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- W3119334204 abstract "A bstract We employ the techniques of the Functional Renormalization Group in string theory, in order to derive an effective mini-superspace action for cosmological backgrounds to all orders in the string scale α′ . To this end, T-duality plays a crucial role, classifying all perturbative curvature corrections in terms of a single function of the Hubble parameter. The resulting renormalization group equations admit an exact, albeit non-analytic, solution in any spacetime dimension D , which is however incompatible with Einstein gravity at low energies. Within an E -expansion about D = 2, we also find an analytic solution which exhibits a non-Gaussian ultraviolet fixed point with positive Newton coupling, as well as an acceptable low-energy limit. Yet, within polynomial truncations of the full theory space, we find no evidence for an analog of this solution in D = 4. Finally, we comment on potential cosmological implications of our findings." @default.
- W3119334204 created "2021-01-18" @default.
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- W3119334204 date "2021-06-01" @default.
- W3119334204 modified "2023-09-27" @default.
- W3119334204 title "Cosmological α′-corrections from the functional renormalization group" @default.
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- W3119334204 doi "https://doi.org/10.1007/jhep06(2021)045" @default.
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