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- Induced_gravity abstract "Induced gravity (or emergent gravity) is an idea in quantum gravity that space-time background emerges asa mean field approximation of underlying microscopic degrees of freedom, similar to the fluid mechanics approximation of Bose–Einstein condensates. The concept was originally proposed by Andrei Sakharov in 1967.Sakharov observed that many condensed matter systems give rise to emergent phenomena which are identical to general relativity. For example, crystal defects can look like curvature and torsion in an Einstein–Cartan spacetime. This allows one to create a theory of gravity with torsionfrom a World Crystal model of spacetime in which the lattice spacing is of the order of a Planck length.Sakharov's idea was to start with an arbitrary background pseudo-Riemannian manifold (in modern treatments, possibly with torsion) and introduce quantum fields (matter) on it but not introduce any gravitational dynamics explicitly. This gives rise to an effective action which to one-loop order contains the Einstein–Hilbert action with a cosmological constant. In other words, general relativity arises as an emergent property of matter fields and is not put in by hand. On the other hand, such models typically predict huge cosmological constants.Some argue that the particular models proposed by Sakharov and others have been proven impossible by the Weinberg–Witten theorem. But, models with emergent gravity are always possible as long as other things, such as spacetime dimensions, emerge together with gravity. Developments in AdS/CFT correspondence after 1997 suggest that the microphysical degrees of freedom in induced gravity might be radically different. The bulk space-time arises as an emergent phenomenon of the quantum degrees of freedom that live in the boundary of the space-time.".
- Induced_gravity wikiPageExternalLink 0710.4153.
- Induced_gravity wikiPageExternalLink 0204062v1.
- Induced_gravity wikiPageExternalLink berenstein.
- Induced_gravity wikiPageExternalLink lrr-2005-12.
- Induced_gravity wikiPageExternalLink sakharov.pdf.
- Induced_gravity wikiPageExternalLink mvf.pdf.
- Induced_gravity wikiPageID "1429237".
- Induced_gravity wikiPageRevisionID "598861088".
- Induced_gravity hasPhotoCollection Induced_gravity.
- Induced_gravity subject Category:Theories_of_gravitation.
- Induced_gravity type Abstraction100002137.
- Induced_gravity type Cognition100023271.
- Induced_gravity type Explanation105793000.
- Induced_gravity type HigherCognitiveProcess105770664.
- Induced_gravity type Process105701363.
- Induced_gravity type PsychologicalFeature100023100.
- Induced_gravity type ScientificTheory105993844.
- Induced_gravity type TheoriesOfGravitation.
- Induced_gravity type Theory105989479.
- Induced_gravity type TheoryOfGravitation105990089.
- Induced_gravity type Thinking105770926.
- Induced_gravity comment "Induced gravity (or emergent gravity) is an idea in quantum gravity that space-time background emerges asa mean field approximation of underlying microscopic degrees of freedom, similar to the fluid mechanics approximation of Bose–Einstein condensates. The concept was originally proposed by Andrei Sakharov in 1967.Sakharov observed that many condensed matter systems give rise to emergent phenomena which are identical to general relativity.".
- Induced_gravity label "Gravedad inducida".
- Induced_gravity label "Gravità indotta di Sakharov".
- Induced_gravity label "Induced gravity".
- Induced_gravity sameAs Gravedad_inducida.
- Induced_gravity sameAs Gravità_indotta_di_Sakharov.
- Induced_gravity sameAs m.050v2b.
- Induced_gravity sameAs Q608509.
- Induced_gravity sameAs Q608509.
- Induced_gravity sameAs Induced_gravity.
- Induced_gravity wasDerivedFrom Induced_gravity?oldid=598861088.
- Induced_gravity isPrimaryTopicOf Induced_gravity.