cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Network Behavior in Thin Film Growth Dynamics
Creators: name: Karabacak, Tansel
name: Guclu, Hasan
name: Yuksel, Murat
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We present a new network modeling approach for various thin film growth techniques that incorporates re-emitted particles due to the non-unity sticking coefficients. We model re-emission of a particle from one surface site to another one as a network link, and generate a network model corresponding to the thin film growth. Monte Carlo simulations are used to grow films and dynamically track the trajectories of re-emitted particles. We performed simulations for normal incidence, oblique angle, and chemical vapor deposition (CVD) techniques. Each deposition method leads to a different dynamic evolution of surface morphology due to different sticking coefficients involved and different strength of shadowing effect originating from the obliquely incident particles. Traditional dynamic scaling analysis on surface morphology cannot point to any universal behavior. On the other hand, our detailed network analysis reveals that there exist universal behaviors in degree distributions, weighted average degree versus degree, and distance distributions independent of the sticking coefficient used and sometimes even independent of the growth technique. We also observe that network traffic during high sticking coefficient CVD and oblique angle deposition occurs mainly among edges of the columnar structures formed, while it is more uniform and short-range among hills and valleys of small sticking coefficient CVD and normal angle depositions that produce smoother surfaces.
description: 11 pages, 9 figures, revtex4
Fermion condensation: a strange idea successfully explaining behavior of numerous objects in Nature
Creators: name: Shaginyan, V. R.
name: Amusia, M. Ya.
name: Popov, K. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Strongly correlated Fermi systems are among the most intriguing, best experimentally studied and fundamental systems in physics. These are, however, in defiance of theoretical understanding. The ideas based on the concepts like Kondo lattice and involving quantum and thermal fluctuations at a quantum critical point have been used to explain the unusual physics. Alas, being suggested to describe one property, these approaches fail to explain the others. This means a real crisis in theory suggesting that there is a hidden fundamental law of nature, which remains to be recognized. A theory of fermion condensation quantum phase transition, preserving the extended quasiparticles paradigm and intimately related to unlimited growth of the effective mass as a function of temperature, magnetic field etc, is capable to resolve the problem. We discuss the construction of the theory and show that it delivers theoretical explanations of vast majority of experimental results in strongly correlated systems such as heavy-fermion metals and quasi-two-dimensional Fermi systems.
description: 12 pages, 14 figures, Invited talk at Bogolyubov Kyiv Conference, Modern Problems of Theoretical and Mathematical Physics, 2009, Kyiv, Ukraine
title: Changes in the Market Structure of the Grocery Retailing Industry of Four Selected Utah Retail Selling Areas, 1960-1969
Creators: name: Salsibury, Michael H.
Publisher: name: Utah State University
Year: 1970

description: An analysis of four Utah retail selling areas was made to determine the changes in the market structure of the retail grocery industry of these markets. The study markets were Logan, Ogden, Salt Lake, and Provo-Orem. This study was an ex tension of the National Commission Food Marketing study of the retail food marketing industry.
The major changes observed in the study markets were increasing population, dollar food sales, supermarket saturation levels and concentration ratios. The number of retail food outlets was decreasing. The barriers to entry in the study markets increased during the study period.
There was substantial economic activity in the study markets during the study period. Several major chain food retailers entered and left the markets during the study period. Firm expansion in the retail grocery industry was accomplished by both external means and internal means.
Resolved stellar population properties of PHANGS-MUSE galaxies
Creators: name: Pessa, I.
name: Schinnerer, E.
name: Sanchez-Blazquez, P.
name: Belfiore, F.
name: Groves, B.
name: Emsellem, E.
name: Neumann, J.
name: Leroy, A. K.
name: Bigiel, F.
name: Chevance, M.
name: Dale, D. A.
name: Glover, S. C. O.
name: Grasha, K.
name: Klessen, R. S.
name: Kreckel, K.
name: Kruijssen, J. M. D.
name: Pinna, F.
name: Querejeta, M.
name: Rosolowsky, E.
name: Williams, T. G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Analyzing resolved stellar populations across the disk of a galaxy can provide unique insights into how that galaxy assembled its stellar mass over its lifetime. Previous work at ~1 kpc resolution has already revealed common features in the mass buildup (e.g., inside-out growth of galaxies). However, even at approximate kpc scales, the stellar populations are blurred between the different galactic morphological structures such as spiral arms, bars and bulges. Here we present a detailed analysis of the spatially resolved star formation histories (SFHs) of 19 PHANGS-MUSE galaxies, at a spatial resolution of ~100 pc. We show that our sample of local galaxies exhibits predominantly negative radial gradients of stellar age and [Z/H], consistent with previous findings, and a radial structure that is primarily consistent with local star formation, and indicative of inside-out formation. In barred galaxies, we find flatter [Z/H] gradients along the semi-major axis of the bar than along the semi-minor axis, as is expected from the radial mixing of material along the bar. In general, the derived assembly histories of the galaxies in our sample tell a consistent story of inside-out growth, where low-mass galaxies assembled the majority of their stellar mass later in cosmic history than high-mass galaxies. We also show how stellar populations of different ages exhibit different kinematics, with younger stellar populations having lower velocity dispersions than older stellar populations at similar galactocentric distances, which we interpret as an imprint of the progressive dynamical heating of stellar populations as they age. Finally, we explore how the time-averaged star formation rate evolves with time, and how it varies across galactic disks. This analysis reveals a wide variation of the SFHs of galaxy centers and additionally shows that structural features become less pronounced with age.
description: 52 pages, 48 figures, accepted for publication in A&A
Noisy monitored quantum dynamics of ergodic multi-qubit systems
Creators: name: Schomerus, Henning
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: I employ random-matrix methods to set up and solve statistical models of noisy nonunitary dynamics that appear in the context of monitored quantum systems. The models cover a range of scenarios combining random dynamics and measurements of variable strength of one or several qubits. The combined dynamics drive the system into states whose statistics reflect the competition of randomizing unitary evolution and the measurement-induced backaction collapsing the state. These effects are mediated by entanglement, as I describe in detail by analytical results. For the paradigmatic case of monitoring via a single designated qubit, this reveals a simple statistical mechanism, in which the monitoring conditions the state of the monitored qubit, which then imposes statistical constraints on the remaining quantities of the system. For the case of monitoring several qubits with prescribed strength, the developed formalism allows one to set up the statistical description and solve it numerically. Finally, I also compare the analytical results to the monitored dynamics of a quantum kicked top, revealing two regimes where the statistical model either describes the full stationary dynamics, or resolves time scales during particular parts of the evolution.
description: 15 pages, Special Issue 'Advances in Quantum Chaos, Random-Matrix Theory and the Semiclassical Limit: in memory of Fritz Haake' of J. Phys. A
title: Estimated Response of Sugar Beet Production to Possible Changes in Relative Profitability, Utah, 1969
Creators: name: Allred, Darwin C.
Publisher: name: Utah State University
Year: 1970

description: This study was designed to determine the relative profitability of sugar beet production relative to other enterprises competing with sugar beets for limited resources and to estimate a production response of sugar beet growers in the beet producing areas of Utah.
Sugar beet producing areas in Utah were delineated. Representative farm units for beef-crop, dairy-crop, and all- crop farms were synthesized. Enterprise budgets were formulated and analysed to ascertain the relative profitableness of sugar beets compared to competing enterprises in each production area.
Linear programming was used to develop the supply response portion of this study. An aggregated supply curve was derived showing the acreage response of sugar beet producers at varying sugar beet prices. Rotation for nematode control restricted annual sugar beet production to 25 percent of available sugar beet land. The price range over which it would be profitable to include sugar beets in the optimum combinations was $9.98 per ton to $14.19 per ton.
Ultrafast dynamics of optically excited charge carriers in the room-temperature antiferromagnetic semiconductor $α$-MnTe
Creators: name: Zhu, Changqing
name: Pilch, Patrick
name: Reinold, Anneke
name: Kudlacik, Dennis
name: Springholz, Gunther
name: Bonanni, Alberta
name: Assmann, Marc
name: Cinchetti, Mirko
name: Wang, Zhe
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on time-resolved optical and terahertz ultrafast spectroscopy of charge-carrier dynamics in the room-temperature antiferromagnetic semiconductor $α$-MnTe. By optically pumping the system with 1.55 eV photons at room temperature, we excite charge carriers in the conduction band through the indirect band gap and investigate the dynamical response of nonequilibrium states using optical as well as terahertz transmission probes. Three relaxation processes are revealed by their characteristic relaxation times of the order of 1, 10, and 100~ps, whose exact values are functions of the pump fluence. For high pump fluences nonlinear dependence on the pump fluence is observed both in the optical and terahertz probes.
35 aastat koronaarangioplastika kasutuselevõtust maailmas ja 30 aastat Eestis
Creators: name: Eha, Jaan
Publisher: name: OÜ Celsius Healthcare
Year: 2012

description: Eesti Arst 2012; 91(11):625–628
description: Eesti Arst, Detsember 2012
The signature of dark energy perturbations in galaxy cluster surveys
Creators: name: Abramo, L. Raul
name: Batista, Ronaldo C.
name: Rosenfeld, Rogerio
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: All models of dynamical dark energy possess fluctuations, which affect the number of galaxy clusters in the Universe. We have studied the impact of dark energy clustering on the number of clusters using a generalization of the spherical collapse model and the Press-Schechter formalism. Our statistical analysis is performed in a 7-parameter space using the Fisher matrix method, for several hypothetical Sunyaev-Zel'dovich and weak lensing (shear maps) surveys. In some scenarios, the impact of these fluctuations is large enough that their effect could already be detected by existing instruments such as the South Pole Telescope, when its data is combined with WMAP and SDSS. Future observations could go much further and probe the nature of dark energy by distinguishing between different models on the basis of their perturbations, not only their expansion histories.
description: 5 pages, 4 figures
Additional file 7 of Cis-acting lnc-eRNA SEELA directly binds histone H4 to promote histone recognition and leukemia progression
Creators: name: Fang, Ke
name: Huang, Wei
name: Sun, Yu-Meng
name: Chen, Tian-Qi
name: Zeng, Zhan-Cheng
name: Yang, Qian-Qian
name: Pan, Qi
name: Han, Cai
name: Sun, Lin-Yu
name: Luo, Xue-Qun
name: Wang, Wen-Tao
name: Chen, Yue-Qin
Publisher: name: figshare
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 7. Antibodies used in the research.
The Invisible Dilaton
Creators: name: Brax, Philippe
name: Burrage, Clare
name: Cembranos, Jose A. R.
name: Valageas, Patrick
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We analyse the dynamics of a light scalar field responsible for the $μ$ term of the Higgs potential and coupled to matter via the Higgs-portal mechanism. We find that this dilaton model is stable under radiative corrections induced by the standard model particle masses. When the background value of the scalar field is stabilised at the minimum of the scalar potential, the scalar field fluctuations only couple quadratically to the massive fields of the standard model preventing the scalar direct decay into standard model particles. Cosmologically and prior to the electroweak symmetry breaking, the scalar field rolls down along its effective potential before eventually oscillating and settling down at the electroweak minimum. These oscillations can be at the origin of dark matter due to the initial misalignment of the scalar field compared to the electroweak minimum, and we find that, when the mass of the scalar field is less than the eV scale and acts as a condensate behaving like dark matter on large scales, the scalar particles cannot thermalise with the standard model thermal bath. As matter couples in a composition-dependent manner to the oscillating scalar, this could lead to a violation of the equivalence principle aboard satellites such as the MICROSCOPE experiment and the next generation of tests of the equivalence principle. Local gravitational tests are evaded thanks to the weakness of the quadratic coupling in the dark matter halo, and we find that, around other sources, these dilaton models could be subject to a screening akin to the symmetron mechanism.
description: 36 pages, 3 figures
Universal gravothermal evolution of isolated self-interacting dark matter halos for velocity-dependent cross sections
Creators: name: Outmezguine, Nadav Joseph
name: Boddy, Kimberly K.
name: Gad-Nasr, Sophia
name: Kaplinghat, Manoj
name: Sagunski, Laura
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the evolution of isolated self-interacting dark matter (SIDM) halos using spherically-symmetric gravothermal equations allowing for the scattering cross section to be velocity dependent. We focus our attention on the large class of models where the core is in the long mean free path regime for a substantial time. We find that the temporal evolution exhibits an approximate universality that allows velocity-dependent models to be mapped onto velocity-independent models in a well-defined way using the scattering timescale computed when the halo achieves its minimum central density. We show how this timescale depends on the halo parameters and an average cross section computed at the central velocity dispersion when the central density is minimum. The predicted collapse time is fully defined by the scattering timescale, with negligible variation due to the velocity dependence of the cross section. We derive new self-similar solutions that provide an analytic understanding of the numerical results.
description: Matched to the published version
title: Hereford and Holstein Steer Performance on High Grain Diets With and Without Corn Silage
Creators: name: Russell, Cyril Bruce
Publisher: name: Utah State University
Year: 1970

description: A factorially designed experiment had 18 Hereford and 18 Holstein steers on individually fed, high-grain diets. One diet included 59% rolled barley, 30% CSF beet pulp, 5% protein, vitamin, mineral, and stilbestrol supplement, and 6% chopped hay and straw. The other diet had corn silage (11% air dry matter equivalent) substituted for the chopped roughage and 5% of the beet pulp. The Holsteins were heavier at the start, 752 lb. as compared to the Herefords 686 lb. average. The weight differential was maintained throughout the approximately 180-day trial. The Holstein's feed consumption and rate of gain, 23.4 and 2.71 lb. respectively, were significantly better than the hereford's 20.1 and 2.23 lb. The average feed conversion difference was not significant, with 8.68 for the Holsteins and 9.20 for the Herefords. There was no significant difference in carcass grade, although the Herefords tended to grade higher and had significantly better conformation scores. The Holsteins had less fat cover, .178 inches as compared to .497 inches, and a significantly higher cutability, with 52% for the Holsteins vs. 50% for the Herefords. Feed conversion was 8.57 for the cattle on the diet containing silage and 9.30 for those on the diet without silage (P
Where the orders are: original poems
Creators: name: Dawson, David Anthony
Publisher: name: University of British Columbia
Year: 2011

description: despite personal & general chaos there is order, where values, intentions, and conditions lack order, (such is the 'human condition’), order is everywhere evident in the physical world. & here is the connection man seeks to make: to relate to the larger order—for he is part of that larger physical order. count by numbers, measure—as all the universe does of itself—ritual order in all things. to wit: the language can only take us so far. it does not admit to such clear order, so how can it render such order, nevermind try to impose it. the poem seeks the orders, and the connections, they are real and to be found. what the poem ultimately does is point—indicate where the orders are. (to which we do adhere, in spite of ourselves—else we are not part of the physical world around us.) but there is a pun in all this. orders. as in holy orders, a ritual to be discharged in the service of. in no way does the poet make or impose. he discovers and reveals, such is the function implicit in his ordination.
Topology of the polarization field in ferroelectric nanowires from first principles
Creators: name: Hong, J. W.
name: Catalan, G.
name: Fang, D. N.
name: Artacho, Emilio
name: Scott, J. F.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The behaviour of the cross-sectional polarization field is explored for thin nanowires of barium titanate from first-principles calculations. Topological defects of different winding numbers have been obtained, beyond the known textures in ferroelectric nanostructures. They result from the inward accommodation of the polarization patterns imposed at the surface of the wire by surface and edge effects. Close to a topological defect the polarization field orients out of the basal plane in some cases, maintaining a close to constant magnitude, whereas it virtually vanishes in other cases.
description: 4 pages, 3 figures
Innovation and Global Issues 1: Extended Abstracts Book
Creators: name: Bilici, Nurettin
name: Pehlivanlı, Ragıp
name: Demirkılınç, Selçuk
Publisher: name: figshare
Year: 2021
Subjects: subject: 130205 Humanities and Social Sciences Curriculum and Pedagogy (excl. Economics, Business and Management)
subject: FOS: Educational sciences
subject: 190301 Journalism Studies
subject: FOS: Media and communications
subject: 190205 Interactive Media
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 190502 Fine Arts (incl. Sculpture and Painting)
subject: Art
subject: 180104 Civil Law and Procedure
subject: FOS: Law
subject: 180108 Constitutional Law
subject: 130203 Economics, Business and Management Curriculum and Pedagogy
subject: 130303 Education Assessment and Evaluation
subject: 220304 Epistemology
subject: FOS: Philosophy, ethics and religion
subject: Law
subject: Literature
subject: 150603 Tourism Management
subject: FOS: Economics and business
subject: 140216 Tourism Economics
subject: 150606 Tourist Behaviour and Visitor Experience
subject: 150604 Tourism Marketing
subject: 160513 Tourism Policy
subject: FOS: Political science
subject: 160509 Public Administration
subject: 150301 Business Information Management (incl. Records, Knowledge and Information Management, and Intelligence)
subject: 140210 International Economics and International Finance
subject: 150201 Finance

description: It is a valuable academic work that contains extended abstracts of the academic studies presented within the scope of Innovation and Global Issues Congress I in Patara Antique city and includes multidisciplinary studies.
Turkish
Innovation and Global Issues Congress I kapsamında sunulan akademik çalışmaların geniş özet metinlerinin bulunduğu, multidisipliner çalışmalar içeren değerli akademik bir eserdir.
Testing Model Predictions of Depth of Air-Shower Maximum and Signals in Surface Detectors using Hybrid Data of the Pierre Auger Observatory
Creators: name: Vícha, Jakub
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a method for testing the predictions of hadronic interaction models and improving their consistency with observed two-dimensional distributions of the depth of shower maximum, $X_\text{max}$, and signal at the ground level as a function of zenith angle. The method relies on the assumption that the mass composition is the same at all zenith angles, while the atmospheric shower development and attenuation depend on composition in a correlated way. In the present work, for each of the three leading LHC-tuned hadronic interaction models, we allow a global shift $ΔX_\text{max}$ of the predicted shower maximum, which is the same for every mass and energy, and a rescaling $R_\text{Had}$ of the hadronic component at the ground level which is constant with the zenith angle. We apply the analysis to 2297 events reconstructed with both the fluorescence and surface detectors of the Pierre Auger Observatory with energies $10^{18.5-19.0}$ eV and zenith angles below 60$^\circ$. Given the modeling assumptions made in this analysis, the best fit reaches its optimum value when shifting the $X_\text{max}$ predictions of hadronic interaction models to deeper values and increasing the hadronic signal. This change in the predicted $X_\text{max}$ scale alleviates the previously identified model deficit in the hadronic signal (commonly called the muon puzzle) but does not fully remove it. Because of the size of the adjustments $ΔX_\text{max}$ and $R_\text{Had}$ and the large number of events in the sample, the statistical significance of need for these adjustments is large, greater than 5$σ_\text{stat}$, even for the combination of the systematic experimental shifts within 1$σ_\text{sys}$ that are the most favorable for the models.
description: Proceedings of the 6th International Symposium on Ultra High Energy Cosmic Rays (UHECR 2022), Oct 3-7, 2022, Gran Sasso Science Institute, L'Aquila, Italy. Accepted for publications in EPJ Web of Conferences series
title: Seed Response Under Snow on a Subalpine Range in Central Utah
Creators: name: Bleak, Alvin T.
Publisher: name: Utah State University
Year: 1970

description: The response of grass, forb, and shrub seeds to the subalpine environment during the fall and under winter snow and under laboratory conditions at 20/28 C was observed for 3 consecutive years at an elevation of about 3000m on the Wasatch Plateau in central Utah.
Seeds in nylon sleeves were planted under 2 cm of soil before snowfall. Under snow plantings were made directly on the soil surface and under 2 cm of soil. The seeds planted before snowfall were removed each year on four occasions: when under snow plantings were made, after snow depth exceeded 130 cm (deep snow), just before spring snowmelt, and 10 or more days following snowmelt when soils had warmed. Seeds planted under snow or under snow and soil were removed on two occasions: after snow depth exceeded 130 cm and just before the snow melted in the spring.
Environmental conditions which produced seed germination varied with species, origin of species, age of seed, and temperature. Fifty-four of the 60 species planted in September under 2 cm of soil before snowfall had some seed germinated when examined just before the snow melted in the spring. Fifty of the same species planted after winter snow covered the ground in November also had some seed germination just before the snow melted in the spring. Seed germination at the near 0 C temperatures on the soil surface under snow was usually similar to the comparable seed lots also placed under 2 cm of soil.
Germinability of the grasses, forbs, and shrubs studied was placed in three broad classifications: (1) Little or no seed dormancy with germination at low and warm temperatures. Seeds germinated soon after harvest at temperatures near 0 C and also in the laboratory at 20/28 C. Examples are Agropyron desertorum, A. intermedium, Chrysothamnus viscidiflorus, and Lupinus alpestris. (2) Little or no seed dormancy with germination only at warm temperatures. Seeds did not germinate at the low temperatures present in the subalpine zone during the fall and winter but germinated readily in the laboratory at 20/28 C. Examples are Aquilegia caerulea , Potentilla gracilis var. pulcherrima, Rudbeckia occidentalis, and Valeriana edulis. (3) Dormancy at seed harvest. Germination was usually increased by near 0 C temperatures, by aging, and by other environmental conditions present under deep snow. Examples are Agropyron trachycaulum, Delphinium barbeyi, Madia glomerata, and Ribes cereum var. inebrians.
The Bold-Thin-Bold Diagrammatic Monte Carlo Method for Open Quantum Systems
Creators: name: Cai, Zhenning
name: Wang, Geshuo
name: Yang, Siyao
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present two diagrammatic Monte Carlo methods for quantum systems coupled with harmonic baths, whose dynamics are described by integro-differential equations. The first approach can be considered as a reformulation of Dyson series, and the second one, called "bold-thin-bold diagrammatic Monte Carlo", is based on resummation of the diagrams in the Dyson series to accelerate its convergence. The underlying mechanism of the governing equations associated with the two methods lies in the recurrence relation of the path integrals, which is the most costly part in the numerical methods. The proposed algorithms give an extension to the work ["Fast algorithms of bath calculations in simulations of quantum system-bath dynamics", Computer Physics Communications, to appear], where the algorithms are designed based on reusing the previous calculations of bath influence functionals. Compared with the algorithms therein, our methods further include the reuse of system associated functionals and show better performance in terms of computational efficiency and memory cost. We demonstrate the two methods in the framework of spin-boson model, and numerical experiments are carried out to verify the validity of the methods.
Contactium: A strongly correlated model system
Creators: name: Cioslowski, Jerzy
name: Englert, Berthold-Georg
name: Trappe, Martin-Isbjörn
name: Hue, Jun Hao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: At the limit of an infinite confinement strength $ω$, the ground state of a system that comprises two fermions or bosons in a harmonic confinement interacting through the Fermi--Huang pseudopotential remains strongly correlated. A detailed analysis of the one-particle description of this ``contactium'' reveals several peculiarities that are not encountered in conventional model systems (such as the two-electron harmonium atom, ballium, and spherium) involving Coulombic interparticle interactions. First of all, none of the natural orbitals (NOs) $\{ ψ_\mathfrak{n}(ω;\vec r) \}$ of the contactium is unoccupied, which implies nonzero collective occupancies for all the angular momenta. Second, the NOs and their nonascendingly ordered occupation numbers $\{ ν_\mathfrak{n} \}$ turn out to be related to the eigenfunctions and eigenvalues of a zero-energy Schrödinger equation with an attractive Gaussian potential. This observation enables the derivation of their properties such as the $\mathfrak{n}^{-4/3}$ asymptotic decay of $ν_\mathfrak{n}$ at the $\mathfrak{n} \to \infty$ limit (which differs from that of $\mathfrak{n}^{-8/3}$ in the Coulombic systems), the independence of the confinement energy ${v_\mathfrak{n} = \langle ψ_\mathfrak{n}(ω;\vec r) | \frac{1}{2} % ω^2r^2 | ψ_\mathfrak{n}(ω;\vec r) \rangle}$ of $\mathfrak{n}$, and the $\mathfrak{n}^{-2/3}$ asymptotic decay of the respective contribution $ν_\mathfrak{n}t_\mathfrak{n}$ to the kinetic energy. Upon suitable scaling, the weakly occupied NOs of the contactium turn out to be virtually identical with those of the two-electron harmonium atom at the ${ω\to \infty}$ limit, despite the entirely different interparticle interactions in these systems.
description: 9 pages, 5 figures, 1 table
Electromagnetic Form Factors of Hadrons in Dual-Large $N_c$ QCD
Creators: name: Dominguez, C. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this talk, results are presented of determinations of electromagnetic form factors of hadrons (pion, proton, and $Δ(1236)$) in the framework of Dual-Large $N_c$ QCD (Dual-$QCD_\infty$). This framework improves considerably tree-level VMD results by incorporating an infinite number of zero-width resonances, with masses and couplings fixed by the dual-resonance (Veneziano-type) model.
description: Invited talk at the XII Mexican Workshop on Particles & Fields, Mazatlan, November 2009. To be published in American Institute of Physics Conference Proceedings Series
Discovery of a Single-Band Mott Insulator in a van der Waals Flat-Band Compound
Creators: name: Gao, Shunye
name: Zhang, Shuai
name: Wang, Cuixiang
name: Yan, Shaohua
name: Han, Xin
name: Ji, Xuecong
name: Tao, Wei
name: Liu, Jingtong
name: Wang, Tiantian
name: Yuan, Shuaikang
name: Qu, Gexing
name: Chen, Ziyan
name: Zhang, Yongzhao
name: Huang, Jierui
name: Pan, Mojun
name: Peng, Shiyu
name: Hu, Yong
name: Li, Hang
name: Huang, Yaobo
name: Zhou, Hui
name: Meng, Sheng
name: Yang, Liu
name: Wang, Zhiwei
name: Yao, Yugui
name: Chen, Zhiguo
name: Shi, Ming
name: Ding, Hong
name: Yang, Huaixin
name: Jiang, Kun
name: Li, Yunliang
name: Lei, Hechang
name: Shi, Youguo
name: Weng, Hongming
name: Qian, Tian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The Mott insulator provides an excellent foundation for exploring a wide range of strongly correlated physical phenomena, such as high-temperature superconductivity, quantum spin liquid, and colossal magnetoresistance. A Mott insulator with the simplest degree of freedom is an ideal and highly desirable system for studying the fundamental physics of Mottness. In this study, we have unambiguously identified such an anticipated Mott insulator in a van der Waals layered compound Nb3Cl8. In the high-temperature phase, where interlayer coupling is negligible, density functional theory calculations for the monolayer of Nb3Cl8 suggest a half-filled flat band at the Fermi level, whereas angle-resolved photoemission spectroscopy experiments observe a large gap. This observation is perfectly reproduced by dynamical mean-field theory calculations considering strong electron correlations, indicating a correlation-driven Mott insulator state. Since this half-filled band derived from a single 2a1 orbital is isolated from all other bands, the monolayer of Nb3Cl8 is an ideal realization of the celebrated single-band Hubbard model. Upon decreasing the temperature, the bulk system undergoes a phase transition, where structural changes significantly enhance the interlayer coupling. This results in a bonding-antibonding splitting in the Hubbard bands, while the Mott gap remains dominant. Our discovery provides a simple and seminal model system for investigating Mott physics and other emerging correlated states.
description: 23 pages, 4 figures, and the Supplemental Material
Gaussian phase-space representation of Fermion dynamics; Beyond the time-dependent-Hartree-Fock approximation
Creators: name: Rahav, Saar
name: Mukamel, Shaul
Publisher: name: arXiv
Year: 2009
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A Gaussian operator representation for the many body density matrix of fermionic systems, developed by Corney and Drummond [Phys. Rev. Lett, v93, 260401 (2004)], is used to derive approximate decoupling schemes for their dynamics. In this approach the reduced single electron density matrix elements serve as stochastic variables which satisfy an exact Fokker-Planck equation. The number of variables scales as ~N^2 rather than ~exp(N) with the basis set size, and the time dependent Hartree Fock approximation (TDHF) is recovered in the "classical" limit. An approximate closed set of equations of motion for the one and two-particle reduced density matrices, provides a direct generalization of the TDHF.
description: 12 pages. Minor revision, reference added
Numerical simulations of prominence oscillations triggered by external perturbations
Creators: name: Liakh, Valeriia
name: Luna, Manuel
name: Khomenko, Elena
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Several energetic disturbances have been identified as triggers of the large-amplitude oscillations (LAOs) in prominences. However, the mechanisms for LAOs excitation are not well understood. We aim to study these mechanisms, performing time-dependent numerical simulations in 2.5D and 2D setups using magnetohydrodynamic (MHD) code MANCHA3D. Two types of disturbances are applied to excite prominence oscillations, such as a perturbation associated with an eruption and the waves caused by an artificial energy release. In the simulation with the eruption, we obtain that it does not produce LAOs in the prominence located in its vicinity. While the erupting flux rope rises, an elongated current sheet forms behind it, which becomes unstable and breaks into plasmoids. The downward-moving plasmoids cause perturbations in the velocity field by merging with the post-reconnection loops. This velocity perturbation propagates in the surroundings and perturbs the nearby prominence. The analysis of the oscillatory motions of the prominence plasma reveals the excitation of small-amplitude oscillations (SAOs), which are a mixture of longitudinal and vertical oscillations. In the simulation with a distant artificial perturbation, a fast-mode shock wave is produced, and it gradually reaches two flux rope prominences at different distances. This shock wave excites vertical LAOs and longitudinal SAOs with similar amplitudes, periods, and damping times in both prominences. Finally, in the experiment with the external triggering of LAOs in a dipped arcade prominence model, we find that, although the vector normal to the front of a fast-mode shock wave is parallel to the spine of the dipped arcade well before the contact, this wave does not excite longitudinal LAOs. When the wave front approaches the prominence, it pushes the dense plasma down, establishing vertical LAOs.
description: 18 pages, 18 figures, accepted for publication in Astronomy and Astrophysics
Pion-nucleon scattering around the delta resonance
Creators: name: Long, Bingwei
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We develop a generalized version of heavy-baryon chiral perturbation theory to describe pion-nucleon scattering in a kinematic domain that extends continuously from threshold to the delta-isobar peak. The $P$-wave phase shifts are used to illustrate this framework.
description: Talk given at Chiral Dynamics 2009, 8 pages and 4 figures
Adding alchemical variables to metadynamics to enhance sampling in free energy calculations
Creators: name: Hsu, Wei-Tse
name: Piomponi, Valerio
name: Merz, Pascal T.
name: Bussi, Giovanni
name: Shirts, Michael R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Performing alchemical transformations, in which one molecular system is nonphysically changed to another system, is a popular approach adopted in performing free energy calculations associated with various biophysical processes, such as protein-ligand binding or the transfer of a molecule between environments. While the sampling of alchemical intermediate states in either parallel (e.g. Hamiltonian replica exchange) or serial manner (e.g. expanded ensemble) can bridge the high-probability regions in the configurational space between two end states of interest, alchemical methods can fail in scenarios where the most important slow degrees of freedom in the configurational space are in large part orthogonal to the alchemical variable, or if the system gets trapped in a deep basin extending in both the configurational and alchemical space.
 To alleviate these issues, we propose to use alchemical variables as an additional dimension in metadynamics, augmenting the ability both to sample collective variables and to enhance sampling in free energy calculations. In this study, we validate our implementation of alchemical metadynamics in PLUMED with test systems and alchemical processes with varying complexities and dimensions of collective variable space, including the interconversion between the torsional metastable states of a toy system and the methylation of a nucleoside both in the isolated form and in a duplex. We show that multi-dimensional alchemical metadynamics can address the challenges mentioned above and further accelerate sampling by introducing configurational collective variables. The method can trivially be combined with other metadynamics-based algorithms implemented in PLUMED. The necessary PLUMED code changes have already been released for general use in PLUMED 2.8.
The teleparallel complex
Creators: name: Cederwall, Martin
name: Palmkvist, Jakob
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We formalise the teleparallel version of extended geometry (including gravity) by the introduction of a complex, the differential of which provides the linearised dynamics. The main point is the natural replacement of the two-derivative equations of motion by a differential which only contains terms of order 0 and 1 in derivatives. Second derivatives arise from homotopy transfer (elimination of fields with algebraic equations of motion). The formalism has the advantage of providing a clear consistency relation for the algebraic part of the differential, the "dualisation", which then defines the dynamics of physical fields. It remains unmodified in the interacting BV theory, and the full non-linear models arise from covariantisation. A consequence of the use of the complex is that symmetry under local rotations becomes as good as manifest, instead of arising for a specific combination of tensorial terms, for less obvious reasons. We illustrate with a derivation of teleparallel Ehlers geometry, where the extended coordinate module is the adjoint module of a finite-dimensional simple Lie group.
description: 27 pp
A Study of Modified Characteristics of Hadronic Interactions
Creators: name: Blazek, Jiri
name: Ebr, Jan
name: Vicha, Jakub
name: Pierog, Tanguy
name: Travnicek, Petr
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We have implemented ad-hoc modifications to the CORSIKA Monte-Carlo generator which allow us to simultaneously adjust the multiplicity, elasticity and cross-section of hadronic interactions with respect to the predictions of the Sibyll 2.3d interaction model, in order to assess whether a reasonable combination of changes (that is not excluded by current experimental data) could alleviate the observed tension between the model predictions and observed features of extensive air showers induced by ultra-high energy cosmic rays (UHECR). Previously, we have studied the effects of such changes on proton-initiated showers. Because a multitude of experimental data suggest that the primary composition of the UHECR is mixed, we have expanded the modification procedure to include nuclear projectiles in a consistent way based on the superposition model, in a similar manner as was used in the previous studies carried out using one-dimensional simulation methods. As we are using a fully three-dimensional approach, we can quantify the effects of the changes on both longitudinal and lateral features of the showers. With the inclusion of nuclear projectiles, we can study the impact of the changes on observable quantities for realistic primary beams as well as on the determination of the primary composition from data under the assumption of the modified hadronic interactions.
description: 6 pages, 9 figures, a conference proceeding for UHECR2022
Analyse de la rigidité des machines outils 3 axes d'architecture parallèle hyperstatique
Creators: name: Pashkevich, Anatoly
name: Chablat, Damien
name: Wenger, Philippe
Publisher: name: arXiv
Year: 2008
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The paper presents a new stiffness modelling method for overconstrained parallel manipulators, which is applied to 3-d.o.f. translational mechanisms. It is based on a multidimensional lumped-parameter model that replaces the link flexibility by localized 6-d.o.f. virtual springs. In contrast to other works, the method includes a FEA-based link stiffness evaluation and employs a new solution strategy of the kinetostatic equations, which allows computing the stiffness matrix for the overconstrained architectures and for the singular manipulator postures. The advantages of the developed technique are confirmed by application examples, which deal with comparative stiffness analysis of two translational parallel manipulators.
Spatially tunable spin interactions in neutral atom arrays
Creators: name: Steinert, Lea-Marina
name: Osterholz, Philip
name: Eberhard, Robin
name: Festa, Lorenzo
name: Lorenz, Nikolaus
name: Chen, Zaijun
name: Trautmann, Arno
name: Gross, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Analog quantum simulations with Rydberg atoms in optical tweezers routinely address strongly correlated many-body problems due to the hardware-efficient implementation of the Hamiltonian. Yet, their generality is limited, and flexible Hamiltonian-design techniques are needed to widen the scope of these simulators. Here we report on the realization of spatially tunable interactions for XYZ models implemented by two-color near-resonant coupling to Rydberg pair states. Our results demonstrate the unique opportunities of Rydberg dressing for Hamiltonian design in analog quantum simulators.
Hidden-charm Hexaquarks from Lattice QCD
Creators: name: Liu, Hang
name: He, Jinchen
name: Liu, Liuming
name: Sun, Peng
name: Wang, Wei
name: Yang, Yi-Bo
name: Zhang, Qi-An
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a lattice QCD study of hidden-charm hexaquarks with quark content $usc\bar{d}\bar{s}\bar{c}$ based on four ensembles of gauge configurations generated by CLQCD Collaboration with pion mass in the range of 220-300MeV. Four operators with quantum numbers $0^{++}, 0^{-+}, 1^{++}$ and $1^{--}$ respectively are constructed to interpolate the hexaquarks. After validating the spectrum and the dispersion relation for ordinary hadrons, we calculate the masses of the hexaquarks and extrapolate the results to the physical pion mass and the continuum limit. We find that the masses of the four hexaquarks are all below the $Ξ_c \bar Ξ_c$ threshold, while the $0^{-+}$ hexaquark lies around the $η_c K^+K^-$ threshold. These results will be helpful for experimental searches in future and for a deep understanding of the nature of multiquark states.
description: 7 pages, 6 figures