Spectator dark matter in nonstandard cosmologies
作者： Catarina Cosme , Tommi Tenkanen
DOI: 10.1103/PHYSREVD.102.123534
关键词:
摘要: It has been shown that the observed dark matter (DM) abundance can be produced by amplification of quantum fluctuations an energetically subdominant scalar field during inflation. In this paper, we study robustness "spectator matter" scenario to changes in expansion rate early Universe. Compared standard radiation-dominated (RD) scenario, two aspects will change: DM energy density evolves differently as a function time, and also isocurvature perturbation spectrum different from result RD case. These impose sizeable values model parameters which allow constitute all while simultaneously satisfying observational constraints. We both free self-interacting scenarios with non-standard quantify cases cosmological history. discuss testability through primordial non-Gaussianity.
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