, stabilizing an emergent quantum chaotic strange metal (SM) phase of TBG that exhibits the absence of quasiparticles. The Gaussian orthogonal ensemble dominates TBG's long-time chaotic dynamics at strong disorder, whereas fast quantum scrambling appears in the short-time dynamics. In weak disorder, gapped phases of TBG exhibit exponentially decaying specific heat capacity and exponential decay in out-of-time-ordered correlators (OTOC). This is the system behavior in correlated insulator and superconducting phases, in agreement with the corresponding Larkin-Ovchinnikov result for correlators. The result suggests a low-temperature transition from the superconducting and correlated insulating phases into the strange metal upon increasing the disorder strength. We propose a finite-temperature phase diagram for Coulomb-disordered TBG and discuss the experimental consequences of the emergent SM phase.
description: 10 pages, 5 figures
Observational Results of a Multi-Telescope Campaign in Search of Interstellar Urea [(NH$_2$)$_2$CO]
Creators: name: Remijan, Anthony J.
name: Snyder, Lewis E.
name: McGuire, Brett A.
name: Kuo, Hsin-Lun
name: Looney, Leslie W.
name: Friedel, Douglas N.
name: Golubiatnikov, G. Yu
name: Lovas, Frank J.
name: Ilyushin, V. V.
name: Alekseev, E. A.
name: Dyubko, S. F.
name: McCall, Benjamin J.
name: Hollis, Jan M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this paper, we present the results of an observational search for gas phase urea [(NH$_2$)$_2$CO] observed towards the Sgr B2(N-LMH) region. We show data covering urea transitions from $\sim$100 GHz to 250 GHz from five different observational facilities: BIMA, CARMA, the NRAO 12 m telescope, the IRAM 30 m telescope, and SEST. The results show that the features ascribed to urea can be reproduced across the entire observed bandwidth and all facilities by best fit column density, temperature, and source size parameters which vary by less than a factor of 2 between observations merely by adjusting for telescope-specific parameters. Interferometric observations show that the emission arising from these transitions is cospatial and compact, consistent with the derived source sizes and emission from a single species. Despite this evidence, the spectral complexity, both of (NH$_2$)$_2$CO and of Sgr B2(N), makes the definitive identification of this molecule challenging. We present observational spectra, laboratory data, and models, and discuss our results in the context of a possible molecular detection of urea.
description: 38 pages, 9 Figures, accepted in the Astrophysical Journal
A Multifidelity Approach to Robust Orbit Determination
Creators: name: Fossà, Alberto
name: Armellin, Roberto
name: Delande, Emmanuel
name: Losacco, Matteo
name: Sanfedino, Francesco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper presents an algorithm for the preprocessing of observation data aimed at improving the robustness of orbit determination tools. Two objectives are fulfilled: obtain a refined solution to the initial orbit determination problem and detect possible outliers in the processed measurements. The uncertainty on the initial estimate is propagated forward in time and progressively reduced by exploiting sensor data available in said propagation window. Differential algebra techniques and a novel automatic domain splitting algorithm for second-order Taylor expansions are used to efficiently propagate uncertainties over time. A multifidelity approach is employed to minimize the computational effort while retaining the accuracy of the propagated estimate. At each observation epoch, a polynomial map is obtained by projecting the propagated states onto the observable space. Domains that do no overlap with the actual measurement are pruned thus reducing the uncertainty to be further propagated. Measurement outliers are also detected in this step. The refined estimate and retained observations are then used to improve the robustness of batch orbit determination tools. The effectiveness of the algorithm is demonstrated for a geostationary transfer orbit object using synthetic and real observation data from the TAROT network.
description: accepted for publication in Acta Astronautica
Sums of squares and varieties of minimal degree
Creators: name: Blekherman, Grigoriy
name: Smith, Gregory G.
name: Velasco, Mauricio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14P05, 12D15, 90C22

description: Let X be a real nondegenerate projective subvariety such that its set of real points is Zariski dense. We prove that every real quadratic form that is nonnegative on X is a sum of squares of linear forms if and only if X is a variety of minimal degree. This substantially extends Hilbert's celebrated characterization of equality between nonnegative forms and sums of squares. We obtain a complete list for the cases of equality and also a classification of the lattice polytopes Q for which every nonnegative Laurent polynomial with support contained in 2Q is a sum of squares.
Renormalisation group flows connecting a $4-ε$ dimensional Hermitian field theory to a $\mathcal{PT}$-symmetric theory for a fermion coupled to an axion
Creators: name: Croney, Lewis
name: Sarkar, Sarben
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The renormalisation group flow of a Hermitian field theory is shown to have trajectories which lead to a non-Hermitian Parity-Time ($\mathcal{PT}$) symmetric field theory for an axion coupled to a fermion in spacetime dimensions $D=4-ε$, where $ε>0 $. In this renormalisable field theory, the Dirac fermion field has a Yukawa coupling $g$ to a pseudoscalar (axion) field and there is quartic pseudoscalar self-coupling $u$. The robustness of this finding is established by considering flows between $ε$ dpependent Wilson-Fisher fixed points and also by working to \emph{three loops} in the Yukawa coupling and to \emph{two loops} in the quartic scalar coupling. The flows in the neighbourhood of the non-trivial fixed points are calculated using perturbative analysis, together with the $ε$ expansion. The global flow pattern indicates flows from positive $u$ to negative $u$; there are no flows between real and imaginary $g$. Using summation techniques we demonstrate a possible non-perturbative $\mathcal{PT}$-symmetric saddle point for $D=3$.
description: 26 pages, 10 figures, updated to match version accepted in PRD
Resource-Efficient Quantum Simulation of Lattice Gauge Theories in Arbitrary Dimensions: Solving for Gauss' Law and Fermion Elimination
Creators: name: Pardo, Guy
name: Greenberg, Tomer
name: Fortinsky, Aryeh
name: Katz, Nadav
name: Zohar, Erez
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Quantum simulation of Lattice Gauge Theories has been proposed and used as a method to overcome theoretical difficulties in dealing with the non-perturbative nature of such models. In this work we focus on two important bottlenecks that make developing such simulators hard: one is the difficulty of simulating fermionic degrees of freedom, and the other is the redundancy of the Hilbert space, which leads to a waste of experimental resources and the need to impose and monitor the local symmetry constraints of gauge theories. This has previously been tackled in one dimensional settings, using non-local methods. Here we show an alternative procedure for dealing with these problems, which removes the matter and the Hilbert space redundancy, and is valid for higher space dimensions. We demonstrate it for a $\mathbb{Z}_2$ lattice gauge theory and implement it experimentally via the IBMQ cloud quantum computing platform.
description: v2: new experimental section introduced
Lie graph homology model for $\mathfrak{grt}_1$
Creators: name: Ward, Benjamin C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Topology (math.AT)
subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics

description: This paper develops a new chain model for the commutative graph complex $\mathsf{GC}_2$ which takes Lie graph homology as an input. Our main technical result is the identification of a large contractible complex of (certain) tadpoles and higher genus vertices of the Feynman transform of Lie graph homology. Using this result we identify the anti-invarints of Lie graph homology in genus $2$ with relations between bracketings of conjectural generators of $\mathfrak{grt}_1$ in depth 2 modulo depth 3, unifying two a priori disparate appearances of the space of modular cusp forms in the study of graph homology.
description: minor revisions, final version
title: Уроки создания нефтяной промышленности в Ханты-Мансийском автономном округе – Югре
title: Lessons of Oil Industry Development in the Khanty-Mansiysk Autonomous Okrug – Ugra
Creators: name: Карпов, Виктор Петрович
name: Комгорт, Марина Валерьевна
Publisher: name: Издательский центр СурГУ
Year: 2022

description: Предпринята попытка взглянуть на историю создания нефтяной промышленности Ханты-Мансийского автономного округа – Югры (ХМАО) в широкой перспективе – от истоков
проекта до его реализации. Анализируется технология принятия решений по развитию экономики
округа, рассмотрено изменение ее структуры в результате индустриализации. Особое внимание уделено ошибкам в решении социальных вопросов, причинам торможения научно-технического прогресса.
Объясняется, как в условиях системного кризиса 1970-х–1980-х, при дефиците времени и ресурсов государство и регион подменили долговременную перспективу развития северного округа текущими интересами. Показано взаимовлияние общегосударственных и региональных политических и экономических интересов и процессов.
description: An attempt was made to look at the history of oil industry development in the KhantyMansiysk Autonomous Okrug – Ugra (KhMAO) from the very start of the project to its implementation.
A decision making technology for the development of the Okrug economy is analyzed, its structure change
as a result of industrialization is considered. Particular attention is paid to wrong solutions in settling social
issues and to the reasons of technological advances retardation. It is explained how the state and the region
authorities substituted a long-term perspective of the northern Okrug development with current interests
during the crisis of 1970s–1980s under the lack of time and resources. Mutual interaction of national and
regional political and economic interests and processes is demonstrated.
Phase-Averaged Gamma-Ray Spectra from MSPs
Creators: name: Jiang, Z. J.
name: Chen, S. B.
name: Li, X.
name: Zhang, L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: {\it Fermi}-LAT has detected pulsed gamma-ray emissions with high confidences from more than 40 millisecond pulsars (MSPs). Here we study the phase-averaged gamma-ray properties of MSPs by using revised version of a self-consistent outer gap model. In this model, a strong multipole magnetic field near the stellar surface for a MSP is assumed and such a field will be close to the surface magnetic fields ($\sim 10^{11}- 10^{12}$ G) of young ulsars; the outer gap of a MSP is controlled by photon-photon pair production process, where the effects of magnetic inclination angle ($α$) and magnetic geometry have been taken into account, therefore the fractional size of the outer gap is a function of not only pulsar's period and magnetic field strength but also magnetic inclination angle and radial distance to the neutron star, the inner boundary of the outer gap can be estimated by the pair production process of the gamma-ray photons which are produced by the back-flowing particles through the null charge surface; inside the outer gap, a Gaussian distribution of the parallel electric field along the trans-field thickness is assumed, and the gamma-ray emission is represented by the emission from the average radial distance along the central field lines of the outer gap. Using this model, the phase-averaged gamma-ray spectra are calculated and compared with the observed spectra of 37 MSPs given by the second {\it Fermi}-LAT catalog of gamma-ray pulsars, our results show that the {\it Fermi}-LAT results can be well explained by this model. The thermal X-ray emission properties from MSPs are also investigated.
description: 12pages, 3 figures, accepted for publication in MNRAS
Energy and Transverse Momentum Fluctuations in the Equilibrium Quantum Systems
Creators: name: Gorenstein, M. I.
name: Rybczynski, M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The fluctuations in the ideal quantum gases are studied using the strongly intensive measures $Δ[A,B]$ and $Σ[A,B]$ defined in terms of two extensive quantities $A$ and $B$. In the present paper, these extensive quantities are taken as the motional variable, $A=X$, the system energy $E$ or transverse momentum $P_T$, and number of particles, $B=N$. This choice is most often considered in studying the event-by-event fluctuations and correlations in high energy nucleus-nucleus collisions. The recently proposed special normalization ensures that $Δ$ and $Σ$ are dimensionless and equal to unity for fluctuations given by the independent particle model. In statistical mechanics, the grand canonical ensemble formulation within the Boltzmann approximation gives an example of independent particle model. Our results demonstrate the effects due to the Bose and Fermi statistics. Estimates of the effects of quantum statistics in the hadron gas at temperatures and chemical potentials typical for thermal models of hadron production in high energy collisions are presented. In the case of massless particles and zero chemical potential the $Δ$ and $Σ$ measures are calculated analytically.
description: 17 pages, 3 figures
Remarks on Catalan's equation over function fields
Creators: name: Ray, Anwesh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11D41, 11R58

description: Let $\ell$ be a prime number, $F$ be a global function field of characteristic $\ell$. Assume that there is a prime $P_\infty$ of degree $1$. Let $\mathcal{O}_F$ be the ring of functions in $F$ with no poles outside of $\{P_\infty\}$. We study solutions to Catalan's equation $X^m-Y^n=1$ over $\mathcal{O}_F$ and show that under certain additional conditions, there are no non-constant solutions which lie in $\mathcal{O}_F$, when $m,n>1$.
description: Version 6: Minor changes, accepted for publication in Finite fields and their applications
Data for: Predicting age and mass at maturity from feeding behavior and diet in M. sexta: An empirical test of a life history model
Creators: name: Parker, Anna
name: Albright, Anna
name: Kingsolver, Joel
name: Legault, Geoffrey
Publisher: name: Zenodo
Year: 2023
Subjects: Feeding behavior
diet quality
life history
stochastic modeling
Body size

description: Feeding for most animals involves bouts of active ingestion alternating with bouts of no ingestion. In insects, the temporal patterning of bouts varies widely with resource quality and is known to affect growth, development time, and fitness. However, the precise impacts of resource quality and feeding behavior on insect life history traits is poorly understood. To explore and better understand the connections between feeding behavior, resource quality and insect life history traits, we combined laboratory experiments with a recently proposed mechanistic model of insect growth and development for a larval herbivore, Manduca sexta. We ran feeding trials for 4th and 5th instar larvae across different diet types (two hostplants and artificial diet) and used these data to parameterize a joint model of age and mass at maturity that incorporates both insect feeding behavior and hormonal activity. We found that the estimated durations of both feeding and non-feeding bouts were significantly shorter on low- than on high-quality diets. We then explored how well the fitted model predicted historical out-of-sample data on age and mass of M. sexta. We found that the model accurately described qualitative outcomes for the out-of-sample data, notably that a low-quality diet results in reduced mass and later age at maturity compared to high-quality diets. Our results clearly demonstrate the importance of diet quality on multiple components of insect feeding behavior (feeding and non-feeding), and partially validate a joint model of insect life history. We discuss the implications of these findings with respect to insect herbivory and discuss ways in which our model could be improved or extended to other systems.
description: Funding provided by: National Science Foundation
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100000001
Award Number: IOS-2029156
Investigation of $(g-2)_μ$ anomaly in the $μ$-specific 2HDM with Vector like leptons and the phenomenological implications
Creators: name: Raju, Md.
name: Mukherjee, Abhi
name: Saha, Jyoti Prasad
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The anomalous magnetic moment of muons has been a long-standing problem in SM. The current deviation of experimental value of the $(g-2)_μ$ from the standard model prediction is exactly $4.2σ$. Two Higgs Doublet Models can accommodate this discrepancy but such type of model naturally generate flavor changing neutral current(FCNC). To prevent this it was postulated that 2HDM without FCNC required that all fermions of a given charge couple to the same Higgs boson but the rule breaks in Muon Specific Two Higgs Doublet Model where all fermions except muon couple to one Higgs doublet and muon with the other Higgs doublet. The Muon Specific Two Higgs Doublet model explain muon anomaly with a fine tuning problem of very large $\tanβ$ value with other parameters. We have found a simple solution of this fine tuning problem by extending this model with a vector like lepton generation which could explain the muon anomaly at low $\tanβ$ value with a heavy pseudo scalar Higgs boson under the shadow of current experimental and theoretical constraints. Moreover, with the help of the cut based analysis and multivariate analysis methods, we have also attempted to shed some light on the potential experimental signature of vector lepton decay to the heavy Higgs boson in the LHC experiment. We have showed that a multivariate analysis can increase the vector like leptons signal significance by up to an order of magnitude than that of a cut based analysis.
description: 24 pages and multiple figures, comments are welcome
Coupling and thermal equilibrium in general-covariant systems
Creators: name: Chirco, Goffredo
name: Haggard, Hal M.
name: Rovelli, Carlo
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A fully general-covariant formulation of statistical mechanics is still lacking. We take a step toward this theory by studying the meaning of statistical equilibrium for coupled, parametrized systems. We discuss how to couple parametrized systems. We express the thermalization hypothesis in a general-covariant context. This takes the form of vanishing of information flux. An interesting relation emerges between thermal equilibrium and gauge.
description: 8 pages, 3 figures
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿ÐµÑÐ²Ð¾Ð¹ ÑÐ¾Ð¿Ð»Ð¸Ð²Ð½Ð¾Ð¹ Ð·Ð°Ð³ÑÑÐ·ÐºÐ¸ ÑÐµÐ°ÐºÑÐ¾ÑÐ° ÐÐÐ­Ð -1200 Ð´Ð»Ñ 24-Ð¼ÐµÑÑÑÐ½Ð¾Ð³Ð¾ ÑÐ¾Ð¿Ð»Ð¸Ð²Ð½Ð¾Ð³Ð¾ ÑÐ¸ÐºÐ»Ð°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° ÑÐ¿ÐµÑÐ¸Ð°Ð»Ð¸ÑÑÐ°
titleType: Subtitle
title: Development of the first fuel loading of the VVER-1200 reactor for a 24-month fuel cycle
Creators: name: ÐÐ²Ð°Ð½Ð¾Ð², ÐÐ¸ÑÐ°Ð¸Ð»
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2025
Subjects: Ð²Ð²ÑÑ-1200
Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ
serpent
Ð²ÑÐ³Ð¾ÑÐ°ÑÑÐ¸Ðµ Ð¿Ð¾Ð³Ð»Ð¾ÑÐ¸ÑÐµÐ»Ð¸
Ð¼Ð¸Ð½Ð¾ÑÐ½ÑÐµ Ð°ÐºÑÐ¸Ð½Ð¾Ð¸Ð´Ñ
ÑÐ¾ÑÐ¼ÑÐ»Ð° ÑÐµÑÑÑÑÑ ÑÐ¾Ð¼Ð½Ð¾Ð¶Ð¸ÑÐµÐ»ÐµÐ¹
Ð¶ÑÑÑÐºÐ¾ÑÑÑ ÑÐ¿ÐµÐºÑÑÐ° Ð½ÐµÐ¹ÑÑÐ¾Ð½Ð¾Ð²
vver-1200
modeling
burnable absorbers
minor actinides
four factor formula
neutron spectrum hardness

description: Ð Ð°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ð¸Ñ Ð²Ð¾Ð·Ð¼Ð¾Ð¶Ð½ÑÑ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ¾Ð² Ð¿ÐµÑÐ²Ð¾Ð¹ ÑÐ¾Ð¿Ð»Ð¸Ð²Ð½Ð¾Ð¹ Ð·Ð°Ð³ÑÑÐ·ÐºÐ¸ ÐÐÐ­Ð -1200, ÑÐ°ÑÑÑÐ¸ÑÐ°Ð½Ð½Ð¾Ð¹ Ð½Ð° 24-Ð¼ÐµÑÑÐ½ÑÑ ÐºÐ°Ð¼Ð¿Ð°Ð½Ð¸Ñ ÑÐµÐ°ÐºÑÐ¾ÑÐ°, Ð¸ Ð¾Ð±Ð¾ÑÐ½Ð¾Ð²Ð°Ð½Ð¸Ñ Ð²ÑÐ±Ð¾ÑÐ° Ð¾Ð´Ð½Ð¾Ð³Ð¾ Ð¸Ð· Ð½Ð¸Ñ Ð² ÑÐ¾Ð´Ðµ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ñ Ð¿Ð¾ Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÑÐ½Ð½ÑÐ¼ ÐºÑÐ¸ÑÐµÑÐ¸ÑÐ¼. Ð Ð°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÐ¼ÑÐµ Ð²Ð°ÑÐ¸Ð°Ð½ÑÑ ÑÐ°Ð·Ð»Ð¸ÑÐ°ÑÑÑÑ ÐºÐ°Ðº Ð¿Ð¾ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»ÑÐ½Ð¾Ð¼Ñ ÑÐ¾ÑÑÐ°Ð²Ñ, ÑÐ°Ðº Ð¸ Ð¿Ð¾ ÐºÐ¾Ð¼Ð¿Ð¾Ð½Ð¾Ð²ÐºÐµ Ð°ÐºÑÐ¸Ð²Ð½Ð¾Ð¹ Ð·Ð¾Ð½Ñ. ÐÐ¾Ð¼Ð¸Ð¼Ð¾ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÐºÐ°Ð¼Ð¿Ð°Ð½Ð¸Ð¸ Ð´Ð»Ñ Ð²ÑÐ±ÑÐ°Ð½Ð½Ð¾Ð³Ð¾ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ° Ð·Ð°Ð³ÑÑÐ·ÐºÐ¸ Ð°ÐºÑÐ¸Ð²Ð½Ð¾Ð¹ Ð·Ð¾Ð½Ñ ÑÐ°ÐºÐ¶Ðµ Ð¿ÑÐ¾Ð²Ð¾Ð´ÑÑÑÑ ÑÐ°ÑÑÑÑÑ Ð¸ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ðµ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐ¾Ð², Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÑ ÑÐ°Ð·Ð½ÑÐ¼Ð¸ Ð¼ÐµÑÐ¾Ð´Ð°Ð¼Ð¸. Ð ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐµ ÑÐ°Ð±Ð¾ÑÑ Ð±ÑÐ»Ð¸ ÑÐ¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ñ ÐºÐ°Ð¼Ð¿Ð°Ð½Ð¸Ð¸ ÑÐµÐ°ÐºÑÐ¾ÑÐ° Ð² Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ðµ Serpent, Ð¾Ð±Ð¾ÑÐ½Ð¾Ð²Ð°Ð½ Ð²ÑÐ±Ð¾Ñ ÑÐ¼ÐµÑÐ°Ð½Ð½Ð¾Ð³Ð¾ Ð²ÑÐ³Ð¾ÑÐ°ÑÑÐµÐ³Ð¾ Ð¿Ð¾Ð³Ð»Ð¾ÑÐ¸ÑÐµÐ»Ñ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð¾ÐºÑÐ¸Ð´Ð¾Ð² Ð³Ð°Ð´Ð¾Ð»Ð¸Ð½Ð¸Ñ, ÑÑÐ±Ð¸Ñ Ð¸ Ð¼Ð¸Ð½Ð¾ÑÐ½ÑÑ Ð°ÐºÑÐ¸Ð½Ð¾Ð¸Ð´Ð¾Ð² Ð¸ Ð´Ð°Ð½Ñ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ ÑÐ¾ÑÐ¼ÑÐ»Ñ ÑÐµÑÑÑÑÑ ÑÐ¾Ð¼Ð½Ð¾Ð¶Ð¸ÑÐµÐ»ÐµÐ¹.
description: The work is devoted to the consideration of possible options for the first fuel loading of the VVER-1200, designed for a 24-month reactor campaign, and the justification for choosing one of them during comparison according to certain criteria. The options under consideration differ both in material composition and in the layout of the core. In addition to modeling the campaign, calculations and comparison of the results obtained by different methods are also carried out for the selected option of loading the core. As a result of the work, reactor campaigns in the Serpent program were modeled, the choice of a mixed burnout absorber based on gadolinium, erbium and minor actinides was justified, and recommendations for the use of the four-factor method were given.
Contagion dynamics on hypergraphs with nested hyperedges
Creators: name: Kim, Jihye
name: Lee, Deok-Sun
name: Goh, Kwang-Il
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In complex social systems encoded as hypergraphs, higher-order (i.e., group) interactions taking place among more than two individuals are represented by hyperedges. One of the higher-order correlation structures native to hypergraphs is the nestedness: Some hyperedges can be entirely contained (that is, nested) within another larger hyperedge, which itself can also be nested further in a hierarchical manner. Yet the effect of such hierarchical structure of hyperedges on the dynamics has remained unexplored. In this context, here we propose a random nested-hypergraph model with a tunable level of nestedness and investigate the effects of nestedness on a higher-order susceptible-infected-susceptible process. By developing an analytic framework called the facet approximation, we obtain the steady-state fraction of infected nodes on the random nested-hypergraph model more accurately than existing methods. Our results show that the hyperedge-nestedness affects the phase diagram significantly. Monte Carlo simulations support the analytical results.
description: 8 pages, 6 figures
Magnified Views of the Ultrafast Outflow of the z = 1.51 AGN HS 0810+2554
Creators: name: Chartas, G.
name: Hamann, F.
name: Eracleous, M.
name: Misawa, T.
name: Cappi, M.
name: Giustini, M.
name: Charlton, J. C.
name: Marvin, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present results from an observation of the gravitationally lensed z=1.51 narrow absorption line AGN HS 0810+2554 performed with the Chandra X-ray Observatory. The factor of ~100 lensing magnification of HS 0810+2554 makes this source exceptionally bright. Absorption lines are detected at rest-frame energies of ~ 7.7 keV and ~11.0 keV at >97% significance. By interpreting these lines to arise from highly ionized iron the implied outflow velocities of the X-ray absorbing gas corresponding to these lines are 0.13c and 0.41c, respectively. The presence of these relativistic outflows and the absence of any significant low-energy X-ray absorption suggest that a shielding gas is not required for the generation of the relativistic X-ray absorbing winds in HS 0810+2554. UV spectroscopic observations with VLT/UVES indicate that the UV absorbing material is outflowing at v_UV ~0.065c. Our analysis indicates that the fraction of the total bolometric energy released by HS 0810+2554 into the IGM in the form of kinetic energy is epsilon_k = 1.0(-0.6,+0.8). An efficiency of greater than unity implies that magnetic driving is likely a significant contributor to the acceleration of this X-ray absorbing wind. We also estimate the mass-outflow rate of the strongest absorption component to be Mdot_abs=1.1(-0.7,+0.9) M_solar yr^-1. Assuming that the energetic outflow detected in the NAL AGN HS 0810+2554 is a common property of most AGN it would suggest that the X-ray absorbing wind may have a larger opening angle than previously thought. This has important consequences for estimating the feedback contribution of X-ray absorbing winds to the surrounding IGM.
description: 25 pages, includes 11 figures, Accepted for publication in ApJ
TACHYON: Efficient Shared Memory Parallel Computation of Extremum Graphs
Creators: name: Ande, Abhijath
name: Subhash, Varshini
name: Natarajan, Vijay
Publisher: name: arXiv
Year: 2023
Subjects: subject: Graphics (cs.GR)
subject: Computational Geometry (cs.CG)
subject: FOS: Computer and information sciences

description: The extremum graph is a succinct representation of the Morse decomposition of a scalar field. It has increasingly become a useful data structure that supports topological feature directed visualization of 2D / 3D scalar fields, and enables dimensionality reduction together with exploratory analysis of high dimensional scalar fields. Current methods that employ the extremum graph compute it either using a simple sequential algorithm for computing the Morse decomposition or by computing the more detailed Morse-Smale complex. Both approaches are typically limited to two and three dimensional scalar fields. We describe a GPU-CPU hybrid parallel algorithm for computing the extremum graph of scalar fields in all dimensions. The proposed shared memory algorithm utilizes both fine grained parallelism and task parallelism to achieve efficiency. An open source software library, TACHYON, that implements the algorithm exhibits superior performance and good scaling behavior.
description: Appeared in Computer Graphics Forum, 2023
A learning by confusion approach to characterize phase transitions
Creators: name: Richter-Laskowska, Monika
name: Kurpas, Marcin
name: Maśka, Maciej
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Recently, the learning by confusion (LBC) approach has been proposed as a machine learning tool to determine the critical temperature Tc of phase transitions without any prior knowledge of its even approximate value. However, the effectiveness of the method has been demonstrated only for continuous phase transitions, where confusion can result only from a deliberate incorrect labeling of the data and not from the coexistence of different phases. To verify whether the confusion scheme can also be used for discontinuous phase transitions, in this work, we apply the LBC method to three microscopic models, the Blume-Capel, the q-state Potts, and the Falicov-Kimball models, which undergo continuous or discontinuous phase transitions depending on model parameters. With the help of a simple model, we predict that the phase coexistence present in discontinuous phase transitions can make the neural network more confused and thus decrease its performance. However, numerical calculations performed for the models mentioned above indicate that other aspects of this kind of phase transition are more important and can render the LBC method less effective. Nevertheless, we demonstrate that in some cases the same aspects allow us to use the LBC method to identify the order of a phase transition
Advanced channel coding for space mission telecommand links
Creators: name: Baldi, Marco
name: Bianchi, Marco
name: Chiaraluce, Franco
name: Garello, Roberto
name: Sanchez, Ignacio Aguilar
name: Cioni, Stefano
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We investigate and compare different options for updating the error correcting code currently used in space mission telecommand links. Taking as a reference the solutions recently emerged as the most promising ones, based on Low-Density Parity-Check codes, we explore the behavior of alternative schemes, based on parallel concatenated turbo codes and soft-decision decoded BCH codes. Our analysis shows that these further options can offer similar or even better performance.
description: 5 pages, 7 figures, presented at IEEE VTC 2013 Fall, Las Vegas, USA, Sep. 2013 Proc. IEEE Vehicular Technology Conference (VTC 2013 Fall), ISBN 978-1-6185-9, Las Vegas, USA, Sep. 2013
Appen from Parthenogenesis in dipterans: a genetic perspective
Creators: name: Sperling, A. L.
name: Glover, D. M.
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: Developmental Biology

description: Appendices I and II and Supplementary Tables 1 and 2
"Inappropriate Prescribing and Availability of Medication Safety and Medication Management Services in Older Patients in Europe" (miniposter). AGE Platform EUROPE global campaign "Ageing Equal". October 2019
Creators: name: Brkič, Jovana
name: Fialová, Daniela
Publisher: name: Zenodo
Year: 2019
Subjects: medication use
ageism
age
Age Platform Europe
Aging Equal
policy campaing

description: Blog post text and miniposter on medication use in older patients and aspects of ageism - policy report (dissemination) during the Age Platform Europe policy campaign "Ageing Equal", October 2019. See also http://ageing-equal.org/how-is-ageism-linked-to-inappropriate-medication-use/
Lorentzian quantum gravity via Pachner moves: one-loop evaluation
Creators: name: Borissova, Johanna N.
name: Dittrich, Bianca
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Lorentzian quantum gravity is believed to cure the pathologies encountered in Euclidean quantum gravity, such as the conformal factor problem. We show that this is the case for the Lorentzian Regge path integral expanded around a flat background. We illustrate how a subset of local changes of the triangulation, so-called Pachner moves, allow to isolate the indefinite nature of the gravitational action at the discrete level. The latter can be accounted for by oppositely chosen deformed contours of integration. Moreover, we construct a discretization-invariant local path integral measure for 3D Lorentzian Regge calculus and point out obstructions in defining such a measure in 4D. We see the work presented here as a first step towards establishing the existence of the non-perturbative Lorentzian path integral for Regge calculus and related frameworks such as spin foams. An extensive appendix provides an overview of Lorentzian Regge calculus, using the recently introduced concept of the complexified Regge action, and derives useful geometric formulae and identities needed in the main text.
description: v2: section II.A added; matches published version
Global efficiency and network structure of urban traffic flows: A percolation-based empirical analysis
Creators: name: Kwon, Yungi
name: Jung, Jung-Hoon
name: Eom, Young-Ho
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Making the connection between the function and structure of networked systems is one of the fundamental issues in complex systems and network science. Urban traffic flows are related to various problems in cities and can be represented as a network of local traffic flows. To identify an empirical relation between the function and network structure of urban traffic flows, we construct a time-varying traffic flow network of a megacity, Seoul, and analyze its global efficiency with a percolation-based approach. Comparing the real-world traffic flow network with its corresponding null-model network having a randomized structure, we show that the real-world network is less efficient than its null-model network during rush hour, yet more efficient during non-rush hour. We observe that in the real-world network, links with the highest betweenness tend to have lower quality during rush hour compared to links with lower betweenness, but higher quality during non-rush hour. Since the top betweenness links tend to be the bridges that connect the network together, their congestion has a stronger impact on the network's global efficiency. Our results suggest that the spatial structure of traffic flow networks is important to understand their function.
description: 8 pages, 4 figures
Anderson localization for the completely resonant phases
Creators: name: Liu, Wencai
name: Yuan, Xiaoping
Publisher: name: arXiv
Year: 2013
Subjects: subject: Spectral Theory (math.SP)
subject: FOS: Mathematics

description: For the almost Mathieu operator $ (H_{λ,α,θ}u) (n)=u(n+1)+u(n-1)+ λv(θ+nα)u(n)$, Avila and Jitomirskaya guess that for every phase $ θ\in \mathscr{R} \triangleq\{θ\in \mathbb{R}\;| \; 2θ+ α\mathbb{Z} \in \mathbb{Z}\}$, $H_{λ,α,θ}$ satisfies Anderson localization if $ |λ| > e^{ 2 β}$. In the present paper, we show that for every phase $ θ\in \mathscr{R} $, $H_{λ,α,θ}$ satisfies Anderson localization if $ |λ| > e^{ 7 β}$.
description: arXiv admin note: substantial text overlap with arXiv:1311.0490
Airfoil Optimization using Design-by-Morphing
Creators: name: Sheikh, Haris Moazam
name: Lee, Sangjoon
name: Wang, Jinge
name: Marcus, Philip S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Geometric Topology (math.GT)
subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We present Design-by-Morphing (DbM), a novel design methodology applicable to creating a search space for topology optimization of 2D airfoils. Most design techniques impose geometric constraints and sometimes designers' bias on the design space itself, thus restricting the novelty of the designs created, and only allowing for small local changes. We show that DbM methodology does not impose any such restrictions on the design space and allows for extrapolation from the search space, thus granting truly radical and large search space with a few design parameters. In comparison to other shape design methodologies, we apply DbM to create a search space for 2D airfoils. We optimize this airfoil shape design space for maximizing the lift-over-drag ratio, $CLD_{max}$, and stall angle tolerance, $Δα$. Using a bi-objective genetic algorithm to optimize the DbM space, it is found that we create a Pareto-front of radical airfoils exhibiting remarkable properties for both objectives.
Projectability disentanglement for accurate and automated electronic-structure Hamiltonians
Creators: name: Qiao, Junfeng
name: Pizzi, Giovanni
name: Marzari, Nicola
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Maximally-localized Wannier functions (MLWFs) are a powerful and broadly used tool to characterize the electronic structure of materials, from chemical bonding to dielectric response to topological properties. Most generally, one can construct MLWFs that describe isolated band manifolds, e.g. for the valence bands of insulators, or entangled band manifolds, e.g. in metals or describing both the valence and the conduction manifolds in insulators. Obtaining MLWFs that describe a target manifold accurately and with the most compact representation often requires chemical intuition and trial and error, a challenging step even for experienced researchers and a roadblock for automated high-throughput calculations. Here, we present a powerful approach that automatically provides MLWFs spanning the occupied bands and their natural complement for the empty states, resulting in Wannier Hamiltonian models that provide a tight-binding picture of optimized atomic orbitals in crystals. Key to the success of the algorithm is the introduction of a projectability measure for each Bloch state onto atomic orbitals (here, chosen from the pseudopotential projectors) that determines if that state should be kept identically, discarded, or mixed into a disentangling algorithm. We showcase the accuracy of our method by comparing a reference test set of 200 materials against the selected-columns-of-the-density-matrix algorithm, and its reliability by constructing Wannier Hamiltonians for 21737 materials from the Materials Cloud.
description: 14 pages, 9 figures
Groupoids and skeletal categories form a pretorsion theory in $\mathsf{Cat}$
Creators: name: Borceux, Francis
name: Campanini, Federico
name: Gran, Marino
name: Tholen, Walter
Publisher: name: arXiv
Year: 2022
Subjects: subject: Category Theory (math.CT)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 18E40, 18A22 (Primary) 18B40, 18A40 (secondary)

description: We describe a pretorsion theory in the category $Cat$ of small categories: the torsion objects are the groupoids, while the torsion-free objects are the skeletal categories, i.e., those categories in which every isomorphism is an automorphism. We infer these results from two unexpected properties of coequalizers in $Cat$ that identify pairs of objects: they are faithful and reflect isomorphisms.
description: 17 pages
Post LHC8 SUSY benchmark points for ILC physics
Creators: name: Baer, Howard
name: List, Jenny
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We re-evaluate prospects for supersymmetry at the proposed International Linear e^+e^- Collider (ILC) in light of the first two years of serious data taking at LHC: LHC7 with ~5 fb^{-1} of pp collisions at sqrt{s}=7 TeV and LHC8 with ~20 fb^{-1} at \sqrt{s}=8 TeV. Strong new limits from LHC8 SUSY searches, along with the discovery of a Higgs boson with m_h~125 GeV, suggest a paradigm shift from previously popular models to ones with new and compelling signatures. After a review of the current status of supersymmetry, we present a variety of new ILC benchmark models, including: natural SUSY, radiatively-driven natural SUSY (RNS), NUHM2 with low m_A, a focus point case from mSUGRA/CMSSM, non-universal gaugino mass (NUGM) model, stau-coannihilation, Kallosh-Linde/spread SUSY model, mixed gauge-gravity mediation, normal scalar mass hierarchy (NMH), and one example with the recently discovered Higgs boson being the heavy CP-even state H. While all these models at present elude the latest LHC8 limits, they do offer intriguing case study possibilities for ILC operating at \sqrt{s}~0.25-1 TeV. The benchmark points also present a view of the widely diverse SUSY phenomena which might still be expected in the post LHC8 era at both LHC and ILC.
description: 29 pages with 22 figures. This report is a considerably updated and expanded version of a previous report on post-LHC7 SUSY benchmark models for ILC studies: arXiv:1205.6929
Quantum multi-programming for Grover's search
Creators: name: Park, Gilchan
name: Zhang, Kun
name: Yu, Kwangmin
name: Korepin, Vladimir
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum multi-programming is a method utilizing contemporary noisy intermediate-scale quantum computers by executing multiple quantum circuits concurrently. Despite early research on it, the research remains on quantum gates or small-size quantum algorithms without correlation. In this paper, we propose a quantum multi-programming (QMP) algorithm for Grover's search. Our algorithm decomposes Grover's algorithm by the partial diffusion operator and executes the decomposed circuits in parallel by QMP. We proved that this new algorithm increases the rotation angle of the Grover operator which, as a result, increases the success probability. The new algorithm is implemented on IBM quantum computers and compared with the canonical Grover's algorithm and other variations of Grover's algorithms. The empirical tests validate that our new algorithm outperforms other variations of Grover's algorithms as well as the canonical Grover's algorithm.
Numerically assisted determination of local models in network scenarios
Creators: name: da Silva, José Mário
name: Parisio, Fernando
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Taking advantage of the fact that the cardinalities of hidden variables in network scenarios can be assumed to be finite without loss of generality, a numerical tool for finding explicit local models that reproduce a given statistical behaviour was developed. The numerical procedure was then validated using families of statistical behaviours for which the network-local boundary is known, in the bilocal scenario. Furthermore, the critical visibility for 3 notable distributions mixed with a uniform random noise is investigated in the triangle network without inputs. We provide conjectures for the critical visibilities of the Greenberger-Horne-Zeilinger (GHZ) and W distributions (which are roots of 4th degree polynomials), as well as a lower bound estimate of the critical visibility of the Elegant Joint Measurement distribution. The developed codes and documentation are publicly available at github.com/mariofilho281/localmodels
description: 10 pages and 8 figures. Updated to match the published version
Low Transverse Momentum Heavy Quark Pair Production to Probe Gluon Tomography
Creators: name: Zhu, Ruilin
name: Sun, Peng
name: Yuan, Feng
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive the transverse momentum dependent (TMD) factorization for heavy quark pair production in deep inelastic scattering, where the total transverse momentum is much smaller than the invariant mass of the pair. The factorization is demonstrated at one-loop order, in both Ji-Ma-Yuan and Collins-11 schemes for the TMD definitions, and the hard factors are calculated accordingly. Our result provides a solid theoretical foundation for the phenomenological investigations of the gluon TMDs in this process, and can be extended to other similar hard processes, including dijet (di-hadron) production in DIS.
description: 9 pages, 2 figures
Gravitational-wave event rates as a new probe for dark matter microphysics
Creators: name: Mosbech, Markus R.
name: Jenkins, Alexander C.
name: Bose, Sownak
name: Boehm, Celine
name: Sakellariadou, Mairi
name: Wong, Yvonne Y. Y.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We show that gravitational waves have the potential to unravel the microphysical properties of dark matter due to the dependence of the binary black hole merger rate on cosmic structure formation, which is itself highly dependent on the dark matter scenario. In particular, we demonstrate that suppression of small-scale structure -- such as that caused by interacting, warm, or fuzzy dark matter -- leads to a significant reduction in the rate of binary black hole mergers at redshifts $z\gtrsim5$. This shows that future gravitational-wave observations will provide a new probe of physics beyond the $Λ$CDM model.
description: 15 pages, 12 figures, matches version published in PRD
Unitarity of the SoV Transform for $\mathrm{SL}(2,\mathbb C)$ Spin Chains
Creators: name: Manashov, Alexander N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We prove the unitarity of the separation of variables transform for $\mathrm{SL}(2,\mathbb C)$ spin chains by a method based on the use of Gustafson integrals.