nLab
derived Morita equivalence

Contents

Idea

Derived Morita equivalence is a generalization of Morita equivalence to the โ€œderivedโ€ context (homotopy theory of dg-algebras). Just as two kk-algebras are Morita equivalent if and only if their categories of left modules are equivalent, the coarser equivalence relation of derived Morita equivalence holds whenever for two differential graded algebras their (bounded) derived categories of modules, along with their triangulated category structure, are equivalent.

The existence of a tilting complex is necessary and sufficient for an equivalence between the unbounded derived categories of two rings. A tilting complex is a special small generator of the derived category. It is a bounded complex TT of finitely generated projective RR-modules which generates the derived category ๐’Ÿ(R)\mathcal{D}(R) and whose graded ring of self maps ๐’Ÿ(R)(T,T) *\mathcal{D}(R)(T, T)_{\ast} is concentrated in dimension zero.

Examples

A derived Morita equivalence in the context of homological mirror symmetry appears in (Okada 09)

References

In the setting of dg-categories:

In the setting of stable (infinity,1)-categories (section 4):

For a treatment in terms of bicategories:

  • Niles Johnson, Morita Theory For Derived Categories: A Bicategorical Perspective (arXiv:0805.3673)

Last revised on March 18, 2015 at 11:44:44. See the history of this page for a list of all contributions to it.