Stability and vacuum energy in open string models with broken supersymmetry

Abel, Steven; Dudas, Emilian; Lewis, Daniel C.; Partouche, Hervé

doi:10.1007/jhep10(2019)226

Cited by 20 publications

(36 citation statements)

References 111 publications

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“…As shown at the perturbative level in Ref. [12] , the configurations where all D-branes (rigid or not) in the orientifold picture are distributed on the O(D − 1)-planes correspond to extrema of the potential. In particular, let us denote with p At such local minima, the 1-loop effective potential takes the particularly simple form Finally, the numbers of massless states, which are given by and D = 5 more choices are expected to be non-perturbatively valid, reflecting the existence of the two or three branches of the moduli space.…”

Section: Orientifold Vacua Rigid Branes and Broken Supersymmetrymentioning

confidence: 82%

“…Before moving to the construction and analysis of heterotic models with reduced rank, let us review the main features of toroidal orientifold constructions with broken supersymmetry, free of tachyonic instabilities at 1-loop (provided M 1) [12], and that are expected to be consistent at the non-perturbative level [43].…”

Section: Orientifold Vacua Rigid Branes and Broken Supersymmetrymentioning

confidence: 99%

“…In the initial type I setup, this 8 In Ref. [12], only the condition that the O(32) bundle is an SO(32) bundle was imposed.…”

Section: Orientifold Vacua Rigid Branes and Broken Supersymmetrymentioning

confidence: 99%

“…In Refs [12,13], an interesting class of models that partially address these issues was analyzed 1 . It was considered in the context of the type I string theory compactified on tori, where supersymmetry is totally but spontaneously broken at a scale M , via a stringy version [15][16][17][18][19][20][21][22][23] of the Scherk-Schwarz mechanism [24].…”

Section: Introductionmentioning

confidence: 99%

“…2, we summarize the relevant features of the orientifold models of Ref. [12], whose open string moduli are stabilized at 1-loop when M 1. We also list the conditions valid in dimension D ≥ 5 [43] that are expected to guarantee the non-perturbative consistency of the models.…”

Section: Introductionmentioning

confidence: 99%

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Heterotic − type I dual pairs, rigid branes and broken SUSY

2020

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The moduli space of toroidal type I vacua, which are consistent at the nonperturbative level, consists of independent branches characterized by the number (0, 16 or 32) of rigid branes sitting on top of orientifold planes. This structure persists also when supersymmetry is spontaneously broken à la Scherk-Schwarz. We show that all the components of the moduli space in dimension D ≥ 5 indeed admit heterotic dual components, by explicitly constructing heterotic-type I dual pairs with the rank of the gauge group reduced by 0, 8 or 16 units. In the presence of spontaneous breaking of supersymmetry, the dual pairs we consider are also free of tachyonic instabilities at the one-loop level, provided the scale of supersymmetry breaking is lower than the string scale.

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Section: Orientifold Vacua Rigid Branes and Broken Supersymmetrymentioning

confidence: 82%

Section: Orientifold Vacua Rigid Branes and Broken Supersymmetrymentioning

confidence: 99%

“…In the initial type I setup, this 8 In Ref. [12], only the condition that the O(32) bundle is an SO(32) bundle was imposed.…”

Section: Orientifold Vacua Rigid Branes and Broken Supersymmetrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heterotic − type I dual pairs, rigid branes and broken SUSY

2020

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Pixelated Dark Energy

Heckman

Lawrie

Lin

et al. 2019

Fortschritte der Physik

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We study the phenomenology of a recent string construction with a quantum mechanically stable dark energy. A mild supersymmetry protects the vacuum energy but also allows O(10−100) TeV scale superpartner masses. The construction is holographic in the sense that the 4D spacetime is generated from “spacetime pixels” originating from five‐branes wrapped over metastable five‐cycles of the compactification. The cosmological constant scales as Λ∼1/N in the pixel number. An instability in the construction leads to cosmic expansion. This also causes more five‐branes to wind up in the geometry, leading to a slowly decreasing cosmological constant which we interpret as an epoch of inflation followed by (pre‐)heating when a rare event occurs in which the number of pixels increases by an order one fraction. The sudden appearance of radiation triggers an exponential increase in the number of pixels. Dark energy has a time varying equation of state with wa=−3normalΩm,0false(1+w0false)/2, which is compatible with current bounds, and could be constrained further by future data releases. The pixelated nature of the Universe also implies a large‐l cutoff on the angular power spectrum of cosmological observables with l max ∼Ofalse(Nfalse). We also use this pixel description to study the thermodynamics of de Sitter space, finding rough agreement with effective field theory considerations.

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Global anomalies & bordism of non-supersymmetric strings

Basile,

Debray,

Delgado

et al. 2024

J. High Energ. Phys.

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The three tachyon-free non-supersymmetric string theories in ten dimensions provide a handle on quantum gravity away from the supersymmetric lamppost. However, they have not been shown to be fully consistent; although local anomalies cancel due to versions of the Green-Schwarz mechanism, there could be global anomalies, not cancelled by the Green-Schwarz mechanism, that could become fatal pathologies. We compute the twisted string bordism groups that control these anomalies via the Adams spectral sequence, showing that they vanish completely in two out of three cases (Sugimoto and SO(16)2) and showing a partial vanishing also in the third (Sagnotti 0’B model). We also compute lower-dimensional bordism groups of the non-supersymmetric string theories, which are of interest to the classification of branes in these theories via the Cobordism Conjecture. We propose a worldvolume content based on anomaly inflow for the SO(16)2 NS5-brane, and discuss subtleties related to the torsion part of the Bianchi identity. As a byproduct of our techniques and analysis, we also reprove that the outer ℤ2 automorphism swapping the two E8 factors in the supersymmetric heterotic string is also non-anomalous.

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Stability and vacuum energy in open string models with broken supersymmetry

Cited by 20 publications

References 111 publications

Heterotic − type I dual pairs, rigid branes and broken SUSY

Heterotic − type I dual pairs, rigid branes and broken SUSY

Pixelated Dark Energy

Global anomalies & bordism of non-supersymmetric strings

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