By Arkady L Kholodenko

Even if touch geometry and topology is in short mentioned in V I Arnol'd's booklet "Mathematical equipment of Classical Mechanics "(Springer-Verlag, 1989, 2d edition), it nonetheless is still a site of study in natural arithmetic, e.g. see the hot monograph via H Geiges "An creation to touch Topology" (Cambridge U Press, 2008). a few makes an attempt to take advantage of touch geometry in physics have been made within the monograph "Contact Geometry and Nonlinear Differential Equations" (Cambridge U Press, 2007). regrettably, even the superb variety of this monograph isn't really adequate to draw the eye of the physics neighborhood to this kind of difficulties. This e-book is the 1st critical try to swap the present established order. In it we reveal that, in reality, all branches of theoretical physics should be rewritten within the language of touch geometry and topology: from mechanics, thermodynamics and electrodynamics to optics, gauge fields and gravity; from physics of liquid crystals to quantum mechanics and quantum desktops, and so on. The booklet is written within the sort of recognized Landau-Lifshitz (L-L) multivolume path in theoretical physics. which means its readers are anticipated to have sturdy heritage in theoretical physics (at least on the point of the L-L course). No earlier wisdom of specialised arithmetic is needed. All wanted new arithmetic is given within the context of mentioned actual difficulties. As within the L-L direction a few problems/exercises are formulated alongside the way in which and, back as within the L-L path, those are consistently supplemented by way of both suggestions or through tricks (with particular references). not like the L-L path, even though, a few definitions, theorems, and feedback also are provided. this can be performed with the aim of stimulating the curiosity of our readers in deeper examine of themes mentioned within the textual content.

Readership: Researchers and execs in utilized arithmetic and theoretical physics.

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**Extra info for Applications of Contact Geometry and Topology in Physics**

**Example text**

With one of such surfaces. In this coordinate system we write for the combination v · ∇ = ∂χ and, accordingly, w · ∇ = ∂ψ . Furthermore, in such coordinates uses of Eulerian coordinate vector r(χ, ψ, ω) leads to relations: ∂χ r = v and ∂ψ r = w. Such introduced vectors are tangent to the χ and ψ coordinate lines on the Maxwellian surfaces labelled by ω. To proceed, requires us to rewrite Eqs. 2b) in terms of coordinates of the adapted coordinate system. In particular, Eqs. 2a) acquire the following form: div v = div rχ = |rχ , rψ , rω |χ = 0, |rχ , rψ , rω | div rψ = |rχ , rψ , rω |ψ = 0.

7) makes it zero as well. Hence, under conditions just described, the G-L functional indeed reaches its absolute minimum. Now we are ready to look at these results from the point of view of force-free ﬁelds. Since for the superconducting current js = ens vs and since vs = 2m ∇Φ, Eq. 10) P = ps − A = 0. c That is the generalized momentum of the Cooper pair in the ground state is zero. But we can now also deﬁne the generalized velocity as V = vs − 1 A. Since we have to require it to be also zero, we obtain, vs = 1c A, to c be compared with the superconducting option in the relation v = ±κA which was postulated prior to Eq.

Under such an assumption Eq. 3a) so that Π(ω) = − ω d˜ ω Ω(˜ ω). 3a) is the famous Lund–Regge equation introduced by Lund and Regge in [29]. To analyze this equation further we would like to discuss physical arguments which lead Lund and Regge to the discovery of their equation. [29] can be considered as substantial reﬁnement of earlier work by Nielsen and Olesen [30]. These authors found a remarkable relationship between the dynamics of the Nambu–Goto string model and that of the vortices in superﬂuid 4 He and in superconductors.