Testing the Swampland: H0 tension

Colgáin, Eoin Ó; Yavartanoo, Hossein

doi:10.1016/j.physletb.2019.134907

Cited by 79 publications

(43 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aside from the lack of a compelling physical motivation, probably the biggest issue facing the RdSC ( * ) is the observed dark energy in our universe, coupled with the fact that realistic quintessence models seem to be at least as difficult to construct in string theory as metastable de Sitter vacua [64][65][66]. Furthermore, even hypothetical quintessence models that satisfy the RdSC bounds are on the verge of being ruled out experimentally [67][68][69]54].…”

Section: Quintessence Vs Cosmological Constantmentioning

confidence: 99%

Conditions for (no) eternal inflation

Rudelius

2019

J. Cosmol. Astropart. Phys.

122

View full text Add to dashboard Cite

We construct analytic and numerical solutions of the Fokker-Planck equation that arises in the context of stochastic inflation. We use these solutions to derive necessary conditions for eternal inflation on the higher derivatives of the scalar field potential and examine the prospects for eternal inflation in a variety of popular models. We note similarities between the conditions needed to avoid eternal inflation and several recently-proposed Swampland criteria, which leads us to speculate on the possibility that the de Sitter Swampland conjectures should be viewed as approximate consequences of a No Eternal Inflation principle.

show abstract

Section: Quintessence Vs Cosmological Constantmentioning

confidence: 99%

Conditions for (no) eternal inflation

Rudelius

2019

J. Cosmol. Astropart. Phys.

122

View full text Add to dashboard Cite

show abstract

“…Theoretically, one possibility is modifying postrecombination physics, such as the dark energy or modified gravity models, e.g. [9][10][11][12][13][14][15][16][17][18][19][20]. Such solutions are constrained tightly by late-time observations [1].…”

mentioning

confidence: 99%

Is the Hubble tension a hint of AdS phase around recombination?

Piao

2020

Phys. Rev. D

177

View full text Add to dashboard Cite

Anti-de Sitter (AdS) vacua, being theoretically important, might have an unexpected impact on the observable universe. We find that in early dark energy (EDE) scenarios the existence of AdS vacua around recombination can effectively lift the CMB-inferred H0 value. As an example, we study a phenomenological EDE model with an AdS phase starting at the redshift z ∼ 2000 and ending shortly after recombination (hereafter the universe will settle down in a Λ > 0 phase until now), and obtain a best-fit H0 = 72.74 km/s/Mpc without degrading the CMB fit compared with the standard ΛCDM model. * yegen14@mails.ucas.ac.cn † yspiao@ucas.ac.cn ΛCDM PhaseAdS Phase

show abstract

“…We end up with

\begin{matrix} true \\ right d s_{10}^{2} & = & left \frac{r^{2}}{L^{2}} d s^{2} ({Mink}_{4}) + \frac{L^{2} d r^{2}}{r^{2}} \\ left + L^{2} true(d α^{2} + {cos}^{2} α d ψ^{2} + {sin}^{2} α (d β^{2} + {prefixsin}^{2} β d s^{2} false(S^{2} false)) true), \\ right F_{5} & = & left (1 + ★_{10}) {Vol}_{4} \land \frac{d r^{4}}{L^{4}}, F_{1} = F_{3} = B = 0, e^{ϕ} = c^{- 2} . \end{matrix}

So the only AdS

_{5} \times S^{2}

solutions in IIB are locally

{italicAdS}_{5} \times S^{5}

where here S 5 is parametrised as a foliation of

S^{1} \times S^{3}

. That this is all we find is consistent with the result of []. We can also restrict the period of ψ to a fraction of 2π, [], so that we have an orbifold of S 5 , and the orbifold singularity is at

α = π / 2

.…”

Section: Examplesmentioning

confidence: 99%

Minkowski Solutions of IIB Supergravity

Apruzzi

Geipel

Legramandi

et al. 2018

Fortschritte der Physik

View full text Add to dashboard Cite

We classify N = 2 Minkowski 4 solutions of IIB supergravity with an SU (2) R symmetry geometrically realized by an S 2 -foliation in the remaining six dimensions. For the various cases of the classification, we reduce the supersymmetric system of equations to PDEs. These cases often accommodate systems of intersecting branes and half-maximally supersymmetric AdS 5,6,7 solutions when they exist. As an example, we analyze the AdS 6 case in more detail, reducing the supersymmetry equations to a single cylindrical Laplace equation. We also recover an already known linear dilaton background dual to the (1, 1) Little String Theory (LST) living on NS5-branes, and we find a new Minkowski 5 linear dilaton solution from brane intersections. Finally, we also discuss some simple Minkowski 4 solutions based on compact conformal Calabi-Yau manifolds.2 This is not the only way to realise SU(2), indeed it is possible to decompose M 6 as a fibration of S 3 over some M 3 in terms of the Maurer-Cartan of SU(2). It is however unclear whether anything beyond the SU(2) × U(1) preserving squashed 3-sphere is compatible with SU(2) R . When it is compatible one can always T-dualise on the Hopf fibre and end up in a class with a round S 2 factor. Thus up to T-duality the combined results of this work and [26] cover such cases

show abstract

Testing the Swampland: H0 tension

Cited by 79 publications

References 73 publications

Conditions for (no) eternal inflation

Conditions for (no) eternal inflation

Is the Hubble tension a hint of AdS phase around recombination?

Minkowski Solutions of IIB Supergravity

Contact Info

Product

Resources

About