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arXiv · 1509.05850

Large Blue Spectral Isocurvature Spectral Index Signals Time-Dependent Mass

Daniel J. H. Chung
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Abstract

We show that if a spectator linear isocurvature dark matter field degree of freedom has a constant mass through its entire evolution history, the maximum measurable isocurvature spectral index that is consistent with the current tensor-to-scalar ratio bound is about 2.4, even if experiments can be sensitive to a $10^{-6}$ contamination of the predominantly adiabatic power spectrum with an isocurvature power spectrum at the shortest observable length scales. Hence, any foreseeable future measurement of a blue isocurvature spectral index larger than about 2.4 may provide nontrivial evidence for dynamical degrees of freedom with time-dependent masses during inflation. The bound is not sensitive to the details of the reheating scenario and can be made mildly smaller if the tensor-to-scalar ratio is better constrained in the future.

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Daniel J. H. Chung. 2015-09-19. Large Blue Spectral Isocurvature Spectral Index Signals Time-Dependent Mass. https://doi.org/10.1103/physrevd.94.043524

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