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- DGP_model abstract "The DGP model is a model of gravity proposed by Gia Dvali, Gregory Gabadadze, and Massimo Porrati in 2000. The model is popular among some model builders, but has resisted being embedded into string theory.The model assumes the existence of a 4+1 dimensional Minkowski space, within which ordinary 3+1 dimensional Minkowski space is embedded. The model assumes an action consisting of two terms: One term is the usual Einstein–Hilbert action, which involves only the 4-D spacetime dimensions. The other term is the equivalent of the Einstein–Hilbert action, as extended to all 5 dimensions. The 4-D term dominates at short distances, and the 5-D term dominates at long distances.The model was proposed in part in order to reproduce the cosmic acceleration of dark energy without any need for a small but non-zero vacuum energy density. But critics argue that this branch of the theory is unstable. However, the theory remains interesting because of Dvali's claim that the unusual structure of the graviton propagator makes non-perturbative effects important in a seemingly linear regime, such as the solar system. Because there is no four-dimensional, linearized effective theory that reproduces the DGP model for weak-field gravity the theory avoids the vDVZ discontinuity that otherwise plagues attempts to write down a theory of massive gravity.In 2008, Fang et al. argued that recent cosmological observations (including measurements of baryon acoustic oscillations by the Sloan Digital Sky Survey, and measurements of the cosmic microwave background and type 1a supernovae) is in direct conflict with the DGP cosmology unless a cosmological constant or some other form of dark energy is added. However, this negates the appeal of the DGP cosmology, which accelerates without needing to add dark energy.".
- DGP_model wikiPageID "3791271".
- DGP_model wikiPageRevisionID "598869255".
- DGP_model hasPhotoCollection DGP_model.
- DGP_model subject Category:Theories_of_gravitation.
- DGP_model type Abstraction100002137.
- DGP_model type Cognition100023271.
- DGP_model type Explanation105793000.
- DGP_model type HigherCognitiveProcess105770664.
- DGP_model type Process105701363.
- DGP_model type PsychologicalFeature100023100.
- DGP_model type ScientificTheory105993844.
- DGP_model type TheoriesOfGravitation.
- DGP_model type Theory105989479.
- DGP_model type TheoryOfGravitation105990089.
- DGP_model type Thinking105770926.
- DGP_model comment "The DGP model is a model of gravity proposed by Gia Dvali, Gregory Gabadadze, and Massimo Porrati in 2000. The model is popular among some model builders, but has resisted being embedded into string theory.The model assumes the existence of a 4+1 dimensional Minkowski space, within which ordinary 3+1 dimensional Minkowski space is embedded. The model assumes an action consisting of two terms: One term is the usual Einstein–Hilbert action, which involves only the 4-D spacetime dimensions.".
- DGP_model label "DGP model".
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- DGP_model sameAs Q5204971.
- DGP_model sameAs Q5204971.
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- DGP_model wasDerivedFrom DGP_model?oldid=598869255.
- DGP_model isPrimaryTopicOf DGP_model.