On the geometric fixed-points of real topological cyclic homology

Abstract

We give a formula for the geometric fixed-points spectrum of the real topological cyclic homology of a bounded below ring spectrum, as an equaliser of two maps between tensor products of modules over the norm. We then use this formula to carry out computations in the fundamental examples of spherical group-rings, perfect ${\mathbb{F}}_p$-algebras, and $2$-torsion free rings with perfect modulo $2$ reduction. Our calculations agree with the normal L-theory spectrum in the cases where the latter is known, as conjectured by Nikolaus.

arXiv comment54 pages. Fixed an error in Theorem 4.8

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Cited by in corpus (5)

• Reflexive homology
• Real topological Hochschild homology via the norm and Real Witt vectors
• On the parametrized Tate construction
• A Weiss-Williams theorem for spaces of embeddings and the homotopy type of spaces of long knots
• An analogue of the Milnor conjecture for the de Rham-Witt complex in characteristic 2