Relative symplectic cohomology and Maurer–Cartan deformation conjecture

Let MM be the positively monotone symplectic manifold and DD the normal-crossings divisor considered in the paper, let X=MDX=M\setminus D, and let L\mathbb{L} be the skeleton of XX. Let RR be the coefficient ring, \bk\bk the ground field, and β\beta the Maurer–Cartan element used to deform symplectic cohomology. Write SHM(L;R)SH^*_M(\mathbb{L};R) for relative symplectic cohomology.

Relative symplectic cohomology conjecture. There is an isomorphism of graded RR-modules

SHM(L;R)H(SC(X;\bk)\wotimes\bkR,β1).SH^*_M(\mathbb{L};R) \cong H^*\left(SC^*(X;\bk) \wotimes_\bk R,\ell^1_{\beta}\right).

This generalizes the theorem proved under Hypothesis A, namely the condition that all divisor weights satisfy λj2\lambda_j\leq 2. It is known in the cases covered by that theorem and is conjectured more generally, including examples where both sides vanish and the case of M=CP1×CP1M=\mathbb{CP}^1\times\mathbb{CP}^1 with DD a (1,1)(1,1) hypersurface.

Sources & referencesView supporting material

Primary source

Matthew Strom Borman, Mohamed El Alami and Nick Sheridan, “Maurer–Cartan elements in symplectic cohomology from compactifications”, arXiv:2408.09221 (2025).

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