The virtual Euler class conjecture for quasi-smooth derived schemes

Let Y\boldsymbol{Y} be a quasi-smooth derived scheme, write Y=t0(Y)Y=t_0(\boldsymbol{Y}), and let Y~=t0(T[1]Y)\widetilde{Y}=t_0(\mathbf{T}^*[-1]\boldsymbol{Y}). The class e(T[1]Y)H2vdimYBM(Y)e(\mathbf{T}^*[-1]\boldsymbol{Y})\in \mathrm{H}^{\mathrm{BM}}_{2\operatorname{vdim}\boldsymbol{Y}}(Y) is defined by the Thom isomorphism, and [Y]virH2vdimYBM(Y)[\boldsymbol{Y}]^{\mathrm{vir}}\in \mathrm{H}^{\mathrm{BM}}_{2\operatorname{vdim}\boldsymbol{Y}}(Y) denotes the virtual fundamental class constructed by Behrend--Fantechi. Virtual Euler class conjecture.

e(T[1]Y)=(1)vdimY(vdimY1)/2[Y]vir.e(\mathbf{T}^*[-1] \boldsymbol{Y}) = (-1)^{\operatorname{vdim} \boldsymbol{Y} \cdot (\operatorname{vdim} \boldsymbol{Y} - 1) /2}[\boldsymbol{Y}]^{\mathrm{vir}}.

This predicts that the Euler class arising from the Thom isomorphism agrees with the virtual fundamental class up to the stated sign. The source gives no general resolution; it notes that the conjecture is known when the restriction of the cotangent complex to YY is represented by a two-term complex of vector bundles, in particular when YY is quasi-projective.

Sources & referencesView supporting material

Primary source

Tasuki Kinjo, “Dimensional reduction in cohomological Donaldson-Thomas theory”, arXiv:2102.01568 (2021).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.