The Standard Model Quiver in de Sitter String Compactifications

Cicoli, Michele; Etxebarria, Iñaki García; Quevedo, Fernando; Schachner, Andreas; Shukla, Pramod; Valandro, Roberto

doi:10.48550/arxiv.2106.11964

Cited by 7 publications

(9 citation statements)

References 118 publications

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“…These conjectures are not based on rigorous proofs and several counterexamples have been proposed. [19][20][21][22][23][24][25][26][27][28] Rather, the logic behind their formulation is the theoretical difficulty in establishing the existence of a dS vacuum in a fully convincing manner, mainly due to the need to break supersymmetry. Strong evidence in favour of the refined version of the conjecture has been given in [18] for any parametrically controlled regime of string theory using a combination of the distance conjecture and entropy considerations.…”

Section: Introductionmentioning

confidence: 99%

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

Cicoli

Cunillera

Padilla

et al. 2022

Fortschritte der Physik

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We provide a detailed discussion of the main theoretical and phenomenological challenges of quintessence model building in any numerically controlled regime of the moduli space of string theory. We argue that a working quintessence model requires a leading order non-supersymmetric (near) Minkowski vacuum with an axionic flat direction. This axion, when lifted by subdominant non-perturbative effects, could drive hilltop quintessence only for highly tuned initial conditions and a very low inflationary scale. Our analysis has two important implications. Firstly, scenarios which are in agreement with the swampland conjectures, such as those that include runaways, or supersymmetric AdS and Minkowski vacua, cannot give rise to phenomenologically viable quintessence with full computational control. This raises doubts on the validity of the swampland dS conjecture since it would imply a strong tension between quantum gravity and observations. Secondly, if data should prefer dynamical dark energy, axion models based on alignment mechanisms look more promising than highly contrived hilltop scenarios.

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Section: Introductionmentioning

confidence: 99%

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

Cicoli

Cunillera

Padilla

et al. 2022

Fortschritte der Physik

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“…Perturbatively flat vacua are important also for recent LVS explicit realisations of the Standard Model with D3-branes at an orientifolded dP 5 singularity [27]. In these constructions the cancellation of all D7-charges and Freed-Witten anomalies forces the presence of a hidden D7-sector with non-zero gauge fluxes which induce a T-brane background suitable for de Sitter uplifting [28].…”

Section: Introductionmentioning

confidence: 99%

“…In these constructions the cancellation of all D7-charges and Freed-Witten anomalies forces the presence of a hidden D7-sector with non-zero gauge fluxes which induce a T-brane background suitable for de Sitter uplifting [28]. As can be seen from equations (5.41) and (5.46) of [27] the T-brane contribution can give a leading order Minkowski vacuum if |W 0 | takes a form similar to the one typical of perturbative flat vacua since |W 0 | ∼ λ 1 e −2πλ 2 /gs where λ 1 and λ 2 are O(1) model-dependent coefficients which depend on microscopic quantities like the Calabi-Yau Euler characteristic and intersection numbers, the number of blow-up modes, gauge flux quanta and the rank of condensing gauge groups. Phenomenologically viable vacua with a de Sitter minimum and soft terms above the TeV scale can require |W 0 | as small as |W 0 | ∼ 10 −13 .…”

Section: Introductionmentioning

confidence: 99%

On the Search for Low $W_0$

Broeckel,

Cicoli,

Maharana

et al. 2021

Preprint

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The magnitude of the vacuum expectation value of the Gukov-Vafa-Witten superpotential |W 0 | plays a central role in the phenomenology of type IIB flux compactifications. Recent analytical constructions have shown that perturbatively flat vacua can be used to obtain very low values of |W 0 |. We present systematic algorithms to carry out exhaustive numerical searches for such vacua. We also analyse them in the statistical context, as part of the entire ensemble of type IIB flux vacua at low |W 0 |. Our preliminary analysis indicates that these perturbatively flat vacua are statistically sparse in the whole set of vacua at low |W 0 | as calculated by Denef and Douglas. Two-moduli examples are used to illustrate these more general findings in specific settings. We find that these simple cases are good examples for existence proofs but they do not feature a large statistical tuning freedom for phenomenological applications.

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“…One of the most serious obstacles to this is the tension between chirality and moduli-fixing by non-perturbative effects [42]. Several potential solutions, however, have already been proposed by carefully analyzing the Freed-Witten anomaly and Kähler cone condition [43], tuning on fluxed-instantons on the divisors [44,45] or putting the D-brane at the singularity [46][47][48][49][50][51][52][53]. In most of these approaches, finding Calabi-Yau threefolds with a non-trivial odd cohomology h 1,1 − (X/σ * ) is a crucial ingredient.…”

Section: Introductionmentioning

confidence: 99%

Orientifold Calabi-Yau Threefolds with Divisor Involutions and String Landscape

Altman,

Carifio,

Gao

et al. 2021

Preprint

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We establish an orientifold Calabi-Yau threefold database for h 1,1 (X) ≤ 6 by considering non-trivial Z 2 divisor exchange involutions, using a toric Calabi-Yau database (www.rossealtman.com/tcy). We first determine the topology for each individual divisor, then identify and classify the proper involutions which are globally consistent across all disjoint phases of the Kähler cone for each unique geometry. Each of the proper involutions will result in an orientifold Calabi-Yau manifold. Then we clarify all possible fixed loci under the proper involution, thereby determining the locations of different types of O-planes. It is shown that under the proper involutions, one typically ends up with a system of O3/O7-planes, and most of these will further admit naive Type IIB string vacua. The geometries with freely acting involutions are also determined. We further determine the splitting of the Hodge numbers into odd/even parity in the orbifold limit. The final result is a class of orientifold Calabi-Yau threefolds with non-trivial odd class cohomology (h 1,1 − (X/σ * ) = 0).

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The Standard Model Quiver in de Sitter String Compactifications

Abstract: at unibo.it, inaki.garcia-etxebarria at durham.ac.uk, fq201 at damtp.cam.ac.uk, as2673 at maths.cam.ac.uk, pramodmaths at gmail.com, roberto.valandro at ts.infn.it

Cited by 7 publications

References 118 publications

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

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

On the Search for Low $W_0$

Orientifold Calabi-Yau Threefolds with Divisor Involutions and String Landscape

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