arXiv:1905.01214astro-ph.CO
Dark matter from scalar field fluctuations
Abstract
Dark matter (DM) may have its origin in a pre-Big Bang epoch, the cosmic inflation. Here, we consider for the first time a broad class of scenarios where a massive free scalar field unavoidably reaches an equilibrium between its classical and quantum dynamics in a characteristic time scale during inflation and sources the DM density. The study gives the abundance and perturbation spectrum of any DM component sourced by the scalar field. We show that this class of scenarios generically predicts enhanced structure formation, allowing one to test models where DM interacts with matter only gravitationally.
ArXiv link: https://arxiv.org/abs/1905.01214
ISLView on HNParent context
PDF on arXiv: https://arxiv.org/pdf/1905.01214.pdf
saagarjhaView on HNParent context
> Can anyone explain I'll try. The tl;dr is at the end before my own footnote. The author certainly doesn't make it easy, even for people familiar with the standard model of cosmology. The very first sentence of the paper [ https://arxiv.org/abs/1905.01214 ] reads, "Dark matter…
raattgiftView on HNParent context
The paper proposes that the entirety of dark matter is a massive free (as in non-interacting and non-self-interacting) field that appeared at the end of inflation, but before big bang nucleosynthesis ("BBN"). In order to make this work with observations of the cosmic microwave…
raattgiftView on HNParent context