Motivic Homotopy Theory and Refined Enumerative Geometry

2020 ◽  
2008 ◽  
Vol 341 (3) ◽  
pp. 651-675 ◽  
Author(s):  
Oliver Röndigs ◽  
Paul Arne Østvær

Author(s):  
DAVID GEPNER ◽  
JEREMIAH HELLER

Abstract We establish, in the setting of equivariant motivic homotopy theory for a finite group, a version of tom Dieck’s splitting theorem for the fixed points of a suspension spectrum. Along the way we establish structural results and constructions for equivariant motivic homotopy theory of independent interest. This includes geometric fixed-point functors and the motivic Adams isomorphism.


2018 ◽  
Vol 22 (4) ◽  
pp. 2187-2218 ◽  
Author(s):  
Jeremiah Heller ◽  
Kyle Ormsby

2017 ◽  
Vol 311 ◽  
pp. 91-189 ◽  
Author(s):  
Mikhail Bondarko ◽  
Frédéric Déglise

Author(s):  
Tom Bachmann

Abstract We establish a kind of ‘degree $0$ Freudenthal ${\mathbb {G}_m}$ -suspension theorem’ in motivic homotopy theory. From this we deduce results about the conservativity of the $\mathbb P^1$ -stabilization functor. In order to establish these results, we show how to compute certain pullbacks in the cohomology of a strictly homotopy-invariant sheaf in terms of the Rost–Schmid complex. This establishes the main conjecture of [2], which easily implies the aforementioned results.


2011 ◽  
Vol 350 (3) ◽  
pp. 755-756
Author(s):  
Oliver Röndigs ◽  
Paul Arne Østvær

Author(s):  
Daniel C. Isaksen ◽  
Armira Shkembi

AbstractWe make some computations in stable motivic homotopy theory over Spec ℂ, completed at 2. Using homotopy fixed points and the algebraic K-theory spectrum, we construct over ℂ a motivic analogue of the real K-theory spectrum KO. We also establish a theory of motivic connective covers over ℂ to obtain a motivic version of ko. We establish an Adams spectral sequence for computing motivic ko-homology. The E2-term of this spectral sequence involves Ext groups over the subalgebra A(1) of the motivic Steenrod algebra. We make several explicit computations of these E2-terms in interesting special cases.


Sign in / Sign up

Export Citation Format

Share Document