Fuchsian Reduction: Applications to Geometry, Cosmology and by Satyanad Kichenassamy

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By Satyanad Kichenassamy

Fuchsian relief is a technique for representing suggestions of nonlinear PDEs close to singularities. The approach has a number of purposes together with soliton thought, Einstein's equations and cosmology, stellar versions, laser cave in, conformal geometry and combustion. constructed within the Nineties for semilinear wave equations, Fuchsian aid learn has grown in line with these difficulties in natural and utilized arithmetic the place numerical computations fail.

This paintings unfolds systematically in 4 elements, interweaving conception and functions. The case reviews tested partially III illustrate the impression of relief innovations, and will function prototypes for destiny new purposes. within the comparable spirit, such a lot chapters contain an issue part. historical past effects and suggestions to chose difficulties shut the volume.

This e-book can be utilized as a textual content in graduate classes in natural or utilized research, or as a source for researchers operating with singularities in geometry and mathematical physics.

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Extra info for Fuchsian Reduction: Applications to Geometry, Cosmology and Mathematical Physics

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2. 8). 3. 7) be attained for two values of A, the corresponding monomials in F balancing each other. 3 First reduction We now perform the first reduction, with ε = 1 for simplicity; this creates some complication if 1 is a resonance, but avoids having to introduce new variables in the expansion. We further require that the second most singular terms also not involve space derivatives. 4. A still more general reduction would be obtained by taking t1/p as expansion variable, where p is a large integer.

We are interested in solutions that blow up on Σ defined by t = ψ(x); we seek u ∼ (t − ψ(x))−p/q v0 (x) for integers p and q as below. Four assumptions are now described and motivated. 1. Ensure that the blowup surface Σ is noncharacteristic: ⎞ ⎛ aj0 ∂j ψ ⎠ is invertible. 19) j 2. Require power growth for the nonlinearity b(u): assume that there are integers p and q, with q > 0, such that τ p+q b(τ −p ξ) is analytic in τ ∈ C and ξ ∈ Cm , near τ = 0, ξ = 0. We write τ p+q b(τ −p ξ) = c(τ, ξ) := cj (ξ)τ j .

1) The statement is clear if g = 0. Let us therefore assume g > 0. Let s(t) = v(t, t ln t, . . ) and assume k = 1. We have, since N − g = M on polynomials of degree g, t ds − gs = (M v)(t, t ln t, . . ) = u(t, t ln t, . . ) = 0. dt Since s(0) = 0, s ≡ ctg , so u − ctg0 is inessential. This settles the case k = 1. The other cases, as well as the converse, are proved similarly. (2) The statement follows from a general property of representations of sl(2): the irreducible representations contained in the present one act on a chain (vk , vk−2 , .

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