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arXiv · 1510.01283

The eta-inverted R-motivic sphere

Bertrand J. Guillou·Daniel C. Isaksen
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Abstract

We use an Adams spectral sequence to calculate the R-motivic stable homotopy groups after inverting eta. The first step is to apply a Bockstein spectral sequence in order to obtain h_1-inverted R-motivic Ext groups, which serve as the input to the eta-inverted R-motivic Adams spectral sequence. The second step is to analyze Adams differentials. The final answer is that the Milnor-Witt (4k-1)-stem has order 2^{u+1}, where u is the 2-adic valuation of 4k. This answer is reminiscent of the classical image of J. We also explore some of the Toda bracket structure of the eta-inverted R-motivic stable homotopy groups.

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Bertrand J. Guillou, Daniel C. Isaksen. 2015-10-29. The eta-inverted R-motivic sphere. https://doi.org/10.2140/agt.2016.16.3005

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