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  • 1.
    Braun, Andreas P.
    et al.
    Univ Oxford, Math Inst, Woodstock Rd, Oxford OX2 6GG, England.
    Del Zotto, Michele
    SUNY Stony Brook, Simons Ctr Geometry & Phys, Stony Brook, NY 11794 USA.
    Halverson, James
    Northeastern Univ, Dept Phys, Boston, MA 02115 USA.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Morrison, David R.
    Univ Calif Santa Barbara, Dept Math, Santa Barbara, CA 93106 USA.
    Schafer-Nameki, Sakura
    Univ Oxford, Math Inst, Woodstock Rd, Oxford OX2 6GG, England.
    Infinitely many M2-instanton corrections to M-theory on G(2)-manifolds2018Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 9, artikel-id 077Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We consider the non-perturbative superpotential for a class of four-dimensional N = 1 vacua obtained from M-theory on seven-manifolds with holonomy G(2). The class of G(2)-holonomy manifolds we consider are so-called twisted connected sum (TCS) constructions, which have the topology of a K3-fibration over S-3. We show that the non-perturbative superpotential of M-theory on a class of TCS geometries receives infinitely many inequivalent M2-instanton contributions from infinitely many three-spheres, which we conjecture are supersymmetric (and thus associative) cycles. The rationale for our construction is provided by the duality chain of [1], which relates M-theory on TCS G(2) manifolds to E-8 x E-8 heterotic backgrounds on the Schoen Calabi-Yau threefold, as well as to F-theory on a K3-fibered Calabi-Yau fourfold. The latter are known to have an infinite number of instanton corrections to the superpotential and it is these contributions that we trace through the duality chain back to the G(2)-compactification.

  • 2. Candelas, Philip
    et al.
    Constantin, Andrei
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Damian, Cesar
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Morales, Jose Francisco
    4 Type IIB flux vacua from G-theory I2015Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, artikel-id 187Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We construct non-perturbatively exact four-dimensional Minkowski vacua of type IIB string theory with non-trivial fluxes. These solutions are found by gluing together, consistently with U-duality, local solutions of type IIB supergravity on T-4 x C with the metric, dilaton and flux potentials varying along C and the flux potentials oriented along T-4. We focus on solutions locally related via U-duality to non-compact Ricci-flat geometries. More general solutions and a complete analysis of the supersymmetry equations are presented in the companion paper [1]. We build a precise dictionary between fluxes in the global solutions and the geometry of an auxiliary K3 surface fibered over CP1. In the spirit of F-theory, the flux potentials are expressed in terms of locally holomorphic functions that parametrize the complex structure moduli space of the K3 fiber in the auxiliary geometry. The brane content is inferred from the monodromy data around the degeneration points of the fiber.

  • 3. Candelas, Philip
    et al.
    Constantin, Andrei
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Damian, Cesar
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Morales, Jose Francisco
    Type IIB flux vacua from G-theory II2015Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, artikel-id 188Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We find analytic solutions of type IIB supergravity on geometries that locally take the form Mink x M-4 x C with M-4 a generalised complex manifold. The solutions involve the metric, the dilaton, NSNS and RR flux potentials (oriented along the M-4) parametrised by functions varying only over C. Under this assumption, the supersymmetry equations are solved using the formalism of pure spinors in terms of a finite number of holomorphic functions. Alternatively, the solutions can be viewed as vacua of maximally supersymmetric supergravity in six dimensions with a set of scalar fields varying holomorphically over C. For a class of solutions characterised by up to five holomorphic functions, we outline how the local solutions can be completed to four-dimensional flux vacua of type IIB theory. A detailed study of this global completion for solutions with two holomorphic functions has been carried out in the companion paper [1]. The fluxes of the global solutions are, as in F-theory, entirely codified in the geometry of an auxiliary K3 fibration over CP1. The results provide a geometric construction of fluxes in F-theory.

  • 4.
    Chialva, Diego
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Johansson, Niklas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik, Teoretisk fysik.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Vonk, Marcel
    IHES.
    Deforming, revolving and resolving: New paths in the string theory landscape2008Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 02, artikel-id 016Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper we investigate the properties of series of vacua in the string theory landscape. In particular, we study minima to the flux potential in type IIB compactifications on the mirror quintic. Using geometric transitions, we embed its one-dimensional complex structure moduli space in that of another Calabi-Yau with h1,1 = 86 and h2,1 = 2. We then show how to construct infinite series of continuously connected minima to the mirror quintic potential by moving into this larger moduli space, applying its monodromies, and moving back. We provide an example of such series, and discuss their implications for the string theory landscape

  • 5.
    Danielsson, Ulf
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Johansson, Niklas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Stability of flux vacua in the presence of charged black2006Ingår i: JHEP, Vol. 09, s. 069-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this letter we consider a charged black hole in a flux compactification of type IIB string theory. Both the black hole and the fluxes will induce potentials for the complex structure moduli. We choose the compact dimensions to be described locally by a deformed conifold, creating a large hierarchy. We demonstrate that the presence of a black hole typically will not change the minimum of the moduli potential in a substantial way. However, we also point out a couple of possible loop-holes, which in some cases could lead to interesting physical consequences such as changes in the hierarchy.

  • 6.
    Danielsson, Ulf
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Johansson, Niklas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    The world next door: Results in landscape topography2007Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 03, s. 080-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Recently, it has become clear that neighboring multiple vacua might have interesting consequences for the physics of the early universe. In this paper we investigate the topography of the string landscape corresponding to complex structure moduli of flux compactified type IIB string theory. We find that series of continuously connected vacua are common. The properties of these series are described, and we relate the existence of infinite series of minima to certain unresolved mathematical problems in group theory. Numerical studies of the mirror quintic serve as illustrating examples.

  • 7.
    Danielsson, Ulf
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik. Institutionen för fysik och materialvetenskap, Teoretisk fysik.
    Johansson, Niklas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik. Institutionen för fysik och materialvetenskap, Teoretisk fysik.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik. Institutionen för fysik och materialvetenskap, Teoretisk fysik.
    Olsson, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik. Institutionen för fysik och materialvetenskap, Teoretisk fysik.
    Vonk, Marcel
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik. Institutionen för fysik och materialvetenskap, Teoretisk fysik.
    4D black holes and holomorphic factorization of the 0A matrix model2005Ingår i: Journal of High Energy Physics, Vol. 0510, s. 046-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    n this letter, we relate the free energy of the 0A matrix model to the sum of topological and anti-topological string amplitudes. For arbitrary integer multiples of the matrix model self-dual radius we describe the geometry on which the corresponding topological string propagates. This geometry is not the one that follows from the usual ground ring analysis, but in a sense its "holomorphic square root". Mixing of terms for different genus in the matrix model free energy yields one-loop terms compatible with type II strings on compact Calabi-Yau target spaces. As an application, we give an explicit example of how to relate the 0A matrix model free energy to that of a four-dimensional black hole in type IIB theory, compactified on a compact Calabi-Yau. Variables, Legendre transforms, and large classical terms on both sides match perfectly.

  • 8.
    de la Ossa, Xenia
    et al.
    Univ Oxford, Math Inst, Andrew Wiles Bldg,Woodstock Rd, Oxford OX2 6GG, England..
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Svanes, Eirik E.
    Univ Paris 06, Univ Paris 04, Inst Lagrange Paris, LPTHE, F-75005 Paris, France..
    Exploring SU(3) structure moduli spaces with integrable G(2) structures2015Ingår i: Advances in Theoretical and Mathematical Physics, ISSN 1095-0761, E-ISSN 1095-0753, Vol. 19, nr 4, s. 837-903Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We study the moduli space of SU(3) structure manifolds X that form the internal compact spaces in four-dimensional N = 1/2 domain wall solutions of heterotic supergravity with flux. Together with the direction perpendicular to the four-dimensional domain wall, X forms a non-compact 7-manifold Y with torsionful G(2) structure. We use this G(2) embedding to explore how X(t) varies along paths C(t) in the SU(3) structure moduli space. Our analysis includes the Bianchi identities which strongly constrain the flow. We show that requiring that the SU(3) structure torsion is preserved along the path leads to constraints on the G(2) torsion and the embedding of X in Y. Furthermore, we study flows along which the torsion classes of X go from zero to non-zero values. In particular, we present evidence that the flow of half-flat SU(3) structures may contain Calabi-Yau loci, in the presence of non-vanishing H-flux.

  • 9.
    de la Ossa, Xenia
    et al.
    Univ Oxford, Math Inst, Andrew Wiles Bldg,Woodstock Rd, Oxford OX2 6GG, England..
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Svanes, Eirik E.
    UPMC Univ Paris 06, Sorbonne Univ, UMR 7589, LPTHE, F-75005 Paris, France.;CNRS, UMR 7589, LPTHE, F-75005 Paris, France.;Sorbonne Univ, Inst Lagrange Paris, 98 Bis Bd Arago, F-75014 Paris, France..
    Infinitesimal moduli of G2 holonomy manifolds with instanton bundles2016Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 11, artikel-id 016Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We describe the infinitesimal moduli space of pairs (Y, V) where Y is a manifold with G(2) holonomy, and V is a vector bundle on Y with an instanton connection. These structures arise in connection to the moduli space of heterotic string compactifications on compact and non-compact seven dimensional spaces, e.g. domain walls. Employing the canonical G(2) cohomology developed by Reyes-Carrion and Fern\'andez and Ugarte, we show that the moduli space decomposes into the sum of the bundle moduli H-d(sic)A(1)(Y, End(V)) plus the moduli of the G(2) structure preserving the instanton condition. The latter piece is contained in H-d(sic)theta(1)(Y, TY), and is given by the kernel of a map F(sic) which generalises the concept of the Atiyah map for holomorphic bundles on complex manifolds to the case at hand. In fact, the map F(sic) is given in terms of the curvature of the bundle and maps H-d(sic)theta(1)(Y, TY) into H-d(sic)A(2) (Y, End(V)), and moreover can be used to define a cohomology on an extension bundle of TY by End(V). We comment further on the resemblance with the holomorphic Atiyah algebroid and connect the story to physics, in particular to heterotic compactifications on (Y,V) when alpha'=0.

  • 10.
    de la Ossa, Xenia
    et al.
    Oxford, UK.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Svanes, Eirik E.
    LPTHE, Paris 6.
    Restrictions of Heterotic G2 Structures and Instanton Connections2017Ingår i: Proceedings, Nigel Hitchin’s 70th Birthday Conference: Geometry and Physics : A Festschrift in honour of Nigel Hitchin : 2 volumes: Aarhus, Denmark, Oxford, UK, Madrid, Spain, September 5-16, 2016, Oxford: Oxford University Press, 2017Konferensbidrag (Refereegranskat)
    Abstract [en]

    This note revisits recent results regarding the geometry and moduli of solutions of the heterotic string on manifolds Y with a G2 structure. In particular, such heterotic G2 systems can be rephrased in terms of a differential Dˇ acting on a complex Ωˇ∗(Y,Q), where Q=T∗Y⊕End(TY)⊕End(V), and Dˇ 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 H1Dˇ(Y,Q). We proceed 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, we derive 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).

  • 11.
    de la Ossa, Xenia
    et al.
    Univ Oxford, Math Inst, Andrew Wiles Bldg,Woodstock Rd, Oxford OX2 6GG, England.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Svanes, Eirik E.
    Sorbonne Univ, UPMC Paris 06, LPTHE, UMR 7589, F-75005 Paris, France;Sorbonne Univ, Inst Lagrange Paris, 98 Bis Bd Arago, F-75014 Paris, France.
    The Infinitesimal Moduli Space of Heterotic G2 Systems2018Ingår i: Communications in Mathematical Physics, ISSN 0010-3616, E-ISSN 1432-0916, Vol. 360, nr 2, s. 727-775Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Heterotic string compactifications on integrable G(2) structure manifolds Y with instanton bundles (V, A), (TY, (theta) over tilde )yield supersymmetric three-dimensional vacua that are of interest in physics. In this paper, we define a covariant exterior derivative D and show that it is equivalent to a heterotic G(2) system encoding the geometry of the heterotic string compactifications. This operator D acts on a bundle Q = T*Y circle plus End (V) circle plus End (TY) and satisfies a nilpotency condition (sic)(2) = 0, for an appropriate projection of D. Furthermore, we determine the infinitesimal moduli space of these systems and show that it corresponds to the finite-dimensional cohomology group (sic)(1)((sic)) (Q). We comment on the similarities and differences of our result with Atiyah's well-known analysis of deformations of holmorphic vector bundles over complex manifolds. Our analysis leads to results that are of relevance to all orders in the alpha' expansion.

  • 12.
    Johnson, Matthew C
    et al.
    California Institute of Technology.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Field dynamics and tunneling in a flux landscape2008Ingår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, nr 8, s. 0835341-08353423Artikel i tidskrift (Refereegranskat)
  • 13.
    Johnson, Matthew C
    et al.
    California Institute of Technology.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Obstacle to populating the string theory landscape2008Ingår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, nr 12, s. 1235131-1235135Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We construct domain walls and instantons in a class of models with coupled scalar fields, determining, in agreement with previous studies, that many such solutions contain naked timelike singularities. Vacuum bubble solutions of this type do not contain a region of true vacuum, obstructing the ability of eternal inflation to populate other vacua. We determine a criterion that potentials must satisfy to avoid the existence of such singularities and show that many domain wall solutions in type IIB string theory are singular.

  • 14.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Generalised Geometry and Flux Vacua: A very short review2016Konferensbidrag (Refereegranskat)
    Abstract [en]

    This note discusses the connection between generalised geometry and flux compactifications of string theory. Firstly, we explain in a pedestrian manner how the supersymmetry constraints of type II flux compactifications can be restated as integrability constraints on certain generalised complex structures. This reformulation uses generalised complex geometry, a mathematical framework that geometrizes the B-field. Secondly, we discuss how exceptional generalised geometry may provide a similar geometrization of the RR fields. Thirdly, we examine the connection between generalised geometry and non-geometry, and finally we present recent developments where generalised geometry is used to construct explicit examples of flux compactifications to flat space.

  • 15.
    Larfors, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Pierced, Wrapped and Torn: Aspects of String Theory Compactifications2009Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    An outstanding problem in physics is to find a unified framework for quantum mechanics and general relativity. This is required for a better understanding of black holes and the early cosmology of the universe. String theory provides such a unification. In this thesis, we study aspects of compactifications of type IIB string theory. In the first part of the thesis, we study four-dimensional black holes consisting of D3-branes wrapping cycles in the compact dimensions. We discuss the correspondence between these black holes, topological string theory and matrix models. We then study the influence of black holes on the stability of flux compactifications. In the second part of the thesis, we turn to investigations of the type IIB landscape, i.e. the collection of stable and metastable vacua obtained from flux compactifications on conformal Calabi-Yau manifolds. We show that monodromies are important for the topographic structure of the landscape. In particular we find that there are long series of continuously connected vacua in the complex structure moduli space of the internal manifold. We also use geometric transitions to connect the moduli spaces of different manifolds, and create longer series of vacua. Finally, we investigate the stability of string theory vacua by constructing semiclassical instantons. These results have implications for the population of the landscape by eternal inflation.

    Delarbeten
    1. Deforming, revolving and resolving: New paths in the string theory landscape
    Öppna denna publikation i ny flik eller fönster >>Deforming, revolving and resolving: New paths in the string theory landscape
    Visa övriga...
    2008 (Engelska)Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 02, artikel-id 016Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    In this paper we investigate the properties of series of vacua in the string theory landscape. In particular, we study minima to the flux potential in type IIB compactifications on the mirror quintic. Using geometric transitions, we embed its one-dimensional complex structure moduli space in that of another Calabi-Yau with h1,1 = 86 and h2,1 = 2. We then show how to construct infinite series of continuously connected minima to the mirror quintic potential by moving into this larger moduli space, applying its monodromies, and moving back. We provide an example of such series, and discuss their implications for the string theory landscape

    Nyckelord
    Superstring Vacua, Flux compactifications
    Nationell ämneskategori
    Fysik
    Forskningsämne
    Teoretisk fysik
    Identifikatorer
    urn:nbn:se:uu:diva-100502 (URN)10.1088/1126-6708/2008/02/016 (DOI)000254764400096 ()
    Tillgänglig från: 2009-04-01 Skapad: 2009-04-01 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
    2. The world next door: Results in landscape topography
    Öppna denna publikation i ny flik eller fönster >>The world next door: Results in landscape topography
    2007 (Svenska)Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 03, s. 080-Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Recently, it has become clear that neighboring multiple vacua might have interesting consequences for the physics of the early universe. In this paper we investigate the topography of the string landscape corresponding to complex structure moduli of flux compactified type IIB string theory. We find that series of continuously connected vacua are common. The properties of these series are described, and we relate the existence of infinite series of minima to certain unresolved mathematical problems in group theory. Numerical studies of the mirror quintic serve as illustrating examples.

    Nyckelord
    Superstring Vacua, Flux compactifications, dS vacua in string theory
    Nationell ämneskategori
    Fysik
    Identifikatorer
    urn:nbn:se:uu:diva-13761 (URN)10.1088/1126-6708/2007/03/080 (DOI)000245922000080 ()
    Tillgänglig från: 2008-01-25 Skapad: 2008-01-25 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
    3. Stability of flux vacua in the presence of charged black
    Öppna denna publikation i ny flik eller fönster >>Stability of flux vacua in the presence of charged black
    2006 (Engelska)Ingår i: JHEP, Vol. 09, s. 069-Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    In this letter we consider a charged black hole in a flux compactification of type IIB string theory. Both the black hole and the fluxes will induce potentials for the complex structure moduli. We choose the compact dimensions to be described locally by a deformed conifold, creating a large hierarchy. We demonstrate that the presence of a black hole typically will not change the minimum of the moduli potential in a substantial way. However, we also point out a couple of possible loop-holes, which in some cases could lead to interesting physical consequences such as changes in the hierarchy.

    Identifikatorer
    urn:nbn:se:uu:diva-20261 (URN)
    Tillgänglig från: 2006-12-06 Skapad: 2006-12-06 Senast uppdaterad: 2011-01-11
    4. 4D black holes and holomorphic factorization of the 0A matrix model
    Öppna denna publikation i ny flik eller fönster >>4D black holes and holomorphic factorization of the 0A matrix model
    Visa övriga...
    2005 (Engelska)Ingår i: Journal of High Energy Physics, Vol. 0510, s. 046-Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    n this letter, we relate the free energy of the 0A matrix model to the sum of topological and anti-topological string amplitudes. For arbitrary integer multiples of the matrix model self-dual radius we describe the geometry on which the corresponding topological string propagates. This geometry is not the one that follows from the usual ground ring analysis, but in a sense its "holomorphic square root". Mixing of terms for different genus in the matrix model free energy yields one-loop terms compatible with type II strings on compact Calabi-Yau target spaces. As an application, we give an explicit example of how to relate the 0A matrix model free energy to that of a four-dimensional black hole in type IIB theory, compactified on a compact Calabi-Yau. Variables, Legendre transforms, and large classical terms on both sides match perfectly.

    Identifikatorer
    urn:nbn:se:uu:diva-79421 (URN)
    Tillgänglig från: 2006-04-10 Skapad: 2006-04-10 Senast uppdaterad: 2011-01-11
    5. Field dynamics and tunneling in a flux landscape
    Öppna denna publikation i ny flik eller fönster >>Field dynamics and tunneling in a flux landscape
    2008 (Engelska)Ingår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, nr 8, s. 0835341-08353423Artikel i tidskrift (Refereegranskat) Published
    Ort, förlag, år, upplaga, sidor
    American Physical Society, 2008
    Nationell ämneskategori
    Annan fysik
    Forskningsämne
    fysik
    Identifikatorer
    urn:nbn:se:uu:diva-100308 (URN)10.1103/PhysRevD.78.083534 (DOI)
    Tillgänglig från: 2009-03-30 Skapad: 2009-03-30 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
    6. Obstacle to populating the string theory landscape
    Öppna denna publikation i ny flik eller fönster >>Obstacle to populating the string theory landscape
    2008 (Engelska)Ingår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, nr 12, s. 1235131-1235135Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    We construct domain walls and instantons in a class of models with coupled scalar fields, determining, in agreement with previous studies, that many such solutions contain naked timelike singularities. Vacuum bubble solutions of this type do not contain a region of true vacuum, obstructing the ability of eternal inflation to populate other vacua. We determine a criterion that potentials must satisfy to avoid the existence of such singularities and show that many domain wall solutions in type IIB string theory are singular.

    Ort, förlag, år, upplaga, sidor
    American Physical Society, 2008
    Nationell ämneskategori
    Fysik
    Forskningsämne
    teoretisk fysik
    Identifikatorer
    urn:nbn:se:uu:diva-100500 (URN)10.1103/PhysRevD.78.123513 (DOI)
    Tillgänglig från: 2009-04-01 Skapad: 2009-04-01 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
  • 16.
    Larfors, Magdalena
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Lukas, Andre
    Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Parks Rd, Oxford OX1 3PU, England.
    Ruehle, Fabian
    Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Parks Rd, Oxford OX1 3PU, England.
    Calabi-Yau manifolds and SU(3) structure2019Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 1, artikel-id 171Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We show that non-trivial SU(3) structures can be constructed on large classes of Calabi-Yau three-folds. Specifically, we focus on Calabi-Yau three-folds constructed as complete intersections in products of projective spaces, although we expect similar methods to apply to other constructions and also to Calabi-Yau four-folds. Among the wide range of possible SU(3) structures we find Strominger-Hull systems, suitable for heterotic or type II string compactifications, on all complete intersection Calabi-Yau manifolds. These SU(3) structures of Strominger-Hull type have a non-vanishing and non-closed three-form flux which needs to be supported by source terms in the associated Bianchi identity. We discuss the possibility of finding such source terms and present first steps towards their explicit construction. Provided suitable sources exist, our methods lead to Calabi-Yau compactifications of string theory with a non Ricci-flat, physical metric which can be written down explicitly and in analytic form.

  • 17.
    Larfors, Magdalena
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Schneider, Robin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Line Bundle Cohomologies on CICYs with Picard Number TwoIngår i: Fortschritte der Physik, ISSN 0015-8208, E-ISSN 1521-3978Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We analyse line bundle cohomologies on all favourable co-dimension two Complete Intersection Calabi Yau (CICY) manifolds of Picard number two. Our results provide further evidence that the cohomology dimensions of such line bundles are given by analytic expressions, which change between regions in the line bundle charge space. This agrees with recent observations of CY line bundles presented in Refs. [1, 2]. In many cases, the expressions for bundle cohomology dimensions are polynomial functions of the line bundle charges (of degree at most 3), and the regions are cones. A more novel observation is that for some CICY manifolds, the cohomologies are more succinctly determined by recursive relationships. There can also be boundaries between regions where a polynomial fit fails, and we link these exceptional cases to irregular behaviour of the index of the line bundle. Finally, our observations provide evidence for similarities in the line bundle cohomologies for CICY manifolds that share rows in the configuration matrix. Among such related CICY manifolds, we find both that the line bundle charge space is partitioned in the same manner, and that the same, or closely related, analytical descriptions apply for the cohomology dimensions in these regions.

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