Description
This talk is based on arXiv:2512.10513 with Cedric Deffayet.
Nonlocal modifications of gravity derive from corrections to the quantum
gravitational stress tensor which grow nonperturbatively strong during
primordial inflation and may persist to the current epoch. Phenomenological
constructions have been given that realize MOND in gravitationally bound
systems and, separately, reproduce all the cosmological phenomena usually
ascribed to dark matter, including the cosmic microwave background radiation,
baryon acoustic oscillations and linearized structure formation. In this work
we exhibit a single model that interpolates between the two regimes.