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Artykuły w czasopismach na temat "IIB compactification":
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LAVRINENKO, I. V., H. LÜ, C. N. POPE i T. A. TRAN. "U DUALITY AS GENERAL COORDINATE TRANSFORMATIONS, AND SPACE–TIME GEOMETRY". International Journal of Modern Physics A 14, nr 31 (20.12.1999): 4915–42. http://dx.doi.org/10.1142/s0217751x99002323.
We show that the full global symmetry groups of all the D-dimensional maximal supergravities can be described in terms of the closure of the internal general coordinate transformations of the toroidal compactifications of D=11 supergravity and of type IIB supergravity, with type IIA/IIB T duality providing an intertwining between the two pictures. At the quantum level, the part of the U duality group that corresponds to the surviving discretized internal general coordinate transformations in a given picture leaves the internal torus invariant, while the part that is not described by internal general coordinate transformations can have the effect of altering the size or shape of the internal torus. For example, M theory compactified on a large torus Tn can be related by duality to a compactification on a small torus, if and only if n≥3. We also discuss related issues in the toroidal compactification of the self-dual string to D=4. An appendix includes the complete results for the toroidal reduction of the bosonic sector of type IIB supergravity to arbitrary dimensions D≥3.
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DAI, JIN, R. G. LEIGH i JOSEPH POLCHINSKI. "NEW CONNECTIONS BETWEEN STRING THEORIES". Modern Physics Letters A 04, nr 21 (20.10.1989): 2073–83. http://dx.doi.org/10.1142/s0217732389002331.
We consider the R→0 limit of toroidal compactification in various string theories. This leads to new connections between seemingly different string theories: IIA and IIB, open and closed, oriented and unoriented. We also find two new extended objects which can couple consistently to strings: the Dirichlet-brane and the orientifold plane.
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Belhaj, A., M. Bensed, Z. Benslimane, M. B. Sedra i A. Segui. "Qubit and fermionic Fock spaces from type II superstring black holes". International Journal of Geometric Methods in Modern Physics 14, nr 06 (4.05.2017): 1750087. http://dx.doi.org/10.1142/s0219887817500876.
Using Hodge diagram combinatorial data, we study qubit and fermionic Fock spaces from the point of view of type II superstring black holes based on complex compactifications. Concretely, we establish a one-to-one correspondence between qubits, fermionic spaces and extremal black holes in maximally supersymmetric supergravity obtained from type II superstring on complex toroidal and Calabi–Yau compactifications. We interpret the differential forms of the [Formula: see text]-dimensional complex toroidal compactification as states of [Formula: see text]-qubits encoding information on extremal black hole charges. We show that there are [Formula: see text] copies of [Formula: see text] qubit systems which can be split as [Formula: see text]. More precisely, [Formula: see text] copies are associated with even [Formula: see text]-brane charges in type IIA superstring and the other [Formula: see text] ones correspond to odd [Formula: see text]-brane charges in IIB superstring. This correspondence is generalized to a class of Calabi–Yau manifolds. In connection with black hole charges in type IIA superstring, an [Formula: see text]-qubit system has been obtained from a canonical line bundle of [Formula: see text] factors of one-dimensional projective space [Formula: see text]
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Antoniadis, Ignatios, Yifan Chen i George K. Leontaris. "Inflation from the internal volume in type IIB/F-theory compactification". International Journal of Modern Physics A 34, nr 08 (20.03.2019): 1950042. http://dx.doi.org/10.1142/s0217751x19500428.
We study the cosmological inflation within a recently proposed framework of perturbative moduli stabilization in type IIB/F-theory compactifications on Calabi–Yau threefolds. The stabilization mechanism utilizes three stacks of magnetized 7-branes and relies on perturbative corrections to the Kähler potential that grow logarithmically in the transverse sizes of co-dimension two due to local tadpoles of closed string states in the bulk. The inflaton is the Kähler modulus associated with the internal compactification volume that starts rolling down the scalar potential from an initial condition around its maximum. Although the parameter space allows moduli stabilization in de Sitter space, the resulting number of e-foldings is too low. An extra uplifting source of the vacuum energy is then required to achieve phenomenologically viable inflation and a positive (although tiny) vacuum energy at the minimum. We discuss a class of uplifting potentials arising from strongly coupled matter fields. In a particular case, they reproduce the effect of the new Fayet–Iliopoulos term recently discussed in a supergravity context, that can be written for a non-R-symmetry U(1) and is gauge invariant at the Lagrangian level.
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Pilch, Krzysztof, i Nicholas P. Warner. "A new supersymmetric compactification of chiral IIB supergravity". Physics Letters B 487, nr 1-2 (sierpień 2000): 22–29. http://dx.doi.org/10.1016/s0370-2693(00)00796-6.
Maharana, Jnanadeva. "S-duality and compactification of type IIB superstring action". Physics Letters B 402, nr 1-2 (czerwiec 1997): 64–70. http://dx.doi.org/10.1016/s0370-2693(97)00444-9.
MOHRI, KENJI. "F THEORY VACUA IN FOUR DIMENSIONS AND TORIC THREEFOLDS". International Journal of Modern Physics A 14, nr 06 (10.03.1999): 845–74. http://dx.doi.org/10.1142/s0217751x99000415.
We investigate D=4, N=1 F theory models realized by type IIB string compactification on toric threefolds. Massless spectra, gauge symmetries, phase transitions associated with divisor contractions and flops, and nonperturbative superpotentials are analyzed using elementary toric methods.
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KONISHI, EIJI, i JNANADEVA MAHARANA. "COMPACTIFICATION OF TYPE IIB THEORY WITH FLUXES AND AXION–DILATON STRING COSMOLOGY". International Journal of Modern Physics A 25, nr 18n19 (30.07.2010): 3797–816. http://dx.doi.org/10.1142/s0217751x10050111.
Compactification of type IIB theory on torus, in the presence of fluxes, is considered. The reduced effective action is expressed in manifestly S-duality invariant form. Cosmological solutions of the model are discussed in several cases in the Pre-Big Bang scenario.
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Böhm, Robert, Holger Günther, Carl Herrmann i Jan Louis. "Compactification of type IIB string theory on Calabi–Yau threefolds". Nuclear Physics B 569, nr 1-3 (marzec 2000): 229–46. http://dx.doi.org/10.1016/s0550-3213(99)00796-8.
Khalil, Shaaban, Ahmad Moursy i Ali Nassar. "Aspects of Moduli Stabilization in Type IIB String Theory". Advances in High Energy Physics 2016 (2016): 1–17. http://dx.doi.org/10.1155/2016/4303752.
We review moduli stabilization in type IIB string theory compactification with fluxes. We focus on KKLT and Large Volume Scenario (LVS). We show that the predicted soft SUSY breaking terms in KKLT model are not phenomenological viable. In LVS, the following result for scalar mass, gaugino mass, and trilinear term is obtained:m0=m1/2=-A0=m3/2, which may account for Higgs mass limit ifm3/2~O(1.5) TeV. However, in this case, the relic abundance of the lightest neutralino cannot be consistent with the measured limits. We also study the cosmological consequences of moduli stabilization in both models. In particular, the associated inflation models such as racetrack inflation and Kähler inflation are analyzed. Finally, the problem of moduli destabilization and the effect of string moduli backreaction on the inflation models are discussed.
Rozprawy doktorskie na temat "IIB compactification":
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Escoda, Cristina. "On type IIB flux compactification and inflation". Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612006.
In the present thesis, we offer an introduction to type IIB string compactifications on $\mathbb{T}^{d}/\Gamma$ toroidal orbifolds. We first describe the technical method to construct these spaces and reduce the string background on it. We will have (non)-geometrical fluxes arising from these spaces which decorate with discrete deformations our four $\mathcal{N}=1$ dimensional supergravity theory. Solving its equations of motion, we find several families of supersymmetric AdS vacua with fixed moduli, which can be related through a set of $SL(2,\mathbb{Z})$ symmetries.
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Daniel, Panizo. "Review of compact spaces for type IIA/IIB theories and generalised fluxes". Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-384227.
In the present project we study compactifications of type IIA/IIB string theories on toroidal orbifolds. We present the moduli space for N=1 four-dimensional reductions and its topological properties. To fix the value of all moduli, we will construct the most general holomorphic superpotential W using a set of T-dual iterations for the fluxes. Using a 3-torus toy-model, we will give an introductory description to the background of these generalised fluxes.
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Witkowski, Lukas Thomas. "Sequestering of Kähler moduli in type IIB string theory". Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:6f5c8a99-26ca-401b-ad42-7bd3bf873f80.
In this thesis we employ string perturbation theory in toroidal orbifold models to study aspects of supersymmetry breaking in type IIB string theory. First, we determine the dependence of physical Yukawa couplings on blow-up moduli in models with D3-branes at orbifold singularities. Blow-up moduli are scalar fields describing the size of small blow-up cycles in the compactification geometry. In models implementing moduli stabilisation these fields can acquire F-terms and break supersymmetry. We examine the moduli-dependence of physical Yukawa couplings at string tree-level by computing disk correlation functions involving a Yukawa interaction of visible sector fields and an arbitrary number of blow-up moduli. We perform the calculation for one blow-up insertion explicitly and find that the correlation function vanishes if the blow-up modulus is associated with a small cycle distant to the visible sector. For more than one blow-up insertion we show that all such correlation functions are exponentially suppressed by the compactification volume. We explain how these results are relevant to suppressing soft terms to scales parametrically below the gravitino mass. Further, we determine corrections to holomorphic Yukawa couplings on D3-branes at an orbifold singularity due to non-perturbative effects such as gaugino condensation on a stack of D7-branes. This can be done by calculating a one-loop threshold correction to the gauge coupling on the D7-branes. We show that, if present, the new contributions to Yukawa couplings are not aligned with the tree-level couplings. As the new Yukawa couplings contribute to soft A-terms they are sources of flavour-changing neutral currents. Last we discuss an effect unrelated to supersymmetry breaking. We show that orbifold models with D3-branes at orbifold singularities can exhibit kinetic mixing of different massless Abelian factors. For this to be possible, the relevant U(1) factors have to be associated with more than one orbifold singularity.
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Pajer, Enrico. "Phenomenological aspects of type IIB flux compactifications". Diss., kostenfrei, 2008. http://edoc.ub.uni-muenchen.de/8956/.
Bollan, Nicole Edmea. "General analysis of moduli stabilization in type IIB string compactifications". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13498/.
In the context of type IIB superstring flux-compactifications on Calabi Yau orientifolds, stabilizing the Kähler moduli is crucially challenging due to the tree-level protection arising from the so-called "No-scale structure". The breaking of this no-scale effective symmetry is paramount within the process of moduli stabilization; this work is aimed at studying the ways of a controlled breaking of this effective symmetry using some sub-leading effects such as perturbative α′-corrections to the Kähler potential and non-perturbative effects to the superpotential. The same have led to three attractive and well-established schemes for moduli stabilization, namely the KKLT scheme, the racetrack scheme and the Large Volume Scenarios (LVS) scheme. The main goal for the present work is twofold; first to study the scalar potential for closed-string moduli in a quite model-independent way which will subsequently enable to understand some interesting features of the no-scale structure breaking, second, to provide a unified framework for the above mentioned three well-known schemes for moduli stabilization. Our generic approach not only helps in directly reading-off the scalar potentials of these schemes via merely knowing some topo- logical data (such as intersection numbers) of the compactifying Calabi Yau, but being generic it also provides the hope both for some useful extensions of these schemes and for the possibility of finding a new moduli stabilization scheme, e.g. using odd moduli. Moreover, this approach might ultimately lead to performing a model independent analysis for moduli stabilization, for example via creating the possibility of finding some general conditions for the existence of stable de-Sitter vacua for arbitrary compactifcations, as would be highly desirable.
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Cicoli, Michele. "String loop moduli stabilisation and cosmology in IIB flux compactifications". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611500.
Gil, Pedro Francisco M. S. V. "On moduli stabilisation and cosmology in type IIB flux compactifications". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:6c3ef85d-df3b-42c6-846d-a4bfdeec85de.
This Thesis studies some aspects of string compactifications with particular em- phasis on moduli stabilisation and cosmology. In Chapter 1 I motivate the study of string compactifications as a way to build on the successes of the Standard Model of Particle Physics and of the theory of General Relativity. Chapter 2 constitutes an overview of the technical background necessary for the study of flux compactifications. I sketch how the desire to obtain a supersymmet- ric theory in four dimensions constrains us to consider compactifications of the ten dimensional theory in six dimensional Calabi-Yau orientifolds. I argue that it is strictly necessary to stabilise the geometry of this compact space in order to have a phenomenologically viable four dimensional theory. I introduce the large volume scenario of type IIB compactifications that successfully incorporates fluxes and sub- leading corrections to yield a four dimensional theory with broken supersymmetry and all geometrical moduli stabilised. The next four Chapters are devoted to the study of some phenomenological aspects of moduli stabilisation and constitute the original work developed for this Thesis. In Chapter 3 I investigate the consequences of field redefinitions in the stabilisation of moduli and supersymmetry breaking, finding that redefinitions of the small blow- up moduli do not significantly alter the standard picture of moduli stabilisation in the large volume scenario and that the soft supersymmetry breaking terms are generated at the scale of the gravitino mass. Chapter 4 deals with the putative destabilisation of the volume modulus by very dense objects. The analysis of the moduli potential shows that even the densest astrophysical objects cannot destabilise the moduli, and that destabilisation is only achievable in the context of black hole formation and cosmological singularities. In Chapter 5 I present a model of inflation within the large volume scenario. The inflaton is identified with a geometric modulus, the fibre modulus, and its potential generated by poly-instanton effects. The model is shown to be robust and consistent with current observational constraints. In Chapter 6 I introduce a model of quintessence, where the quintessence field and its potential share the same origin with the inflationary model of the previous Chapter. This model constitutes a stringy realisation of supersymmetric large extra dimensions, where supersymmetry, the low gravity scale and the scale of dark energy are intrinsically connected. I conclude in Chapter 7 outlining the direction of future research.
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Moster, Sebastian. "Applications of the D-Instanton Calculus in Type IIB Orientifold Compactifications". Diss., lmu, 2010. http://nbn-resolving.de/urn:nbn:de:bvb:19-117592.
Ferrara, S. "Effective Lagrangians for Superstring Compactifications". W The Superworld III, 77–123. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-8869-2_4.
Wang, Xiaochang. "On Compactifications of Decentralized Output Feedback Spaces". W Computation and Control II, 351–58. Boston, MA: Birkhäuser Boston, 1991. http://dx.doi.org/10.1007/978-1-4612-0427-5_23.
van Nieuwenhuizen, P. "The compactification of IIB supergravity on S5 revisited". W Strings, Gauge Fields, and the Geometry Behind, 133–57. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814412551_0005.
Powell, Mark, i Arunima Ray. "Gropes, Towers, and Skyscrapers". W The Disc Embedding Theorem, 171–84. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198841319.003.0012.
Gropes, towers, and skyscrapers are carefully defined. These are the objects that the rest of Part II studies and seeks to construct. All three are 4-manifolds with boundary, obtained from stacking thickened surfaces on top of one another. Gropes are constructed from thickened orientable surfaces with positive genus, each stage attached to a symplectic basis of curves for the homology of the previous stage. Towers have an additional type of stage obtained from plumbed thickened discs. A skyscraper is the endpoint compactification of an infinite tower. An introduction to endpoint compactifications is included. The notion of a good group is also defined.
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Grushevsky, Samuel, Klaus Hulek, Orsola Tommasi i Mathieu Dutour Sikirić. "Stable Betti Numbers of (Partial) Toroidal Compactifications of the Moduli Space of Abelian Varieties". W Geometry and Physics: Volume II, 581–610. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198802020.003.0024.
This chapter presents an algorithm for explicitly computing the number of generators of the stable cohomology algebra of any rationally smooth partial toroidal compactification of Ag, satisfying certain additivity and finiteness properties, in terms of the combinatorics of the corresponding toric fans. In particular, the algorithm determines the stable cohomology of the matroidal partial compactification, in terms of simple regular matroids that are irreducible with respect to the 1-sum operation, and their automorphism groups. The algorithm also applies to compute the stable Betti numbers in close to top degree for the perfect cone toroidal compactification. This suggests the existence of an algebra structure on the stable cohomology of the perfect cone compactification in close to top degree.
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"III.9 Compactness and Compactification". W The Princeton Companion to Mathematics, 167–69. Princeton University Press, 2010. http://dx.doi.org/10.1515/9781400830398.167.
de la Ossa, Xenia, Magdalena Larfors i Eirik E. Svanes. "Restrictions of Heterotic G2 Structures and Instanton Connections". W Geometry and Physics: Volume II, 503–18. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198802020.003.0020.
This chapter revisits recent results regarding the geometry and moduli of solutions of the heterotic string on manifolds Y with a G 2 structure. In particular, such heterotic G 2 systems can be rephrased in terms of a differential Ď acting on a complex Ωˇ∗(Y,Q), where Ωˇ=T∗Y⊕End(TY)⊕End(V), and Ď is an appropriate projection of an exterior covariant derivative D which satisfies an instanton condition. The infinitesimal moduli are further parametrized by the first cohomology HDˇ1(Y,Q). The chapter proceeds to restrict this system to manifolds X with an SU(3) structure corresponding to supersymmetric compactifications to four-dimensional Minkowski space, often referred to as Strominger–Hull solutions. In doing so, the chapter derives a new result: the Strominger–Hull system is equivalent to a particular holomorphic Yang–Mills covariant derivative on Q|X=T∗X⊕End(TX)⊕End(V).
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Galindo, Jorge, Salvador Hernández i Ta-Sun Wu. "Recent results and open questions relating Chu duality and Bohr compactifications of locally compact groups". W Open Problems in Topology II, 407–22. Elsevier, 2007. http://dx.doi.org/10.1016/b978-044452208-5/50042-9.
Streszczenia konferencji na temat "IIB compactification":
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Kaura, Payal, i Aalok Misra. "Attractor Behaviour of Non-Supersymmetric Black Holes for type IIB Compactification". W THEORETICAL HIGH ENERGY PHYSICS: International Workshop on Theoretical High Energy Physics. AIP, 2007. http://dx.doi.org/10.1063/1.2803802.
Papadoudis, Stratos, Konstantinos Anagnostopoulos, Takehiro Azuma, Yuta Ito i Jun Nishimura. "Dynamical compactification of extra dimensions in the Euclidean type IIB matrix model: A numerical study using the complex Langevin method". W Corfu Summer Institute 2018 "School and Workshops on Elementary Particle Physics and Gravity". Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.347.0065.
Font, Anamaría. "Duality symmetries in Calabi-Yau compactifications". W Proceedings of the XXVI International Conference on High Energy Physics. Vol. II. AIP, 1992. http://dx.doi.org/10.1063/1.43398.
Raporty organizacyjne na temat "IIB compactification":
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Kachru, S. Moduli Potentials in Type IIA Compactifications with RR and NS Flux. Office of Scientific and Technical Information (OSTI), grudzień 2004. http://dx.doi.org/10.2172/839798.
