Sommaire:

Modern theories that aim at improving the theory of Einsten often induce effects that can be searched for at all scales. Indeed, many of them operate a change of the whole core theory (standard model of particle + general relativity) at the same time. In this seminar, I will show various phenomenological consequences of some of these theories in order to illustrate this. I shall notably show how a variation of the fundamental coupling constant follows from basic properties of the low-energy effective action of string theories, and what it may induce for the dynamics of the universe, as well as for various observable in the universe (such as the distance luminosity for instance), but also for the ratio between the time given by different atomic clocks, or for the universality of free fall. I shall show that one can also build interesting dark matter candidates from similar considerations, and test their presence with various probes. Along the way I shall also present some consequences alternative theories induce on gravitational waves, and how one can notably make use of gravitational wave detectors in order to constrain those alternatives.

Pour plus d'informations, merci de contacter Lavalle J.