The tropical Lagrangian torus conjecture for Fano hypersurfaces

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Let XanX^n_a be the degree-aa Fano hypersurface in projective space with a=n−1a=n-1, and let Ln⊂XanL_n\subset X^n_a be the monotone Lagrangian torus obtained as the torus fibre over the centroid of the unique compact cell of the corresponding tropical manifold. Write w(Ln)w(L_n) for its disk potential value, and let C ⁣ℓn−2C\!\ell_{n-2} denote the Clifford algebra on n−2n-2 generators.

Tropical Lagrangian torus conjecture. The torus satisfies

w(Ln)=aa−a!,w(L_n)=a^a-a!,

so that LnL_n lies in the unique small component of the monotone Fukaya category, and

HF∗(Ln,Ln)≅C ⁣ℓn−2.HF^*(L_n,L_n)\cong C\!\ell_{n-2}.

This proposes an explicit monotone Lagrangian representative of the small Fukaya-category component in the Fano index-one case. The statement is presented as a speculation about a possible construction, and no resolution is supplied in the source.

References

Primary source

Nick Sheridan, “On the Fukaya category of a Fano hypersurface in projective space”, arXiv:1306.4143 (2016).

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