|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 listsDIAL seminars Graham Storey Lecture Seminars in Ageing Research
Other talks"You can't clear scrub and get chalk grassland unless ...." Forty years experience on the Devil's Ditch Diversity of mouse B cell memory subsets Nomic truth approximation by revising models and postulates in the light of increasing evidence The European ELT project New insights into anti-brane backreaction Recent developments in Open Access publishing (provisional title)