Induced cosmological anisotropy by a gauge-gravity interaction

Understand

We present a simple model which generates cosmological anisotropies on top of standard FLRW geometry.

• This is in some sense reminiscent of the mean field approximation, where the mean field cosmological model under consideration would be the standard FLRW, and the anisotropy is a small perturbative correction on top of it.
• Using a supergravity-inspired model, we confirm that the stable fixed point of our model corresponds to standard FLRW cosmology.
• We use a Bianchi VII$_0$-type model supplemented with a scalar and $U(1)$ gauge fields, and we show that the anisotropies of the geometry are generated by the non-trivial interaction between the gravity sector and the $U(1)$ gauge sector.