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- Asymptotic_safety_in_quantum_gravity abstract "Asymptotic safety (sometimes also referred to as nonperturbative renormalizability) is a concept in quantum field theory which aims at finding a consistent and predictive quantum theory of the gravitational field. Its key ingredient is a nontrivial fixed point of the theory's renormalization group flow which controls the behavior of the coupling constants in the ultraviolet (UV) regime and renders physical quantities safe from divergences. Although originally proposed by Steven Weinberg to find a theory of quantum gravity, the idea of a nontrivial fixed point providing a possible UV completion can be applied also to other field theories, in particular to perturbatively nonrenormalizable ones.The essence of asymptotic safety is the observation that nontrivial renormalization group fixed points can be used to generalize the procedure of perturbative renormalization. In an asymptotically safe theory the couplings do not need to be small or tend to zero in the high energy limit but rather tend to finite values: they approach a nontrivial UV fixed point. The running of the coupling constants, i.e. their scale dependence described by the renormalization group (RG), is thus special in its UV limit in the sense that all their dimensionless combinations remain finite. This suffices to avoid unphysical divergences, e.g. in scattering amplitudes. The requirement of a UV fixed point restricts the form of the bare action and the values of the bare coupling constants, which become predictions of the asymptotic safety program rather than inputs.As for gravity, the standard procedure of perturbative renormalization fails since Newton's constant, the relevant expansion parameter, has negative mass dimension rendering general relativity perturbatively nonrenormalizable. This has driven the search for nonperturbative frameworks describing quantum gravity, including asymptotic safety which — in contrast to other approaches — is characterized by its use of quantum field theory methods, without depending on perturbative techniques, however. At the present time, there is accumulating evidence for a fixed point suitable for asymptotic safety, while a rigorous proof of its existence is still lacking.".
- Asymptotic_safety_in_quantum_gravity wikiPageExternalLink 1188567.
- Asymptotic_safety_in_quantum_gravity wikiPageExternalLink C09025.
- Asymptotic_safety_in_quantum_gravity wikiPageExternalLink lrr-2006-5.
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- Asymptotic_safety_in_quantum_gravity wikiPageExternalLink index.html.
- Asymptotic_safety_in_quantum_gravity wikiPageExternalLink www.scholarpedia.org.
- Asymptotic_safety_in_quantum_gravity wikiPageExternalLink Asymptotic_Safety_in_quantum_gravity.
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- Asymptotic_safety_in_quantum_gravity wikiPageID "37596615".
- Asymptotic_safety_in_quantum_gravity wikiPageRevisionID "606185189".
- Asymptotic_safety_in_quantum_gravity subject Category:Concepts_in_physics.
- Asymptotic_safety_in_quantum_gravity subject Category:Fixed_points_(mathematics).
- Asymptotic_safety_in_quantum_gravity subject Category:Physical_cosmology.
- Asymptotic_safety_in_quantum_gravity subject Category:Quantum_field_theory.
- Asymptotic_safety_in_quantum_gravity subject Category:Renormalization_group.
- Asymptotic_safety_in_quantum_gravity subject Category:Scaling_symmetries.
- Asymptotic_safety_in_quantum_gravity subject Category:Theoretical_physics.
- Asymptotic_safety_in_quantum_gravity comment "Asymptotic safety (sometimes also referred to as nonperturbative renormalizability) is a concept in quantum field theory which aims at finding a consistent and predictive quantum theory of the gravitational field. Its key ingredient is a nontrivial fixed point of the theory's renormalization group flow which controls the behavior of the coupling constants in the ultraviolet (UV) regime and renders physical quantities safe from divergences.".
- Asymptotic_safety_in_quantum_gravity label "Asymptotic safety in quantum gravity".
- Asymptotic_safety_in_quantum_gravity sameAs m.0w1dg88.
- Asymptotic_safety_in_quantum_gravity sameAs Q17004315.
- Asymptotic_safety_in_quantum_gravity sameAs Q17004315.
- Asymptotic_safety_in_quantum_gravity wasDerivedFrom Asymptotic_safety_in_quantum_gravity?oldid=606185189.
- Asymptotic_safety_in_quantum_gravity isPrimaryTopicOf Asymptotic_safety_in_quantum_gravity.