|COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring.|
Influence of heavy modes on perturbations in multiple field inflation
If you have a question about this talk, please contact Camille Bonvin.
We investigate linear cosmological perturbations in multiple field inflationary models where some of the directions are light while others are heavy (with respect to the Hubble parameter). By integrating out the massive degrees of freedom, we determine the multi-dimensional effective theory for the light degrees of freedom and give explicitly the propagation matrix that replaces the effective sound speed of the one-dimensional case. We then examine in detail the consequences of a sudden turn along the inflationary trajectory, in particular the possible breakdown of the low energy effective theory in case the heavy modes are excited. Resorting to a new basis in field space, instead of the usual adiabatic/entropic basis, we study the evolution of the perturbations during the turn. In particular, we compute the power spectrum and compare with the result obtained from the low energy effective theory.
This talk is part of the Cosmology lunch series.
This talk is included in these lists:
Note that ex-directory lists are not shown.
Other listsCambridge Hi-tech Cluster and the Creative Industries Centenary Year of the Medical Research Council and International Year of Statistics bdj50: Conference on the past, present and future of Josephson Physics
Other talksCambridge Immunology Forum 2014 Fowling things up for avian flu - transgenic intervention as an approach to combatting influenza infection in livestock. Festival of Ideas and Curating Cambridge Launch Stability and breakup of liquid threads Tumour natural history, structure and nomenclature (lecture/demonstration) Recent Advances in Sheep Lameness Management and Beliefs of Veterinarians and Farmers