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VOLUME 65 | ISSUE 8 | PAGE 571
Exact tenoimalization group and running" newtonian coupling in higher-derivative gravity
We discuss exact renormalization group (RG) in i22-gravity using effective average action formalism. The truncated evolution equation for such a theory on de Sitter background leads to the system of non perturbative RG equations for cosmological and gravitational coupling constants. Approximate solution of these RG equations shows the appearence of antiscreening and screening behaviour of Newtonian coupling what depends on higher-derivative coupling constants. PACS: 04.20-q