Real Floer realization conjecture for connected sums and doubly periodic knots

Let KK be any knot in S3S^3, let KrK^r denote its reverse, and let \fra\fra denote auxiliary data. Let \fro\fro denote the auxiliary data associated with the doubly periodic knot K#KK\#K. The notation AA is the ordinary Alexander grading and ARA^R is the real Alexander grading.

Real Floer realization conjecture. There is an isomorphism of bigraded groups

HFK^(K)HFKR^(K#τKr,\fra),\widehat{\operatorname{HFK}}(K)\cong\widehat{\operatorname{HFKR}}(K\#\tau K^r,\fra),

under the correspondence AR=12AA^R=\frac{1}{2}A, for any choice of auxiliary data. Moreover,

rankHFK^(K)=rankHFKR^(K#K,\fro),\operatorname{rank}\widehat{\operatorname{HFK}}(K)=\operatorname{rank}\widehat{\operatorname{HFKR}}(K\#K,\fro),

for either choice of orientation.

The claim is motivated by computations for K=31,41,51,K=3_1,4_1,5_1, and 525_2. The supplied text reports these examples but gives no general proof or resolution.

Sources & referencesView supporting material

Primary source

Yonghan Xiao, “Real link Floer homology”, arXiv:2604.21240 (2026).

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