Dark Energy from Inspiraling in Field Space

Understand

We find an exact solution of the equations of motion of a two-field cosmological model, which realizes multi-field dark energy.

• The latter is characterized by field-space trajectories with turning rates that are always large.
• We study a class of two-field models and show that it is possible to have such trajectories, giving accelerated space-time expansion, even when the scalar potential preserves the rotational invariance of the field-space metric.
• For the case of Poincar\'e-disk field space, we derive the form of the scalar potential compatible with such background solutions and, furthermore, we find the exact solutions analytically.