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Artykuły w czasopismach na temat „String models”

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Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 5 marca 2023

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1

Gustafson, Gösta. "String models". Nuclear Physics A 566 (styczeń 1994): 233–44. http://dx.doi.org/10.1016/0375-9474(94)90629-7.

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2

Boulware, David G., i S. Deser. "String-Generated Gravity Models". Physical Review Letters 55, nr 24 (9.12.1985): 2656–60. http://dx.doi.org/10.1103/physrevlett.55.2656.

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3

Lawrence, Albion, i John McGreevy. "D-terms and D-strings in open string models". Journal of High Energy Physics 2004, nr 10 (23.10.2004): 056. http://dx.doi.org/10.1088/1126-6708/2004/10/056.

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4

RANDJBAR-DAEMI, S., ABDUS SALAM i J. A. STRATHDEE. "σ-MODELS AND STRING THEORIES". International Journal of Modern Physics A 02, nr 03 (czerwiec 1987): 667–93. http://dx.doi.org/10.1142/s0217751x87000247.

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The propagation of closed bosonic strings interacting with background gravitational and dilaton fields is reviewed. The string is treated as a quantum field theory on a compact 2-dimensional manifold. The question is posed as to how the conditions for the vanishing trace anomaly and the ensuing background field equations may depend on global features of the manifold. It is shown that to the leading order in σ-model perturbation theory the string loop effects do not modify the gravitational and the dilaton field equations. However for the purely bosonic strings new terms involving the modular parameter of the world sheet are induced by quantum effects which can be absorbed into a re-definition of the background fields. We also discuss some aspects of several regularization schemes such as dimensional, Pauli-Villars and the proper-time cut off in an appendix.

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5

Faraggi, A. E., E. Manno i C. Timirgaziu. "Minimal standard heterotic string models". European Physical Journal C 50, nr 3 (6.03.2007): 701–10. http://dx.doi.org/10.1140/epjc/s10052-007-0243-5.

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6

Nepomechie, Rafael I. "String models with twisted currents". Physical Review D 34, nr 4 (15.08.1986): 1129–35. http://dx.doi.org/10.1103/physrevd.34.1129.

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7

Bergman, Oren, i Charles B. Thorn. "String bit models for superstring". Physical Review D 52, nr 10 (15.11.1995): 5980–96. http://dx.doi.org/10.1103/physrevd.52.5980.

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8

Danilov, G. S., i L. N. Lipatov. "BFKL pomeron in string models". Nuclear Physics B 754, nr 1-2 (październik 2006): 187–232. http://dx.doi.org/10.1016/j.nuclphysb.2006.07.017.

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9

Moss de Oliveira, S., P. M. C. de Oliveira i D. Stauffer. "Bit-string models for parasex". Physica A: Statistical Mechanics and its Applications 322 (maj 2003): 521–30. http://dx.doi.org/10.1016/s0378-4371(02)01916-7.

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10

Constantin, Andrei, Yang-Hui He i Andre Lukas. "Counting string theory standard models". Physics Letters B 792 (maj 2019): 258–62. http://dx.doi.org/10.1016/j.physletb.2019.03.048.

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11

Yang, Z. "Compactified D=1 string models". Physics Letters B 243, nr 4 (lipiec 1990): 365–72. http://dx.doi.org/10.1016/0370-2693(90)91398-u.

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12

Lorenz-Petzold, D. "String-driven anisotropic cosmological models". Astrophysics and Space Science 155, nr 2 (1989): 335–39. http://dx.doi.org/10.1007/bf00643871.

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13

Curtright, T. L., G. I. Ghandour i C. B. Thorn. "Spin content of string models". Physics Letters B 182, nr 1 (grudzień 1986): 45–52. http://dx.doi.org/10.1016/0370-2693(86)91076-2.

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14

Lorenz-Petzold, D. "String-generated anisotropic cosmological models". Physics Letters B 197, nr 1-2 (październik 1987): 71–75. http://dx.doi.org/10.1016/0370-2693(87)90344-3.

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15

Bailin, David, i Alex Love. "String unification in orbifold models". Physics Letters B 278, nr 1-2 (marzec 1992): 125–30. http://dx.doi.org/10.1016/0370-2693(92)90722-g.

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16

Aoyama, S., P. Pasti i M. Tonin. "The GS and NRS heterotic strings from twistor-string models". Physics Letters B 283, nr 3-4 (czerwiec 1992): 213–17. http://dx.doi.org/10.1016/0370-2693(92)90010-2.

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17

Xia, Hui, Yi Hua Dou, Xin He Wang i Jiang Wen Xu. "Sectionalized Mechanical Models of Drilling Tool of Trenchless Directional Drilling". Applied Mechanics and Materials 268-270 (grudzień 2012): 1190–93. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1190.

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There are three working conditions namely drilling a guide hole, expanding the guide hole and pulling back pipeline in trenchless directional drilling. The position of drill string in the wellbore and loads exerted on the drill string varied in different working conditions. The models of buckling analysis of drill strings under compression, mechanical analysis of drill string under axial compression near drill bit in inclined straight section, mechanical analysis of drill string with multi-centralizers under axial compression near drill bit in inclined straight section, mechanical analysis of drill string near drill bit under axial compression in horizontal section, mechanical analysis of drill string near drill bit under axial tension in horizontal section, mechanical analysis of drill strings near drill bit under axial tension in inclined straight section and mechanical analysis of drill string in failed well are established based on the characteristic of loads and trajectories in each section. The establishment of sectionalized mechanical model of drilling tool is the fundament of further study of force analysis, deformation analysis and stress analysis.

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18

Kerkhof, Jeroen, i Antoon Pelsser. "Observational Equivalence of Discrete String Models and Market Models". Journal of Derivatives 10, nr 1 (31.08.2002): 55–61. http://dx.doi.org/10.3905/jod.2002.319190.

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19

Catenacci, Roberto, i Pietro Grassi. "String Sigma Models on Curved Supermanifolds". Universe 4, nr 4 (24.04.2018): 60. http://dx.doi.org/10.3390/universe4040060.

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20

Hernández, Francisco J., Francisco Nettel i Hernando Quevedo. "Gravitational fields as generalized string models". Gravitation and Cosmology 15, nr 2 (kwiecień 2009): 109–20. http://dx.doi.org/10.1134/s0202289309020029.

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21

Singh, G. P., i T. Singh. "String Cosmological Models with Magnetic Field". General Relativity and Gravitation 31, nr 3 (marzec 1999): 371–78. http://dx.doi.org/10.1023/a:1026644828215.

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22

Shabelski, Y. M., i M. G. Ryskin. "Tetraquarks and pentaquarks in string models". European Physical Journal C 50, nr 1 (3.02.2007): 81–83. http://dx.doi.org/10.1140/epjc/s10052-006-0207-1.

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23

Craps, Ben. "Big bang models in string theory". Classical and Quantum Gravity 23, nr 21 (4.10.2006): S849—S881. http://dx.doi.org/10.1088/0264-9381/23/21/s01.

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24

Berera, Arjun, i Thomas W. Kephart. "Ubiquitous Inflaton in String-Inspired Models". Physical Review Letters 83, nr 6 (9.08.1999): 1084–87. http://dx.doi.org/10.1103/physrevlett.83.1084.

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25

Kawai, H., D. C. Lewellen i S. H. H. Tye. "Classification of closed-fermionic-string models". Physical Review D 34, nr 12 (15.12.1986): 3794–804. http://dx.doi.org/10.1103/physrevd.34.3794.

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26

Anagnostopoulos, Konstantinos N., Jun Nishimura i Poul Olesen. "Noncommutative String Worldsheets from Matrix Models". Journal of High Energy Physics 2001, nr 04 (20.04.2001): 024. http://dx.doi.org/10.1088/1126-6708/2001/04/024.

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27

Momen, Arshad, i Carl Rosenzweig. "Deconfinement transition and flux-string models". Physical Review D 56, nr 3 (1.08.1997): 1437–44. http://dx.doi.org/10.1103/physrevd.56.1437.

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28

CVETIČ, MIRJAM, i PAUL LANGACKER. "NEW GAUGE BOSONS FROM STRING MODELS". Modern Physics Letters A 11, nr 15 (20.05.1996): 1247–62. http://dx.doi.org/10.1142/s0217732396001260.

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We address the mass ranges of new neutral gauge bosons and constraints on the accompanying exotic particles as predicted by a class of superstring models. Under certain assumptions about the supersymmetry breaking parameters we show that breaking of an additional U(1)′ symmetry is radiative when the appropriate Yukawa couplings of exotic particles are of order one, analogous to the radiative breaking of the electroweak symmetry in the supersymmetric standard model due to the large top-quark Yukawa coupling. Such large Yukawa couplings occur for a large class of string models. The Z′ and exotic masses are either of [Formula: see text], or of a scale intermediate between the string and electroweak scales. In the former case, [Formula: see text] may be achieved without excessive fine-tuning, and is within future experimental reach.

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29

Carter, Brandon, i Patrick Peter. "Supersonic string models for Witten vortices". Physical Review D 52, nr 4 (15.08.1995): R1744—R1748. http://dx.doi.org/10.1103/physrevd.52.r1744.

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30

Sagnotti, Augusto. "Open-string models with broken supersymmetry". Nuclear Physics B - Proceedings Supplements 88, nr 1-3 (czerwiec 2000): 160–67. http://dx.doi.org/10.1016/s0920-5632(00)00764-7.

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31

Bueno-Guerrero, Alberto, Manuel Moreno i Javier F. Navas. "Stochastic string models with continuous semimartingales". Physica A: Statistical Mechanics and its Applications 433 (wrzesień 2015): 229–46. http://dx.doi.org/10.1016/j.physa.2015.03.070.

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32

Adhav, K. S., M. V. Dawande i V. B. Raut. "Bianchi Type-III String Cosmological Models". International Journal of Theoretical Physics 48, nr 3 (16.09.2008): 700–705. http://dx.doi.org/10.1007/s10773-008-9846-3.

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33

Singh, J. K. "String Cosmological Models in Lyra Geometry". International Journal of Theoretical Physics 48, nr 3 (9.10.2008): 905–12. http://dx.doi.org/10.1007/s10773-008-9863-2.

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34

Ram, Shri, i J. K. Singh. "Some spatially homogeneous string cosmological models". General Relativity and Gravitation 27, nr 11 (listopad 1995): 1207–13. http://dx.doi.org/10.1007/bf02108233.

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35

Hořava, Petr. "Background duality of open-string models". Physics Letters B 231, nr 3 (listopad 1989): 251–57. http://dx.doi.org/10.1016/0370-2693(89)90209-8.

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36

Nahm, W. "A classification of open string models". Communications in Mathematical Physics 105, nr 1 (marzec 1986): 1–11. http://dx.doi.org/10.1007/bf01212338.

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37

Brustein, Ram, i Merav Hadad. "Particle production in string cosmology models". Physical Review D 57, nr 2 (15.01.1998): 725–40. http://dx.doi.org/10.1103/physrevd.57.725.

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38

Quevedo, Fernando. "Local string models and moduli stabilisation". Modern Physics Letters A 30, nr 07 (26.02.2015): 1530004. http://dx.doi.org/10.1142/s0217732315300049.

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A brief overview is presented of the progress made during the past few years on the general structure of local models of particle physics from string theory including: moduli stabilisation, supersymmetry breaking, global embedding in compact Calabi–Yau compactifications and potential cosmological implications. Type IIB D-brane constructions and the Large Volume Scenario (LVS) are discussed in some detail emphasising the recent achievements and the main open questions.

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39

VAFA, CUMRUN. "STRING VACUA AND ORBIFOLDIZED LG MODELS". Modern Physics Letters A 04, nr 12 (20.06.1989): 1169–85. http://dx.doi.org/10.1142/s0217732389001350.

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We investigate how string vacua arise from N=2 superconformal models. In particular, we discuss how Landau-Ginzburg models with appropriate central charge can be orbifol-dized to construct string vacua. We develop techniques to compute the degeneracy and quantum numbers of the ground states of the LG models in the twisted sectors, even for the cases where the underlying LG model is not exactly solvable. This allows us to compute some interesting physical quantities such as the number of generations and anti-generations in the simplest compactification scenarios. The results agree with explicit computations in the cases where LG model is exactly solvable.

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40

DUNBAR, DAVID C. "FERMIONIC STRING MODELS AND ZN ORBIFOLDS". Modern Physics Letters A 04, nr 24 (20.11.1989): 2339–47. http://dx.doi.org/10.1142/s021773238900263x.

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41

DEMETERFI, KREŠIMIR, i CHUNG-I. TAN. "STRING EQUATIONS FROM UNITARY MATRIX MODELS". Modern Physics Letters A 05, nr 20 (20.08.1990): 1563–74. http://dx.doi.org/10.1142/s0217732390001785.

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We investigate unitary matrix models in the scaling limit using the method of orthogonal polynomials on the unit circle. We show that, f or a certain choice of coupling constants, string equations belong to the same univesality class as equations obtained from Hermitian matrix models. In addition, we show how a new class of string equations emerges as a consequence of the compactness of the unitary groups.

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42

Sénéchal, David. "Search for four-dimensional string models". Physical Review D 39, nr 12 (15.06.1989): 3717–30. http://dx.doi.org/10.1103/physrevd.39.3717.

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43

Dine, Michael, i Nathan Seiberg. "Are (0, 2) models string miracles?" Nuclear Physics B 306, nr 1 (sierpień 1988): 137–59. http://dx.doi.org/10.1016/0550-3213(88)90174-5.

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44

Faraggi, A. E. "MSHSM - Minimal Standard Heterotic String Models". Fortschritte der Physik 58, nr 7-9 (19.02.2010): 733–37. http://dx.doi.org/10.1002/prop.201000012.

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45

Bars, Itzhak. "Heterotic string models in curved spacetime". Physics Letters B 293, nr 3-4 (październik 1992): 315–20. http://dx.doi.org/10.1016/0370-2693(92)90889-c.

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46

Andreev, Oleg. "String breaking in a cold wind as seen by string models". Nuclear Physics B 977 (kwiecień 2022): 115724. http://dx.doi.org/10.1016/j.nuclphysb.2022.115724.

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47

Bonelli, Giulio. "Matrix string models for exact (2,2) string theories in RR backgrounds". Nuclear Physics B 649, nr 1-2 (styczeń 2003): 130–42. http://dx.doi.org/10.1016/s0550-3213(02)01036-2.

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48

FILIPPOV, A. T., i A. P. ISAEV. "GAUGE MODELS OF “DISCRETE STRINGS”". Modern Physics Letters A 04, nr 22 (30.10.1989): 2167–76. http://dx.doi.org/10.1142/s0217732389002434.

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A new class of constrained hamiltonian systems with a finite number of degrees of freedom is proposed in which excitations can be divided into two groups analogous to the left and right movers of string theories. Some of these models can be regarded as discrete analogs of the bosonic string, and in the continuum limit with the infinite dimensional constraint algebra Vect (S1)⊗ Vect (S1) one can obtain the classical theory of closed bosonic strings. We also discuss the problem of quantizing these models and constructing the propagator by using path integral methods. A possibility of a supersymmetric extension of our models is also pointed out.

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49

JOHNSON, CLIFFORD V. "HETEROTIC COSET MODELS". Modern Physics Letters A 10, nr 07 (7.03.1995): 549–59. http://dx.doi.org/10.1142/s0217732395000582.

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A description is given on how to construct (0, 2) supersymmetric conformal field theories as coset models. These models may be used as non-trivial backgrounds for heterotic string theory. They are realized as a combination of an anomalously gauged Wess–Zumino–Witten model, right-moving supersymmetric fermions, and left-moving current algebra fermions. Requiring the sum of the gauge anomalies from the bosonic and fermionic sectors to cancel yields the final model. Applications discussed include exact models of extremal four-dimensional charged black holes and Taub–NUT solutions of string theory. These coset models may also be used to construct important families of (0, 2) supersymmetric heterotic string compactifications. The Kazama–Suzuki models are the left-right symmetric special case of these models.

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50

MINAHAN, JOSEPH A. "MATRIX MODELS AND ONE-DIMENSIONAL OPEN STRING THEORY". International Journal of Modern Physics A 08, nr 20 (10.08.1993): 3599–614. http://dx.doi.org/10.1142/s0217751x93001466.

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We propose a random matrix model as a representation for D = 1 open strings. We show that the model with one flavor of boundary fields is equivalent to N fermions with spin in a central potential that also includes a long-range ferromagnetic interaction between the fermions that falls off as 1/(rij)2. We also generalize this theory to contain an arbitrary number of flavors. For an appropriate choice of the matrix model potential the ground state of the system can be found. Using this potential, we calculate the free energy in the double scaling limit and show that the free energy expansion has the expected form for a theory of open and closed strings if the boundary field mass and couplings have a logarithmic divergence. We then examine the critical properties of this theory and show that the length of the boundary around a hole remains finite, even near the critical point. We also argue that unlike critical string theory or a D = 0 theory, the open string coupling constant is a free parameter.

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