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rdfs:label
カイラリティ Chiralität (Physik) 手徵性 Quiralidad (física) Хиральность (физика) Kiralitate (fisika) Chiralità (fisica) Chirality (physics) Quiralidade (física)
rdfs:comment
Em física, um fenômeno quiral é aquele que não é idêntico a sua imagem no espelho (veja o artigo sobre quiralidade química). A rotação de uma partícula pode ser usada para definir uma quiralidade, ou , para que partículas que, no caso de uma partícula sem massa, é a mesma quiralidade. Uma transformação de simetria entre as duas é chamado de paridade. Invariância sob paridade por um férmion de Dirac é chamado simetria quiral. Kiralitatea fisikan gauzaki batek ispiluan duen irudiarekiko berdintasunik ez izatean datzan ezaugarri geometrikoa da. Eskuineko eskua eta ezkerreko eskua objektu kiralak dira, bata bestearen aurkako baita. Ezkerreko eskua eskuineko eskuaren irudia da planu bati dagokionez, baina bata bestearengandik desberdinak dira eta ezin dira bata bestearen gainean elkar jarri. Хира́льность (киральность) — свойство физики элементарных частиц, состоящее в различии правого и левого, и указывающее на то, что Вселенная является несимметричной относительно замены правого на левое и левого на правое. Обычно говорят про хиральность молекул и хиральность элементарных частиц. La quiralidad en física, y en especial en física de partículas, es el fenómeno que describe el comportamiento de las partículas en un sistema de referencia dextrógiro, también llamado de mano-derecha, o uno levógiro o de mano-izquierda. El espín de las partículas puede ser utilizado para definir su helicidad que en el caso de ser partículas no masivas es la misma que la quiralidad. La transformación de simetría entre las dos se la llama paridad. La invarianza bajo paridad de un fermión de Dirac se llama simetría quiral. La chiralità è una proprietà che distingue i sistemi fisici in destrorsi e sinistrorsi: un sistema fisico possiede una chiralità se sotto una trasformazione di parità si trasforma nel sistema con la chiralità opposta. Le forze che agiscono su di un sistema fisico possono modificare o meno la chiralità; l'interazione che trasforma un sistema con chiralità definita in un altro con la stessa chiralità si dice . カイラリティ (英: chirality) は、ある現象とその鏡像が同一にはならないような性質である。掌性ともいう。数学におけるも参照のこと。粒子のカイラリティは、そのスピンによって定義することができる。2つのカイラリティの間の対称性変換はパリティ変換と呼ばれる。 1957年に呉健雄らによって行われた、コバルト60の原子核の弱い崩壊に対する実験は宇宙のパリティ対称性の破れを実証した。 Chiralität (Händigkeit, Kunstwort, abgeleitet von griechisch χειρ~, ch[e]ir~ - hand~), bezeichnet in der Physik ein abstraktes Konzept im Rahmen der relativistischen Quantenmechanik und der Quantenfeldtheorie. Die Chiralität eines Teilchens ist entscheidend bei Prozessen der schwachen Wechselwirkung, da W-Bosonen nur an Teilchen mit negativer (linkshändiger) Chiralität und an Antiteilchen mit positiver (rechtshändiger) Chiralität koppeln. A chiral phenomenon is one that is not identical to its mirror image (see the article on mathematical chirality). The spin of a particle may be used to define a handedness, or helicity, for that particle, which, in the case of a massless particle, is the same as chirality. A symmetry transformation between the two is called parity transformation. Invariance under parity transformation by a Dirac fermion is called chiral symmetry. 手徵性(chirality)也称手性,是物理学中的一个概念。以螺旋为例,定义其手性时,可使右手大拇指指向螺旋的轴向,其余四指握拳并据此比较螺旋的旋转的前进方向。如果螺旋是顺着四指(由指根向指尖)趋向大拇指指尖的方向,则该螺旋称为右手性的;反之,则称为左手性的。 该方法可以更明白地表达成:顺螺旋的轴向观察,如果看到的螺旋是逆时针接近观察位置的,则为右手性的;反之为左手性的。 这个方法操作起来和电磁学中有关电流方向和感生磁场方向的安培定律的方式差不多,该定理的两种典型情况分别是: * 判断载流直导线中的电流方向与感生磁场方向的关系时,让右手大拇指指向电流方向,则其余四指的方向则为磁场方向。 * 判断载流螺线管里的电流方向与螺线管的感生磁场方向关系时,让右手四指由手掌向手指指向电流方向,则大拇指指向感生磁场的北极。 此外,(Fleming rule)还指出,闭合导线在进行切割磁力线的运动时,产生的感生电流的方向例子中,伸出右手,让右手手掌面对磁北极,大拇指指向某段导线的运动方向,则其余四指指向该段导线中产生的感生电流的方向。
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A chiral phenomenon is one that is not identical to its mirror image (see the article on mathematical chirality). The spin of a particle may be used to define a handedness, or helicity, for that particle, which, in the case of a massless particle, is the same as chirality. A symmetry transformation between the two is called parity transformation. Invariance under parity transformation by a Dirac fermion is called chiral symmetry. Kiralitatea fisikan gauzaki batek ispiluan duen irudiarekiko berdintasunik ez izatean datzan ezaugarri geometrikoa da. Eskuineko eskua eta ezkerreko eskua objektu kiralak dira, bata bestearen aurkako baita. Ezkerreko eskua eskuineko eskuaren irudia da planu bati dagokionez, baina bata bestearengandik desberdinak dira eta ezin dira bata bestearen gainean elkar jarri. La quiralidad en física, y en especial en física de partículas, es el fenómeno que describe el comportamiento de las partículas en un sistema de referencia dextrógiro, también llamado de mano-derecha, o uno levógiro o de mano-izquierda. El espín de las partículas puede ser utilizado para definir su helicidad que en el caso de ser partículas no masivas es la misma que la quiralidad. La transformación de simetría entre las dos se la llama paridad. La invarianza bajo paridad de un fermión de Dirac se llama simetría quiral. Un experimento sobre la desintegración débil de los núcleos de cobalto-60 realizado por Chien-Shiung Wu y sus colaboradores en 1957 demostró que la paridad no es una simetría del universo. La chiralità è una proprietà che distingue i sistemi fisici in destrorsi e sinistrorsi: un sistema fisico possiede una chiralità se sotto una trasformazione di parità si trasforma nel sistema con la chiralità opposta. Le forze che agiscono su di un sistema fisico possono modificare o meno la chiralità; l'interazione che trasforma un sistema con chiralità definita in un altro con la stessa chiralità si dice . Si può dimostrare che l'elicità di una particella di spin 1/2 tende alla sua chiralità nel limite di massa nulla, ovvero nel limite in cui l'energia della particella è molto maggiore della sua massa. Dal momento che gli esperimenti Super-Kamiokande e OPERA (assieme ad altri) hanno dimostrato che anche i neutrini hanno una massa diversa da zero, non si conoscono particelle di spin 1/2 a massa nulla, e quindi con chiralità assolutamente definita. D'altra parte nel modello standard i fermioni avrebbero tutti massa nulla grazie all'invarianza sotto parità, altrimenti detta simmetria chirale, necessaria alla coerenza della teoria. L'acquisizione di massa avverrebbe tramite rottura spontanea di simmetria dovuta al campo di Higgs, che conserva al contempo la simmetria di gauge del modello. La chiralità è strettamente legata alla parità: infatti in una teoria simmetrica sotto parità le componenti a chiralità positiva e negativa dei campi devono essere trattate allo stesso modo. Nel 1957, in un esperimento condotto da Chien-Shiung Wu è stato dimostrato che nei decadimenti deboli la parità viene violata, aprendo la strada alla delle interazioni deboli: mentre la forza elettromagnetica, la forza forte e quella gravitazionale si accoppiano ugualmente alle particelle con chiralità negativa e positiva (cioè a particelle sinistrorse e destrorse), l'interazione debole si accoppia esclusivamente alle particelle sinistrorse. 手徵性(chirality)也称手性,是物理学中的一个概念。以螺旋为例,定义其手性时,可使右手大拇指指向螺旋的轴向,其余四指握拳并据此比较螺旋的旋转的前进方向。如果螺旋是顺着四指(由指根向指尖)趋向大拇指指尖的方向,则该螺旋称为右手性的;反之,则称为左手性的。 该方法可以更明白地表达成:顺螺旋的轴向观察,如果看到的螺旋是逆时针接近观察位置的,则为右手性的;反之为左手性的。 这个方法操作起来和电磁学中有关电流方向和感生磁场方向的安培定律的方式差不多,该定理的两种典型情况分别是: * 判断载流直导线中的电流方向与感生磁场方向的关系时,让右手大拇指指向电流方向,则其余四指的方向则为磁场方向。 * 判断载流螺线管里的电流方向与螺线管的感生磁场方向关系时,让右手四指由手掌向手指指向电流方向,则大拇指指向感生磁场的北极。 此外,(Fleming rule)还指出,闭合导线在进行切割磁力线的运动时,产生的感生电流的方向例子中,伸出右手,让右手手掌面对磁北极,大拇指指向某段导线的运动方向,则其余四指指向该段导线中产生的感生电流的方向。 Em física, um fenômeno quiral é aquele que não é idêntico a sua imagem no espelho (veja o artigo sobre quiralidade química). A rotação de uma partícula pode ser usada para definir uma quiralidade, ou , para que partículas que, no caso de uma partícula sem massa, é a mesma quiralidade. Uma transformação de simetria entre as duas é chamado de paridade. Invariância sob paridade por um férmion de Dirac é chamado simetria quiral. Chiralität (Händigkeit, Kunstwort, abgeleitet von griechisch χειρ~, ch[e]ir~ - hand~), bezeichnet in der Physik ein abstraktes Konzept im Rahmen der relativistischen Quantenmechanik und der Quantenfeldtheorie. Die Chiralität eines Teilchens ist entscheidend bei Prozessen der schwachen Wechselwirkung, da W-Bosonen nur an Teilchen mit negativer (linkshändiger) Chiralität und an Antiteilchen mit positiver (rechtshändiger) Chiralität koppeln. Die Chiralität ist zu unterscheiden von der Helizität. Die Chiralität physikalischer Größen lässt sich im Gegensatz zur Chiralität in der Chemie auch nicht durch eine Spiegelung am ebenen Spiegel veranschaulichen. Stattdessen beschreibt sie die Zerlegung von Dirac-Spinoren in orthogonale Zustände, die unter Paritätsoperationen ineinander übergehen. カイラリティ (英: chirality) は、ある現象とその鏡像が同一にはならないような性質である。掌性ともいう。数学におけるも参照のこと。粒子のカイラリティは、そのスピンによって定義することができる。2つのカイラリティの間の対称性変換はパリティ変換と呼ばれる。 1957年に呉健雄らによって行われた、コバルト60の原子核の弱い崩壊に対する実験は宇宙のパリティ対称性の破れを実証した。 Хира́льность (киральность) — свойство физики элементарных частиц, состоящее в различии правого и левого, и указывающее на то, что Вселенная является несимметричной относительно замены правого на левое и левого на правое. Обычно говорят про хиральность молекул и хиральность элементарных частиц.
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