Speaker
Description
Freezing Gravity is a recently proposed dark energy framework that enables a stable crossing of the phantom divide, motivated by current observational interest in dynamical dark energy. Its key feature is the independent control of the cosmological background and linear perturbations, which allows arbitrary background evolutions while maintaining freedom from ghost and gradient instabilities.
The scalar degree of freedom propagates on small scales but becomes effectively frozen in the infrared limit, giving the model its name. In this poster, I will discuss further theoretical aspects of this framework, including its coupling to matter, the associated effective cutoff scale, possible strong-coupling issues, and the resulting phenomenological implications.