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On the algebraic cobordism spectra $\mathbf{MSL}$ and $\mathbf{MSp}$
I. Panina,
C. Walterb a St.Petersburg Department of Steklov Institute of Mathematics, St.Petersburg, Russia
b Laboratoire J.-A. Dieudonné (UMR 6621 du CNRS) Département de mathématiques Université de Nice – Sophia Antipolis 06108 Nice Cedex 02, France
Аннотация:
Algebraic cobordism spectra
$\mathbf{MSL}$ and
$\mathbf{MSp}$ are constructed. They are commutative monoids in the category of symmetric
$T^{\wedge 2}$-spectra. The spectrum
$\mathbf{MSp}$ comes with a natural symplectic orientation given either by a tautological Thom class $\mathrm{th}^{\mathbf{MSp}} \in \mathbf{MSp}^{4,2}(\mathbf{MSp}_2)$, or a tautological Borel class $b_{1}^{\mathbf{MSp}} \in \mathbf{MSp}^{4,2}(HP^{\infty})$, or any of six other equivalent structures. For a commutative monoid
$E$ in the category
${SH}(S)$, it is proved that the assignment $\varphi \mapsto \varphi(\mathrm{th}^{\mathbf{MSp}})$ identifies the set of homomorphisms of monoids
$\varphi\colon \mathbf{MSp} \to E$ in the motivic stable homotopy category
$SH(S)$ with the set of tautological Thom elements of symplectic orientations of
$E$. A weaker universality result is obtained for
$\mathbf{MSL}$ and special linear orientations. The universality of
$\mathbf{MSp}$ has been used by the authors to prove a Conner–Floyed type theorem. The weak universality of
$\mathbf{MSL}$ has been used by A. Ananyevskiy to prove another version of the Conner–Floyed type theorem.
Ключевые слова:
$\mathbf{Aff}^{1}$-homotopy theory, Thom classes, universality theorems. Поступила в редакцию: 26.11.2021
Язык публикации: английский