Articles de revues : « Stringy instantons »

1

Brustein, Ram, et Burt A. Ovrut. « Stringy instantons ». Physics Letters B 309, n^o 1-2 (juillet 1993) : 45–52. http://dx.doi.org/10.1016/0370-2693(93)91501-d.

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2

Frau, M. « Stringy instantons and dualities ». Fortschritte der Physik 59, n^o 7-8 (7 mars 2011) : 683–89. http://dx.doi.org/10.1002/prop.201100022.

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Gorbunov, I. V., et A. A. Sharapov. « String with noncommutative world-sheet and stringy instantons ». Physics Letters B 531, n^o 3-4 (avril 2002) : 255–62. http://dx.doi.org/10.1016/s0370-2693(02)01500-9.

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4

Argurio, Riccardo, Matteo Bertolini, Gabriele Ferretti, Christoffer Petersson et Alberto Lerda. « Stringy instantons at orbifold singularities ». Journal of High Energy Physics 2007, n^o 06 (19 juin 2007) : 067. http://dx.doi.org/10.1088/1126-6708/2007/06/067.

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Aharony, Ofer, et Shamit Kachru. « Stringy instantons and cascading quivers ». Journal of High Energy Physics 2007, n^o 09 (18 septembre 2007) : 060. http://dx.doi.org/10.1088/1126-6708/2007/09/060.

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Amariti, Antonio, Luciano Girardello et Alberto Mariotti. « Stringy instantons as strong dynamics ». Journal of High Energy Physics 2008, n^o 11 (13 novembre 2008) : 041. http://dx.doi.org/10.1088/1126-6708/2008/11/041.

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Amariti, Antonio, Luciano Girardello et Alberto Mariotti. « Stringy instantons from Seiberg duality ». Nuclear Physics B - Proceedings Supplements 192-193 (juillet 2009) : 161–62. http://dx.doi.org/10.1016/j.nuclphysbps.2009.07.066.

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Distler, Jacques, et Shamit Kachru. « Quantum symmetries and stringy instantons ». Physics Letters B 336, n^o 3-4 (septembre 1994) : 368–75. http://dx.doi.org/10.1016/0370-2693(94)90547-9.

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9

Amariti, A., L. Girardello et A. Mariotti. « Stringy instantons from Seiberg duality ». Fortschritte der Physik 57, n^o 5-7 (28 avril 2009) : 478–84. http://dx.doi.org/10.1002/prop.200900055.

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Florea, Bogdan, Shamit Kachru, John McGreevy et Natalia Saulina. « Stringy instantons and quiver gauge theories ». Journal of High Energy Physics 2007, n^o 05 (8 mai 2007) : 024. http://dx.doi.org/10.1088/1126-6708/2007/05/024.

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Petersson, Christoffer. « Superpotentials from stringy instantons without orientifolds ». Journal of High Energy Physics 2008, n^o 05 (21 mai 2008) : 078. http://dx.doi.org/10.1088/1126-6708/2008/05/078.

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12

Condeescu, C. « Stringy instantons and magnetized brane models ». Fortschritte der Physik 58, n^o 7-9 (19 février 2010) : 875–78. http://dx.doi.org/10.1002/prop.201000020.

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13

Addazi, Andrea. « More about neutron Majorana mass from exotic instantons : An alternative mechanism in low-scale string theory ». Modern Physics Letters A 31, n^o 17 (7 juin 2016) : 1650109. http://dx.doi.org/10.1142/s0217732316501091.

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We discuss an alternative for baryon-violating six quarks transition in the context of low scale string theory. In particular, with M[Formula: see text] = 10–103 TeV, such a transition can be mediated by two color-triplets through a quartic coupling with down-quarks, generated by exotic instantons, in a calculable and controllable way. We show how flavor-changing neutral currents (FCNCs) limits on color-triplet mass are well compatible with [Formula: see text] oscillation ones. If an [Formula: see text] transition was found, this would be an indirect hint for our model. This would strongly motivate searches for direct channels in proton–proton colliders. In fact, our model can be directly tested in an experimentally challenging 100–1000 TeV proton–proton collider, searching for our desired color-triplet states and an evidence for exotic instantons resonances, in addition to stringy Regge resonances, anomalous Z[Formula: see text]-bosons and gauged megaxion. In particular, our scenario can be related to the 750 GeV diphoton hint identifying it with the gauged megaxion dual to the B-field. On the other hand, this scenario is compatible with TeV-ish color triplets visible at large hadron collider (LHC) and with 1–10 TeV string scale, i.e. stringy resonances at LHC.

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14

Brustein, Ram, et Burt A. Ovrut. « Nonperturbative Effects in 2D String Theory or, Beyond the Liouville Wall ». International Journal of Modern Physics A 12, n^o 20 (10 août 1997) : 3477–515. http://dx.doi.org/10.1142/s0217751x9700181x.

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We discuss continuous and discrete sectors in the collective field theory of D = 1 matrix models. A canonical Lorentz-invariant field theory extension of collective field theory is presented and its classical solutions in Euclidean and Minkowski space are found. We show that the discrete, low density sector of collective field theory includes single eigenvalue Euclidean instantons which tunnel between different vacua of the extended theory. We further show that these "stringy" instantons induce nonperturbative effective operators of strength [Formula: see text] in the extended theory. The relationship of the world sheet description of string theory and Liouville theory to the effective space–time theory is explained. We also comment on the role of the discrete, low density, sector of collective field theory in that framework.

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15

Kiritsis, Elias, Michael Lennek et Bert Schellekens. « orientifolds, Yukawa couplings, stringy instantons and proton decay ». Nuclear Physics B 829, n^o 1-2 (avril 2010) : 298–324. http://dx.doi.org/10.1016/j.nuclphysb.2009.12.012.

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16

MAVROMATOS, NICK E., SARBEN SARKAR et WALTER TARANTINO. « CONDENSATE STRUCTURE OF D-BRANE DEFECT INDUCED FLAVOR VACUUM ». Modern Physics Letters A 28, n^o 11 (10 avril 2013) : 1350045. http://dx.doi.org/10.1142/s0217732313500454.

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It is argued that four-Fermi interactions induced by non-perturbative effects due to scattering of stringy matter from D-particles, D-instantons and more generally bulk gauge fields in brane models with large extra dimensions have, in specific situations, condensate structure described by flavor vacua.

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17

Ibáñez, L. E., et R. Richter. « Stringy instantons and Yukawa couplings in MSSM-like orientifold models ». Journal of High Energy Physics 2009, n^o 03 (13 mars 2009) : 090. http://dx.doi.org/10.1088/1126-6708/2009/03/090.

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18

NITTA, MUNETO. « KNOTTED INSTANTONS FROM ANNIHILATIONS OF MONOPOLE–INSTANTON COMPLEX ». International Journal of Modern Physics A 28, n^o 32 (30 décembre 2013) : 1350172. http://dx.doi.org/10.1142/s0217751x13501728.

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Monopoles and instantons are sheets (membranes) and strings in d = 5+1 dimension, respectively, and instanton strings can terminate on monopole sheets. We consider a pair of monopole and antimonopole sheets which is unstable to decay and results in a creation of closed instanton strings. We show that when an instanton string is stretched between the monopole sheets, there remains a new topological soliton of codimension five after the pair annihilation, i.e. a twisted closed instanton string or a knotted instanton.

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19

BIANCHI, MASSIMO, et MARINE SAMSONYAN. « NOTES ON UNORIENTED D-BRANE INSTANTONS ». International Journal of Modern Physics A 24, n^o 31 (20 décembre 2009) : 5737–63. http://dx.doi.org/10.1142/s0217751x09048022.

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We review basic aspects of worldsheet and penta-brane instantons as well as (unoriented) D-brane instantons, which is our main focus here, and threshold corrections to BPS-saturated couplings. We then consider nonperturbative superpotentials generated by "gauge" and "exotic" instantons living on D3-branes at orientifold singularities. Moreover, we discuss the interplay between worldsheet and D-string instantons on T4/Z2. We focus on a 4-Fermi amplitude, give Heterotic and perturbative Type I descriptions, and offer a multi-D-string instanton interpretation. We conclude with possible interesting developments.

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20

Bischoff, Jan, et Olaf Lechtenfeld. « Path-Integral Quantization of the (2,2) String ». International Journal of Modern Physics A 12, n^o 27 (30 octobre 1997) : 4933–71. http://dx.doi.org/10.1142/s0217751x97002632.

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A complete treatment of the (2,2) NSR string in flat (2 + 2)-dimensional space–time is given, from the formal path integral over N = 2 super Riemann surfaces to the computational recipe for amplitudes at any loop or gauge instanton number. We perform in detail the superconformal gauge fixing, discuss the spectral flow, and analyze the supermoduli space with emphasis on the gauge moduli. Background gauge field configurations in all instanton sectors are constructed. We develop chiral bosonization on punctured higher-genus surfaces in the presence of gauge moduli and instantons. The BRST cohomology is recapitulated, with a new space–time interpretation for picture-changing. We point out two ways of combining left- and right-movers, which lead to different three-point functions.

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21

LEONTARIS, G. K. « INSTANTON INDUCED CHARGED FERMION AND NEUTRINO MASSES IN A MINIMAL STANDARD MODEL SCENARIO FROM INTERSECTING D-BRANES ». International Journal of Modern Physics A 24, n^o 32 (30 décembre 2009) : 6035–49. http://dx.doi.org/10.1142/s0217751x09047351.

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String instanton Yukawa corrections from Euclidean D-branes are investigated in an effective Standard Model theory obtained from the minimal U (3)× U (2)× U (1) D-brane configuration. In the case of the minimal chiral and Higgs spectrum, it is found that superpotential contributions are induced by string instantons for the perturbatively forbidden entries of the up- and down-quark mass matrices. Analogous nonperturbative effects generate heavy Majorana neutrino masses and a Dirac neutrino texture with factorizable Yukawa couplings. For this latter case, a specific example is worked out where it is shown how this texture can reconcile the neutrino data.

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22

Billó, Marco, Pietro Fré, Riccardo D'auria, Sergio Ferrara, Paolo Soriani et Antoine Van Proeyen. « R Symmetry and the Topological Twist of N = 2 Effective Supergravities of Heterotic Strings ». International Journal of Modern Physics A 12, n^o 02 (20 janvier 1997) : 379–418. http://dx.doi.org/10.1142/s0217751x97000475.

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We discuss R symmetries in locally supersymmetric N = 2 gauge theories coupled to hypermultiplets which can be thought of as effective theories of heterotic superstring models. In this type of supergravities a suitable R symmetry exists and can be used to topologically twist the theory: the vector multiplet containing the dilaton–axion field has different R charge assignments with respect to the other vector multiplets. Correspondingly a system of coupled instanton equations emerges, mixing gravitational and Yang–Mills instantons with triholomorphic hyperinstantons and axion instantons. For the tree level classical special manifolds ST(n) = SU(1,1)/U(1) × SO(2,n)/[SO(2) × SO(n)], R symmetry with the specified properties is a continuous symmetry, but for the quantum-corrected manifolds [Formula: see text] a discrete R group of electric–magnetic duality rotations is sufficient and we argue that it exists.

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23

CURIO, GOTTFRIED. « SUPERPOTENTIAL OF THE M-THEORY CONIFOLD AND TYPE IIA STRING THEORY ». International Journal of Modern Physics A 19, n^o 04 (10 février 2004) : 521–55. http://dx.doi.org/10.1142/s0217751x04017720.

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The membrane instanton superpotential for M-theory on the G2 holonomy manifold given by the cone on S3×S3 is given by the dilogarithm and has Heisenberg monodromy group in the quantum moduli space. We compare this to a Heisenberg group action on the type IIA hypermultiplet moduli space for the universal hypermultiplet, to metric corrections from membrane instantons related to a twisted dilogarithm for the deformed conifold and to a flat bundle related to a conifold period, the Heisenberg group and the dilogarithm appearing in five-dimensional Seiberg/Witten theory.

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24

SENGUPTA, SOUMITRA, et PARTHASARATHI MAJUMDAR. « STRINGY EFFECTS ON SUPERSYMMETRY BREAKING IN LOW ENERGY SUPERGRAVITY THEORIES ». International Journal of Modern Physics A 06, n^o 01 (10 janvier 1991) : 41–58. http://dx.doi.org/10.1142/s0217751x91000046.

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The possibility of soft supersymmetry breaking at the tree level of string-inspired low energy supergravity theory is investigated. It is shown that the stringy quantum effects like the world sheet instanton and string loop effects can induce soft supersymmetry breakings at the tree level of the observable sector. Generic mass terms and trilinear soft breaking terms that arise are calculated.

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25

KATO, NORIJI, et IKUO SENDA. « PHASE TRANSITION DUE TO NON-CONTRACTIBLE LOOP IN HETEROTIC STRING D<10 ». International Journal of Modern Physics A 05, n^o 04 (20 février 1990) : 771–87. http://dx.doi.org/10.1142/s0217751x90000350.

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The heterotic string of the uncompactified dimensions less than ten, D<10, without space-time supersymmetry is considered. The states which have excitations only in the instanton sectors appear in the spectrum. These states become tachyonic below or above a certain scale of the compactified space and make the vacuum unstable. These phenomena are understood as phase transitions due to noncontractible loop on the compactified space. The investigation into the effective potential tells that the phase transition is of first order. The properties of the new phase are studied both in the field theoretic and the stringy manners. The heterotic string at finite temperature in D<10 is also discussed.

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26

Lugo, Adrián R. « SO(3)×U(1) Isometric Instantons with Non-Abelian Hair in Four-Dimensional String Theory ». Modern Physics Letters A 12, n^o 25 (20 août 1997) : 1847–58. http://dx.doi.org/10.1142/s0217732397001886.

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We compute the exact effective string vacuum backgrounds of the level k=81/19 SU(2,1)/U(1) coset model. A compact SU(2) isometry present in this seven-dimensional solution allows one to interpret it after compactification as a four-dimensional non-Abelian SU(2) charged instanton with a singular submanifold and an SO(3) × U(1) isometry. The semiclassical backgrounds, solutions of the type II strings, present similar characteristics

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27

CHERKIS, SERGEY A. « PERIODIC MONOPOLES IN STRING THEORY ». International Journal of Modern Physics A 16, supp01c (septembre 2001) : 970–74. http://dx.doi.org/10.1142/s0217751x01008631.

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Periodic solutions of Bogomolny equation have novel Gravitational Instantons as their moduli spaces. String theory allows to identify these moduli spaces with moduli spaces of Hitchin systems as well as with Coulomb branches of Seiberg-Witten gauge theories on a space with one compact direction. We classify these Gravitatial Instantons. We also perform Nahm transform of Periodic Monopoles establishing the correspondence with Hitchin systems predicted by String Theory.

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28

Frau, M., et A. Lerda. « Gauge instantons from open strings ». Fortschritte der Physik 52, n^o 67 (1 juin 2004) : 606–11. http://dx.doi.org/10.1002/prop.200410151.

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29

Witten, Edward. « Small instantons in string theory ». Nuclear Physics B 460, n^o 3 (février 1996) : 541–59. http://dx.doi.org/10.1016/0550-3213(95)00625-7.

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30

Billó, Marco, Marialuisa Frau, Igor Pesando, Francesco Fucito, Alberto Lerda et Antonella Liccardo. « Classical gauge instantons from open strings ». Journal of High Energy Physics 2003, n^o 02 (20 février 2003) : 045. http://dx.doi.org/10.1088/1126-6708/2003/02/045.

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31

Green, Michael B., et Pierre Vanhove. « D-instantons, strings and M-theory ». Physics Letters B 408, n^o 1-4 (septembre 1997) : 122–34. http://dx.doi.org/10.1016/s0370-2693(97)00785-5.

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32

Szabo, Richard J. « Instantons, Topological Strings, and Enumerative Geometry ». Advances in Mathematical Physics 2010 (2010) : 1–70. http://dx.doi.org/10.1155/2010/107857.

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We review and elaborate on certain aspects of the connections between instanton counting in maximally supersymmetric gauge theories and the computation of enumerative invariants of smooth varieties. We study in detail three instances of gauge theories in six, four, and two dimensions which naturally arise in the context of topological string theory on certain noncompact threefolds. We describe how the instanton counting in these gauge theories is related to the computation of the entropy of supersymmetric black holes and how these results are related to wall-crossing properties of enumerative invariants such as Donaldson-Thomas and Gromov-Witten invariants. Some features of moduli spaces of torsion-free sheaves and the computation of their Euler characteristics are also elucidated.

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33

Halmagyi, Nick, Ilarion V. Melnikov et Savdeep Sethi. « Instantons, hypermultiplets and the heterotic string ». Journal of High Energy Physics 2007, n^o 07 (31 juillet 2007) : 086. http://dx.doi.org/10.1088/1126-6708/2007/07/086.

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34

Saffin, P. M., Anupam Mazumdar et E. J. Copeland. « Instantons from low energy string actions ». Physics Letters B 435, n^o 1-2 (septembre 1998) : 19–24. http://dx.doi.org/10.1016/s0370-2693(98)00797-7.

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35

Faulkner, Thomas, et Hong Liu. « Meson widths from string worldsheet instantons ». Physics Letters B 673, n^o 2 (mars 2009) : 161–65. http://dx.doi.org/10.1016/j.physletb.2009.01.071.

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36

Cámara, P. G., E. Dudas, T. Maillard et G. Pradisi. « String instantons, fluxes and moduli stabilization ». Nuclear Physics B 795, n^o 1-2 (mai 2008) : 453–89. http://dx.doi.org/10.1016/j.nuclphysb.2007.11.026.

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37

Robertson, G. D. « Torus knots are rigid string instantons ». Physics Letters B 226, n^o 3-4 (août 1989) : 244–50. http://dx.doi.org/10.1016/0370-2693(89)91189-1.

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38

Pawełczyk, Jacek. « New rigid string instantons in R4 ». Physics Letters B 387, n^o 2 (octobre 1996) : 287–93. http://dx.doi.org/10.1016/0370-2693(96)01041-6.

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39

Bianchi, M., F. Fucito, G. C. Rossi et M. Martellini. « ALE instantons in string effective theory ». Nuclear Physics B 440, n^o 1-2 (avril 1995) : 129–70. http://dx.doi.org/10.1016/0550-3213(94)00552-p.

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40

Englert, Frangois, Laurent Houart et Paul Windey. « Black hole entropy and string instantons ». Nuclear Physics B 458, n^o 1-2 (janvier 1996) : 231–48. http://dx.doi.org/10.1016/0550-3213(95)00554-4.

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41

Diaconescu, D. E., B. Florea et A. Grassi. « Geometric transitions and open string instantons ». Advances in Theoretical and Mathematical Physics 6, n^o 4 (2002) : 619–42. http://dx.doi.org/10.4310/atmp.2002.v6.n4.a2.

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42

Khuri, Ramzi R. « Monopoles and instantons in string theory ». Physical Review D 46, n^o 10 (15 novembre 1992) : 4526–32. http://dx.doi.org/10.1103/physrevd.46.4526.

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43

FIORE, R., D. GALEAZZI, L. MASPERI et A. MEGEVAND. « STRINGS AND NON-TOPOLOGICAL SOLITONS ». Modern Physics Letters A 09, n^o 06 (28 février 1994) : 557–68. http://dx.doi.org/10.1142/s0217732394003798.

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We have numerically calculated topological and non-topological solitons in two spatial dimensions with Chern-Simons term. Their quantum stability, as well as that of the Maxwell vortex, is analyzed by means of bounce instantons which involve three-dimensional strings and non-topological solitons.

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44

Buchbinder, Evgeny I., Burt A. Ovrut et Rene Reinbacher. « Instanton moduli in string theory ». Journal of High Energy Physics 2005, n^o 04 (27 avril 2005) : 008. http://dx.doi.org/10.1088/1126-6708/2005/04/008.

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45

Behrndt, Klaus, Stefan Förste et Stefan Schwager. « Instanton effects in string cosmology ». Nuclear Physics B 508, n^o 1-2 (décembre 1997) : 391–408. http://dx.doi.org/10.1016/s0550-3213(97)80018-1.

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46

KEHAGIAS, A., et H. PARTOUCHE. « D-INSTANTON CORRECTIONS AS (p, q)-STRING EFFECTS AND NONRENORMALIZATION THEOREMS ». International Journal of Modern Physics A 13, n^o 29 (20 novembre 1998) : 5075–92. http://dx.doi.org/10.1142/s0217751x98002365.

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We discuss higher derivative interactions in the type IIB superstring in ten dimensions. From the fundamental stri ng point of view, the nonperturbative corrections are due to D-instantons. We argue that they can alternatively be understood as arising from (p, q)-strings. We derive a nonrenormalization theorem for eight-derivative bosonic interactions, which states that terms involving either NS–NS or R–R fields occur at tree-level and one-loop only. By using the SL(2, Z) symmetry of M theory on T2, we show that in order for the possible R3m+1 (m = 1, 2, …) interactions in M theory to have a consistent perturbative expansion in nine dimensions, m must be odd. Thus, only R6N+4 (N = 0,1, …) terms can be present in M theory and their string theory counterparts arise at N and 2N + 1 loops. Finally, we treat an example of fermionic term.

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47

Aganagic, Mina, Albrecht Klemm et Cumrun Vafa. « Disk Instantons, Mirror Symmetry and the Duality Web ». Zeitschrift für Naturforschung A 57, n^o 1-2 (1 février 2002) : 1–28. http://dx.doi.org/10.1515/zna-2002-1-201.

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We apply the methods recently developed for computation of type IIA disk instantons using mirror symmetry to a large class of D-branes wrapped over Lagrangian cycles of non-compact Calabi-Yau 3-folds. Along the way we clarify the notion of “flat coordinates” for the boundary theory. We also discover an integer IR ambiguity needed to define the quantum theory of D-branes wrapped over non-compact Lagrangian submanifolds. In the large N dual Chern-Simons theory, this ambiguity is mapped to the UV choice of the framing of the knot. In a type IIB dual description involving (p; q) 5-branes, disk instantons of type IIA get mapped to (p; q) string instantons. The M-theory lift of these results lead to computation of superpotential terms generated by M2 brane instantons wrapped over 3-cycles of certain manifolds of G2 holonomy

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Aganagic, Mina, Albrecht Klemm et Cumrun Vafa. « Disk Instantons, Mirror Symmetry and the Duality Web ». Zeitschrift für Naturforschung A 57, n^o 9-10 (1 octobre 2002) : 1–28. http://dx.doi.org/10.1515/zna-2002-9-1001.

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AbstractWe apply the methods recently developed for computation of type IIA disk instantons using mirror symmetry to a large class of D-branes wrapped over Lagrangian cycles of non-compact Calabi-Yau 3-folds. Along the way we clarify the notion of “flat coordinates” for the boundary theory. We also discover an integer IR ambiguity needed to define the quantum theory of D-branes wrapped over non-compact Lagrangian submanifolds. In the large N dual Chern-Simons theory, this ambiguity is mapped to the UV choice of the framing of the knot. In a type IIB dual description involving (p; q) 5-branes, disk instantons of type IIA get mapped to (p; q) string instantons. The M-theory lift of these results lead to computation of superpotential terms generated by M2 brane instantons wrapped over 3-cycles of certain manifolds of G2 holonomy.

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49

Akerblom, Nikolas, Ralph Blumenhagen, Dieter Lüst, Erik Plauschinn et Maximilian Schmidt-Sommerfeld. « Non-perturbative SQCD superpotentials from string instantons ». Journal of High Energy Physics 2007, n^o 04 (24 avril 2007) : 076. http://dx.doi.org/10.1088/1126-6708/2007/04/076.

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Schubert, Christian, et Alessandro Torrielli. « Open string pair creation from worldsheet instantons ». Journal of Physics A : Mathematical and Theoretical 43, n^o 40 (9 septembre 2010) : 402003. http://dx.doi.org/10.1088/1751-8113/43/40/402003.

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Articles de revues sur le sujet « Stringy instantons »

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