Decemeber 9, 14:15 in A315   

Shaun Hotchkiss (Helsinki)


Extreme galaxy clusters, the integrated Sachs-Wolfe effect and primordial gravitational waves

Abstract: What do these three subjects have in common? Nothing, but I couldn't choose between them. I will briefly explain why no galaxy clusters that have currently been measured show tension with the standard cosmological model, despite recent claims. I will then briefly show why a possible detection of the integrated Sachs-Wolfe effect does show significant tension. Finally I will briefly explain how the strictest form of the Lyth bound can be violated, thus allowing for small-field models that can generate observably large primordial gravitational waves. I will present an example of such a model that fits all current data.