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Register a new userComputation of the homotopy of the spectrum tmf
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Tilman Bauer
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This paper contains a complete computation of the homotopy ring of the spectrum of topological modular forms constructed by Hopkins and Miller. The computation is done away from 6, and at the (interesting) primes 2 and 3 separately, and in each of the latter two cases, a sequence of algebraic Bockstein spectral sequences is used to compute the E_2 term of the elliptic Adams-Novikov spectral sequence from the elliptic curve Hopf algebroid. In a further step, all the differentials in the latter spectral sequence are determined. The result of this computation is originally due to Hopkins and Mahowald (unpublished).
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We compute the homotopy groups of the {eta}-periodic motivic sphere spectrum over a finite-dimensional field k with characteristic not 2 and in which -1 a sum of four squares. We also study the general characteristic 0 case and show that the {eta}-periodic slice spectral sequence over Q determines the {eta}-periodic slice spectral sequence over all extensions of Q. This leads to a speculation on the role of a connective Witt-theoretic J-spectrum in {eta}-periodic motivic homotopy theory.
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