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- Dark_energy abstract "In physical cosmology and astronomy, dark energy is a hypothetical form of energy that permeates all of space and tends to accelerate the expansion of the universe. Dark energy is the most accepted hypothesis to explain observations since the 1990s that indicate that the universe is expanding at an accelerating rate. According to the Planck mission team, and based on the standard model of cosmology, on a mass–energy equivalence basis the universe contains 26.8% dark matter and 68.3% dark energy (for a total of 95.1%) and 4.9% ordinary matter. Again on a mass–energy equivalence basis, the density of dark energy (1.67 × 10−27 kg/m3) is very low: in the solar system, it is estimated only 6 tons of dark energy would be found within the radius of Pluto's orbit. However, it comes to dominate the mass–energy of the universe because it is uniform across space.Two proposed forms for dark energy are the cosmological constant, a constant energy density filling space homogeneously, and scalar fields such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space. Contributions from scalar fields that are constant in space are usually also included in the cosmological constant. The cosmological constant can be formulated to be equivalent to vacuum energy. Scalar fields that do change in space can be difficult to distinguish from a cosmological constant because the change may be extremely slow.High-precision measurements of the expansion of the universe are required to understand how the expansion rate changes over time. In general relativity, the evolution of the expansion rate is parameterized by the cosmological equation of state (the relationship between temperature, pressure, and combined matter, energy, and vacuum energy density for any region of space). Measuring the equation of state for dark energy is one of the biggest efforts in observational cosmology today.Adding the cosmological constant to cosmology's standard FLRW metric leads to the Lambda-CDM model, which has been referred to as the "standard model" of cosmology because of its precise agreement with observations. Dark energy has been used as a crucial ingredient in a recent attempt to formulate a cyclic model for the universe.".
- Dark_energy wikiPageExternalLink ap020529.html.
- Dark_energy wikiPageExternalLink 0607066.
- Dark_energy wikiPageExternalLink 0609591.
- Dark_energy wikiPageExternalLink dark-energy-faq.
- Dark_energy wikiPageExternalLink press_121608.html.
- Dark_energy wikiPageExternalLink hetdex.org.
- Dark_energy wikiPageExternalLink dark_energy.
- Dark_energy wikiPageExternalLink jdem.gsfc.nasa.gov.
- Dark_energy wikiPageExternalLink 6156110.stm.
- Dark_energy wikiPageExternalLink dark-energy-how-the-paradigm-shifted.
- Dark_energy wikiPageExternalLink v38p3633.pdf.
- Dark_energy wikiPageExternalLink SNLS.
- Dark_energy wikiPageExternalLink 17dark.html?em&ex=1163998800&en=f02de71136ca5dd5&ei=5087%0A.
- Dark_energy wikiPageExternalLink Dark-Energy-The-Biggest-Mystery-in-the-Universe.html.
- Dark_energy wikiPageExternalLink www.darkenergysurvey.org.
- Dark_energy wikiPageID "19604228".
- Dark_energy wikiPageRevisionID "606791097".
- Dark_energy hasPhotoCollection Dark_energy.
- Dark_energy subject Category:Energy_(physics).
- Dark_energy subject Category:Physical_cosmology.
- Dark_energy subject Category:Unsolved_problems_in_astronomy.
- Dark_energy subject Category:Unsolved_problems_in_physics.
- Dark_energy type Abstraction100002137.
- Dark_energy type Attribute100024264.
- Dark_energy type Condition113920835.
- Dark_energy type Difficulty114408086.
- Dark_energy type Problem114410605.
- Dark_energy type State100024720.
- Dark_energy type UnsolvedProblemsInAstronomy.
- Dark_energy type UnsolvedProblemsInPhysics.
- Dark_energy comment "In physical cosmology and astronomy, dark energy is a hypothetical form of energy that permeates all of space and tends to accelerate the expansion of the universe. Dark energy is the most accepted hypothesis to explain observations since the 1990s that indicate that the universe is expanding at an accelerating rate.".
- Dark_energy label "Ciemna energia".
- Dark_energy label "Dark energy".
- Dark_energy label "Donkere energie".
- Dark_energy label "Dunkle Energie".
- Dark_energy label "Energia escura".
- Dark_energy label "Energia oscura".
- Dark_energy label "Energía oscura".
- Dark_energy label "Énergie sombre".
- Dark_energy label "Тёмная энергия".
- Dark_energy label "طاقة مظلمة".
- Dark_energy label "ダークエネルギー".
- Dark_energy label "暗能量".
- Dark_energy sameAs Temná_energie.
- Dark_energy sameAs Dunkle_Energie.
- Dark_energy sameAs Σκοτεινή_ενέργεια.
- Dark_energy sameAs Energía_oscura.
- Dark_energy sameAs Énergie_sombre.
- Dark_energy sameAs Energi_gelap.
- Dark_energy sameAs Energia_oscura.
- Dark_energy sameAs ダークエネルギー.
- Dark_energy sameAs 암흑_에너지.
- Dark_energy sameAs Donkere_energie.
- Dark_energy sameAs Ciemna_energia.
- Dark_energy sameAs Energia_escura.
- Dark_energy sameAs m.0lkzh.
- Dark_energy sameAs Q18343.
- Dark_energy sameAs Q18343.
- Dark_energy sameAs Dark_energy.
- Dark_energy wasDerivedFrom Dark_energy?oldid=606791097.
- Dark_energy isPrimaryTopicOf Dark_energy.