cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks
Creators: name: Yin, Pei-Lin
name: Cui, Zhu-Fang
name: Roberts, Craig D.
name: Segovia, Jorge
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A symmetry-preserving treatment of a vector$\times$vector contact interaction is used to compute spectra of ground-state $J^P = 0^\pm, 1^\pm$ $(f\bar g)$ mesons, their partner diquark correlations, and $J^P=1/2^\pm, 3/2^\pm$ $(fgh)$ baryons, where $f,g,h \in \{u,d,s,c,b\}$. Results for the leptonic decay constants of all mesons are also obtained, including scalar and pseudovector states involving heavy quarks. The spectrum of baryons produced by this chiefly algebraic approach reproduces the 64 masses known empirically or computed using lattice-regularised quantum chromodynamics with an accuracy of 1.4(1.2)%. It also has the richness of states typical of constituent-quark models and predicts many baryon states that have not yet been observed. The study indicates that dynamical, nonpointlike diquark correlations play an important role in all baryons; and, typically, the lightest allowed diquark is the most important component of a baryon's Faddeev amplitude.
description: 21 pages, 7 tables, 5 figures. arXiv admin note: text overlap with arXiv:1903.00160
Full optimization of Jastrow-Slater wave functions with application to the first-row atoms and homonuclear diatomic molecules
Creators: name: Toulouse, Julien
name: Umrigar, C. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We pursue the development and application of the recently-introduced linear optimization method for determining the optimal linear and nonlinear parameters of Jastrow-Slater wave functions in a variational Monte Carlo framework. In this approach, the optimal parameters are found iteratively by diagonalizing the Hamiltonian matrix in the space spanned by the wave function and its first-order derivatives, making use of a strong zero-variance principle. We extend the method to optimize the exponents of the basis functions, simultaneously with all the other parameters, namely the Jastrow, configuration state function and orbital parameters. We show that the linear optimization method can be thought of as a so-called augmented Hessian approach, which helps explain the robustness of the method and permits us to extend it to minimize a linear combination of the energy and the energy variance. We apply the linear optimization method to obtain the complete ground-state potential energy curve of the C_2 molecule up to the dissociation limit, and discuss size consistency and broken spin-symmetry issues in quantum Monte Carlo calculations. We perform calculations of the first-row atoms and homonuclear diatomic molecules with fully optimized Jastrow-Slater wave functions, and we demonstrate that molecular well depths can be obtained with near chemical accuracy quite systematically at the diffusion Monte Carlo level for these systems.
description: 15 pages, 3 figures, to appear in Journal of Chemical Physics
Primordial Perturbations Spectra in a Holographic Phase
Creators: name: Piao, Yun-Song
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper, we suppose that the universe begins in a holographic thermal equilibrium phase with the diverged correlation length, and the phase transition to the radiation phase of standard cosmology goes with the abrupt reducing of correlation length. In this case, the primordial perturbations may be induced by thermal fluctuations in this holographic phase. We calculate the spectra of this holographic primordial perturbations, and find that the scalar spectrum has a slightly red tilt and the tensor perturbation amplitude has a moderate ratio, which may be tested in coming observations. The results plotted in r-n_s plane is similar to that of large field inflation models. However, for fixed efolding number, they are generally in different positions.
description: 5 pages, 3 eps figures, to be published in PRD
Motion of nanodroplets near edges and wedges
Creators: name: Moosavi, A.
name: Rauscher, M.
name: Dietrich, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Nanodroplets residing near wedges or edges of solid substrates exhibit a disjoining pressure induced dynamics. Our nanoscale hydrodynamic calculations reveal that non-volatile droplets are attracted or repelled from edges or wedges depending on details of the corresponding laterally varying disjoining pressure generated, e.g., by a possible surface coating.
description: 12 pages, 7 figures
Rotation and flares of M dwarfs with habitable zones accessible to TESS
Creators: name: Bogner, Mirjam
name: Stelzer, Beate
name: Raetz, Stefanie
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence
TESS
M dwarfs
flares

description: We present an analysis of starspot modulation and flares in the TESS lightcurves of 112 M dwarfs with a TESS magnitude \(\leq 11.5\) that are listed in the TESS Habitable Zone Star Catalog (HZCat, Kaltenegger et al. 2019). Our sample is of particular interest since it comprises stars in the HZCat with sufficiently long TESS observation times for planets to be detected in the entire habitable zone. Understanding the magnetic activity of such stars is crucial for exoplanet characterization since an active, flaring host star might influence the planet’s habitability. We detected more than 2000 flares in this sample and we discuss the relation of flares with spectral type and rotation period. We also present flare frequency distributions (FFDs) and the flux reaching the habitable zone during flare events.
description: {"references": ["Stelzer, Beate et al. (2016). A path towards understanding the rotation-activity relation of M dwarfs with K2 mission, X-ray and UV data.", "Raetz, Stefanie et al. (2020). Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data.", "Hawley, Suzanne et al. (2014). Kepler Flares. I. Active and Inactive M Dwarfs.", "Kaltenegger, L. et al. (2019). TESS Habitable Zone Star Catalog ."]}
Improved Photometric Metallicity Relationships for K/M Dwarfs from APOGEE Spectra
Creators: name: Medan, Ilija
name: Lepine, Sebastien
name: Hartman, Zach
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence
Abundances

description: For this study, we calibrate a new photometric metallicity relationship using a Gaussian Process Regressor for low-mass dwarfs with 3500<Teff<5280 K that provides an average precision of ±0.12 dex for -2.3<[M/H]<0.5. This regressor is trained with 4296 stars from APOGEE, along with 82 stars from Hejazi et al. (2020), where various combinations of colors and absolute magnitudes from 2MASS, AllWISE, Pan-STARRS and Gaia DR2 are used as inputs. When comparing the resulting calibration to past photometric metallicity relationships derived from APOGEE spectra, we find that these past studies suffer from systematic errors, likely caused by contamination from unresolved binaries in their training subsets. Such systematic errors are largely absent in our results, due to the removal of such contaminants using an iterative method described here. This allows for a more accurate estimate of metallicity for at least 3 million low-mass stars in the vicinity of the Sun that have been measured by 2MASS, AllWISE, Pan-STARRS and Gaia. Additionally, we demonstrate a method to expand this relationship to dwarfs of Teff<3500 K by utilizing wide binary systems. A first attempt provides an average precision of ±0.21 dex, but large systematic errors are present due to the continued presence of unresolved binaries in our training sample. In the future, we plan to better remove unresolved binaries from this sample using programs such as SDSS-V, to create a better relationship that would double the number of stars in the vicinity of the Sun with accurate metallicity estimates.
description: {"references": ["Buitinck, L., Louppe, G., Blondel, M., et al. 2013, in ECML PKDD Workshop: Languages for Data Mining and Machine Learning, 108\u2013122", "Chambers, K. C., Magnier, E. A., Metcalfe, N., et al. 2016, arXiv e-prints, arXiv:1612.05560", "Davenport, J. R., & Dorn-Wallenstein, T. Z. 2019, Research Notes of the American Astronomical Society, 3, 54", "Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al. 2016, A&A, 616, A1", "Green, G. M., Schlafly, E., Zucker, C., Speagle, J. S., & Finkbeiner, D. 2019, ApJ, 887, 93", "Hartman, Z. D., & L\u00e9pine, S. 2020, ApJS, 247, 66", "Hejazi, N., L\u00e9pine, S., Homeier, D., Rich, R. M., & Shara, M. M. 2020, AJ, 159, 30", "Holtzman, J. A., Hasselquist, S., Shetrone, M., et al. 2018, The Astronomical Journal, 156, 125", "Pecaut, M. J., & Mamajek, E. E. 2013, ApJS, 208, 9", "Schmidt, S. J., Wagoner, E. L., Johnson, J. A., et al. 2016, Monthly Notices of the Royal Astronomical Society, Volume 460, Issue 3, p.2611-2624, 460, 2611", "Skrutskie, M. F., Cutri, R. M., Stiening, R., et al. 2006, AJ, 131, 1163", "Wright, E. L., Eisenhardt, P. R. M., Mainzer, A. K., et al. 2010, AJ, 140, 1868"]}
Holomorphicity, Vortex Attachment, Gauge Invariance and the Fractional Quantum Hall Effect
Creators: name: Agarwal, Abhishek
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A gauge invariant reformulation of nonrelativistic fermions in background magnetic fields is used to obtain the Laughlin and Jain wave functions as exact results in Mean Field Theory (MFT). The gauge invariant framework trades the U(1) gauge symmetry for an emergent holomorphic symmetry and fluxes for vortices. The novel holomorphic invariance is used to develop an analytical method for attaching vortices to particles. Vortex attachment methods introduced in this paper are subsequently employed to construct the Read operator within a second quantized framework and obtain the Laughlin and Jain wave functions as exact results entirely within a mean-field approximation. The gauge invariant framework and vortex attachment techniques are generalized to the case of spherical geometry and spherical counterparts of Laughlin and Jain wave functions are also obtained exactly within MFT.
description: 33 pages, no figures. Several Typos corrected in latest version
Weather on Other Worlds. V. The Three Most Rapidly Rotating Ultra-Cool Dwarfs
Creators: name: Tannock, Megan E.
name: Metchev, Stanimir
name: Heinze, Aren
name: Miles-Páez, Paulo
name: Gagné, Jonathan
name: Burgasser, Adam
name: Marley, Mark S.
name: Apai, Dániel
name: Suarez, Genaro
name: Plavchan, Peter
Publisher: name: Zenodo
Year: 2021
Subjects: Very low mass stars
brown dwarfs
rotation
variability
photometry
spectroscopy

description: We present the discovery of rapid photometric variability in three ultra-cool dwarfs from long-duration monitoring with the Spitzer Space Telescope. The T7, L3.5, and L8 dwarfs have the shortest photometric periods known to date: \({1.080}^{+0.004}_{-0.005}\) h, \({1.14}^{+0.03}_{-0.01}\) h, and \({1.23}^{+0.01}_{-0.01}\) h, respectively. We confirm the rapid rotation through moderate-resolution infrared spectroscopy that reveals projected rotational velocities between 79 and 104 km s-1. We compare the near-infrared spectra to photospheric models to determine the objects' fundamental parameters and radial velocities. We find that the equatorial rotational velocities for all three objects are \(\gtrsim\)100 km s-1. The three L and T dwarfs reported here are the most rapidly spinning and likely the most oblate field ultra-cool dwarfs known to date. Correspondingly, all three are excellent candidates for seeking auroral radio emission and net optical/infrared polarization. As of this writing, 78 L-, T-, and Y-dwarf rotation periods have now been measured. The clustering of the shortest rotation periods near 1 h suggests that brown dwarfs are unlikely to spin much faster.
Complex valued Ray-Singer torsion
Creators: name: Burghelea, Dan
name: Haller, Stefan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 57R20, 58J52

description: In the spirit of Ray and Singer we define a complex valued analytic torsion using non-selfadjoint Laplacians. We establish an anomaly formula which permits to turn this into a topological invariant. Conjecturally this analytically defined invariant computes the complex valued Reidemeister torsion, including its phase. We establish this conjecture in some non-trivial situations.
description: Fixed two sign mistakes and added a few more details here and there
Catalog of Nearby Exoplanets
Creators: name: Butler, R. P.
name: Wright, J. T.
name: Marcy, G. W.
name: Fischer, D. A
name: Vogt, S. S.
name: Tinney, C. G.
name: Jones, H. R. A.
name: Carter, B. D.
name: Johnson, J. A.
name: McCarthy, C.
name: Penny, A. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a catalog of nearby exoplanets, available at http://exoplanets.org and ApJ 646, 505 (published version available at the link above). It contains the 172 known low mass companions with orbits established through radial velocity and transit measurements around stars within 200 pc. We include 5 previously unpublished exoplanets orbiting the stars HD 11964, HD 66428, HD 99109, HD 107148, and HD 164922. We update orbits for 90 additional exoplanets including many whose orbits have not been revised since their announcement, and include radial velocity time series from the Lick, Keck, and Anglo-Australian Observatory planet searches. Both these new and previously published velocities are more precise here due to improvements in our data reduction pipeline, which we applied to archival spectra. We present a brief summary of the global properties of the known exoplanets, including their distributions of orbital semimajor axis, minimum mass, and orbital eccentricity.
description: 45-page preprint version. The published ApJ version is available at http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006ApJ...646..505B . Find further information at http://exoplanets.org
Προγραμματισμός απαιτούμενων υλικών στην εταιρία Χ
Creators: name: Γεροντίδης, Κωνσταντίνος Ανέστη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Υλικά Απαιτούμενα-Προγραμματισμός
Materials Requirements-Planning

description: Η παρούσα εργασία αφορά στον προγραμματισμό απαιτούμενων υλικών σε μια πολυεθνική εταιρεία. Αρχικά, όσον αφορά στο θεωρητικό μέρος της εργασίας, γίνεται μια εισαγωγή στο υπό διερεύνηση θέμα όπου περιγράφονται οι πιο βασικές έννοιες. Πιο συγκεκριμένα γίνεται αναφορά στην έννοια των αποθεμάτων, τα είδη αποθεμάτων και τη δημιουργία και διατήρηση αυτών. Επίσης, περιγράφεται η έννοια της διαχείρισης αποθεμάτων και αναφέρεται ο σκοπός διατήρησης αποθεμάτων. Ακολουθεί η παρουσίαση των συστημάτων διαχείρισης αποθεμάτων. Επίσης, στο θεωρητικό μέρος γίνεται αναφορά στα πληροφοριακά συστήματα διαχείρισης αποθεμάτων όπου περιγράφονται εν συντομία τα συστήματα προγραμματισμού απαιτούμενων υλικών (MRP) και ο προγραμματισμός επιχειρησιακών πόρων (ERP). Το γενικό μέρος ολοκληρώνεται με την αναλυτική παρουσίαση των συστημάτων προγραμματισμού απαιτούμενων υλικών. Πιο συγκεκριμένα, υπάρχει ο ορισμός του MRP και αναφέρονται οι βασικές παράµετροι λειτουργίας του. Στη συνέχεια περιγράφονται οι λειτουργικές διαδικασίες, το κύριο πρόγραμμα παραγωγής και τα παράγωγα του συστήματος ΜRP (MRP Outputs). Το θεωρητικό μέρος ολοκληρώνεται με την παράθεση των βασικότερων πλεονεκτημάτων και μειονεκτημάτων ΜRP. Ακολουθεί μελέτη περίπτωσης που πραγματοποιήθηκε στα πλαίσια της εργασίας. Αυτή αφορά στον προγραμματισμό απαιτούμενων υλικών σε μια πολυεθνική εταιρεία Χ η οποία εμπορεύεται χημικά και υλικά για πρώτες ύλες. Η πολυεθνική Χ δουλεύει το σύστημα ERP. Για την παρούσα μελέτη περίπτωσης χρησιμοποιήθηκε το MRP της εταιρείας. Συγκεκριμένα η μελέτη περιλαμβάνει την ανάλυση 15 προϊόντων από την εταιρεία Χ
description: This work involves the Materials Requirements Planning (MRP) in a multinational company. First, regarding the theoretical part of the thesis an introduction to the topic under investigation is given where the most basic concepts are described. More specifically, the basic concepts of stocks, stock types and the stock control models are briefly presented. Then, the information inventory management systems related to Materials Requirement Planning (MRP) and enterprise resource planning (ERP) are described. The theoretical part ends with the quotation of the main advantages and disadvantages of MRP system. In the last Chapter, a case study is analyzed by providing the MRP of 15 products of a multinational company
Detection of the cyanomidyl radical (HNCN): a new interstellar species with the NCN backbone
Creators: name: Rivilla, V. M.
name: Jiménez-Serra, I.
name: de la Concepción, J. García
name: Martín-Pintado, J.
name: Colzi, L.
name: Rodríguez-Almeida, L. F.
name: Tercero, B.
name: Rico-Villas, F.
name: Zeng, S.
name: Martín, S.
name: Requena-Torres, M. A.
name: de Vicente, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We report here the first detection in the interstellar medium of the cyanomidyl radical (HNCN). Using the Yebes 40m and the IRAM 30m telescopes, we have targeted the doublets of the $N$=2$-$1, 4$-$3, 5$-$4, 6$-$5, and 7$-$6 transitions of HNCN toward the molecular cloud G+0.693-0.027. We have detected three unblended lines of HNCN, these are the $N$=6$-$5 doublet and one line of the $N$=4$-$3 transition. Additionally we present one line of the $N$=5$-$4 transition partially blended with emission from other species. The Local Thermodynamic Equilibrium best fit to the data gives a molecular abundance of (0.91$\pm$0.05)$\times$10$^{-10}$ with respect to H$_2$. The relatively low abundance of this species in G+0.693-0.027, and its high reactivity, suggest that HNCN is possibly produced by gas-phase chemistry. Our work shows that this highly reactive molecule is present in interstellar space, and thus it represents a plausible precursor of larger prebiotic molecules with the NCN backbone such as cyanamide (NH$_2$CN), carbodiimide (HNCNH) and formamidine (NH$_2$CHNH).
description: Accepted in Monthly Notices of the Royal Astronomical Society Letters
On the number of minima of a random polynomial
Creators: name: Dedieu, Jean-Pierre
name: Malajovich, Gregorio
Publisher: name: arXiv
Year: 2007
Subjects: subject: Numerical Analysis (math.NA)
subject: Optimization and Control (math.OC)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 65H20; 60D05; 90C30

description: We give an upper bound in O(d ^((n+1)/2)) for the number of critical points of a normal random polynomial with degree d and at most n variables. Using the large deviation principle for the spectral value of large random matrices we obtain the bound O(exp(-beta n^2 + (n/2) log (d-1))) (beta is a positive constant independent on n and d) for the number of minima of such a polynomial. This proves that most normal random polynomials of fixed degree have only saddle points. Finally, we give a closed form expression for the number of maxima (resp. minima) of a random univariate polynomial, in terms of hypergeometric functions.
description: 22 pages. We learned since the first version that the probability that a matrix in GOE(n) is positive definite is known. This follows from the theory of large deviations (reference in the paper). Therefore, we can now state a precise upper bound (Theorem 2) for the number of minima of a random polynomial, instead of a bound depending on that probability
Dynamics and decay rates of a time-dependent two-saddle system
Creators: name: Reiff, Johannes
name: Feldmaier, Matthias
name: Main, Jörg
name: Hernandez, Rigoberto
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The framework of transition state theory (TST) provides a powerful way for analyzing the dynamics of physical and chemical reactions. While TST has already been successfully used to obtain reaction rates for systems with a single time-dependent saddle point, multiple driven saddles have proven challenging because of their fractal-like phase space structure. This paper presents the construction of an approximately recrossing-free dividing surface based on the normally hyperbolic invariant manifold in a time-dependent two-saddle model system. Based on this, multiple methods for obtaining instantaneous (time-resolved) decay rates of the underlying activated complex are presented and their results discussed.
description: 13 pages and 9 figures
AAVSO "PEP" Photometry of the Great Dimming of Betelgeuse
Creators: name: Calderwood, Tom
name: Persha, Jerry
name: Kneipp, Paul
name: van Ballegoij, Erwin
name: Dempsey, Frank
name: Fox, Jim
name: Martin, John
name: Schlaf, Eric
Publisher: name: Zenodo
Year: 2021
Subjects: Post main sequence cool stars
Betelgeuse
photometry

description: Observers most commonly use imagers to gather Johnson/Cousins photometry, but cameras have a difficult time with stars as bright as alpha Orionis. Superior results are obtainable with single-channel photometers in the old-school technique known as PEP. We review such data in UBVRIJH from 2019-2020.
The application of piezoceramic bender elements to the laboratory measurement of elastic wave velocities
Creators: name: Jarvis, Kevin Donald Gibson
Publisher: name: University of British Columbia
Year: 2009

description: The objective of this thesis is to evaluate bender elements as a source and receiver of elastic waves in cohesionless sand. The techniques used to build the benders that are detailed include the use of an impedance analyzer to monitor changes in the electrical and mechanical response. Placing the benders in a bucket of sand demonstrated the short compact nature of the bender waveform in both a shear and compressional wave orientation. An experiment in a non-homogeneous sandbox showed the change in shear waveform with separation of the elements. A Plexiglas cylinder with benders was used to measure changes in shear and compressional wave velocity as a function of confining pressure and the saturation with water and silicon oil. The effects of friction along the walls of the cylinder resulted in an unknown and irreproducible confining stress on the sand between the benders. An experiment to study the effect of silicon oil viscosity on shear modulus was inconclusive as a result of the unknown stress condition. The bender elements proved to be an excellent source and receiver of elastic waves in cohesionless sand.
The gravitational field of a star in quadratic gravity
Creators: name: Bonanno, Alfio
name: Silveravalle, Samuele
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The characterization of the gravitational field of isolated objects is still an open question in quadratic theories of gravity. We study static equilibrium solutions for a self-gravitating fluid in extensions of General Relativity including terms quadratic in the Weyl tensor $C_{μνρσ}$ and in the Ricci scalar $R$, as suggested by one-loop corrections to classical gravity. By the means of a shooting method procedure we link the total gravitational mass and the strength of the Yukawa corrections associated with the quadratic terms with the fluid properties at the center. It is shown that the inclusion of the $C_{μνρσ}C^{μνρσ}$ coupling in the lagrangian has a much stronger impact than the $R^2$ correction in the determination of the radius and of the maximum mass of a compact object. We also suggest that the ambiguity in the definition of mass in quadratic gravity theories can conveniently be exploited to detect deviations from standard General Relativity.
description: 18 pages, 7 figures, 1 table
Transmission eigenchannels from non-equilibrium Green's functions
Creators: name: Paulsson, Magnus
name: Brandbyge, Mads
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The concept of transmission eigenchannels is described in a tight-binding nonequilibrium Green's function (NEGF) framework. A simple procedure for calculating the eigenchannels is derived using only the properties of the device subspace and quantities normally available in a NEGF calculation. The method is exemplified by visualization in real-space of the eigenchannels for three different molecular and atomic-wires.
description: 9 pages, 5 figures http://link.aps.org/abstract/PRB/v76/e115117
INNOVATSION TA'LIM TEXNOLOGIYASIDAN FOYDALANGAN HOLDA CHEGIRMALAR MAVZUSINI O'QITISH
Creators: name: Nazarboyeva Xosiyat Gulmirzo qizi Chirchiq davlat pedagogika universiteti Aniq va tabiiy fanlarni o'qitish metodikasi (matematika) mutaxassisligi magistri
Publisher: name: Zenodo
Year: 2024

description: Ba’zi  integrallarning  qiymatlarini oddiy  usullarda  hisoblash  birmuncha  qiyinchiliklar  tug’dirishi  mumkin. Ammo, chegirmalardan samarali foydalangan holda bu integrallarning qiymatlarini oson hisoblash mumkin. OTM larda chegirmalar mavzusini o’rgatishda innovatsion texnologiyalardan foydalanish samarali natijaga olib keladi. Shu  sababdan  ushbu maqola matematik  analiz  va  kompleks  analiz kurslarini o’zlashtirayotgan talabalar uchun muhim qo’llanma hisoblanadi.

Kalit so’zlar: innovatsiya,maxsus nuqta,qutb nuqta,golomorf,chegirma,integral
Mapping relativistic to ultra/non-relativistic conformal symmetries in 2D and finite $\sqrt{T\bar{T}}$ deformations
Creators: name: Rodríguez, Pablo
name: Tempo, David
name: Troncoso, Ricardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The conformal symmetry algebra in 2D (Diff($S^{1}$)$\oplus$Diff($S^{1}$)) is shown to be related to its ultra/non-relativistic version (BMS$_{3}$$\approx$GCA$_{2}$) through a nonlinear map of the generators, without any sort of limiting process. For a generic classical CFT$_{2}$, the BMS$_{3}$ generators then emerge as composites built out from the chiral (holomorphic) components of the stress-energy tensor, $T$ and $\bar{T}$, closing in the Poisson brackets at equal time slices. Nevertheless, supertranslation generators do not span Noetherian symmetries. BMS$_{3}$ becomes a bona fide symmetry once the CFT$_{2}$ is marginally deformed by the addition of a $\sqrt{T\bar{T}}$ term to the Hamiltonian. The generic deformed theory is manifestly invariant under diffeomorphisms and local scalings, but it is no longer a CFT$_{2}$ because its energy and momentum densities fulfill the BMS$_{3}$ algebra. The deformation can also be described through the original CFT$_{2}$ on a curved metric whose Beltrami differentials are determined by the variation of the deformed Hamiltonian with respect to $T$ and $\bar{T}$. BMS$_{3}$ symmetries then arise from deformed conformal Killing equations, corresponding to diffeomorphisms that preserve the deformed metric and stress-energy tensor up to local scalings. As an example, we briefly address the deformation of $\mathrm{N}$ free bosons, which coincides with ultra-relativistic limits only for $\mathrm{N}=1$. Furthermore, Cardy formula and the S-modular transformation of the torus become mapped to their corresponding BMS$_{3}$ (or flat) versions.
description: 18 pages. Minor changes, typos corrected and references added
Nonequilibrium dynamics in the O(N) model to next-to-next-to-leading order in the 1/N expansion
Creators: name: Aarts, Gert
name: Tranberg, Anders
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Nonequilibrium dynamics in quantum field theory has been studied extensively using truncations of the 2PI effective action. Both 1/N and loop expansions beyond leading order show remarkable improvement when compared to mean-field approximations. However, in truncations used so far, only the leading-order parts of the self energy responsible for memory loss, damping and equilibration are included, which makes it difficult to discuss convergence systematically. For that reason we derive the real and causal evolution equations for an O(N) model to next-to-next-to-leading order in the 2PI-1/N expansion. Due to the appearance of internal vertices the resulting equations appear intractable for a full-fledged 3+1 dimensional field theory. Instead, we solve the closely related three-loop approximation in the auxiliary-field formalism numerically in 0+1 dimensions (quantum mechanics) and compare to previous approximations and the exact numerical solution of the Schroedinger equation.
description: 29 pages, minor changes, references added; to appear in PRD
A thermodynamic approach to the T-models
Creators: name: Ferrando, Joan Josep
name: Mengual, Salvador
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The perfect fluid solutions admitting a group G$_3$ of isometries acting on orbits S$_2$ whose curvature has a gradient which is tangent to the fluid flow (T-models) are studied from a thermodynamic approach. All the admissible thermodynamic schemes are obtained, and the solutions compatible with the generic ideal gas equation of state are studied in detail. The possible physical interpretation of some previously known T-models is also analyzed.
description: 13 pages
Decoherence processes of a quantum two-level system coupled to a fermionic environment
Creators: name: Yamada, Naoyoshi
name: Sakuma, Akimasa
name: Tsuchiura, Hiroki
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study decoherence processes of an S = 1/2 localized spin coupled to conduction band electrons in a metal or a semiconductor via an Ising-like interaction. We derive master equations for the density matrix of the localized spin, by tracing out all degrees of freedom in the conduction electron system based on the linked-cluster-expansion technique. It is found that the decoherence occurs more rapidly for the metallic case than for semiconducting case.
description: to appear in J. Appl. Phys
An atomic compass -- detecting 3D magnetic field alignment with vector vortex light
Creators: name: Castellucci, Francesco
name: Clark, Thomas W.
name: Selyem, Adam
name: Wang, Jinwen
name: Franke-Arnold, Sonja
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We describe and demonstrate how 3D magnetic field alignment can be inferred from single absorption images of an atomic cloud. While optically pumped magnetometers conventionally rely on temporal measurement of the Larmor precession of atomic dipoles, here a cold atomic vapour provides a spatial interface between vector light and external magnetic fields. Using a vector vortex beam, we inscribe structured atomic spin polarisation in a cloud of cold rubidium atoms, and record images of the resulting absorption patterns. The polar angle of an external magnetic field can be deduced with spatial Fourier analysis. This effect presents an alternative concept for detecting magnetic vector fields, and demonstrates, more generally, how introducing spatial phases between atomic energy levels can translate transient effects to the spatial domain.
Актуальные вопросы современной экономики,Выпуск 1 2024
Creators: name: ООО "Институт развития образования и консалтинга"
Publisher: name: ООО "Институт развития образования и консалтинга"
Year: 2024

description: Актуальные вопросы современной экономики,Выпуск 1 2024
Lexical and grammatical elicitation: Months, body parts, foods, family terms, verbal agreement paradigms
Creators: name: Chebet Bett, Lydia
name: Bossi, Madeline
name: Bett, Beatrice
name: Bett, John
name: Kipkoech, Linus
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: sgc

description: One .wav file and one .pdf file. Elicitation of lexical items for months, body parts, foods, and family terms. Elicitation of verbal agreement paradigms for unergatives and transitives.
A Physical Relationship Between Electron-Proton Temperature Equilibration and Mach Number in Fast Collisionless Shocks
Creators: name: Ghavamian, Parviz
name: Laming, J. Martin
name: Rakowski, Cara E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The analysis of Balmer-dominated optical spectra from non-radiative (adiabatic) SNRs has shown that the ratio of the electron to proton temperature temperature at the blast wave is close to unity at v_s <= 400 km/s, but declines sharply down to the minimum value of (m_e/m_p) dictated by the jump conditions at shock speeds exceeding 2000 km/s. We propose a physical model for the heating of electrons and ions in non-cosmic ray dominated, strong shocks (v_s > 400 km/s) wherein the electrons are heated by lower hybrid waves immediately ahead of the shock front. These waves arise naturally from the cosmic ray pressure gradient upstream from the shock. Our model predicts a nearly constant level of electron heating over a wide range of shock speeds, producing a relationship T_e/T_p ~ 1/v_s**2 (~ 1 /M**2) that is fully consistent with the observations.
description: 5 pages, 2 figures, accepted for publication in ApJ Letters
Unveiling the nature of INTEGRAL sources through optical spectroscopy
Creators: name: Masetti, Nicola
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Since its launch on October 2002 the INTEGRAL satellite is performing an deep survey of the hard X-ray sky with unprecedented sensitivity and positional accuracy. This allowed pinpointing, through positional cross-correlation with catalogs at longer wavelengths, possible optical/near-infrared candidates for the hard X-ray sources of still unknown nature. In this presentation I will describe this work as well as the observational activities aimed at determining, through optical spectroscopy, the nature of the unknown INTEGRAL sources, along with the main results of this search. Future prospects about this identification program will also be illustrated.
description: 6 pages (including discussion), 1 figure. To appear on the Procs. of Frascati Workshop 2005 on Multifrequency Behaviour of High Energy Cosmic Sources (held in Vulcano, Italy, 23-28 May 2005; ed. F. Giovannelli & L. Sabau-Graziati, to be published on ChJAA Suppl.). This contribution depicts the situation on the subject at the time of the conference (May 2005)
Casimir-Lifshitz Theory and Metamaterials
Creators: name: Rosa, F. S. S.
name: Dalvit, D. A. R.
name: Milonni, P. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Based on a generalization of the Lifshiftz theory we calculate Casimir forces involving magnetodielectric and possibly anisotropic metamaterials, focusing on the possibility of repulsive forces. It is found that Casimir repulsion decreases with magnetic dissipation, and even a small Drude background in metallic-based metamaterials acts to make attractive a Casimir force that would otherwise be predicted to be repulsive. The sign of the force also depends sensitively on the degree of optical anisotropy of the metamaterial, and on the form of the frequency-dependency of the magnetic response.
A biased MC for muon production for beam-dump experiments
Creators: name: Ghinescu, Stefan
name: Döbrich, Babette
name: Minucci, Elisa
name: Spadaro, Tommaso
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The search for feebly-interacting new-physics particles in the MeV-GeV mass range often involves high-intensity beams dumped into thick heavy targets. The challenge of evaluating the expected backgrounds for these searches from first principles is limited by the CPU time needed to generate the shower induced by the primary beam. We present a Monte Carlo biasing method allowing a three orders of magnitude increase in the efficiency for the simulation of the muon production in a 400 GeV$/c$ proton beam-dump setup. At the same time, this biasing method is maintaining nearly every feature of a simulation from first principles.
Additional file 6 of Genome-wide identification and expression profiling of DREB genes in Saccharum spontaneum
Creators: name: Li, Zhen
name: Wang, Gang
name: Liu, Xihui
name: Wang, Zhengchao
name: Zhang, Muqing
name: Zhang, Jisen
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 6. Gene primers used for qRT-PCR analysis.
Vertical Cloud Structure of an AB Pictoris b Analog through Keck I/MOSFIRE spectro-photometric variability
Creators: name: Manjavacas, Elena
name: Karalidi, Theodora
name: Vos, Johanna
name: Biller, Beth
name: Lew, Ben
Publisher: name: Zenodo
Year: 2021
Subjects: Brown Dwarfs
Giant Exoplanets
Directly-imaged Exoplanets

description: Photometric variability at different wavelengths provide insights into the vertical cloud structure of brown dwarfs and planetary-mass objects.
 We obtained time-resolved spectroscopy in the J-band of the planetary-mass L3 dwarf 2MASS J22081363+2921215, analog to the AB Pic b planet, obtaining a variability amplitude of 3.23%. We find that the variability of object is enhanced in the KI and Na I alkali lines.
 Using radiative-transfer models, we derived the different cloud layers that might be introducing the spectro-photometric variability we observe for 2MASS J22081363+2921215.
Consistency of particle-particle random-phase approximation and its renormalizations
Creators: name: Dang, Nguyen Dinh
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The consistency condition is tested within the particle-particle random-phase approximation (RPA), renormalized RPA (RRPA) and the self-consistent RPA (SCRPA) making use of the Richardson model of pairing. The two-particle separation energy is calculated in two ways, namely as the energy of the first addition mode, which adds two particles to a core with N particles, and as the energy of the first removal mode, which removes two particles from the (N+2) - particle system to get back to the same N-particle core. The corresponding transitions generated by the pairing operators are also calculated. It is found that the results obtained in these two ways of calculations are close to each other only at large values of particle number N and/or small interaction strength. At N below 10 for a given value of the interaction strength, the discrepancy between the results obtained in two ways of calculations within the SCRPA is much smaller than those given by the RPA and RRPA.
description: 16 pages, 3 figures, accepted in Physical Revew C
Long-Term Evolution of Three Light Bridges Developed on the Same Sunspot
Creators: name: Griñón-Marín, Ana Belén
name: Yabar, Adur Pastor
name: Centeno, Rebecca
name: Socas-Navarro, Héctor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: One important feature of sunspots is the presence of light bridges. These structures are elongated and bright (as compared to the umbra) features that seem to be related to the formation and evolution of sunspots. In this work, we studied the long-term evolution and the stratification of different atmospheric parameters of three light bridges formed in the same host sunspot by different mechanisms. To accomplish this, we used data taken with the GREGOR Infrared Spectrograph installed at the GREGOR telescope. These data were inverted to infer the physical parameters of the atmosphere where the observed spectral profiles were formed of the three light bridges. We find that, in general, the behaviour of the three light bridges is typical of this kind of structure with the magnetic field strength, inclination, and temperature values between the values at the umbra and the penumbra. We also find that they are of a significantly non-magnetic character (particularly at the axis of the light bridges) as it is deduced from the filling factor. In addition, within the common behaviour of the physical properties of light bridges, we observe that each one exhibits a particular behaviour. Another interesting result is that the light bridge cools down, the magnetic field decreases, and the magnetic field lines get more inclined higher in the atmosphere. Finally, we studied the magnetic and non-magnetic line-of-sight velocities of the light bridges. The former shows that the magnetic component is at rest and, interestingly, its variation with optical depth shows a bi-modal behaviour. For the line-of-sight velocity of the non-magnetic component, we see that the core of the light bridge is at rest or with shallow upflows and clear downflows sinking through the edges.
Entanglement Wedge Cross Section Inequalities from Replicated Geometries
Creators: name: Bao, Ning
name: Chatwin-Davies, Aidan
name: Remmen, Grant N.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We generalize the constructions for the multipartite reflected entropy in order to construct spacetimes capable of representing multipartite entanglement wedge cross sections of differing party number as Ryu-Takayanagi surfaces on a single replicated geometry. We devise a general algorithm for such constructions for arbitrary party number and demonstrate how such methods can be used to derive novel inequalities constraining mulipartite entanglement wedge cross sections.
description: 23 pages, 9 figures
Description of $^{4}$He tetramer bound and scattering states
Creators: name: Lazauskas, R.
name: Carbonell, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Faddeev-Yakubovski equations are solved numerically for 4He tetramer and trimer states using realistic helium-helium interaction models. We describe the properties of ground and excited states, and we discuss with a special emphasis the 4He-4He3 low energy scattering.
Meromorphic Behavior of Time Dependent Schroedinger Equation
Creators: name: Dutta, R.
name: Stan, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 14J60 (Primary) 14F05, 14J26 (Secondary)

description: We try to obtain meromorphic solution of Time dependent Schroedinger equation which partially satisfies Painleve Integrable property. Our study and analysis exhibits meromorphic behavior of classical particle trajectory. In other words, particle is confined in punctured complex domain in singular fundamental domain. . We have explicitly developed solution from Jacobi Elliptic function and pole expansion approach in which solution remains meromorphic . Branch point analysis also shows solution branches out near such singular point. Meromorphic behavior is significant for a classical particle within quantum limit.
description: Key word: movable singularity, Non Linear ODE, Meromorphic solution
Holographic entanglement entropy of deSitter braneworld with Lovelock
Creators: name: Kushihara, Kouki
name: Izumi, Keisuke
name: Shiromizu, Tetsuya
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We examine the deSitter entropy in the braneworld model with the Gauss-Bonnet/Lovelock terms. Then, we can see that the deSitter entropy computed through the Euclidean action exactly coincides with the holographic entanglement entropy.
description: 10pages
Firebird Database Backup by Serialized Database Table Dump
Creators: name: Ling, Maurice HT
Publisher: name: arXiv
Year: 2007
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences
subject: H.2.7; E.5

description: This paper presents a simple data dump and load utility for Firebird databases which mimics mysqldump in MySQL. This utility, fb_dump and fb_load, for dumping and loading respectively, retrieves each database table using kinterbasdb and serializes the data using marshal module. This utility has two advantages over the standard Firebird database backup utility, gbak. Firstly, it is able to backup and restore single database tables which might help to recover corrupted databases. Secondly, the output is in text-coded format (from marshal module) making it more resilient than a compressed text backup, as in the case of using gbak.
description: 5 pages
Cold uniform matter and neutron stars in the quark-mesons-coupling model
Creators: name: Rikovska-Stone, J.
name: Guichon, P. A. M.
name: Matevosyan, H. H.
name: Thomas, A. W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A new density dependent effective baryon-baryon interaction has been recently derived from the quark-meson-coupling (QMC) model, offering impressive results in application to finite nuclei and dense baryon matter. This self-consistent, relativistic quark-level approach is used to construct the Equation of State (EoS) and to calculate key properties of high density matter and cold, slowly rotating neutron stars. The results include predictions for the maximum mass of neutron star models, together with the corresponding radius and central density, as well the properties of neutron stars with mass of order 1.4 $M_\odot$. The cooling mechanism allowed by the QMC EoS is explored and the parameters relevant to slow rotation, namely the moment of inertia and the period of rotation investigated. The results of the calculation, which are found to be in good agreement with available observational data, are compared with the predictions of more traditional EoS. The QMC EoS provides cold neutron star models with maximum mass 1.9--2.1 M$_\odot$, with central density less than 6 times nuclear saturation density ($n_{0}= 0.16 {\rm fm}^{-3}$) and offers a consistent description of the stellar mass up to this density limit. In contrast with other models, QMC predicts no hyperon contribution at densities lower than $3n_0$, for matter in $β$-equilibrium. At higher densities, $Ξ^{-,0}$ and $Λ$ hyperons are present.