text: 256,199,1301383661489618945,1177063549606203394,Tommi Tenkanen,"My last paper is now out! Together with my collaborator Catarina Cosme we studied a scenario where the observed #DarkMatter is produced in the early universe by amplification of quantum fluctuations of a scalar field during cosmic inflation. <LINK> 1/3 In particular, we studied how the (free or self-interacting) dark matter abundance and its perturbation spectrum change if the early universe was not purely radiation dominated but there was a period of e.g. slow reheating after inflation, as is indeed possible. 2/3 We also discussed how the scenario could be further tested through primordial dark matter isocurvature and non-Gaussianity. It's not hopeless to test even purely gravitationally-interacting #DarkMatter! 3/3",https://arxiv.org/abs/2009.01149,"It has been shown that the observed dark matter (DM) abundance can be produced by amplification of quantum fluctuations of an energetically subdominant scalar field during inflation. In this paper, we study the robustness of this ""spectator dark matter"" scenario to changes in the expansion rate of the early Universe. Compared to the standard radiation-dominated (RD) scenario, two aspects will change: the DM energy density evolves differently as a function of time, and also the DM isocurvature perturbation spectrum will be different from the result in the RD case. These can impose sizeable changes to the values of model parameters which allow the field to constitute all DM while simultaneously satisfying all observational constraints. We study both free and self-interacting DM in scenarios with non-standard expansion and quantify the changes to the cases with a standard cosmological history. We also discuss testability of the scenario through primordial DM isocurvature and non-Gaussianity. ",Spectator dark matter in non-standard cosmologies,3,"['My last paper is now out! Together with my collaborator Catarina Cosme we studied a scenario where the observed #DarkMatter is produced in the early universe by amplification of quantum fluctuations of a scalar field during cosmic inflation. <LINK> 1/3', 'In particular, we studied how the (free or self-interacting) dark matter abundance and its perturbation spectrum change if the early universe was not purely radiation dominated but there was a period of e.g. slow reheating after inflation, as is indeed possible. 2/3', ""We also discussed how the scenario could be further tested through primordial dark matter isocurvature and non-Gaussianity. It's not hopeless to test even purely gravitationally-interacting #DarkMatter! 3/3""]",20,09,726