Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant

Details Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant Very Light Cosmological Scalar Fields from a Tiny Cosmological Constant

2007-05-03

arxiv.org/abs/0705.0445v2

Phys.Rev.D76:083502,2007

Astronomy and Astrophysics

Astrophysics

11 pages

Scientific paper

10.1103/PhysRevD.76.083502

We discuss a mechanism which generates a mass term for 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.

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