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• Metric_expansion_of_space abstract "The metric expansion of space is the increase of the distance between two distant parts of the universe with time. It is an intrinsic expansion whereby the scale of space itself changes. This is different from other examples of expansions and explosions in that, as far as observations can ascertain, it is a property of the entirety of the universe rather than a phenomenon that can be contained and observed from the outside.Metric expansion is a key feature of Big Bang cosmology, is modeled mathematically with the FLRW metric, and is a generic property of the Universe we inhabit. However, the model is valid only on large scales (roughly the scale of galaxy clusters and above). At smaller scales matter has become bound together under the influence of gravitational attraction and such things do not expand at the metric expansion rate as the Universe ages. As such, the only galaxies receding from one another as a result of metric expansion are those separated by cosmologically relevant scales larger than the length scales associated with the gravitational collapse that are possible in the age of the Universe given the matter density and average expansion rate.At the end of the early universe's inflationary period, all the matter and energy in the Universe was set on an inertial trajectory consistent with the equivalence principle and Einstein's general theory of relativity and this is when the precise and regular form of the universe's expansion had its origin (that is, matter in the Universe is separating because it was separating in the past due to the inflaton field).According to measurements, the Universe's expansion rate was decelerating until about 5 billion years ago due to the gravitational attraction of the matter content of the Universe, after which time the expansion began accelerating. In order to explain the acceleration, physicists have postulated the existence of dark energy which appears in the simplest theoretical models as a cosmological constant. According to the simplest extrapolation of the currently-favored cosmological model (known as "ΛCDM"), this acceleration becomes more dominant into the future.While special relativity prohibits objects from moving faster than light with respect to a local reference frame where spacetime can be treated as flat and unchanging, it does not apply to situations where spacetime curvature or evolution in time become important. These situations are described by general relativity, which allows the separation between two distant objects to increase faster than the speed of light. For example, galaxies that are more than the Hubble radius, approximately 4.5 gigaparsecs or 14.7 billion light-years, away from us have a recession speed that is faster than the speed of light. Visibility of these objects depends on the exact expansion history of the Universe. Light that is emitted today from galaxies beyond the cosmological event horizon, about 5 gigaparsecs or 16 billion light-years, will never reach us, although we can still see the light that these galaxies emitted in the past.Because of the high rate of expansion, it is also possible for a distance between two objects to be greater than the value calculated by multiplying the speed of light by the age of the Universe. These details are a frequent source of confusion among amateurs and even professional physicists.Due to the non-intuitive nature of the subject and what has been described by some as "careless" choices of wording, certain descriptions of the metric expansion of space and the misconceptions to which such descriptions can lead are an ongoing subject of discussion in the realm of pedagogy and communication of scientific concepts.".
• Metric_expansion_of_space thumbnail Expansion_of_the_Universe_-_distance_measures_problem.gif?width=300.
• Metric_expansion_of_space wikiPageExternalLink hubble.html.
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• Metric_expansion_of_space wikiPageExternalLink cosmo.html.
• Metric_expansion_of_space wikiPageExternalLink phy00812.htm.
• Metric_expansion_of_space wikiPageExternalLink the-big-bang.php.
• Metric_expansion_of_space wikiPageExternalLink misconceptions-about-the-2005-03.
• Metric_expansion_of_space wikiPageExternalLink expansion.
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• Metric_expansion_of_space wikiPageRevisionID "682684540".
• Metric_expansion_of_space wikiPageWikiLink A_priori_and_a_posteriori.
• Metric_expansion_of_space wikiPageWikiLink Accelerating_universe.
• Metric_expansion_of_space wikiPageWikiLink Acceleration.
• Metric_expansion_of_space wikiPageWikiLink Age_of_the_Earth.
• Metric_expansion_of_space wikiPageWikiLink Age_of_the_Universe.
• Metric_expansion_of_space wikiPageWikiLink Age_of_the_universe.
• Metric_expansion_of_space wikiPageWikiLink Airline.
• Metric_expansion_of_space wikiPageWikiLink Albert_Einstein.
• Metric_expansion_of_space wikiPageWikiLink Alexander_Friedman.
• Metric_expansion_of_space wikiPageWikiLink Alexander_Friedmann.
• Metric_expansion_of_space wikiPageWikiLink Ant_on_a_rubber_rope.
• Metric_expansion_of_space wikiPageWikiLink Atom.
• Metric_expansion_of_space wikiPageWikiLink Big_Bang.
• Metric_expansion_of_space wikiPageWikiLink Big_Bang_cosmology.
• Metric_expansion_of_space wikiPageWikiLink Big_Crunch.
• Metric_expansion_of_space wikiPageWikiLink Cartesian_coordinate_system.
• Metric_expansion_of_space wikiPageWikiLink Category:Big_Bang.
• Metric_expansion_of_space wikiPageWikiLink Category:General_relativity.
• Metric_expansion_of_space wikiPageWikiLink Category:Physical_cosmology.
• Metric_expansion_of_space wikiPageWikiLink Cepheid_variable.
• Metric_expansion_of_space wikiPageWikiLink Chronology_of_the_universe.
• Metric_expansion_of_space wikiPageWikiLink Comoving_coordinates.
• Metric_expansion_of_space wikiPageWikiLink Comoving_distance.
• Metric_expansion_of_space wikiPageWikiLink Compact_space.
• Metric_expansion_of_space wikiPageWikiLink Coordinate.
• Metric_expansion_of_space wikiPageWikiLink Coordinate_system.
• Metric_expansion_of_space wikiPageWikiLink Copernican_Principle.
• Metric_expansion_of_space wikiPageWikiLink Copernican_principle.
• Metric_expansion_of_space wikiPageWikiLink Cosmic_distance_ladder.
• Metric_expansion_of_space wikiPageWikiLink Cosmic_inflation.
• Metric_expansion_of_space wikiPageWikiLink Cosmic_microwave_background.
• Metric_expansion_of_space wikiPageWikiLink Cosmic_time.
• Metric_expansion_of_space wikiPageWikiLink Cosmological_Principle.
• Metric_expansion_of_space wikiPageWikiLink Cosmological_constant.
• Metric_expansion_of_space wikiPageWikiLink Cosmological_horizon.
• Metric_expansion_of_space wikiPageWikiLink Cosmological_principle.
• Metric_expansion_of_space wikiPageWikiLink Cosmological_time.
• Metric_expansion_of_space wikiPageWikiLink Cosmology.
• Metric_expansion_of_space wikiPageWikiLink Curvature.
• Metric_expansion_of_space wikiPageWikiLink Dark_energy.
• Metric_expansion_of_space wikiPageWikiLink Deceleration_parameter.
• Metric_expansion_of_space wikiPageWikiLink Density.
• Metric_expansion_of_space wikiPageWikiLink Density_parameter.
• Metric_expansion_of_space wikiPageWikiLink Differential_geometry.
• Metric_expansion_of_space wikiPageWikiLink Dimension.
• Metric_expansion_of_space wikiPageWikiLink Distance.
• Metric_expansion_of_space wikiPageWikiLink Distance_measures_(cosmology).
• Metric_expansion_of_space wikiPageWikiLink Dynamics_(mechanics).
• Metric_expansion_of_space wikiPageWikiLink Dynamics_(physics).
• Metric_expansion_of_space wikiPageWikiLink Early_universe.
• Metric_expansion_of_space wikiPageWikiLink Edwin_Hubble.
• Metric_expansion_of_space wikiPageWikiLink Einstein_field_equations.
• Metric_expansion_of_space wikiPageWikiLink Electromagnetic_radiation.
• Metric_expansion_of_space wikiPageWikiLink Electromagnetic_spectrum.
• Metric_expansion_of_space wikiPageWikiLink Embedding.
• Metric_expansion_of_space wikiPageWikiLink End_of_Greatness.
• Metric_expansion_of_space wikiPageWikiLink Equivalence_principle.
• Metric_expansion_of_space wikiPageWikiLink Euclidean_geometry.
• Metric_expansion_of_space wikiPageWikiLink European_Southern_Observatory.
• Metric_expansion_of_space wikiPageWikiLink Event_(relativity).
• Metric_expansion_of_space wikiPageWikiLink Explosion.
• Metric_expansion_of_space wikiPageWikiLink Exponential_growth.
• Metric_expansion_of_space wikiPageWikiLink FLRW_metric.
• Metric_expansion_of_space wikiPageWikiLink False_vacuum.
• Metric_expansion_of_space wikiPageWikiLink File:CMB_Timeline300_no_WMAP.jpg.
• Metric_expansion_of_space wikiPageWikiLink Formula.
• Metric_expansion_of_space wikiPageWikiLink Frame-dragging.
• Metric_expansion_of_space wikiPageWikiLink Frame_dragging.
• Metric_expansion_of_space wikiPageWikiLink Friedmann_equations.
• Metric_expansion_of_space wikiPageWikiLink Friedmann–Lemaître–Robertson–Walker_metric.
• Metric_expansion_of_space wikiPageWikiLink Function_(mathematics).
• Metric_expansion_of_space wikiPageWikiLink Galaxy.
• Metric_expansion_of_space wikiPageWikiLink Galaxy_cluster.
• Metric_expansion_of_space wikiPageWikiLink Gamma-ray_burst.
• Metric_expansion_of_space wikiPageWikiLink General_relativity.
• Metric_expansion_of_space wikiPageWikiLink General_theory_of_relativity.
• Metric_expansion_of_space wikiPageWikiLink Geodesic.
• Metric_expansion_of_space wikiPageWikiLink Gigaparsec.
• Metric_expansion_of_space wikiPageWikiLink Gnomonic_projection.
• Metric_expansion_of_space wikiPageWikiLink Gravity.
• Metric_expansion_of_space wikiPageWikiLink Great_Attractor.
• Metric_expansion_of_space wikiPageWikiLink Great_circle.
• Metric_expansion_of_space wikiPageWikiLink Gödel_metric.
• Metric_expansion_of_space wikiPageWikiLink HII_regions.
• Metric_expansion_of_space wikiPageWikiLink H_II_region.
• Metric_expansion_of_space wikiPageWikiLink Hubble_Constant.

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