Festina-Lente bound on Higgs vacuum structure and inflation

Lee, Sung Mook; Cheong, Dhong Yeon; Hyun, Sang Chul; Park, Seong Chan; Seo, Min-Seok

doi:10.1007/jhep02(2022)100

“…One very interesting avenue is studying the implication of the FL bound on inflation, as we have only scratched the surface in this work. See also [110,111] for recent work on this direction. As we have shown here, "theoretical" probes from the Swampland are highly complementary to the observational program already underway to detect the dark sector of our Universe.…”

Section: Discussionmentioning

confidence: 99%

Swampland Bounds on Dark Sectors

Muñoz¹,

Obied²

2022

Preprint

View full text Add to dashboard Cite

We use Swampland principles to theoretically disfavor regions of the parameter space of dark matter and other darkly charged particles that may exist. The Festina Lente bound, the analogue of the Weak-Gravity conjecture in de Sitter, places constraints on the mass and charge of dark particles, which here we show cover regions in parameter space that are currently allowed by observations. As a consequence, a broad set of new ultra-light particles are in the Swampland, independently of their cosmic abundance, showing the complementarity of Quantum Gravity limits with laboratory and astrophysical studies. In parallel, a Swampland bound on the UV cutoff associated to the axion giving a Stückelberg photon its longitudinal mode translates to a new constraint on the kinetic mixings and masses of dark photons. This covers part of the parameter space targeted by upcoming dark-photon direct-detection experiments. Moreover, it puts astrophysically interesting models in the Swampland, including freeze-in dark matter through an ultra-light dark photon, as well as radio models invoked to explain the 21-cm EDGES anomaly.

show abstract

“…2 Some implications of the original particle FL bound for inflation have been discussed in [22,23]. The impact of the particle FL bound on the Higgs vacuum structure and inflation was discussed in [26]. 3 It is crucial that we do not rely on T-duality as a Hubble constant / positive vacuum energy enters into our bound.…”

Section: Derivation Of the Fl Bound For Axionsmentioning

confidence: 99%

Axionic Festina Lente

Guidetti

¹

,

Righi

²

,

Venken

³

et al. 2023

J. High Energ. Phys.

View full text Add to dashboard Cite

The swampland conjecture known as Festina Lente (FL) imposes a lower bound on the mass of all charged particles in a quasi-de Sitter space. In this paper, we propose the aFL (axionic Festina Lente) bound, an extension of FL to axion-like particles arising from type II string theory. We find that the product of the instanton action and the axion decay constant is bounded from below by the vacuum energy. This is achieved indirectly, using dimensional reduction on Calabi-Yau threefolds, and translating the FL result for dipoles into a purely geometric bound. We discuss axionic black holes evolution, and aFL constraints on Euclidean wormholes, showing that the gravitational arguments leading to the FL bound for U(1) charged particles cannot be directly applied to axions. Moreover, we discuss phenomenological implications of the aFL bound, including constraints on string inflation models and the axion-photon coupling via kinetic mixing.

show abstract

“…One very interesting avenue is studying the implication of the FL bound on inflation, as we have only scratched the surface in this work. See also [111,112] for recent work on this direction.…”

Section: Jhep11(2022)121mentioning

confidence: 99%

Swampland bounds on dark sectors

Montero

¹

,

Muñoz

²

,

Obied

³

2022

J. High Energ. Phys.

View full text Add to dashboard Cite

We use Swampland principles to theoretically disfavor regions of the parameter space of dark matter and other darkly charged particles that may exist. The Festina Lente bound, the analogue of the Weak-Gravity conjecture in de Sitter, places constraints on the mass and charge of dark particles, which here we show cover regions in parameter space that are currently allowed by observations. As a consequence, a broad set of new ultra-light particles are in the Swampland, independently of their cosmic abundance, showing the complementarity of Quantum Gravity limits with laboratory and astrophysical studies. In parallel, a Swampland bound on the UV cutoff associated to the axion giving a Stückelberg photon its longitudinal mode translates to a new constraint on the kinetic mixings and masses of dark photons. This covers part of the parameter space targeted by upcoming dark-photon direct-detection experiments. Moreover, it puts astrophysically interesting models in the Swampland, including freeze-in dark matter through an ultra-light dark photon, as well as radio models invoked to explain the 21-cm EDGES anomaly.

show abstract

Festina-Lente bound on Higgs vacuum structure and inflation

Cited by 14 publications

References 36 publications

Swampland Bounds on Dark Sectors

Swampland Bounds on Dark Sectors

Axionic Festina Lente

Swampland bounds on dark sectors

Contact Info

Product

Resources

About