Symmetron Inflation

Understand

We define a new inflationary scenario in which inflation starts naturally after the Big Bang when the energy density drops below some critical value.

• As a model, we use recently proposed symmetron field whose effective potential depends on the energy density of the environment.
• At high densities, right after the Big Bang, the potential for the symmetron is trivial, and the field sits in equilibrium at the bottom of the potential.
• When the density drops below some critical value, the potential changes its shape into a symmetry breaking potential, and the field starts rolling down.