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

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

doi:10.1002/prop.202200008

Cited by 21 publications

(32 citation statements)

References 210 publications

(358 reference statements)

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“…Supersymmetry can be partially broken so that the low energy dynamics of the string theory are chiral, in agreement with the SM [15]. 5. String theory, in its final incarnation as described in the footnote, contains no free parameters and is unique [16].…”

Section: Introduction and Motivationsmentioning

confidence: 91%

“…where the last equality in Eq. (2.18) simply introduces shorthand notation and we have defined 5 ||Ω|| 2 := 1 3! Ω ijk Ωijk .…”

Section: Subsec 212)mentioning

confidence: 99%

“…In the following two section we explore the structure of M ks and M cs . 5 Again, in this shorthand notation, this definition really means ||Ω|| 2 := 1 3! Ω ijk Ωī k g īi g j g kk .…”

Section: Subsec 212)mentioning

confidence: 99%

“…This scalar potential is obtained from the usual dimensional reduction of the fluxed type IIA supergravity action 5 (further details are in App. B.4 and references therein).…”

Section: A More In-depth Look Into Achieving the Embeddingmentioning

confidence: 99%

“…Clearly, string theory represents a powerful framework 5 to unify SM and GR. However, there must be some work left to be done, otherwise theoretical physics would be solved.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

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Quadratic curvature corrections to stringy effective actions and the absence of de Sitter vacua

Cunillera,

Emond,

Lehébel

et al. 2021

Preprint

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We investigate the combined effect of fluxes and higher-order curvature corrections, in the form of the Gauss-Bonnet term, on the existence of de Sitter vacua in a heterotic string inspired framework, compactified on spheres and tori. We first gain some intuition on the effects of these corrections by studying a perturbative expansion in the small Gauss-Bonnet coupling. Then, for choices of potential closer to the string theory predictions, we show that the inclusion of quadratic curvature corrections actually reduces the parametric likelihood of de Sitter solutions. Contents 1 Introduction 1 2 Review of flux compactifications of the heterotic string action & stability conditions 43 Extending the Montero-van Riet-Venken bound in the small Gauss-Bonnet coupling limit 64 Non-perturbative conditions for the existence of de Sitter solutions with a Gauss-Bonnet term 9 4.1 Internal flux 11 4.2 External flux 13 4.2.1 q > 2/(n − 1) 13 4.2.2 q < 2/(n − 1) 14 4.2.3 q = 2/(n − 1) 155 Discussion 15

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Section: Introduction and Motivationsmentioning

confidence: 91%

“…where the last equality in Eq. (2.18) simply introduces shorthand notation and we have defined 5 ||Ω|| 2 := 1 3! Ω ijk Ωijk .…”

Section: Subsec 212)mentioning

confidence: 99%

Section: Subsec 212)mentioning

confidence: 99%

“…This scalar potential is obtained from the usual dimensional reduction of the fluxed type IIA supergravity action 5 (further details are in App. B.4 and references therein).…”

Section: A More In-depth Look Into Achieving the Embeddingmentioning

confidence: 99%

“…Clearly, string theory represents a powerful framework 5 to unify SM and GR. However, there must be some work left to be done, otherwise theoretical physics would be solved.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

See 3 more Smart Citations

Quadratic curvature corrections to stringy effective actions and the absence of de Sitter vacua

Cunillera,

Emond,

Lehébel

et al. 2021

Preprint

Self Cite

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Asymptotic Behavior of Saxion–Axion System in Stringy Quintessence Model

Seo

2024

Fortschritte der Physik

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The late time behavior of the slow‐roll parameter in the stringy quintessence model is studied when axion as well as saxion are allowed to move. Even though the potential is independent of the axion at tree level, the axion can move through its coupling to the saxion and the background geometry. Then the contributions of the axion kinetic energy to the slow‐roll parameter and the vacuum energy density are not negligible when the slow‐roll approximation does not hold. As the dimension of the field space is doubled, the fixed point at which the time variation of the slow‐roll parameter vanishes is not always stable. It is found that the fixed point in the saxion–axion system is at most partially stable, in particular when the volume modulus and the axio‐dilaton, the essential ingredients of the string compactification, are taken into account. It seems that as more saxion–axion pairs are considered, achieving the stability of the fixed point becomes difficult.

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A Stringy Perspective on the Coincidence Problem

Cunillera

Padilla

2023

Dark Energy

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We argue that, for string compactifications broadly consistent with swampland constraints, dark energy is likely to signal the beginning of the end of our universe as we know it, perhaps even through decompactification, with possible implications for the cosmological coincidence problem. Thanks to the scarcity (absence?) of stable de Sitter vacua, dark energy in string theory is assumed to take the form of a quintessence field in slow roll. As it rolls, a tower of heavy states will generically descend, triggering an apocalyptic phase transition in the low energy cosmological dynamics after at most a few hundred Hubble times. As a result, dark energy domination cannot continue indefinitely and there is at least a percentage chance that we find ourselves in the first Hubble epoch. We use a toy model of quintessence coupled to a tower of heavy states to explicitly demonstrate the breakdown in the cosmological dynamics as the tower becomes light. This occurs through a large number of corresponding particles being produced after a certain time, overwhelming quintessence. We also discuss some implications for early universe inflation.

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

Cited by 21 publications

References 210 publications

Quadratic curvature corrections to stringy effective actions and the absence of de Sitter vacua

Quadratic curvature corrections to stringy effective actions and the absence of de Sitter vacua

Asymptotic Behavior of Saxion–Axion System in Stringy Quintessence Model

A Stringy Perspective on the Coincidence Problem

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