Quintessence and the Swampland: The Parametrically Controlled Regime of Moduli Space

Cicoli, Michele; Cunillera, Francesc; Padilla, Antonio; Pedro, Francisco G.

doi:10.1002/prop.202200009

Cited by 27 publications

(31 citation statements)

References 39 publications

(55 reference statements)

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“…Not only do these solutions exhibit scale separation, they do so with parametric control, meaning that the separation can be tuned thanks to a parameter. It is important to distinguish the two concepts, as stressed in [23] for de Sitter solutions (see also [54]): one can simply look for a satisfactory hierarchy of scales in a given solution, without asking for this hierarchy to be tunable. Another concept is that of classicality of a 10d supergravity solution, namely whether it belongs to the classical regime of string theory.…”

Section: Scale Separationmentioning

confidence: 99%

Exploring the landscape of (anti-) de Sitter and Minkowski solutions: group manifolds, stability and scale separation

Andriot

Horer

Marconnet

2022

J. High Energ. Phys.

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We classified in [1] certain 10d supergravity solutions with a 4d de Sitter, Minkowski or anti-de Sitter spacetime. We then found new solutions in previously unexplored classes. In this paper we study their properties, compare them to swampland conjectures, and make new observations.Using new numerical tools, we first identify all Lie algebras underlying the 6d group manifolds, allowing us to discuss their compactness. We then investigate scale separation, and prove related no-go theorems. Last but not least, we automatize and analyze the stability of all solutions. This leads us to propose the Massless Minkowski Conjecture, claiming the systematic presence of a 4d flat direction.

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Section: Scale Separationmentioning

confidence: 99%

Exploring the landscape of (anti-) de Sitter and Minkowski solutions: group manifolds, stability and scale separation

Andriot

Horer

Marconnet

2022

J. High Energ. Phys.

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show abstract

“…Furthermore, for the Standard Model anti-brane the amount of warping provided by the fluxes can also be used in order to get the appropriate scales. See [115,116,117] for a recent critical assessment of realising quintessence within string compactifications.…”

Section: Uv Embeddingsmentioning

confidence: 99%

Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector

Burgess,

Dineen,

Quevedo

2021

Preprint

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We construct a class of 4D 'yoga' (naturally relaxed) models for which the vacuum energies of heavy particles do not gravitate. The models contain three ingredients: (i) a relaxation mechanism driven by a scalar field (the 'relaxon'), (ii) a very supersymmetric gravity sector coupled to the Standard Model in which supersymmetry is non-linearly realised, and (iii) an accidental approximate scale invariance expressed through the presence of a low-energy dilaton supermultiplet. All three are common in higher-dimensional and string constructions. Although none suffices on its own, taken together they predict a current Dark Energy density that is of order (M 2 W /M p ) 4 and a gravitino mass of order M 3 W /M 2 p , with M W , M p the weak and Planck scales respectively. The dilaton's vev τ determines the weak scale M W ∼ M p / √ τ and because the relevant part of the scalar potential arises as a function of ln τ it stabilizes τ in a local de Sitter minimum with exponentially large fields obtained using input parameters no larger than O(60), thereby explaining both the size of the electroweak hierarchy and the cosmological constant. Scale invariance implies the dilaton couples to matter like a Brans-Dicke scalar with coupling large enough to be naively ruled out by solar-system tests of gravity. Yet because it comes paired with an axion it escapes fifth-force bounds through the novel screening mechanism described in ArXiV:2110.10352. Cosmological axio-dilaton evolution provides a natural quintessence model for Dark Energy, whose evolution might realize recent proposals to resolve the Hubble tension, and whose axion contributes to Dark Matter. We summarize some of the remaining challenges, comment on implications for inflation and sketch possible UV completions of our approach.

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“…For this mechanism to work for a single (real) field, in general the corresponding potential must have a very flat profile along the physical trajectory. However [14] showed that slow roll quintessence cannot be achieved in any parametrically controlled regime of the moduli space of string theory. Viable quintessence models could therefore exist only in the bulk of moduli space where numerical, even if not parametric, control could still be achieved.…”

Section: Introductionmentioning

confidence: 99%

Stringy multifield quintessence and the Swampland

Brinkmann,

Cicoli,

Dibitetto

et al. 2022

Preprint

Self Cite

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We consider quintessence models within 4D effective descriptions of gravity coupled to two scalar fields. These theories are known to give rise to viable models of late-time cosmic acceleration without any need for flat potentials, and so they are potentially in agreement with the dS Swampland conjecture. In this paper we investigate the possibility of consistently embedding such constructions in string theory. We identify situations where the quintessence fields are either closed string universal moduli or non-universal moduli such as blow-up modes. We generically show that no trajectories compatible with today's cosmological parameters exist, if one starts from matter-dominated initial conditions. It is worth remarking that universal trajectories compatible with observations do appear, provided that the starting point at early times is a phase of kinetic domination. However, justifying this choice of initial conditions on solid grounds is far from easy. We conclude by studying Q-ball formation in this class of models and discuss constraints coming from Q-ball safety in all cases analyzed here.

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Quintessence and the Swampland: The Parametrically Controlled Regime of Moduli Space

Cited by 27 publications

References 39 publications

Exploring the landscape of (anti-) de Sitter and Minkowski solutions: group manifolds, stability and scale separation

Exploring the landscape of (anti-) de Sitter and Minkowski solutions: group manifolds, stability and scale separation

Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector

Stringy multifield quintessence and the Swampland

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