Analytic study of the supersymmetry-breaking scale at two loops

Motivated by the plethora of models, mainly remanant from superstring theories, in which several U(1) factors are present, we consider constraints on these theories from the requirement that non-perturbative, as opposed to perturbative, unification arises close to the Planck scale. We find that non-perturbative unification can be realized with three standard families up to a supersymmetry breaking scale of order 100–500 TeV and six supersymmetric families above that scale.

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Phase Transitions at High Supersymmetry Breaking Scale in String Theory

Springer Proceedings in Mathematics & Statistics - Lie Theory and Its Applications in Physics ◽

10.1007/978-981-15-7775-8_17 ◽

2020 ◽

pp. 265-274

Author(s):

Hervé Partouche ◽

Balthazar de Vaulchier

Keyword(s):

Phase Transitions ◽

String Theory ◽

Supersymmetry Breaking ◽

Breaking Scale

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Phase transition at high supersymmetry breaking scale in heterotic string theory

International Journal of Modern Physics A ◽

10.1142/s0217751x21410013 ◽

2021 ◽

pp. 2141001

Author(s):

Hervé Partouche ◽

Balthazar de Vaulchier

Keyword(s):

Phase Transition ◽

Phase Space ◽

Supersymmetry Breaking ◽

Space Structure ◽

Heterotic String ◽

Tree Level ◽

Heterotic String Theory ◽

Phase Space Structure ◽

Minkowski Space Time ◽

Breaking Scale

When supersymmetry is spontaneously broken at the tree level, the spectrum of the heterotic string compactified on orbifolds of tori contains an infinite number of potentially tachyonic modes. We show that this implies instabilities of Minkowski space–time, when the scale of supersymmetry breaking is of the order of the string scale. We derive the phase space structure of vacua in the case where the tachyonic spectrum contains a mode with trivial momenta and winding numbers along the internal directions not involved in the supersymmetry breaking.

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Naturalness in supersymmetry, or raising the supersymmetry breaking scale

Physics Letters B ◽

10.1016/0370-2693(90)90847-y ◽

1990 ◽

Vol 243 (3) ◽

pp. 250-256 ◽

Cited By ~ 184

Author(s):

Michael Dine ◽

Alex Kagan ◽

Stuart Samuel

Keyword(s):

Supersymmetry Breaking ◽

Breaking Scale

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A REVIEW OF DISTRIBUTIONS ON THE STRING LANDSCAPE

International Journal of Modern Physics A ◽

10.1142/s0217751x06033027 ◽

2006 ◽

Vol 21 (17) ◽

pp. 3441-3472 ◽

Cited By ~ 25

Author(s):

JASON KUMAR

Keyword(s):

Field Theory ◽

Statistical Analysis ◽

Cosmological Constant ◽

Supersymmetry Breaking ◽

Gauge Group ◽

Effective Field Theory ◽

Open String ◽

Effective Field ◽

Basic Flux ◽

Breaking Scale

We review some basic flux vacua counting techniques and results, focusing on the distributions of properties over different regions of the landscape of string vacua and assessing the phenomenological implications. The topics we discuss include: an overview of how moduli are stabilized and how vacua are counted; the applicability of effective field theory; the uses of and differences between probabilistic and statistical analysis (and the relation to the anthropic principle); the distribution of various parameters on the landscape, including cosmological constant, gauge group rank, and supersymmetry-breaking scale; "friendly landscapes;" open string moduli; the (in)finiteness of the number of phenomenologically viable vacua; etc. At all points, we attempt to connect this study to the phenomenology of vacua which are experimentally viable.

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