Speaker
Dr
Xavier Calmet
(Université Libre de Bruxelles)
Description
We propose a new mechanism to generate the mass of a scalar field in an expanding universe. The mass of this field
turns out to be generated by the cosmological constant and can be naturally small if protected by a conformal
symmetry which is however broken in the gravitational sector. The mass is comparable today to the Hubble time.
This scalar field could thus impact our universe today and for example be at the origin of a time variation of the
couplings and masses of the parameters of the standard model. A time variation of the parameters of the standard
model would allow to test grand unified theories.
Author
Dr
Xavier Calmet
(Université Libre de Bruxelles)
