Landscape of promising nonsupersymmetric string models

Perez-Martinez, R.; Ramos‐Sánchez, Saúl; Vaudrevange, Patrick K.S.

doi:10.1103/physrevd.104.046026

Cited by 14 publications

(13 citation statements)

References 94 publications

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“…It has been argued in [126,135] that low-energy SUSY may, in principle, not be required for the Yukawa couplings to be of the metaplectic form. Further, large classes of explicit string models similar to those presented in Section 5.5 with the exact spectrum of the SM and no SUSY have been built [155][156][157][158]. However, much more effort has to be devoted to better understand their details, including the stability of these models [157,159], the versions of discrete (traditional and modular) flavor symmetries that they exhibit, and hence the phenomenology they yield.…”

Section: Nonsupersymmetric Modular Flavor Symmetriesmentioning

confidence: 99%

Neutrino Flavor Model Building and the Origins of Flavor and CP Violation: A Snowmass White Paper

Almumin¹,

Chen²,

Cheng³

et al. 2022

Preprint

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The neutrino sector offers one of the most sensitive probes of new physics beyond the Standard Model of Particle Physics (SM). The mechanism of neutrino mass generation is still unknown. The observed suppression of neutrino masses hints at a large scale, conceivably of the order of the scale of a Grand Unified Theory (GUT), a unique feature of neutrinos that is not shared by the charged fermions. The origin of neutrino masses and mixing is part of the outstanding puzzle of fermion masses and mixings, which is not explained in the SM. Flavor model building for both quark and lepton sectors is important in order to gain a better understanding of the origin of the structure of mass hierarchy and flavor mixing, which constitute the dominant fraction of the SM parameters.Recent activities in neutrino flavor model building based on non-Abelian discrete flavor symmetries and modular flavor symmetries have been shown to be a promising direction to explore. The emerging models provide a framework that has a significantly reduced number of undetermined parameters in the flavor sector. In addition, such framework affords a novel origin of CP violation from group theory, due to the intimate connection between physical CP transformation and group theoretical properties of non-Abelian discrete groups.Model building based on non-Abelian discrete flavor symmetries and their modular variants enables the particle physics community to interpret the current and anticipated upcoming data from neutrino experiments. Non-Abelian discrete flavor symmetries and their modular variants can result from compactification of a higher-dimensional theory. Pursuit of flavor model building based on such frameworks thus also provides the connection to possible UV completions, in particular to string theory. We emphasize the importance of constructing models in which the uncertainties of theoretical predictions are smaller than, or at most compatible with, the error bars of measurements in neutrino experiments. While there exist proof-of-principle versions of bottom-up models in which the theoretical uncertainties are under control, it is remarkable that the key ingredients of such constructions were discovered first in top-down model building. We outline how a successful unification of bottom-up and top-down ideas and techniques may guide us towards a new era of precision flavor model building in which future experimental results can give us crucial insights in the UV completion of the SM.

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Section: Nonsupersymmetric Modular Flavor Symmetriesmentioning

confidence: 99%

Neutrino Flavor Model Building and the Origins of Flavor and CP Violation: A Snowmass White Paper

Almumin¹,

Chen²,

Cheng³

et al. 2022

Preprint

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show abstract

“…The twisted sectors of the Z 2 × Z 2 orbifold are determined by ℎ 1,2 and the projections 𝑔 1,2 . The complex right-moving fermions generating the 𝑆𝑂 (16) × 𝑆𝑂 (16) lattice are labeled by k and 𝜌 and their corresponding projections ℓ and 𝜎. The twists utilised in order to break the gauge symmetry and produce the observable Pati-Salam factor are then introduced via (𝐻, 𝐺) and (𝐻 ′ , 𝐺 ′ ).…”

Section: Pos(corfu2021)061mentioning

confidence: 99%

“…An important open problem in string phenomenology concerns the mechanism of spontaneous supersymmetry breaking and its physical consequences which has attracted considerable interest in recent literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. To this end, a tree-level analysis is insufficient for a quantitative comparison with low energy data, and the incorporation of quantum corrections to terms in the string effective action becomes a necessary yet daunting task.…”

Section: Introductionmentioning

confidence: 99%

On nonsupersymmetric Pati-Salam string models

Rizos¹,

Florakis²,

Violaris-Gountonis³

2022

Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021)

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“…in refs. [6][7][8][9][10]), although it was also proposed that phenomenologically viable models can be obtained by starting from ten-dimensional tachyonic string vacua [11][12][13][14][15][16]. By the construction, the 10D non-supersymmetric theories are discretely related to the 10D supersymmetric ones.…”

Section: Introductionmentioning

confidence: 99%

New non-supersymmetric heterotic string theory with reduced rank and exponential suppression of the cosmological constant

Nakajima¹

2023

Preprint

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We study the heterotic asymmetric orbifold model in which supersymmetry is broken by the stringy Schark-Schwarz mechanism. This model is a natural non-supersymmetric extension of CHL strings and can also be interpreted as the interpolating model between the E 8 × E ′ 8 theory and the non-supersymmetric E 8 theory. The enhancement of gauge groups, of which the rank is reduced to 8 + d, is explored. In particular, the enhancement to non-simply-laced groups is possible with d ≥ 2, as well as in the CHL model. We also give the conditions that the massless matter spectrum must satisfy. Moreover, the one-loop cosmological constant is evaluated in the regime where supersymmetry is asymptotically restored, and we show that the exponential suppression can occur unless d = 1.

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Landscape of promising nonsupersymmetric string models

Cited by 14 publications

References 94 publications

Neutrino Flavor Model Building and the Origins of Flavor and CP Violation: A Snowmass White Paper

Neutrino Flavor Model Building and the Origins of Flavor and CP Violation: A Snowmass White Paper

On nonsupersymmetric Pati-Salam string models

New non-supersymmetric heterotic string theory with reduced rank and exponential suppression of the cosmological constant

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