This paper is on the connecting homomorphism in the long exact homotopy sequence of the evaluation fibration evp0 :C(P, K) K →K, whereC(P, K) K is the gauge group of a continuous principalK-bundle. We show that in the case of a bundle over a sphere or a orientable surface the connecting homomorphism is given in terms of the Samelson product. As applications we get an explicit formula for π2(C(P k ,K) K ), whereP k denotes the principal S3-bundle over S4 of Chern numberk and derive explicit formulae for the rational homotopy groups π n (C(P,K) K )⊗ℚ.
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机译:本文探讨了评价纤维ev p0 sub>的长精确同伦序列中的连接同态:C(P,K) K sup>→K,其中C(P,K) K sup>是连续主体K束的量表组。我们表明,在球体或可定向表面上的束中,连接同态是根据Samelson乘积给出的。在应用程序中,我们得到π 2 sub>(C(P k sub>,K) K sup>)的显式公式,其中P k sub >表示Chern数k的S 4 sup>上的主S 3 sup>-束,并导出有理同伦群π n sub>(C(P ,K) K sup>)⊗ℚ。
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