Supersymmetry breaking, brane dynamics and Swampland conjectures

Basile, Ivano

doi:10.1007/jhep10(2021)080

Cited by 24 publications

(34 citation statements)

References 123 publications

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“…for AdS p+2 × M q in the semiclassical limit N 1. After nucleation branes expand, and one can determine what forces they exert on each other computing static interaction potentials between parallel stacks [55,72]. One finds that branes with the same charges repel, consistently with the weak gravity [108] and repulsive force [109] conjectures.…”

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 70%

“…Our findings reveal that the breakdown of EFT at infinite distance involves either a KK tower arising from compact extra dimensions or higher-spin excitations of a D1-brane. The latter lies in a stringy regime that we approach holographically, and arises as the endpoint of a cascade of flux tunneling processes in unstable brane configurations driven by weak gravity [55,72]. Remarkably, in the Sugimoto model of [48] supersymmetry is restored, thereby granting stability as expected from the considerations of [73].…”

Section: Introductionmentioning

confidence: 87%

“…1. A heavy stack of D1-branes (in the orientifold models) or NS5-branes (in the heterotic model) sources a spacetime geometry whose near-horizon limit is an AdS × S throat [55,72]. One can expect branes on conical singularities to produce similar Freund-Rubin compactifications in this limit.…”

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 99%

“…Similarly, NS5branes in the heterotic model source an AdS 7 × S 3 throat [97]. All these geometries have no scale separation, and for a large number N of branes, where the EFT regime is expected to be reliable, the string coupling g s and the radius R of the internal S q scale according to [55,72,77,96]…”

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 99%

“…The interaction between branes in the presence of stringscale supersymmetry breaking is mediated by the gravitational tadpole. As as a result, the effective charge-to-tension ratio is renormalized by a O(1) factor, and like-charge branes exert mutually repulsive forces [55,72].…”

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 99%

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Emergent strings at infinite distance with broken supersymmetry

Basile¹

2022

Preprint

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We investigate the infinite-distance properties of families of unstable flux vacua in string theory with broken supersymmetry. To this end, we employ a generalized notion of distance in the moduli space and we build a holographic description for the non-perturbative regime of the tunneling cascade in terms of a renormalization group flow. In one limit we recover an exponentially light tower of Kaluza-Klein states, while in the opposite limit we find a tower of higher-spin excitations of D1-branes, realizing the emergent string proposal. In particular, the holographic description includes a free sector, whose emergent superconformal symmetry resonates with supersymmetric stability, the CFT distance conjecture and S-duality. We compute the anomalous dimensions of scalar vertex operators and single-trace higher-spin currents, finding an exponential suppression with the distance which is not generic from the renormalization group perspective, but appears specific to our settings.

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Section: Brane Dynamics and Weak Gravitymentioning

confidence: 70%

Section: Introductionmentioning

confidence: 87%

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 99%

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 99%

Section: Brane Dynamics and Weak Gravitymentioning

confidence: 99%

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Emergent strings at infinite distance with broken supersymmetry

Basile¹

2022

Preprint

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Modular invariance, misalignment and finiteness in non-supersymmetric strings

Cribiori

Parameswaran

Tonioni

et al. 2022

J. High Energ. Phys.

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In this article we show that finite perturbative corrections in non-supersymmetric strings can be understood via an interplay between modular invariance and misaligned supersymmetry. While modular invariance is known to be crucial in closed-string models, its presence and role for open strings is more subtle. Nevertheless, we argue that it leads to cancellations in physical quantities such as the one-loop cosmological constant and prevents them from diverging. In particular, we show that if the sector-averaged number of states does not grow exponentially, as predicted by misaligned supersymmetry, all exponential divergences in the one-loop cosmological constant cancel out as well. To account for the absence of power-law divergences, instead, we need to resort to the modular structure of the partition function. We finally comment on the presence of misaligned supersymmetry in the known 10-dimensional tachyon-free non-supersymmetric string theories.

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Emergence of species scale black hole horizons

Calderón-Infante,

Delgado,

Uranga

2024

J. High Energ. Phys.

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The scale at which quantum gravity becomes manifest, the species scale Λs, has recently been argued to take values parametrically lower than the Planck scale. We use black holes of vanishing horizon area (small black holes) in effective field theories coupled to quantum gravity to shed light on how the three different physical manifestations of the species scale Λs relate to each other. (i) Near the small black hole core, a scalar field runs to infinite distance in moduli space, a regime in which the Swampland Distance Conjecture predicts a tower of exponentially light states, which lower Λs. (ii) We integrate out modes in the tower and generate via Emergence a set of higher derivative corrections, showing that Λs is the scale at which such terms become relevant. (iii) Finally, higher derivative terms modify the black hole solution and grant it a non-zero, species scale sized stretched horizon of radius $$ {\Lambda}_s^{-1} $$ Λ s − 1 , showcasing the species scale as the size of the smallest possible black hole describable in the effective theory.We present explicit 4d examples of small black holes in 4d $$ \mathcal{N} $$ N = 2 supergravity, and the 10d example of type IIA D0-branes. The emergence of the species scale horizon for D0-branes requires a non-trivial interplay of different 8-derivative terms in type IIA and M-theory, providing a highly non-trivial check of our unified description of the different phenomena associated to the species scale.

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Supersymmetry breaking, brane dynamics and Swampland conjectures

Cited by 24 publications

References 123 publications

Emergent strings at infinite distance with broken supersymmetry

Emergent strings at infinite distance with broken supersymmetry

Modular invariance, misalignment and finiteness in non-supersymmetric strings

Emergence of species scale black hole horizons

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