E ective Average Action and NonperturbativeRenormalization Group Equation in Higher
نویسندگان
چکیده
We investigate the exact renormalization group (RG) in R 2-gravity working in eeective average action formalism and background eld method. The truncated evolution equation (where truncation is made to low-derivatives functionals space) for such a theory on De Sitter background leads to the system of nonperturbative RG equations for cosmological and gravitational coupling constants. The gauge dependence problem is solved by working in physical Landau-De Witt gauge corresponding to gauge-xing independent eeective action. The approximate solution of nonperturbative RG equations shows the appearence of antiscreening or screening behaviour of newtonian coupling what depends on the higher derivatives coupling constants. The existence of unstable UV xed points is also mentioned.
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