## Matin Mojaza (19/02/16)

Math Colloquium

### Speaker: Matin Mojaza

Title: Soft dilatons: In gravity and from conformal field theory

Location: V-148, VRII.

Time: Friday, February 19 at 11:00.

### Abstract:

In this talk I will discuss the soft factorizing properties of two seemingly different particles, which are in the literature both referred to as dilatons; i.e. the dilaton in theories of gravity appearing e.g. in string theory and supergravity as the scalar partner of the graviton, and the dilaton appearing as the Nambu-Goldstone boson in theories of spontaneously broken conformal symmetry.

I will in particular show that tree level, on-shell gauge invariance can be used to fully determine the leading, sub-leading, and sub-sub-leading behaviors of soft gravitons as well as soft “gravity dilatons”, and that Ward-identies of conformal symmetry fully determine the leading, sub-leading, and sub-sub-leading behaviors of soft Nambu-Goldstone dilatons.

I will finally discuss the relation between the soft behavior of gravity dilatons and Nambu-Goldstone dilatons.