Intricacies of classical de Sitter string backgrounds

Andriot, David; Marconnet, Paul; Wrase, Timm

doi:10.1016/j.physletb.2020.136015

Cited by 27 publications

(78 citation statements)

References 12 publications

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“…D7-branes and O3/O7-planes give in fact a negative 23 The 3-moduli analysis, including ζ, gives analogous results. 24 The global maximum of V is, instead on the boundary of the Kähler cone (τ b = τs = τ min s ) where Vmax = 0.06. 25 This gives an estimate of the barrier for tunneling from the minimum to decompactification.…”

Section: Discussionmentioning

confidence: 99%

“…The resulting two-moduli potential, 23 beside the minimum, has a second stationary point at (τ s , τ b ) = (8.2, 1123) that turns out to be a saddle point. 24 If we furthermore keep τ s at its vev, the resulting one modulus potential is plot in figure 1 The grey plan at V = V saddle highlights the unstable direction for the saddle point.…”

Section: Warped Throat With O3-planes At the Tipmentioning

confidence: 99%

“…See[24] for a classical analysis of consistency constraints in a different context 3. One may improve the bound on M by making gs larger (still remaining in the perturbative regime).However in LVS[19,20], at the minimum gs is related to the volume of the compactification manifold, that for larger gs tends to be not so large, risking a violation also of the sugra approximation 4.…”

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confidence: 99%

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On de Sitter string vacua from anti-d3-branes in the large volume scenario

Crinò

Quevedo

Valandro

2021

J. High Energ. Phys.

124

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We consider de Sitter vacua realised in concrete type IIB Calabi-Yau compactifications with an anti D3-brane at the tip of a warped throat of Klebanov-Strassler type. The Kähler moduli are stabilised together with the complex structure modulus of the warped throat. The volume is exponentially large as in the large volume scenario (LVS). We analyse the conditions on the parameters of the EFT such that they are in the region of validity of our approximations, there are no runaway problems and the vacua satisfy all consistency constraints, such as tadpole cancellation. We illustrate our results with an explicit Calabi-Yau orientifold with two Kähler moduli and one antibrane on top of an O3-plane in a warped throat, that has the goldstino as its only massless state. The moduli are stabilised with gs∼ 0.2 and volume $$ \mathcal{V} $$ V ∼ 104 in string units, justifying the approximation used to derive the corresponding EFT. Although the model lacks chiral matter, it is presented as a proof of concept, chosen to be the simplest realisation of antibrane uplift.

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Section: Discussionmentioning

confidence: 99%

Section: Warped Throat With O3-planes At the Tipmentioning

confidence: 99%

mentioning

confidence: 99%

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On de Sitter string vacua from anti-d3-branes in the large volume scenario

Crinò

Quevedo

Valandro

2021

J. High Energ. Phys.

124

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“…Typically, these efforts involve the introduction of branes, orientifold planes, and fluxes [10]. One searches for particular stationary points of the action with positive cosmological constant, and asks whether the string coupling is small JHEP02(2021)050 and the compactification radii large at these points [30,31]. This, by itself, does not address the question of whether there is a systematic approximation.…”

Section: Searching For Stationary Points Of An Effective Actionmentioning

confidence: 99%

“…In other cases, one finds these and other pathologies -AdS rather than dS stationary points and instabilities. Searches involving broader sets of moduli [30,31] seem to allow at best a few isolated regions of parameter space where such solutions might exist. Whether these might exhibit a sensible perturbation expansion is currently an open question, but our results above suggest that the combination is a tall order.…”

Section: Jhep02(2021)050mentioning

confidence: 99%

Obstacles to constructing de Sitter space in string theory

Dine

Law-Smith

Sun

et al. 2021

J. High Energ. Phys.

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There have been many attempts to construct de Sitter space-times in string theory. While arguably there have been some successes, this has proven challenging, leading to the de Sitter swampland conjecture: quantum theories of gravity do not admit stable or metastable de Sitter space. Here we explain that, within controlled approximations, one lacks the tools to construct de Sitter space in string theory. Such approximations would require the existence of a set of (arbitrarily) small parameters, subject to severe constraints. But beyond this one also needs an understanding of big-bang and big-crunch singularities that is not currently accessible to standard approximations in string theory. The existence or non-existence of metastable de Sitter space in string theory remains a matter of conjecture.

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Tachyonic de Sitter Solutions of 10d Type II Supergravities

Andriot

2021

Fortschritte der Physik

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Cosmological models of the early or late universe exhibit (quasi) de Sitter space‐times with different stability properties. Considering models derived from string theory, the swampland program does not provide for now a definite characterisation of this stability. In this work we focus on de Sitter solutions of 10d type II supergravities, candidates for classical de Sitter string backgrounds: surprisingly, all known examples are unstable with ηV<−1. We aim at proving the existence of such a systematic tachyon, and getting formally a bound on the value of ηV. To that end, we develop three methods, giving us various sufficient conditions for having a tachyon upon assumptions, in analogy with de Sitter no‐go theorems. Our analysis eventually indicates the existence of variety of different tachyons, and related bounds on ηV. We use this knowledge to find 10 new de Sitter solutions of type IIB supergravity, that have tachyons of a different kind, higher ηV values and new 6d geometries. One solution even appears to be stable, with however non‐compact extra dimensions.

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Intricacies of classical de Sitter string backgrounds

Cited by 27 publications

References 12 publications

On de Sitter string vacua from anti-d3-branes in the large volume scenario

On de Sitter string vacua from anti-d3-branes in the large volume scenario

Obstacles to constructing de Sitter space in string theory

Tachyonic de Sitter Solutions of 10d Type II Supergravities

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