Abstract
We discuss possible connections between several scales in particle physics andcosmology, such the the electroweak, inflation, dark energy and Planck scales. We thendescribe the phenomenology of a model of supersymmetry breaking in the presence ofa tiny (tunable) positive cosmological constant. The model is coupled to the MSSM, leading to calculable soft supersymmetry breaking masses and a distinct low energy phenomenologythat allows to differentiate it from other models of supersymmetry breakingand mediation mechanisms.
Highlights
We describe the phenomenology of a model of supersymmetry breaking in the presence of a tiny positive cosmological constant
The model is coupled to the minimal supersymmetric extension of the Standard Model (MSSM), leading to calculable soft supersymmetry breaking masses and a distinct low energy phenomenology that allows to differentiate it from other models of supersymmetry breaking and mediation mechanisms
If String Theory is a fundamental theory of Nature and not just a tool for studying systems with strongly coupled dynamics, it should be able to describe at the same time particle physics and cosmology, which are phenomena that involve very different scales from the microscopic four-dimensional (4d) quantum gravity length of 10−33 cm to large macroscopic distances of the size of the observable Universe ∼ 1028 cm spanned a region of about 60 orders of magnitude
Summary
If String Theory is a fundamental theory of Nature and not just a tool for studying systems with strongly coupled dynamics, it should be able to describe at the same time particle physics and cosmology, which are phenomena that involve very different scales from the microscopic four-dimensional (4d) quantum gravity length of 10−33 cm to large macroscopic distances of the size of the observable Universe ∼ 1028 cm spanned a region of about 60 orders of magnitude. These scales might be related via the scale of the underlying fundamental theory, such as string theory, or they might be independent in the sense that their origin could be based on different and independent dynamics An example of the former constrained and more predictive possibility is provided by TeV strings with a fundamental scale at low energies due for instance to large extra dimensions transverse to a four-dimensional braneworld forming our Universe [1]. At the quantum level, there is a Green-Schwarz term generated that amounts an extra dilaton dependent contribution to the gauge kinetic terms needed to cancel the anomalies of the R-symmetry This creates an apparent puzzle with the gaugino masses that vanish in the first representation but not in the latter. It turns out that gaugino masses are generated at the quantum level and are suppressed compared to the scalar masses (and A-terms)
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