（ABSTRACT）

The talk will focus on possible cosmological consequences of a running Newton’s constant G(d’Alembertian), as suggested by the nontrivial ultraviolet fixed point scenario in the quantum field-theoretic treatment of Einstein gravity with a cosmological constant term.
I will first review the main results coming from the study of the renormalization group in quantum field theories in order to motivate the formulation of a running G. I will then go on to discuss possible effects a scale-dependent coupling might have on large scale cosmological density perturbations and on the cosmological slip function.

Reference:
H. W. Hamber and R. Toriumi, Phys. Rev. D 82 (2010) 043518, arXiv:1006.5214 [gr-qc].