#### Universality classes for inflation and primordial GW from pseudoscalar inflation

- Event time: 2:00pm
- Event date: 17th May 2017
- Speaker: Mauro Pieroni (APC, Paris)
- Location: Higgs Centre Seminar Room, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

My seminar is divided in two parts:

In the first part of my seminar I propose a classification of inflationary models by using the most basic property of inflation: the approximate scaling invariance. This framework relies on the possibility of describing inflation in terms of a renormalization group equation. The slow rolling regime in this context is interpreted as the slow evolution close to a fixed point. In this framework we can thus explain in part the universality observed in the predictions of a certain number of inflationary models.

In the second part of my seminar I discuss the possibility of generating an observable gravitational wave (GW) background by coupling a pseudoscalar inflaton to some abelian gauge fields. The analysis is performed by dividing inflationary models into universality classes. One of the most promising scenarios is Starobinsky-like inflation, which may lead to observable signatures both in direct GW detectors as well as in upcoming CMB detectors. The complementarity between CMB and direct GW detection may be used to extract informations on the microphysics of inflation.

#### Event resources

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..