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I will describe a new model for inflation -

Chromo-Natural Inflation - consisting of an axionic scalar field coupled to a

set of three non-Abelian gauge fields. The model's novel requirement is that

the gauge fields begin inflation with a rotationally invariant vacuum

expectation value (VEV) that is preserved through identification of

SU(2) gauge invariance with rotations in three

dimensions. The gauge VEV interacts with the background value of the axion,

leading to an attractor solution that exhibits slow roll inflation even when

the axion decay constant has a natural value ($<M_{\rm Pl}$). Assuming a sinusoidal potential for the

axion, inflation continues until the axionic potential vanishes. The speed at

which the axion moves along its potential is modulated by its interactions with

the gauge VEV, rather than being determined by the slope of its potential. Of

the four free parameters in the theory, only one appears tuned: The parameter

that controls the interaction strength between the axion and the gauge fields

must be $\mathcal{O}$(100).

Event Type:

Seminar

Collection/Series:

Scientific Area(s):

Speaker(s):

Event Date:

Thursday, December 6, 2012 - 11:00 to 12:30

Location:

The Space Room (400)

©2012 Perimeter Institute for Theoretical Physics