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- Zeldovich_pancake abstract "A Zeldovich pancake is a theoretical condensation of gas out of a primordial density fluctuation following the Big Bang. In 1970, Yakov B. Zel'dovich showed that for an ellipsoid of gas on a supergalactic scale, an approximation can be used that will model the collapse as occurring most rapidly along the shortest axis, resulting in a pancake form. This approximation assumes that the ellipsoid of gas is sufficiently large that the effect of pressure is negligible and only gravitational attraction needs to be considered. That is, the gas will collapse without being significantly perturbed by outward pressure. This assumption is especially valid if the collapse occurs before the recombination era that resulted in the formation of hydrogen atoms.In 1989, Zel'dovich and S. F. Shandarin showed that initial overlapping density fluctuations of random Gaussian fields would result in "dense pancakes, filaments, and compact clumps of matter". This model became known as a top-down model ofgalactic formation, with the supergalactic condensationfragmenting into protogalaxies. The formation of plane concentrations would compress the gas through shock waves generated during the collapse, increasing the temperature.At a higher level, the collapse of larger structures according to the Zel'dovich Approximation is known as second-generation pancakes or superpancakes. At still higher levels there is a transition to a hierarchical clustering model in which a hierarchy of collapsing structures exist. The Truncated Zel'dovich Approximation allowed the method to be applied to these hierarchical, or bottom-up models of cosmological structure. This approach truncates the power law fluctuation spectrum at large values of k before applying the Zel'dovich Approximation. Generalizations of the Zel'dovich Approximation have also been shown to apply in the case of a non-zero cosmological constant.The first example of a Zeldovich pancake may have been identified in 1991 using the Very Large Array in New Mexico.".
- Zeldovich_pancake wikiPageID "22498377".
- Zeldovich_pancake wikiPageLength "5116".
- Zeldovich_pancake wikiPageOutDegree "18".
- Zeldovich_pancake wikiPageRevisionID "677050012".
- Zeldovich_pancake wikiPageWikiLink Baryon_acoustic_oscillations.
- Zeldovich_pancake wikiPageWikiLink Big_Bang.
- Zeldovich_pancake wikiPageWikiLink Category:Large-scale_structure_of_the_cosmos.
- Zeldovich_pancake wikiPageWikiLink Cosmological_constant.
- Zeldovich_pancake wikiPageWikiLink Ellipsoid.
- Zeldovich_pancake wikiPageWikiLink Galactic_orientation.
- Zeldovich_pancake wikiPageWikiLink Gravity.
- Zeldovich_pancake wikiPageWikiLink Hydrogen.
- Zeldovich_pancake wikiPageWikiLink Karl_G._Jansky_Very_Large_Array.
- Zeldovich_pancake wikiPageWikiLink Lyman-alpha_blob.
- Zeldovich_pancake wikiPageWikiLink New_Mexico.
- Zeldovich_pancake wikiPageWikiLink Recombination_(cosmology).
- Zeldovich_pancake wikiPageWikiLink Shock_wave.
- Zeldovich_pancake wikiPageWikiLink Very_Large_Array.
- Zeldovich_pancake wikiPageWikiLink Wikt:primordial.
- Zeldovich_pancake wikiPageWikiLink Wikt:supergalaxy.
- Zeldovich_pancake wikiPageWikiLink Yakov_Borisovich_Zeldovich.
- Zeldovich_pancake wikiPageWikiLink Zeldovich_Approximation.
- Zeldovich_pancake wikiPageWikiLinkText "Zeldovich pancake".
- Zeldovich_pancake hasPhotoCollection Zeldovich_pancake.
- Zeldovich_pancake wikiPageUsesTemplate Template:Reflist.
- Zeldovich_pancake subject Category:Large-scale_structure_of_the_cosmos.
- Zeldovich_pancake hypernym Condensation.
- Zeldovich_pancake type AnatomicalStructure.
- Zeldovich_pancake comment "A Zeldovich pancake is a theoretical condensation of gas out of a primordial density fluctuation following the Big Bang. In 1970, Yakov B. Zel'dovich showed that for an ellipsoid of gas on a supergalactic scale, an approximation can be used that will model the collapse as occurring most rapidly along the shortest axis, resulting in a pancake form.".
- Zeldovich_pancake label "Zeldovich pancake".
- Zeldovich_pancake sameAs Crêpe_de_Zeldovitch.
- Zeldovich_pancake sameAs m.05zl3wj.
- Zeldovich_pancake sameAs Zeldovičeva_palačinka.
- Zeldovich_pancake sameAs Q3006333.
- Zeldovich_pancake sameAs Q3006333.
- Zeldovich_pancake wasDerivedFrom Zeldovich_pancake?oldid=677050012.
- Zeldovich_pancake isPrimaryTopicOf Zeldovich_pancake.