Tachyonic de Sitter Solutions of 10d Type II Supergravities

Andriot, David

doi:10.1002/prop.202100063

Cited by 24 publications

(45 citation statements)

References 107 publications

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“…When allowing for large field space curvature, rapid-turn inflation becomes possible, but it is never fat and in fact is tachyonic. This appears to be a ubiquitous feature of rapid-turn inflation in supergravity; tachyons are also a feature of de Sitter constructions in supergravity [43]. The models we have examined in Section 3 do not satisfy the refined de Sitter conjecture globally as they have points with positive masses and V ∼ O(10 −4 ); however, rapid-turn inflationary trajectories do not exist in that region.…”

Section: Discussionmentioning

confidence: 94%

Rapid-turn inflation in supergravity is rare and tachyonic

Aragam,

Chiovoloni,

Paban

et al. 2021

Preprint

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Strongly non-geodesic, or rapidly turning, trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. For example, such trajectories can evade the η-problem in fat inflation, in which all inflatons are heavier than the Hubble scale. Most models with large turning rates in the literature are formulated as effective field theories. In this paper we investigate rapid-turn inflation in supergravity as a first step toward understanding them in string theory. We find that large turning rates can be generated in a wide class of models, at the cost of high field space curvature. However, in these models one field is always tachyonic along the inflationary trajectory, implying that fat inflation may not be viable in supergravity. The high curvatures underscore the difficulty of obtaining rapid-turn inflation in realistic string-theoretical models.

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Section: Discussionmentioning

confidence: 94%

Rapid-turn inflation in supergravity is rare and tachyonic

Aragam,

Chiovoloni,

Paban

et al. 2021

Preprint

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“…Last but not least, 4d anti-de Sitter spacetimes are typically considered in a holographic context, but they also appear in various phenomenology related topics, for instance in certain constructions of de Sitter solutions [1,2] or in the matter of scale separation, revived recently in the swampland program [3,4]. In addition, the general belief that non-supersymmetric solutions are unstable is shared in various forms for all maximally symmetric spacetimes: see for instance [5][6][7][8][9] for de Sitter, [10,11] for Minkowski and [12] for anti-de Sitter. The importance of such solutions, and the common properties they may share, motivates us in this paper to classify them, within a certain (standard) ansatz.…”

Section: Jhep06(2022)131 1 Introduction and Results Summarymentioning

confidence: 99%

“…It calls for more dedicated searches, e.g. as in [9], but exhibiting already these new examples offers the hope of new physics.…”

Section: Jhep06(2022)131 1 Introduction and Results Summarymentioning

confidence: 99%

Charting the landscape of (anti-) de Sitter and Minkowski solutions of 10d supergravities

Andriot

Horer

Marconnet

2022

J. High Energ. Phys.

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We classify solutions of 10d type IIA/B supergravities with orientifolds, on a 4d maximally symmetric spacetime times a 6d group manifold. We then look for new solutions in previously unexplored solution classes, and find some: (anti-) de Sitter solutions with intersecting O4, O6 and D6, or Minkowski solutions with 3 intersecting O5, among others. We provide the numerical code that we developed for this purpose. We also prove new no-go theorems against (anti-) de Sitter solutions. We finally conjecture the absence of de Sitter solution for 2 or less intersecting source sets, implying that a 4d effective theory with de Sitter is at most $$ \mathcal{N} $$ N = 1 supersymmetric.

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“…As suggested in the literature (see [14,15] and [27][28][29][30][31][32][33][34][35][36]), it is possible to find stable vacua by turning on different contributions to the scalar potential. Here we are interested in a non-vanishing contribution from S F 5 to V eff .…”

Section: Stable Non Susy Ads Vacua From Torsionmentioning

confidence: 99%

Metastable vacua from torsion and machine learning

Damián¹,

Loaiza-Brito²

2022

Preprint

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By implementing an error function on a Machine Learning algorithm we look for minimal conditions to construct stable Anti de Sitter and de Sitter vacua from dimensional type IIB String theory compactifcation on Kähler manifolds with torsion. This allows to have contributions to the scalar potential from the five-form flux and from D-branes wrapping torsional cycles, interpreted as non-BPS states. The former implies the possibility to construct stable AdS vacua while the later constitutes a mechanism to uplift AdS to dS vacua. Particularly we consider D5 non-BPS states to uplift the stable AdS vacua to an (apparently) stable dS minimum. Both results −the generation of an AdS vacuum and the corresponding uplifting to a dS one− are restricted to certain type of configurations, specifically with the number of O3 orientifolds bounded from below by the number of D3-branes and fluxes. Under these conditions we report over 170 dS (classical) stable vacua. In all of them, the uplifted effective potential becomes very flat indicating the presence of possible source of instabilities. We comment about their relation with the Swampland Conjectures.

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Tachyonic de Sitter Solutions of 10d Type II Supergravities

Cited by 24 publications

References 107 publications

Rapid-turn inflation in supergravity is rare and tachyonic

Rapid-turn inflation in supergravity is rare and tachyonic

Charting the landscape of (anti-) de Sitter and Minkowski solutions of 10d supergravities

Metastable vacua from torsion and machine learning

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