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| The existence of anomalous [[astrophysical]] and [[cosmological]] phenomena like the [[cosmic acceleration]] and the dynamics of [[clusters of galaxies]] and gas in [[galaxies]] themselves recently | | The name of mcdougal is Juan Dingler. What me and my family love is playing lacross but I'm thinking on starting something new. She is a human resources officer. Florida is where he and his [https://www.Vocabulary.com/dictionary/wife+live wife live] but he needs to run because of his families. My husband hence there is no maintain a web business. You might desire to check against each other here: http://www.apymeelhierro.org/moncler-online.asp<br><br>my web blog [http://www.apymeelhierro.org/moncler-online.asp Moncler Outlet] |
| boosted the growth of several long-range modifications of the usual laws of [[gravitation]]. Indeed, the aforementioned phenomena did not found satisfactorily explanations
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| in terms of the standard [[Isaac Newton|Newton]]–[[Albert Einstein|Einstein]] [[gravitational physics]], unless exotic and still undetected forms of [[matter]]-[[energy]] are postulated. Examples of such entities are, e.g., [[dark matter]] and [[dark energy]], identified with the [[Cosmological Constant]]. At galactic scales, the most famous modified model of gravity is, perhaps, the MOdified Newtonian Dynamics ([[MOND]]) proposed in 1983 by [[Mordehai Milgrom]].<ref>{{cite journal |last = Milgrom | first= M. |year = 1983 | title = A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis| journal = The Astrophysical Journal| volume = 270 |month = July | pages = 365–370 | doi = 10.1086/161130 | bibcode=1983ApJ...270..365M}}</ref> More recently, also the [[MOdified Gravity]] (MOG) by [[John Moffat (physicist)|John Moffat]] <ref>{{cite journal | last = Moffat |first = J.W. |title = Scalar–tensor–vector gravity theory | journal = Journal of Cosmology and Astroparticle Physics | year =2006. |volume = 3 | id= 004 | doi = 10.1088/1475-7516/2006/03/004 |arxiv = gr-qc/0506021 |bibcode = 2006JCAP...03..004M }}</ref> took place.
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| ==MOND and MOG==
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| While [[MOND]] modifies Newton's inverse square law at a characteristic [[acceleration]] scale <math>a_0\approx 1\times 10^{-10} {\rm m\ s}^{-2}</math>, MOG's modifications occur at large distances, i.e. MOG is a length scale-dependent model.
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| ==DGP model==
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| Another proposal to accommodate the [[cosmic acceleration]] without invoking the concept of [[dark energy]] is the multidimensional braneworld model by [[Gia Dvali]], [[Gregory Gabadadze]] and [[Massimo Porrati]] ([[DGP model]]). In it our ordinary space-time is a 3+1 dimensional brane embedded in a five-dimensional bulk space.
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| ==References==
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| {{Reflist}}
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| [[Category:Gravitation]]
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Latest revision as of 04:01, 15 November 2014
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