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Zeros and logarithmic asymptotics of Sobolev orthogonal polynomials for exponential weights

✍ Scribed by C. Díaz Mendoza; R. Orive; H. Pijeira Cabrera

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
502 KB
Volume
233
Category
Article
ISSN
0377-0427

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✦ Synopsis

We obtain the (contracted) weak zero asymptotics for orthogonal polynomials with respect to Sobolev inner products with exponential weights in the real semiaxis, of the form

x γ e -ϕ(x) , with γ > 0, which include as particular cases the counterparts of the so-called Freud (i.e., when ϕ has a polynomial growth at infinity) and Erdös (when ϕ grows faster than any polynomial at infinity) weights. In addition, the boundness of the distance of the zeros of these Sobolev orthogonal polynomials to the convex hull of the support and, as a consequence, a result on logarithmic asymptotics are derived.

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