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- Casimir_effect abstract "In quantum field theory, the Casimir effect and the Casimir–Polder force are physical forces arising from a quantized field. They are named after the Dutch physicist Hendrik Casimir.The typical example is of two uncharged metallic plates in a vacuum, placed a few nanometers apart. In a classical description, the lack of an external field also means that there is no field between the plates, and no force would be measured between them. When this field is instead studied using the QED vacuum of quantum electrodynamics, it is seen that the plates do affect the virtual photons which constitute the field, and generate a net force—either an attraction or a repulsion depending on the specific arrangement of the two plates. Although the Casimir effect can be expressed in terms of virtual particles interacting with the objects, it is best described and more easily calculated in terms of the zero-point energy of a quantized field in the intervening space between the objects. This force has been measured, and is a striking example of an effect captured formally by second quantization. However, the treatment of boundary conditions in these calculations has led to some controversy.In fact "Casimir's original goal was to compute the van der Waals force between polarizable molecules" of the metallic plates. Thus it can be interpreted without any reference to the zero-point energy (vacuum energy) of quantum fields.Dutch physicists Hendrik B. G. Casimir and Dirk Polder at Philips Research Labs proposed the existence of a force between two polarizable atoms and between such an atom and a conducting plate in 1947, and, after a conversation with Niels Bohr who suggested it had something to do with zero-point energy, Casimir alone formulated the theory predicting a force between neutral conducting plates in 1948; the former is called the Casimir–Polder force while the latter is the Casimir effect in the narrow sense. Predictions of the force were later extended to finite-conductivity metals and dielectrics by Lifshitz and his students, and recent calculations have considered more general geometries. It was not until 1997, however, that a direct experiment, by S. Lamoreaux, described above, quantitatively measured the force (to within 15% of the value predicted by the theory), although previous work [e.g. van Blockland and Overbeek (1978)] had observed the force qualitatively, and indirect validation of the predicted Casimir energy had been made by measuring the thickness of liquid helium films by Sabisky and Anderson in 1972. Subsequent experiments approach an accuracy of a few percent.Because the strength of the force falls off rapidly with distance, it is measurable only when the distance between the objects is extremely small. On a submicron scale, this force becomes so strong that it becomes the dominant force between uncharged conductors. In fact, at separations of 10 nm—about 100 times the typical size of an atom—the Casimir effect produces the equivalent of about 1 atmosphere of pressure (the precise value depending on surface geometry and other factors).In modern theoretical physics, the Casimir effect plays an important role in the chiral bag model of the nucleon; and in applied physics, it is significant in some aspects of emerging microtechnologies and nanotechnologies.Any medium supporting oscillations has an analogue of the Casimir effect. For example, beads on a string as well as plates submerged in noisy water or gas exhibit the Casimir force.".
- Casimir_effect thumbnail Casimir_plates.svg?width=300.
- Casimir_effect wikiPageExternalLink ap061217.html.
- Casimir_effect wikiPageExternalLink 0503100.
- Casimir_effect wikiPageExternalLink 0106045.
- Casimir_effect wikiPageExternalLink S0370-1573(01)00015-1.
- Casimir_effect wikiPageExternalLink 978-3-642-20288-9.
- Casimir_effect wikiPageExternalLink p5.
- Casimir_effect wikiPageExternalLink casimir.html.
- Casimir_effect wikiPageExternalLink index.html.
- Casimir_effect wikiPageExternalLink 9747.
- Casimir_effect wikiPageExternalLink p360_1.
- Casimir_effect wikiPageExternalLink default.htm.
- Casimir_effect wikiPageExternalLink casimir-bib.html.
- Casimir_effect wikiPageExternalLink PU00018547.pdf.
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- Casimir_effect wikiPageExternalLink event.asp?PageId=4&EventId=258.
- Casimir_effect wikiPageExternalLink newsfromnist_casimir-polder.htm.
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- Casimir_effect wikiPageID "7555".
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- Casimir_effect hasPhotoCollection Casimir_effect.
- Casimir_effect subject Category:Faster-than-light_travel.
- Casimir_effect subject Category:Force.
- Casimir_effect subject Category:Levitation.
- Casimir_effect subject Category:Physical_phenomena.
- Casimir_effect subject Category:Quantum_field_theory.
- Casimir_effect type NaturalPhenomenon111408559.
- Casimir_effect type Phenomenon100034213.
- Casimir_effect type PhysicalEntity100001930.
- Casimir_effect type PhysicalPhenomena.
- Casimir_effect type PhysicalPhenomenon111419404.
- Casimir_effect type Process100029677.
- Casimir_effect comment "In quantum field theory, the Casimir effect and the Casimir–Polder force are physical forces arising from a quantized field. They are named after the Dutch physicist Hendrik Casimir.The typical example is of two uncharged metallic plates in a vacuum, placed a few nanometers apart. In a classical description, the lack of an external field also means that there is no field between the plates, and no force would be measured between them.".
- Casimir_effect label "Casimir effect".
- Casimir_effect label "Casimir-Effekt".
- Casimir_effect label "Casimireffect".
- Casimir_effect label "Efecto Casimir".
- Casimir_effect label "Efeito Casimir".
- Casimir_effect label "Efekt Casimira".
- Casimir_effect label "Effet Casimir".
- Casimir_effect label "Effetto Casimir".
- Casimir_effect label "Эффект Казимира".
- Casimir_effect label "تأثير كازيمير".
- Casimir_effect label "カシミール効果".
- Casimir_effect label "卡西米爾效應".
- Casimir_effect sameAs Casimirův_jev.
- Casimir_effect sameAs Casimir-Effekt.
- Casimir_effect sameAs Efecto_Casimir.
- Casimir_effect sameAs Effet_Casimir.
- Casimir_effect sameAs Effetto_Casimir.
- Casimir_effect sameAs カシミール効果.
- Casimir_effect sameAs 카시미르_효과.
- Casimir_effect sameAs Casimireffect.
- Casimir_effect sameAs Efekt_Casimira.
- Casimir_effect sameAs Efeito_Casimir.
- Casimir_effect sameAs m.02423.
- Casimir_effect sameAs Q275393.
- Casimir_effect sameAs Q275393.
- Casimir_effect sameAs Casimir_effect.
- Casimir_effect wasDerivedFrom Casimir_effect?oldid=605260926.
- Casimir_effect depiction Casimir_plates.svg.
- Casimir_effect isPrimaryTopicOf Casimir_effect.