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Journal articles on the topic 'Sign problem'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 April 2022

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1

Kieu, T. D., and C. J. Griffin. "TACKLING THE SIGN PROBLEM." International Journal of Modern Physics C 05, no. 02 (1994): 275–77. http://dx.doi.org/10.1142/s0129183194000313.

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To tackle the sign problem in the simulations of systems having indefinite or complex-valued measures, we propose a new approach which yields statistical errors smaller than the crude Monte Carlo using absolute values of the original measures. The 1D complex-coupling Ising model is employed as an illustration.

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2

Gómez, Bernardo. "<p>El análisis de manuales y la identificación de problemas de investigación en Didáctica de las Matemáticas</p>." PNA. Revista de Investigación en Didáctica de la Matemática 5, no. 2 (2011): 49–65. http://dx.doi.org/10.30827/pna.v5i2.6157.

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La ambigüedad del signo radical es un problema con raíces históricas que ha quedado recogido en una tradición de enseñanza reflejada en los manuales escolares. Como problema matemático ha sido resuelto, pero no como problema didáctico, ya que el signo radical presenta sutilezas conceptuales y operatorias cuya omisión en los manuales es a menudo causa de malentendidos y conflictos fuertemente arraigados. Algunos de esos malentendidos son un producto de la enseñanza tradicional reflejada en los manuales que ignora los desarrollos matemáticos actuales. En este artículo se utiliza el análisis text

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3

Vershyna, V. A., and O. V. Mykhailiuk. "Laughter as a Semiotic Problem." Anthropological Measurements of Philosophical Research, no. 20 (December 28, 2021): 5–15. http://dx.doi.org/10.15802/ampr.v0i20.248949.

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Purpose. The article is aimed to substantiate the view on the phenomenon of laughter as a subject of semiotic analysis, which leads to the following tasks: to reveal the possibilities of semiotics application in the study of laughter nature; to analyze the phenomenon of laughter as a cultural and natural phenomenon, as a sign and as an attribute; to consider the place of laughter in culture, which is understood as a sign system. Theoretical basis. The semiotic approach proceeds from the fact that human lives in the world of signs, all the surrounding reality can be interpreted as a sign system

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4

Singh, B. "A problem with the Mallampati sign." Anaesthesia 48, no. 9 (1993): 832–33. http://dx.doi.org/10.1111/j.1365-2044.1993.tb07627.x.

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5

Hangleiter, Dominik, Ingo Roth, Daniel Nagaj, and Jens Eisert. "Easing the Monte Carlo sign problem." Science Advances 6, no. 33 (2020): eabb8341. http://dx.doi.org/10.1126/sciadv.abb8341.

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Quantum Monte Carlo (QMC) methods are the gold standard for studying equilibrium properties of quantum many-body systems. However, in many interesting situations, QMC methods are faced with a sign problem, causing the severe limitation of an exponential increase in the runtime of the QMC algorithm. In this work, we develop a systematic, generally applicable, and practically feasible methodology for easing the sign problem by efficiently computable basis changes and use it to rigorously assess the sign problem. Our framework introduces measures of non-stoquasticity that—as we demonstrate analyt

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6

SAMSON, J. H. "AUXILIARY FIELDS AND THE SIGN PROBLEM." International Journal of Modern Physics C 06, no. 03 (1995): 427–65. http://dx.doi.org/10.1142/s0129183195000290.

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The auxiliary-field quantum Monte Carlo method is reviewed. The Hubbard-Stratonovich transformation converts an interacting Hamiltonian into a non-interacting Hamiltonian in a time-dependent stochastic field, allowing calculation of the resulting functional integral by Monte Carlo methods. The method is presented in a sufficiently general form to be applicable to any Hamiltonian with one- and two-body terms, with special reference to the Heisenberg model and one- and many-band Hubbard models. Many physical correlation functions can be related to correlation functions of the auxiliary field; ge

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7

Sevast'yanov, E. A. "Haar problem for sign-sensitive approximations." Sbornik: Mathematics 188, no. 2 (1997): 265–97. http://dx.doi.org/10.1070/sm1997v188n02abeh000203.

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8

Farajzadeh, Ali, Somaye Jafari та Chin-Tzong Pang. "Onη-Upper Sign Property and Upper Sign Continuity and Their Applications in Equilibrium-Like Problems". Abstract and Applied Analysis 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/207502.

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We first introduce the notion ofη-upper sign property which is an extension of the upper sign property introduced in Castellani and Giuli, 2013, by relaxing convexity on the set. Afterwards, we establish a link between the solution sets of local dual equilibrium problem (Minty local equilibrium problem) and equilibrium problem for mappings whose domains are not necessarily convex by relaxing the upper sign continuity on the map, as it is assumed in the literature (Bianchi and Pini, 2005; Castellani and Giuli, 2013; Farajzadeh and Zafarani, 2010). Accordingly, it allows us to extend and obtain

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9

Ohnishi, Akira, Yuto Mori, and Kouji Kashiwa. "Path optimization method for the sign problem." EPJ Web of Conferences 175 (2018): 07043. http://dx.doi.org/10.1051/epjconf/201817507043.

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We propose a path optimization method (POM) to evade the sign problem in the Monte-Carlo calculations for complex actions. Among many approaches to the sign problem, the Lefschetz-thimble path-integral method and the complex Langevin method are promising and extensively discussed. In these methods, real field variables are complexified and the integration manifold is determined by the flow equations or stochastically sampled. When we have singular points of the action or multiple critical points near the original integral surface, however, we have a risk to encounter the residual and global si

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10

Hanada, Masanori, Yoshinori Mastuo, and Naoki Yamamoto. "String inspired solution to the sign problem and overlapping problem." Journal of Physics: Conference Series 432 (April 30, 2013): 012008. http://dx.doi.org/10.1088/1742-6596/432/1/012008.

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11

Khmel', I. V. "The Problem of the Written Sign Evolution." Anthropological Measurements of Philosophical Research 1, no. 1 (2012): 48–51. http://dx.doi.org/10.15802/ampr2012/7818.

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12

Lee, Dean. "Zone methods and the fermion sign problem." Nuclear Physics B - Proceedings Supplements 119 (May 2003): 979–81. http://dx.doi.org/10.1016/s0920-5632(03)01736-5.

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13

HSU, STEPHEN D. H., and DAVID REEB. "ON THE SIGN PROBLEM IN DENSE QCD." International Journal of Modern Physics A 25, no. 01 (2010): 53–67. http://dx.doi.org/10.1142/s0217751x10047968.

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We investigate the Euclidean path integral formulation of QCD at finite baryon density and temperature. We show that the partition function Z can be written as a difference between two sums Z+ and Z-, each of which defines a partition function with positive weights. We call the sign problem severe if the ratio Z-/Z+ is nonzero in the infinite volume limit. This occurs only if, and generically always if, the associated free energy densities F± are equal in this limit. We present strong evidence here that the sign problem is severe at almost all points in the phase diagram, with the exception of

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14

Bedaque, Paulo F. "A complex path around the sign problem." EPJ Web of Conferences 175 (2018): 01020. http://dx.doi.org/10.1051/epjconf/201817501020.

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We review recent attempts at dealing with the sign problem in Monte Carlo calculations by deforming the region of integration in the path integral from real to complex fields. We discuss the theoretical foundations, the algorithmic issues and present some results for low dimensional field theories in both imaginary and real time.

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15

Cristoforetti, Marco, Luigi Scorzato, and Francesco Di Renzo. "The sign problem and the Lefschetz thimble." Journal of Physics: Conference Series 432 (April 30, 2013): 012025. http://dx.doi.org/10.1088/1742-6596/432/1/012025.

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16

Nicholson, Amy N., Dorota Grabowska, and David B. Kaplan. "Elucidating the sign problem through noise distributions." Journal of Physics: Conference Series 432 (April 30, 2013): 012032. http://dx.doi.org/10.1088/1742-6596/432/1/012032.

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17

Batrouni, Ghassan George, and Richard T. Scalettar. "Anomalous decouplings and the fermion sign problem." Physical Review B 42, no. 4 (1990): 2282–89. http://dx.doi.org/10.1103/physrevb.42.2282.

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18

Mondaini, R., S. Tarat, and R. T. Scalettar. "Quantum critical points and the sign problem." Science 375, no. 6579 (2022): 418–24. http://dx.doi.org/10.1126/science.abg9299.

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The “sign problem” (SP) is a fundamental limitation to simulations of strongly correlated matter. It is often argued that the SP is not intrinsic to the physics of particular Hamiltonians because its behavior can be influenced by the choice of algorithm. By contrast, we show that the SP in determinant quantum Monte Carlo (QMC) is quantitatively linked to quantum critical behavior. We demonstrate this through simulations of several models with critical properties that are relatively well understood. We propose a reinterpretation of the low average sign for the Hubbard model on the square lattic

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19

Rantaharju, Jarno. "Accurate simulation of the finite density lattice Thirring model." EPJ Web of Conferences 175 (2018): 07011. http://dx.doi.org/10.1051/epjconf/201817507011.

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We present a study of the finite density lattice Thirring model in 1+1 dimensions using the world-line/fermion-bag algorithm. The model has features similar to QCD and provides a test case for exploring the accuracy of various methods of solving sign problems. In the massless limit and with open boundary conditions we show that the sign problem is an artifact of the auxiliary field approach and is completely eliminated in the fermion bag approach. With periodic boundary conditions the sign problem is mild in the fermion bag method. We present accurate results for various quantities in the mode

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20

Zorins, Aleksejs, and Pēteris Grabusts. "APPROACHES AND SOLUTIONS FOR SIGN LANGUAGE RECOGNITION PROBLEM." SOCIETY. INTEGRATION. EDUCATION. Proceedings of the International Scientific Conference 5 (May 25, 2018): 475–83. http://dx.doi.org/10.17770/sie2018vol1.3082.

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The goal of the paper is reviewing several aspects of Sign Language Recognition problems focusing on Artificial Neural Network approach. The lack of automated Latvian Sign Language has identified and proposals of how to develop such a system have made. Tha authors use analytical, statistical methods as well as practical experiments with neural network software. The main results of the paper are description of main Sign Language Recognition problem solving methods with Artificial Neural Networks and directions of future work based on authors’ previous expertise.

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21

Scoglietti, Vincent C., Kristin T. Collier, Eric L. Long, Geary P. D. Bush, Jason R. Chapman, and Don K. Nakayama. "After-Hours Complications: Evaluation of the Predictive Accuracy of Resident Sign-Out." American Surgeon 76, no. 7 (2010): 682–86. http://dx.doi.org/10.1177/000313481007600719.

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Resident duty-hour restrictions demand effective communication and teamwork in patient care. The process of resident sign-out is a potential source of miscommunication and medical error. Resident sign-out was followed over a 3-month period. Residents signing out to the night coverage team were asked to identify two patient groups: 1) problem patients who were especially ill and likely to present specific clinical problems; and 2) nonproblem patients who were likely not to be at risk for a problem requiring attention. Data on adverse events collected by the night float resident were classified

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22

Yoo, Jaebeom, Shailesh Chandrasekharan, Ribhu K. Kaul, Denis Ullmo, and Harold U. Baranger. "On the sign problem in the Hirsch–Fye algorithm for impurity problems." Journal of Physics A: Mathematical and General 38, no. 48 (2005): 10307–10. http://dx.doi.org/10.1088/0305-4470/38/48/004.

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23

Cabada, Alberto, Lucía López-Somoza, and Mouhcine Yousfi. "Constant-Sign Green’s Function of a Second-Order Perturbed Periodic Problem." Axioms 11, no. 3 (2022): 139. http://dx.doi.org/10.3390/axioms11030139.

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In this paper, we were interested in obtaining the exact expression and studying the regions of constant sign of Green’s function related to a second-order perturbed periodic problem coupled with integral boundary conditions at the extremes of the interval of the definition. To obtain the expression of Green’s function related to this problem, we used the theory presented in a previous paper of the authors for general non-local perturbed boundary-value problems. Moreover, we characterized the parameter set where such a Green’s function has a constant sign. To this end, we needed to consider fi

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24

Bayuk, Dimitri A., and Olga B. Fedorova. "G.W. Leibniz: Sign and the Problem of Expression." Epistemology & Philosophy of Science 57, no. 1 (2020): 146–65. http://dx.doi.org/10.5840/eps202057112.

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The disciplinary differentiation of sciences attracted Leibniz’s attention for a long period of time. From nowadays prospects it looks very well grounded as soon as in Leibniz’s manuscripts a modern scholar finds clue ideas of any research field which would tempt him to consider Leibniz as one of the founders of this particular discipline. We argue that this is possible only in retrospection and would significantly distort the essence of Leibniz’s epistemology. Our approach implies, in contrary, the investigation of the Leibniz doctrine of signs on the background of the related philosophical p

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25

Kasemset, Chompoonoot, Chawis Boonmee, and Masahiro Arakawa. "Traffic Information Sign Location Problem: Optimization and Simulation." Industrial Engineering & Management Systems 19, no. 1 (2020): 228–41. http://dx.doi.org/10.7232/iems.2020.19.1.228.

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26

Saikali, Khalil G., and Roger L. Berger. "More powerful tests for the sign testing problem." Journal of Statistical Planning and Inference 107, no. 1-2 (2002): 187–205. http://dx.doi.org/10.1016/s0378-3758(02)00252-5.

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27

Barabanov, A. E., and A. M. Ghulchak. "H∞ optimization problem with sign-indefinite quadratic form." Systems & Control Letters 29, no. 3 (1996): 157–64. http://dx.doi.org/10.1016/s0167-6911(96)00054-0.

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28

Myung-Gon Yoon. "Sign-weighted peak minimization problem for feedback systems." IEEE Transactions on Automatic Control 45, no. 6 (2001): 943–48. http://dx.doi.org/10.1109/9.928601.

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29

Andersson, John, Erik Lindgren, and Henrik Shahgholian. "Optimal Regularity for the No-Sign Obstacle Problem." Communications on Pure and Applied Mathematics 66, no. 2 (2012): 245–62. http://dx.doi.org/10.1002/cpa.21434.

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30

MURAMATSU, A., G. ZUMBACH, and X. ZOTOS. "A GEOMETRICAL VIEW OF THE MINUS-SIGN PROBLEM." International Journal of Modern Physics C 03, no. 01 (1992): 185–93. http://dx.doi.org/10.1142/s0129183192000154.

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It is shown that the sign of the fermionic determinant in the projector Monte Carlo method is directly related to a topological invariant. A key ingredient to obtain this result is the identification of the appropriate manifolds to describe the evolution of a fermionic trial wavefunction. They allow for a purely geometrical consideration of the minus-sign problem.

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31

Batrouni, Ghassan George, and Philippe de Forcrand. "Fermion sign problem: Decoupling transformation and simulation algorithm." Physical Review B 48, no. 1 (1993): 589–92. http://dx.doi.org/10.1103/physrevb.48.589.

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32

Deng, Shengbing, and Monica Musso. "High energy sign-changing solutions for Coron's problem." Journal of Differential Equations 271 (January 2021): 916–62. http://dx.doi.org/10.1016/j.jde.2020.09.021.

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33

Frick, M., and H. De Raedt. "Projector Quantum Monte Carlo without minus-sign problem." Zeitschrift für Physik B Condensed Matter 88, no. 2 (1992): 173–79. http://dx.doi.org/10.1007/bf01323569.

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34

Nagashima, Fumiya. "The sign reversal problem in structural decomposition analysis." Energy Economics 72 (May 2018): 307–12. http://dx.doi.org/10.1016/j.eneco.2018.04.027.

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35

Yang, Bian-Xia. "Spectrum and constant sign solutions for a fractional Laplace problem with sign-changing weight." Journal of Mathematical Analysis and Applications 483, no. 1 (2020): 123528. http://dx.doi.org/10.1016/j.jmaa.2019.123528.

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36

WIESE, U. J. "CLUSTER ALGORITHM SOLUTION OF SIGN AND COMPLEX ACTION PROBLEMS." International Journal of Modern Physics B 17, no. 28 (2003): 5435–47. http://dx.doi.org/10.1142/s0217979203020545.

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Numerical simulations of numerous quantum systems suffer from notorious sign or complex action problems. In such cases, the Boltzmann factors contributing to the path integral are in general not positive. As a consequence, standard Monte Carlo algorithms based on importance sampling fail. Meron-cluster algorithms realize a general strategy for solving sign problems by canceling explicitly all negative contributions. The remaining uncancelled positive contributions are then generated using importance sampling. The general nature of the sign problem is discussed and its solution with a meron-clu

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37

Schwager, Waldemar, and Ulrike Zeshan. "Word classes in sign languages." Parts of Speech: Descriptive tools, theoretical constructs 32, no. 3 (2008): 509–45. http://dx.doi.org/10.1075/sl.32.3.03sch.

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The topic of word classes remains curiously under-represented in the sign language literature due to many theoretical and methodological problems in sign linguistics. This article focuses on language-specific classifications of signs into word classes in two different sign languages: German Sign Language and Kata Kolok, the sign language of a village community in Bali. The article discusses semantic and structural criteria for identifying word classes in the target sign languages. On the basis of a data set of signs, these criteria are systematically tested out as a first step towards an induc

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38

Li, Zi-Xiang, and Hong Yao. "Sign-Problem-Free Fermionic Quantum Monte Carlo: Developments and Applications." Annual Review of Condensed Matter Physics 10, no. 1 (2019): 337–56. http://dx.doi.org/10.1146/annurev-conmatphys-033117-054307.

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Reliable simulations of correlated quantum systems, including high-temperature superconductors and frustrated magnets, are increasingly desired nowadays to further our understanding of essential features in such systems. Quantum Monte Carlo (QMC) is a unique numerically exact and intrinsically unbiased method to simulate interacting quantum many-body systems. More importantly, when QMC simulations are free from the notorious fermion sign problem, they can reliably simulate interacting quantum models with large system size and low temperature to reveal low-energy physics such as spontaneously b

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39

Bun, Mark, Nikhil S. Mande, and Justin Thaler. "Sign-rank Can Increase under Intersection." ACM Transactions on Computation Theory 13, no. 4 (2021): 1–17. http://dx.doi.org/10.1145/3470863.

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The communication class UPP cc is a communication analog of the Turing Machine complexity class PP . It is characterized by a matrix-analytic complexity measure called sign-rank (also called dimension complexity), and is essentially the most powerful communication class against which we know how to prove lower bounds. For a communication problem f , let f ∧ f denote the function that evaluates f on two disjoint inputs and outputs the AND of the results. We exhibit a communication problem f with UPP cc ( f ) = O (log n ), and UPP cc ( f ∧ f ) = Θ (log 2 n ). This is the first result showing tha

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40

Wattamwar, Aniket. "Sign Language Recognition using CNN." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (2021): 826–30. http://dx.doi.org/10.22214/ijraset.2021.38058.

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Abstract: This research work presents a prototype system that helps to recognize hand gesture to normal people in order to communicate more effectively with the special people. Aforesaid research work focuses on the problem of gesture recognition in real time that sign language used by the community of deaf people. The problem addressed is based on Digital Image Processing using CNN (Convolutional Neural Networks), Skin Detection and Image Segmentation techniques. This system recognizes gestures of ASL (American Sign Language) including the alphabet and a subset of its words. Keywords: gesture

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41

Husslein, Thomas, Werner Fettes, and Ingo Morgenstern. "Comparison of Calculations for the Hubbard Model Obtained with Quantum-Monte-Carlo, Exact, and Stochastic Diagonalization." International Journal of Modern Physics C 08, no. 02 (1997): 397–415. http://dx.doi.org/10.1142/s0129183197000333.

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In this paper we compare numerical results for the ground state of the Hubbard model obtained by Quantum-Monte-Carlo simulations with results from exact and stochastic diagonalizations. We find good agreement for the ground state energy and superconducting correlations for both, the repulsive and attractive Hubbard model. Special emphasis lies on the superconducting correlations in the repulsive Hubbard model, where the small magnitude of the values obtained by Monte-Carlo simulations gives rise to the question, whether these results might be caused by fluctuations or systematic errors of the

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42

Long, Yuhua, and Baoling Zeng. "Sign-Changing Solutions for Discrete Dirichlet Boundary Value Problem." Journal of Applied Mathematics and Physics 05, no. 11 (2017): 2228–43. http://dx.doi.org/10.4236/jamp.2017.511182.

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43

Qian, Aixia, and Shujie Li. "Multiple sign-changing solutions of an elliptic eigenvalue problem." Discrete & Continuous Dynamical Systems - A 12, no. 4 (2005): 737–46. http://dx.doi.org/10.3934/dcds.2005.12.737.

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44

Novoselov, Victor. "The Problem of the Sign in Philosophy of Postmodernism." International Journal of Philosophy 2, no. 3 (2014): 31. http://dx.doi.org/10.11648/j.ijp.20140203.11.

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45

Ringel, Zohar, and Dmitry L. Kovrizhin. "Quantized gravitational responses, the sign problem, and quantum complexity." Science Advances 3, no. 9 (2017): e1701758. http://dx.doi.org/10.1126/sciadv.1701758.

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46

Samson, J. H. "Classical effective Hamiltonians, Wigner functions, and the sign problem." Physical Review B 51, no. 1 (1995): 223–33. http://dx.doi.org/10.1103/physrevb.51.223.

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47

de Forcrand, P. "Improving the sign problem in QCD at finite density." Nuclear Physics B - Proceedings Supplements 83-84, no. 1-3 (2000): 372–74. http://dx.doi.org/10.1016/s0920-5632(00)00316-9.

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48

de Forcrand, Ph, and V. Laliena. "Improving the sign problem in QCD at finite density." Nuclear Physics B - Proceedings Supplements 83-84 (April 2000): 372–74. http://dx.doi.org/10.1016/s0920-5632(00)91677-3.

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49

Sasaki, Takahiro, Hiroaki Kouno, and Masanobu Yahiro. "Meson mass and the sign problem at finite theta." Journal of Physics: Conference Series 432 (April 30, 2013): 012031. http://dx.doi.org/10.1088/1742-6596/432/1/012031.

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50

Jia, Lirui, Tianxin Cai, and Wenguang Zhai. "On the sign changes in a weighted divisor problem." Acta Arithmetica 178, no. 2 (2017): 135–52. http://dx.doi.org/10.4064/aa8464-2-2017.

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