KK-monopoles and G-structures in M-theory/type IIA reductions

Danielsson, Ulf H.; Dibitetto, Giuseppe; Guarino, Adolfo

doi:10.1007/jhep02(2015)096

Cited by 16 publications

(12 citation statements)

References 47 publications

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“…Finally we point out that a natural extension of our results is to include G2 torsion along the lines of [74,75] and check whether other scale-separated AdS or even dS solutions can arise.…”

Section: No-scalementioning

confidence: 86%

No-scale and scale-separated flux vacua from IIA on G2 orientifolds

2020

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We discuss flux compactifications of IIA string theory on G2 holonomy spaces with O2/O6-planes to three dimensions and find two classes of solutions: (1) No-scale Minkowski vacua from NSNS 3-form fluxes and RR 4-form fluxes. (2) By adding Romans mass we find AdS$$_3$$ 3 vacua for which the AdS scale can be decoupled completely from the KK scale while the solution is at tunable weak coupling and large volume. For the AdS$$_3$$ 3 vacuum we only have a proper 3D description (i.e. smeared orientifold description) of the solution like the 4D analogue of IIA moduli stabilization from fluxes and O6-planes. This 3D description reveals that moduli with non-compact moduli spaces can be stabilized at the classical level. For both types of vacua we can have supersymmetry or not.

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Section: No-scalementioning

confidence: 86%

No-scale and scale-separated flux vacua from IIA on G2 orientifolds

2020

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“…The above background describes both SUSY and non-SUSY AdS extrema, depending on the choices of the constants in the flux Ansatz. Upon using the dictionary in [21], these solutions may be interpreted as those in [22,23] obtained via SU(3)-structure compactifications.…”

Section: Massive Type Iia Solutions In Adsmentioning

confidence: 99%

A swamp of non-SUSY vacua

Danielsson

Dibitetto

Vargas

2017

J. High Energ. Phys.

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Abstract:We consider known examples of non-supersymmetric AdS 7 and AdS 4 solutions arising from compactifications of massive type IIA supergravity and study their stability, taking into account the coupling between closed-and open-string sector excitations. Generically, open strings are found to develop modes with masses below the Breitenlohner-Freedman (BF) bound. We comment on the relation with the Weak Gravity Conjecture, and how this analysis may play an important role in examining the validity of non-supersymmetric constructions in string theory.

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“…In this context, the twisted exterior derivative operator will now receive torsioninduced contributions. Following the philosophy of [62], part of the contributions to the internal curvature can be interpreted as the presence of space-filling KK-monopoles and T-duals thereof.…”

Section: Jhep07(2018)006mentioning

confidence: 99%

Space-filling branes & gaugings

Dibitetto

Riccioni

Risoli

2018

J. High Energ. Phys.

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We consider in any dimension the supersymmetric Z 2 truncations of the maximal supergravity theories. In each dimension and for each truncation we determine all the sets of 1/2-BPS space-filling branes, i.e. branes whose world-volume invades the whole of space-time, that preserve the supersymmetry of the truncated theory and the representations of the symmetry of such theory to which they belong. We show that in any dimension below eight these sets always contain exotic branes, that are objects that do not have a ten-dimensional origin. We repeat the same analysis for half-maximal theories and for the quarter-maximal theories in four and three dimensions. We then discuss all the possible gaugings of these theories as described in terms of the embedding tensor. In general, the truncation acts on the quadratic constraints of the embedding tensor in such a way that some representations survive the truncation although they are not required by the supersymmetry of the truncated theory. We show that for any theory, among these representations, the highest-dimensional ones are precisely those of the 1/2-BPS space-filling branes that preserve the same supersymmetry of the truncated theory, and we interpret this result as the fact that these quadratic constraints after the truncation become tadpole conditions for such branes.It is well known that the SO(32) type-I string theory in ten dimensions is obtained from the type-IIB theory by performing the orientifold projection [1,2]. In the closed sector, the projection is due to the O9-plane, while the open sector arises due to the presence of D9branes [3], and RR and NSNS tadpole cancellations correspond to the fact that the charge and tension of the O9-plane are cancelled by those of the D9-branes. In the low-energy theory, the projection in the closed sector acts as a Z 2 truncation to N = 1 supergravity, in which the spinors are halved and, among the gauge potentials, the NSNS 2-form B 2 and the RR 4-form C 4 are projected out, while the RR 2-form C 2 survives.From the point of view of supergravity, there is another consistent supersymmetric Z 2 truncation, in which all RR fields are projected out, leading to the gravity sector of the heterotic theory. The two truncations are related by S-duality. Denoting with ψ µ the gravitino of the IIB theory, which is a doublet of Majorana-Weyl spinors of the same 1 In [7] it was conjectured that the SO(32) heterotic theory can be obtained from type-IIB by performing the S-dual of the orientifold projection, and the charge and tension of the S-dual of the O9-plane are cancelled by these branes, that are the S-duals of the D9-branes and are defined as end-points of D-strings.

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KK-monopoles and G-structures in M-theory/type IIA reductions

Cited by 16 publications

References 47 publications

No-scale and scale-separated flux vacua from IIA on G2 orientifolds

No-scale and scale-separated flux vacua from IIA on G2 orientifolds

A swamp of non-SUSY vacua

Space-filling branes & gaugings

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