New PDF release: Fiber bundle techniques in gauge theories

By Wolfgang Drechsler

ISBN-10: 0387083502

ISBN-13: 9780387083506

Fiber package deal suggestions in gauge theories (Lecture notes in physics)

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46) l = 1, 2, . . , S . Beweis q˙ j = l ∂L = ∂q¯l ∂L = ∂q¯˙l ⇒ d ∂L = dt ∂q¯˙l j j d ∂L ∂L − = dt ∂q¯˙l ∂q¯ l ∂L ∂qj ∂L ∂q˙ j + ∂qj ∂q¯ l ∂q˙ j ∂q¯l ∂L ∂q˙ j = ∂q˙ j ∂q¯˙l j , ∂L ∂qj ∂q˙ j ∂q¯l j d ∂L dt ∂q˙ j ∂qj ∂L + ∂q¯l ∂q˙ j j d ∂L dt ∂q˙ j ∂qj ∂L ∂q˙ j + ∂q¯l ∂q˙ j ∂q¯l = ⇒ ∂qj ˙ ∂qj ∂q˙ j ∂qj q¯ l + = , ⇒ ∂q¯l ∂t ∂q¯˙l ∂q¯l j ∂L d ∂L − dt ∂q˙ j ∂qj d ∂qj dt ∂q¯ l ∂qj =0. 2 Das d’Alembert’sche Prinzip 21 Für den Begriff der Forminvarianz ist eigentlich nicht entscheidend, dass L aus L schlicht durch Einsetzen der Transformationsformeln hervorgeht.

Die Anwendungsbeispiele des nächsten Abschnitts sollen mit dem abstrakten Formalismus vertraut machen. 6 Anwendungen der Methode der Lagrange’schen Multiplikatoren Wir diskutieren drei einfache physikalische Probleme. 1) Atwood’sche Fallmaschine Als eigentlich holonomes System haben wir die Fallmaschine bereits als Anwendungsbeispiel 1) in Abschn. 2 diskutiert. Sie dient hier der Illustration der Methode. 2 Das d’Alembert’sche Prinzip 41 x1 x2 m1 m2 Abb. 20. Atwood’sche Fallmaschine Von den fünf Zwangsbedingungen y1 = y2 = z1 = z2 = 0 , x1 + x2 − l = 0 verwenden wir nur die ersten vier zur Verringerung der Koordinatenzahl: j=6−4=2.

36) ableiten und lösen. 6. Rücktransformation auf „anschauliche“ Koordinaten. Wir wollen dieses Verfahren an einigen Anwendungsbeispielen üben. 1) Atwood’sche Fallmaschine Es handelt sich um ein konservatives System mit fünf holonom-skleronomen Zwangsbedingungen: x1 + x2 = l = const , y1 = y2 = z1 = z2 = 0 . Es bleiben also S=6−5=1 x1 Z1 x2 m1 Z2 m2 Abb. 15. Atwood’sche Fallmaschine 22 1. Lagrange-Mechanik Freiheitsgrade. Eine passende generalisierte Koordinate wäre dann: q = x1 (⇒ x2 = l − q) .

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Fiber bundle techniques in gauge theories by Wolfgang Drechsler


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