Renormalization group scale-setting from the action—a road to modified gravity theories (CROSBI ID 186576)
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Podaci o odgovornosti
Domazet, Silvije ; Štefančić, Hrvoje
engleski
Renormalization group scale-setting from the action—a road to modified gravity theories
The renormalization group (RG) corrected gravitational action in Einstein– Hilbert and other truncations is considered. The running scale of the RG is treated as a scalar field at the level of the action and determined in a scale-setting procedure recently introduced by Koch and Ramirez for the Einstein–Hilbert truncation. The scale-setting procedure is elaborated for other truncations of the gravitational action and applied to several phenomenologically interesting cases. It is shown how the logarithmic dependence of the Newton’s coupling on the RG scale leads to exponentially suppressed effective cosmological constant and how the scale-setting in particular RG-corrected gravitational theories yields the effective f (R) modified gravity theories with negative powers of the Ricci scalar R. The scale-setting at the level of the action at the non-Gaussian fixed point in Einstein–Hilbert and more general truncations is shown to lead to universal effective action quadratic in the Ricci tensor.
renormalization group; modified gravity; cosmological constant
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Podaci o izdanju
29 (23)
2012.
35005-1-35005-8
objavljeno
0264-9381
10.1088/0264-9381/29/23/235005