Constraining SUSY with Heavy Scalars -- using the CMB

Abstract

If low-energy SUSY exists, LHC data favors a high mass scale for scalar superpartners (above a TeV), while sfermions and the dark matter can be parametrically lighter -- leading to a so-called split-spectrum. When combining this fact with the motivation from fundamental theory for shift-symmetric scalars (moduli) prior to SUSY breaking, this leads to a non-thermal history for the early universe. Such a history implies different expectations for the microscopic properties of dark matter, as well as the possibility of dark radiation and a cosmic axion background. In this paper we examine how correlated and mixed isocurvature perturbations are generated in such models, as well as the connection to dark radiation. WMAP constraints on multiple correlated isocurvature modes allow up to half of the primordial perturbations to be isocurvature, contrary to the case of a single isocurvature mode where perturbations must be dominantly adiabatic. However, such bounds are strongly prior dependent, and have not been investigated with the latest Planck data. In this paper we use the example of a SUSY non-thermal history to establish theoretical priors on cosmological parameters. Of particular interest, we find that priors on dark radiation are degenerate with those on the total amount of isocurvature -- they are inversely correlated. Dark radiation is tightly constrained in the early universe and has been used recently to place stringent constraints on string-based approaches to beyond the standard model. Our results suggest such constraints can require more input from theory. Data from cosmological probes -- such as Planck -- can help guide model building in models of the MSSM, split-SUSY, and beyond. Our model also demonstrates the utility of UV models in constructing cosmological priors. (abridged)

26 pages, 12 figures

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• Cosmological Moduli and the Post-Inflationary Universe: A Critical Review
• Non-thermal Histories and Implications for Structure Formation
• Future CMB tests of dark matter: ultra-light axions and massive neutrinos
• Tensor Detection Severely Constrains Axion Dark Matter
• Moduli Vacuum Misalignment and Precise Predictions in String Inflation
• Concentrated Dark Matter: Enhanced Small-scale Structure from Co-Decaying Dark Matter
• Dark Matter Production Mechanisms with a Non-Thermal Cosmological History - A Classification
• Lightish but clumpy: scalar dark matter from inflationary fluctuations
• Formation of Relativistic Axion Stars
• Higgscitement: Cosmological Dynamics of Fine Tuning
• Inflationary Constraints on Late Time Modulus Dominated Cosmology
• High-Scale Axions without Isocurvature from Inflationary Dynamics
• Confronting the Moduli-Induced LSP Problem
• Was the Universe Actually Radiation Dominated Prior to Nucleosynthesis?
• Inflationary Predictions and Moduli Masses
• Opening up a window on the postinflationary QCD axion
• New insights into axion freeze-in
• CMB lensing forecasts for constraining the primordial perturbations: adding to the CMB temperature and polarization information