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Updated: Aug 21, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Initial conditions of the universe: how much isocurvature is allowed?
M Bucher1, J Dunkley, P G Ferreira
1DAMTP, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom.
Abstract:
We investigate the constraints imposed by current data on correlated mixtures of adiabatic and nonadiabatic primordial perturbations. We discover subtle flat directions in parameter space that tolerate large (approximately 60%) fractions of nonadiabatic fluctuations. In particular, larger values of the baryon density and a spectral tilt are allowed. The cancellations in the degenerate directions are explored and the role of priors is elucidated.
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