By Boling Guo

ISBN-10: 9812778756

ISBN-13: 9789812778758

ISBN-10: 9812778764

ISBN-13: 9789812778765

It is a complete advent to Landau Lifshitz equations and Landau Lifshitz Maxwell equations, starting with the paintings through Yulin Zhou and Boling Guo within the early Eighties and together with many of the paintings performed via this chinese language team led through Zhou and Guo on the grounds that. The e-book makes a speciality of facets corresponding to the lifestyles of susceptible recommendations in multi dimensions, life and strong point of soft strategies in a single measurement, kin with harmonic map warmth flows, partial regularity and very long time behaviors.

The booklet is a beneficial reference publication in the event you have an interest in partial differential equations, geometric research and mathematical physics. it may possibly even be used as a sophisticated textbook by means of graduate scholars in those fields.

**Contents: Spin Waves and Equations of Ferromagnetic Spin Chain; Integrability of Heisenberg Chain; One-Dimensional Landau Lifshitz Equations; Landau Lifshitz Equations and Harmonic Maps; Landau Lifshitz Maxwell Equations; very long time habit of suggestions to the process of Ferromagnetic Spin Chain.
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It is a finished advent to Landau Lifshitz equations and Landau Lifshitz Maxwell equations, starting with the paintings by means of Yulin Zhou and Boling Guo within the early Nineteen Eighties and together with lots of the paintings performed by means of this chinese language workforce led through Zhou and Guo because. The booklet makes a speciality of points comparable to the lifestyles of vulnerable strategies in multi dimensions, life and strong point of soft strategies in a single size, family members with harmonic map warmth flows, partial regularity and very long time behaviors.

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Hence ε(x, t) = q2 , 2t j(x, t) = q2x x = ε(x, t). 4 39 Equivalence to Nonlinear Schr¨ odinger Equations 1. 1) as e1t = e1 × e . 38) −2 τ (x, t) = k e1 · (e1 × e1 ). 39) Now establish an orthogonal three-side-body e1 , e2 , e3 where e2 lies along the direction of e1 , e3 = e1 × e2 . 40) e3 = −τ e3 . 41) e3 , j = 1, 2, 3. 42) These conditions lead to the following equations of k and τ : kt = −2kx τ − kτx , τt = kxx − τ2 k + kk . 44) where ε = 21 | ∂∂xS |2 , j(x, t) = S · (Sx × Sxx ) and 1 ε(x, t) = x2 , 2 j(x, t) = k 2 τ.

18), we have Z(Z + y 2 ) = 0. 22) Z + y 2 = 2(α − ΩZ)(1 − Z 2 ). 23) Z − cy − 3ΩZ 2 + 2αZ + Ω = 0. 22). 25) 1 α = Ω = c2 . 26) dϕ c = . 20) that Landau–Lifshitz Equations 38 Then we have by integrating this equation that 1 1 ϕ = tan−1 tanh cu + cu. 3 j(u) = cε(u). e. 1 η = xt− 2 . 31) η S = −2S × S . 33) with |S (η)| = q. 32) j(x, t) = η |S (η)|2 . 32) that S · S = 0, we get |S (η)|2 = q 2 = constant. Hence ε(x, t) = q2 , 2t j(x, t) = q2x x = ε(x, t). 4 39 Equivalence to Nonlinear Schr¨ odinger Equations 1.

In order to derive the resonance conditions, we take Laurant expansion aj ϕj−1 , a= j bj ϕj−1 , b= ϕj−1 . 16), we get the matrix equation for the coefficients of the terms with lower order as (j 2 − 3j)ϕ2r 0 2a0 aj 2 2 0 (j − 3j)ϕr 2b0 bj = 0. 19) that the resonance conditions are j = −1, 0, 2, 3, 4. 22) Landau–Lifshitz Equations 48 Obviously, resonance j = −1 implies the arbitrariness of the singular flow ϕ(x, t) = 0, resonance j = 0 indicates the arbitrariness of the functions a0 or b0 .

### Landau-Lifshitz equations by Boling Guo

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