The dark matter bispectrum from effective viscosity and one-particle irreducible vertices

Particle Dark Matter

There is plenty of evidence that most matter in the universe is dark (non–luminous). Particle physics offers several possible explanations. In this talk I focus on cold dark matter; the most promising candidates are then axions and the lightest supersymmetric particle. I briefly summarize estimates for the present relic density of these particles, and describe efforts to detect them. To appear ...

Dark Matter and Particle Physics

Astrophysicists now know that 80% of the matter in the universe is ‘dark matter’, composed of neutral and weakly interacting elementary particles that are not part of the Standard Model of particle physics. I will summarize the evidence for dark matter. I will explain why I expect dark matter particles to be produced at the CERN LHC. We will then need to characterize the new weakly interacting ...

Bulk Viscosity, Decaying Dark Matter, and the Cosmic Acceleration

We discuss a cosmology in which cold dark-matter particles decay into relativistic particles. We argue that such decays could lead naturally to a bulk viscosity in the cosmic fluid. For decay lifetimes comparable to the present hubble age, this bulk viscosity enters the cosmic energy equation as an effective negative pressure. We investigate whether this negative pressure is of sufficient magni...

Particle Dark Matter from Physics Beyond the Standard Model

So far the existence of the dark matter (DM) is our best experimental evidence for new physics beyond the Standard Model. The most recent WMAP data [1] confirm the standard cosmological model and precisely pin down the amount of cold dark matter as 0.094 < ΩCDMh 2 < 0.129, in accord with earlier indications. Nevertheless, the exact nature of the dark matter still remains a mystery, as all known...

Particle Candidates for Dark Matter